Series flow concentrated regrinding flotation beneficiation method for copper oxide ore beneficiation and metallurgy products

Abstract

A series flow concentrated regrinding flotation beneficiation method for copper oxide ore beneficiation and metallurgy products comprises the steps that copper oxide ore is divided into low-oxidation-rate copper oxide ore, medium-oxidation-rate copper oxide ore and high-oxidation-rate copper oxide ore according to the oxidation rate, and ore grinding and copper sulfide flotation are conducted on the copper oxide ore, the medium-oxidation-rate copper oxide ore and the high-oxidation-rate copper oxide ore respectively; wherein concentrate obtained through copper sulfide scavenging of the low-oxidation-rate copper oxide ore, the medium-oxidation-rate copper oxide ore and the high-oxidation-rate copper oxide ore and tailings obtained through copper sulfide concentration are fed into an ore grinding procedure of the high-oxidation-rate copper oxide ore. According to the method, the ore recovery rate is effectively increased, the treatment procedure is simplified, the obtained copper sulfide concentrate has the higher grade and the lower yield, the follow-up treatment difficulty of the copper sulfide concentrate is reduced, and economic benefits are improved.

Description

Technical Field

[0001] The present invention relates to a mineral processing method, and particularly to a mineral processing method for copper oxide ore. Background Art

[0002] Copper ores can be divided into sulfide copper ores (oxidation rate less than 10%), copper oxide ores (oxidation rate greater than 30%), and mixed ores (oxidation rate between 10% and 30%) according to different oxidation rates (oxidation rate = copper oxide content ÷ total copper content × 100%). Among the copper oxide ores currently produced in the Democratic Republic of the Congo, the oxidation rate is between 30% and 100%, with a large difference. Copper oxide ores with different oxidation rates have different mineral processing and smelting processes: generally, they are further subdivided into "low oxidation rate copper oxide ores" with an oxidation rate of 30% - 50%, "medium oxidation rate copper oxide ores" with an oxidation rate of 50% - 70%, and "high oxidation rate copper oxide ores" with an oxidation rate greater than 70% for treatment.

[0003] The general mineral processing process for "low oxidation rate copper oxide ores" is that after the raw ore is ground, a "sulfur-first then oxygen" flotation process of first selecting sulfide copper and then selecting copper oxide from the sulfur flotation tailings is carried out to obtain sulfide copper concentrate and copper oxide concentrate. After the sulfide copper concentrate is roasted, the roasted ore is subjected to sulfuric acid leaching, and the copper oxide concentrate is directly subjected to sulfuric acid leaching. The general mineral processing process for "medium oxidation rate copper oxide ores" is the same as that for low oxidation rate copper oxide ores. The main difference is that due to the higher oxidation rate of the raw ore and the higher content of copper oxide ore, during the copper oxide flotation process, the dosage of the sulfiding agent (generally sodium hydrosulfide or sodium sulfide) required for the sulfiding-xanthate flotation method increases significantly. At the same time, due to the increase in the slime content of the raw ore, a large amount of collector is consumed by the slime, resulting in a significant increase in the collector dosage. The general mineral processing process for "high oxidation rate copper oxide ores" is to select sulfide copper after the raw ore is ground to obtain sulfide copper concentrate. After the sulfide copper concentrate is roasted, the roasted ore is subjected to sulfuric acid leaching, and the tailings from the selection of sulfide copper are directly subjected to sulfuric acid leaching.

[0004] The above-mentioned grinding, flotation and leaching process for "high oxidation rate copper oxide ores" is applicable to ores with a low content of carbonate minerals in the raw ore; the mineral processing and smelting processes for "low oxidation rate copper oxide ores" and "medium oxidation rate copper oxide ores" are applicable to ores with a high content of carbonate minerals in the raw ore. For ores from the same source, and the high, medium, and low oxidation rate ores further subdivided according to the oxidation rate from the same source, their raw ore carbonate mineral contents are close. When using the general mineral processing process, there is always a part of the process that is not applicable, resulting in a reduction in the overall recovery rate and poor economic benefits. The copper recovery rate of the existing process also needs to be further improved. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned defects existing in the prior art and provide a mineral processing and smelting product cross-flow centralized re-grinding flotation mineral processing method for copper oxide ore that can improve the copper recovery rate.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows: A method for beneficiating oxidized copper ore by series-flow concentration regrinding and flotation. The copper grade of the raw ore is below 5 wt%. According to the oxidation rate, the oxidized copper ore is divided into: low-oxidation-rate oxidized copper ore with an oxidation rate below 50 wt%, medium-oxidation-rate oxidized copper ore with an oxidation rate of 50 wt% to 75 wt%, and high-oxidation-rate oxidized copper ore with an oxidation rate above 75 wt%.

[0007] After grinding the low-oxidation-rate oxidized copper ore, rough selection of copper sulfide is carried out. The tailings obtained from the rough selection are subjected to scavenging of copper sulfide, and the concentrate obtained from the rough selection is subjected to cleaning of copper sulfide; The concentrate obtained from the scavenging of copper sulfide and the tailings obtained from the cleaning of copper sulfide are sent to the grinding process of the high-oxidation-rate oxidized copper ore; The concentrate obtained from the cleaning of copper sulfide is the copper sulfide concentrate; The low-oxidation-rate oxidized copper ore is ground to a particle size finer than 200 mesh accounting for 65 wt% to 75 wt%.

[0008] After grinding the medium-oxidation-rate oxidized copper ore, rough selection of copper sulfide is carried out. The tailings obtained from the rough selection are subjected to scavenging of copper sulfide, and the concentrate obtained from the rough selection is subjected to cleaning of copper sulfide; The concentrate obtained from the scavenging of copper sulfide and the tailings obtained from the cleaning of copper sulfide are sent to the grinding process of the high-oxidation-rate oxidized copper ore; The concentrate obtained from the cleaning of copper sulfide is the copper sulfide concentrate; The medium-oxidation-rate oxidized copper ore is ground to a particle size finer than 200 mesh accounting for 65 wt% to 75 wt%.

[0009] After grinding the high-oxidation-rate oxidized copper ore, rough selection of copper sulfide is carried out. The tailings obtained from the rough selection are subjected to scavenging of copper sulfide, and the concentrate obtained from the rough selection is subjected to cleaning of copper sulfide; The concentrate obtained from the scavenging of copper sulfide and the tailings obtained from the cleaning of copper sulfide are returned to the grinding process of the high-oxidation-rate oxidized copper ore; The concentrate obtained from the cleaning of copper sulfide is the copper sulfide concentrate; The high-oxidation-rate oxidized copper ore is ground to a particle size finer than 200 mesh accounting for more than 80 wt%.

[0010] Preferably, rough selection of oxidized copper is carried out on the scavenging tailings obtained from the scavenging of copper sulfide in the low-oxidation-rate oxidized copper ore. The concentrate obtained from the rough selection is high-grade oxidized copper concentrate, and the tailings obtained from the rough selection are subjected to scavenging of oxidized copper; The scavenging concentrate obtained from the scavenging of oxidized copper is low-grade oxidized copper concentrate; The scavenging tailings obtained from the scavenging of oxidized copper enter the tailings pond.

[0011] Preferably, rough selection of oxidized copper is carried out on the scavenging tailings obtained from the scavenging of copper sulfide in the medium-oxidation-rate oxidized copper ore. The concentrate obtained from the rough selection is high-grade oxidized copper concentrate, and the tailings obtained from the rough selection are subjected to scavenging of oxidized copper; The scavenging concentrate obtained from the scavenging of oxidized copper is low-grade oxidized copper concentrate; The scavenging tailings obtained from the scavenging of oxidized copper enter the tailings pond.

[0012] More preferably, the high-grade copper oxide concentrate is subjected to acid leaching, the obtained leaching residue is diluted with water, mixed and slurried with the concentrated low-grade copper oxide concentrate, and then fed into the grinding process of the high oxidation rate copper oxide ore.

[0013] Further preferably, the pH value of the ore pulp is adjusted to 1.5 - 2 by using concentrated sulfuric acid to leach the high-grade copper oxide concentrate; the conditions for acid leaching of the high-grade copper oxide concentrate are that the ore pulp concentration is 10wt% - 20wt%, and the leaching time is 6 - 9h.

[0014] Further preferably, the leaching residue obtained by acid leaching of the high-grade copper oxide concentrate is diluted to an ore pulp concentration of 60wt% - 70wt%.

[0015] Further preferably, the low-grade copper oxide concentrate is concentrated to an ore pulp concentration of 60wt% - 70wt%.

[0016] Further preferably, the mixed slurrying is: adjusting the pH value of the ore pulp to 6.5 - 7.5.

[0017] Preferably, the scavenging tailings obtained from the scavenging of copper sulfide in the high oxidation rate copper oxide ore are subjected to acid leaching, and the slag is subjected to countercurrent washing to obtain a leaching solution and a leaching residue.

[0018] Preferably, the copper sulfide concentration is carried out one or more than two times.

[0019] More preferably, when the copper sulfide concentration is more than two times, the middlings are sequentially returned.

[0020] Preferably, the copper sulfide scavenging is carried out one or more than two times.

[0021] More preferably, when the copper sulfide scavenging is more than two times, the middlings are sequentially returned.

[0022] Preferably, the copper oxide scavenging is carried out one or more than two times.

[0023] More preferably, when the copper oxide scavenging is more than two times, the concentrate obtained from each scavenging is used as the scavenging concentrate.

[0024] Preferably, the copper grade of the raw ore is 2wt% - 4wt%, and the oxidation rate is 30wt% - 95wt%.

[0025] Preferably, the low oxidation rate copper oxide ore is ground to particles finer than 200 mesh accounting for 68wt% - 71wt%. Preferably, the medium oxidation rate copper oxide ore is ground to particles finer than 200 mesh accounting for 68wt% - 73wt%.

[0026] Preferably, the high oxidation rate copper oxide ore is ground to particles finer than 200 mesh accounting for 85wt% - 90wt%. Preferably, the collector used for the low oxidation rate copper oxide ore dressing is butyl xanthate.

[0027] Preferably, the frother used in the beneficiation of low oxidation rate copper oxide is pine oil.

[0028] Preferably, the sulfiding agent used in the beneficiation of low oxidation rate copper oxide is sodium hydrosulfide.

[0029] Preferably, the collector used in the beneficiation of medium oxidation rate copper oxide is butyl xanthate.

[0030] Preferably, the frother used in the beneficiation of medium oxidation rate copper oxide is pine oil.

[0031] Preferably, the sulfiding agent used in the beneficiation of medium oxidation rate copper oxide is sodium hydrosulfide.

[0032] Preferably, the collector used in the beneficiation of high oxidation rate copper oxide is butyl xanthate.

[0033] Preferably, the frother used in the beneficiation of high oxidation rate copper oxide is pine oil.

[0034] Preferably, in the roughing of copper sulfide in the beneficiation of low oxidation rate copper oxide, the total dosage of the collector is 50 - 100 g / t. Preferably, in the roughing of copper sulfide in the beneficiation of low oxidation rate copper oxide, the total dosage of the frother is 10 - 20 g / t. Preferably, in the scavenging of copper sulfide in the beneficiation of low oxidation rate copper oxide, the total dosage of the collector is 20 - 50 g / t. Preferably, in the scavenging of copper sulfide in the beneficiation of low oxidation rate copper oxide, the total dosage of the frother is 5 - 10 g / t.

[0035] Preferably, in the roughing of copper sulfide in the beneficiation of medium oxidation rate copper oxide, the dosage of the collector each time is 30 - 60 g / t.

[0036] Preferably, in the roughing of copper sulfide in the beneficiation of medium oxidation rate copper oxide, the dosage of the frother each time is 10 - 15 g / t.

[0037] Preferably, in the scavenging of copper sulfide in the beneficiation of medium oxidation rate copper oxide, the dosage of the collector each time is 10 - 30 g / t.

[0038] Preferably, in the scavenging of copper sulfide in the beneficiation of medium oxidation rate copper oxide, the dosage of the frother each time is 5 - 10 g / t.

[0039] Preferably, in the roughing of copper sulfide in the beneficiation of high oxidation rate copper oxide, the dosage of the collector each time is 100 - 200 g / t.

[0040] Preferably, in the roughing of copper sulfide in the beneficiation of high oxidation rate copper oxide, the dosage of the frother each time is 10 - 20 g / t.

[0041] Preferably, in the scavenging of copper sulfide from the high oxidation rate copper oxide, the dosage of the collector each time is 50-100 g / t.

[0042] Preferably, in the scavenging of copper sulfide from the high oxidation rate copper oxide, the dosage of the frother each time is 5-10 g / t.

[0043] Preferably, in the rougher flotation of copper oxide from the low oxidation rate copper oxide, the total dosage of the sulfurizing agent is 600-1200 g / t.

[0044] Preferably, in the rougher flotation of copper oxide from the low oxidation rate copper oxide, the total dosage of the collector is 30-80 g / t.

[0045] Preferably, in the rougher flotation of copper oxide from the low oxidation rate copper oxide, the total dosage of the frother is 5-10 g / t.

[0046] Preferably, in the scavenging of copper oxide from the low oxidation rate copper oxide, the total dosage of the sulfurizing agent is 200-600 g / t.

[0047] Preferably, in the scavenging of copper oxide from the low oxidation rate copper oxide, the total dosage of the collector is 10-40 g / t.

[0048] Preferably, in the scavenging of copper oxide from the low oxidation rate copper oxide, the total dosage of the frother is 5-10 g / t.

[0049] [[ID=2,4]]Preferably, in the rougher flotation of copper oxide from the medium oxidation rate copper oxide, the dosage of the sulfurizing agent each time is 2000-3500 g / t.

[0050] Preferably, in the rougher flotation of copper oxide from the medium oxidation rate copper oxide, the dosage of the collector each time is 100-150 g / t.

[0051] Preferably, in the rougher flotation of copper oxide from the medium oxidation rate copper oxide, the dosage of the frother each time is 5-10 g / t.

[0052] Preferably, in the scavenging of copper oxide from the medium oxidation rate copper oxide, the dosage of the sulfurizing agent each time is 300-1500 g / t.

[0053] Preferably, in the scavenging of copper oxide from the medium oxidation rate copper oxide, the dosage of the collector each time is 20-70 g / t.

[0054] Preferably, in the scavenging of copper oxide from the medium oxidation rate copper oxide, the dosage of the frother each time is 0-5 g / t.

[0055] The present invention has the following beneficial effects: The method of the present invention effectively improves the ore recovery rate, simplifies the treatment process, the obtained copper sulfide concentrate has a higher grade and a lower yield, reduces the subsequent treatment difficulty of the copper sulfide concentrate, and improves the economic benefits.

[0056] In addition to the purposes, features and advantages described above, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. Description of the Drawings

[0057] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0058] Figure 1 is a process flow diagram of the method for beneficiation by series-flow centralized regrinding and flotation of copper oxide ore beneficiation products in Embodiment 1 of the present invention. Detailed Embodiments

[0059] In order to make the purposes, solutions and beneficial technologies of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and the drawings. It should be noted that the embodiments described in this specification are only for explaining the present invention and not for limiting the present invention.

[0060] For simplicity, only some numerical ranges are explicitly disclosed herein. However, any lower limit can be combined with any upper limit to form a range not explicitly recited; and any lower limit can be combined with other lower limits to form a range not explicitly recited, and similarly any upper limit can be combined with any other upper limit to form a range not explicitly recited. In addition, although not explicitly recited, each point or single value between the range endpoints is included in the range. Thus, each point or single value can be used as its own lower or upper limit and combined with any other point or single value or combined with other lower or upper limits to form a range not explicitly recited.

[0061] In the description herein, it should be noted that unless otherwise specified, "above" and "below" include the recited number, "multiple" in "one or more" means two or more, and "plural" in "one or more" means two or more.

[0062] The embodiments of the present invention provide a method for beneficiation by series-flow centralized regrinding and flotation of copper oxide ore beneficiation products. The original ore has a copper grade of less than 5 wt%. According to the oxidation rate, the copper oxide ore is divided into: low-oxidation-rate copper oxide ore with an oxidation rate of less than 50 wt%, medium-oxidation-rate copper oxide ore with an oxidation rate of 50 wt% to 75 wt%, and high-oxidation-rate copper oxide ore with an oxidation rate of more than 75 wt%.

[0063] After grinding the low oxidation rate copper oxide ore, rough selection of copper sulfide is carried out. The tailings obtained from the rough selection are subjected to scavenging of copper sulfide, and the concentrate obtained from the rough selection is subjected to cleaning of copper sulfide; the concentrate obtained from the scavenging of copper sulfide and the tailings obtained from the cleaning of copper sulfide are sent to the grinding process of the high oxidation rate copper oxide ore; the concentrate obtained from the cleaning of copper sulfide is the copper sulfide concentrate; the low oxidation rate copper oxide ore is ground to particles finer than 200 mesh accounting for 65wt% - 75wt%.

[0064] After grinding the medium oxidation rate copper oxide ore, rough selection of copper sulfide is carried out. The tailings obtained from the rough selection are subjected to scavenging of copper sulfide, and the concentrate obtained from the rough selection is subjected to cleaning of copper sulfide; the concentrate obtained from the scavenging of copper sulfide and the tailings obtained from the cleaning of copper sulfide are sent to the grinding process of the high oxidation rate copper oxide ore; the concentrate obtained from the cleaning of copper sulfide is the copper sulfide concentrate; the medium oxidation rate copper oxide ore is ground to particles finer than 200 mesh accounting for 65wt% - 75wt%.

[0065] After grinding the high oxidation rate copper oxide ore, rough selection of copper sulfide is carried out. The tailings obtained from the rough selection are subjected to scavenging of copper sulfide, and the concentrate obtained from the rough selection is subjected to cleaning of copper sulfide; the concentrate obtained from the scavenging of copper sulfide and the tailings obtained from the cleaning of copper sulfide are returned to the grinding process of the high oxidation rate copper oxide ore; the concentrate obtained from the cleaning of copper sulfide is the copper sulfide concentrate; the high oxidation rate copper oxide ore is ground to particles finer than 200 mesh accounting for more than 80wt%.

[0066] In the method of the present invention, the oxidation rate of the high oxidation rate copper oxide ore is 75wt% or more, which has a certain optimization effect on guiding the distribution of carbonate gangue minerals (flowing to the medium oxidation rate copper oxide ore).

[0067] The obtained copper sulfide concentrate can be further smelted in a conventional manner, such as acid leaching after roasting to make valuable elements enter the leaching solution.

[0068] The copper oxide ore separation and smelting product cross-flow centralized re-grinding and flotation separation method provided by the embodiment of the present invention has the following advantages: the method of the embodiment of the present invention effectively improves the ore recovery rate, simplifies the treatment process, the obtained copper sulfide concentrate has a higher grade and a lower yield, reduces the subsequent treatment difficulty of the copper sulfide concentrate, and improves economic benefits.

[0069] The concentrate obtained from the scavenging of copper sulfide and the tailings obtained from the cleaning of copper sulfide can be collectively referred to as the middlings in copper sulfide flotation. Through research, it is found that the middlings mainly consist of the intergrowths of copper sulfide minerals and gangue minerals, as well as the intergrowths of copper sulfide minerals and copper oxide minerals. Due to the poor floatability of copper oxide minerals and gangue minerals, the floatability of the intergrowths is worse than that of the dissociated copper sulfide minerals. If the intergrowths are directly returned to the rough flotation without changing the floatability of the ore, they will eventually circulate continuously in the closed-circuit process of copper sulfide concentrate: a part of them will finally enter the copper sulfide concentrate. Since the intergrowths contain gangue minerals and copper oxide minerals, it not only brings gangue minerals into the subsequent roasting system of copper sulfide concentrate, affecting the roasting index and equipment safety, but also brings copper oxide minerals that do not need to be roasted and can be directly leached, occupying the roasting production capacity and reducing the economic benefits of roasting; another part is recovered with copper oxide minerals and finally becomes leaching residues and enters the tailings due to the inability to be leached by the leaching process of copper oxide minerals, increasing the copper grade in the tailings and reducing the copper recovery rate. In the present invention, after changing the middlings in copper sulfide flotation to be returned to the grinding system of high-oxidation-rate copper ore for regrinding, the dissociation of copper sulfide minerals, gangue minerals, and copper oxide minerals is realized, reducing the entry of associated gangue minerals and copper oxide minerals in the middlings into the copper sulfide concentrate, improving the grade and purity of the copper sulfide concentrate, and enhancing the utilization efficiency of the roasting system.

[0070] A large amount of collector and frother remaining in the middlings of copper sulfide flotation are also returned to flotation after grinding together with the middlings of copper sulfide flotation, enabling the reuse of the remaining flotation reagents in the middlings of copper sulfide flotation and significantly reducing the consumption of collector and frother newly added in the copper sulfide flotation process of high copper oxide ore.

[0071] In the embodiment of the present invention, rougher flotation is carried out on the scavenging tailings obtained from the scavenging of copper sulfide in low-oxidation-rate copper oxide ore. The obtained rougher concentrate is high-grade copper oxide concentrate, and the obtained rougher tailings are subjected to scavenging of copper oxide; the scavenging concentrate obtained from the scavenging of copper oxide is low-grade copper oxide concentrate; the scavenging tailings obtained from the scavenging of copper oxide enter the tailings pond.

[0072] In the embodiment of the present invention, rougher flotation is carried out on the scavenging tailings obtained from the scavenging of copper sulfide in medium-oxidation-rate copper oxide ore. The obtained rougher concentrate is high-grade copper oxide concentrate, and the obtained rougher tailings are subjected to scavenging of copper oxide; the scavenging concentrate obtained from the scavenging of copper oxide is low-grade copper oxide concentrate; the scavenging tailings obtained from the scavenging of copper oxide enter the tailings pond.

[0073] In some embodiments, acid leaching is carried out on the high-grade copper oxide concentrate. The obtained leaching residues are diluted with water, mixed and slurried with the concentrated low-grade copper oxide concentrate, and sent to the grinding process of high-oxidation-rate copper oxide ore.

[0074] The traditional high-grade copper oxide concentrate leach residue is treated by direct flotation process, which not only requires a separate acid-resistant slag flotation system, but also only produces low-grade copper sulfide concentrate (low copper grade, high impurity content, cannot be directly roasted, and difficult to further recover) that cannot be directly used and can only be stored. This has no direct economic benefits and instead generates a lot of costs. In this solution, by mixing the high-grade copper oxide concentrate leach residue with the low-grade copper oxide concentrate, regrinding and reselecting, the flotation product grade can be significantly increased to more than 60%. Research has found that the reason why the copper grade of the slag-selected low-grade copper sulfide concentrate is low is mainly because the copper sulfide minerals are co-existing with the gangue minerals and are not dissociated. By regrinding the copper oxide leach residue, increasing the slag fineness and increasing the dissociation degree of the copper sulfide minerals in the slag, the flotation separation effect of the slag can be improved.

[0075] In some embodiments of the present invention, the pH value of the slurry is adjusted to 1.5-2 by using concentrated sulfuric acid to leach high-grade copper oxide concentrate; the conditions for acid leaching of the high-grade copper oxide concentrate are a slurry concentration of 10wt%-20wt% and a leaching time of 6-9h.

[0076] In some embodiments of the present invention, the leached residue obtained by acid leaching of the high-grade copper oxide concentrate is diluted to a pulp concentration of 60 wt % to 70 wt %.

[0077] In some embodiments of the present invention, the low-grade copper oxide concentrate is concentrated to a pulp concentration of 60wt% to 70wt%. Concentration serves to remove chemicals and adjust pH; it can be achieved using commonly used equipment, such as a thickener. The concentration process removes residual chemicals, primarily sulfiding agents, from the frothed concentrate through overflow. Sulfiding agents are required in the copper oxide flotation scavenging process for low- and medium-oxidation copper oxide ores. Without drug removal, residual sulfiding agents in the low-grade copper oxide concentrate return to the grinding stage and enter the copper sulfide flotation stage. Due to the high sulfiding agent content, this agent will inhibit the copper sulfide ore, significantly reducing the copper sulfide flotation recovery efficiency. Furthermore, through concentration, the pulp concentration of the low-grade copper oxide concentrate can be significantly increased from 5-10% to the optimal grinding concentration, facilitating subsequent processing.

[0078] In some embodiments of the present invention, the mixing and slurrying is: adjusting the pH value of the slurry to 6.5-7.5.

[0079] After the slurry is adjusted to neutral, high-grade copper oxide leaching residue can be neutrally floated. Compared with the original acidic flotation process at pH = 4-5, on the one hand, it can reduce the decomposition of the flotation collector xanthate in the acidic slurry [xanthate (ROCSSN a) decomposes into alcohol (ROH) and carbon disulfide (CS2) in an acidic environment: ROCSS - +H +→ROH + CS2↑ROCSS - +H + →ROH + CS2↑], improve the flotation effect of xanthate; on the other hand, it can avoid the physical harm of the volatilized sulfuric acid to the operators during the flotation process of acidic pulp and improve the occupational health level.

[0080] After the acid leaching residue of high-grade copper oxide concentrate is diluted with water, the pH value is 3 - 5; after the low-grade copper oxide concentrate is concentrated, the pH value is 9 - 10; when the two are mixed and adjusted to pulp, a mixed pulp with a pH value close to neutral can be obtained, avoiding the corrosion of conventional acid- and alkali-intolerant equipment by the pulp with too strong acidity or alkalinity during subsequent treatment.

[0081] The residual sulfuric acid in the leaching residue of high-grade copper oxide concentrate can react with the small amount of residual sulfiding agent in the concentrated low-grade copper oxide concentrate (H2SO4 + 2NaHS → Na2SO4 + 2H2S↑), completely eliminating the inhibitory effect of the residual sulfiding agent on the flotation of copper sulfide.

[0082] Some sulfide ores are prone to form oxide films (such as FeOOH, CuO, etc.) on the surface after being exposed to air, which hinders the adsorption of collectors; during the stirring and pulp adjustment process of the residual sulfuric acid in the leaching residue of high-grade copper oxide concentrate and the concentrated low-grade copper oxide concentrate, sulfuric acid dissolves the oxide layer through acid etching (FeOOH + 3H + →Fe 3+ + 2H2O), exposing the fresh mineral surface and also enhancing the adsorption ability of collectors (such as xanthate).

[0083] During the stirring and pulp adjustment process of the residual sulfuric acid in the leaching residue of high-grade copper oxide concentrate and the concentrated low-grade copper oxide concentrate, sulfuric acid can also react with the acid-consuming gangue carbonate minerals (such as CaCO3, MgCO3) in the low-grade copper oxide concentrate (CaCO3 + H2SO4 → CaSO4 + CO2↑ + H2O), reducing the content of acid-consuming gangue minerals in the low-grade copper oxide concentrate and reducing the sulfuric acid consumption for sulfuric acid leaching after the low-grade copper oxide concentrate is reground and reselected.

[0084] In the embodiment of the present invention, the scavenging tailings obtained by scavenging copper sulfide from the high oxidation rate copper oxide ore are acid leached, and the residue is subjected to countercurrent washing (CCD) to obtain leaching solution and leaching residue. The acid leaching and CCD treatment of the scavenging tailings can be carried out in a conventional manner.

[0085] The scavenging tailings obtained by scavenging copper sulfide from the high oxidation rate copper oxide ore are no longer subjected to copper oxide flotation. Utilizing this feature, compared with general grinding, the grinding fineness can be further improved without affecting flotation, matching the regrinding fineness requirements of the middlings of copper sulfide flotation with insufficient mineral dissociation, low-grade copper oxide concentrate, and the leaching residue of high-grade copper oxide concentrate.

[0086] In the embodiments of the present invention, the concentration of copper sulfide is carried out once or more than twice.

[0087] In some embodiments, when the concentration of copper sulfide is more than twice, the middlings are sequentially returned.

[0088] In the embodiments of the present invention, the scavenging of copper sulfide is carried out once or more than twice.

[0089] In some embodiments, when the scavenging of copper sulfide is more than twice, the middlings are sequentially returned.

[0090] In the embodiments of the present invention, the scavenging of copper oxide is carried out once or more than twice.

[0091] In some embodiments, when the scavenging of copper oxide is more than twice, the concentrate obtained each time is used as the scavenging concentrate.

[0092] In the embodiments of the present invention, the copper grade of the raw ore is 2 wt% - 4 wt%, and the oxidation rate is 30 wt% - 95 wt%.

[0093] In the embodiments of the present invention, the low oxidation rate copper oxide ore is ground to particles finer than 200 mesh accounting for 68 wt% - 71 wt%.

[0094] In the embodiments of the present invention, the medium oxidation rate copper oxide ore is ground to particles finer than 200 mesh accounting for 68 wt% - 73 wt%.

[0095] In the embodiments of the present invention, the high oxidation rate copper oxide ore is ground to particles finer than 200 mesh accounting for 85 wt% - 90 wt%.

[0096] In order to improve the recovery effect of copper sulfide minerals as much as possible, the grinding fineness should be increased as much as possible to improve the dissociation degree of copper sulfide minerals. However, if the grinding fineness is too fine, the slime phenomenon will be aggravated, and the slime is easy to cover the surface of flotation reagents and target minerals, reducing the subsequent flotation effect of copper oxide and increasing the reagent consumption. After comprehensive consideration, the fineness of the low oxidation rate copper oxide ore and the medium oxidation rate copper oxide ore should not be too fine. At this grinding fineness, some copper sulfide minerals are not completely dissociated (including some not dissociated from copper oxide minerals and some not dissociated from gangue minerals). During the copper sulfide flotation process, they become copper sulfide middlings and are sent to the grinding process of high oxidation rate copper oxide ore with a higher grinding fineness for further dissociation. Since the high oxidation rate copper oxide ore does not need to carry out copper oxide flotation, it still has a good recovery effect after setting a higher grinding fineness.

[0097] In the embodiments of the present invention, the collector used for the low oxidation rate copper oxide ore dressing is butyl xanthate.

[0098] In the embodiments of the present invention, the frother used for the low oxidation rate copper oxide ore dressing is pine oil.

[0099] In an embodiment of the present invention, the sulfiding agent used for the beneficiation of low oxidation rate copper oxide is sodium hydrosulfide.

[0100] In an embodiment of the present invention, the collector used for the beneficiation of medium oxidation rate copper oxide is butyl xanthate.

[0101] In an embodiment of the present invention, the frother used for the beneficiation of medium oxidation rate copper oxide is pine oil.

[0102] In an embodiment of the present invention, the sulfiding agent used for the beneficiation of medium oxidation rate copper oxide is sodium hydrosulfide.

[0103] In an embodiment of the present invention, the collector used for the beneficiation of high oxidation rate copper oxide is butyl xanthate.

[0104] In an embodiment of the present invention, the frother used for the beneficiation of high oxidation rate copper oxide is pine oil.

[0105] In an embodiment of the present invention, in the rough selection of copper sulfide of low oxidation rate copper oxide, the total dosage of the collector is 50 - 100 g / t.

[0106] In an embodiment of the present invention, in the rough selection of copper sulfide of low oxidation rate copper oxide, the total dosage of the frother is 10 - 20 g / t.

[0107] In an embodiment of the present invention, in the scavenging selection of copper sulfide of low oxidation rate copper oxide, the total dosage of the collector is 20 - 50 g / t.

[0108] In an embodiment of the present invention, in the scavenging selection of copper sulfide of low oxidation rate copper oxide, the total dosage of the frother is 5 - 10 g / t.

[0109] In an embodiment of the present invention, in the rough selection of copper sulfide of medium oxidation rate copper oxide, the dosage of the collector each time is 30 - 60 g / t.

[0110] In an embodiment of the present invention, in the rough selection of copper sulfide of medium oxidation rate copper oxide, the dosage of the frother each time is 10 - 15 g / t.

[0111] In an embodiment of the present invention, in the scavenging selection of copper sulfide of medium oxidation rate copper oxide, the dosage of the collector each time is 10 - 30 g / t.

[0112] In an embodiment of the present invention, in the scavenging selection of copper sulfide of medium oxidation rate copper oxide, the dosage of the frother each time is 5 - 10 g / t.

[0113] In an embodiment of the present invention, in the rough selection of copper sulfide of high oxidation rate copper oxide, the dosage of the collector each time is 100 - 200 g / t.

[0114] In the embodiment of the present invention, in the rough selection of copper sulfide for high oxidation rate copper oxide, the dosage of the frother each time is 10 - 20 g / t.

[0115] In the embodiment of the present invention, in the scavenging selection of copper sulfide for high oxidation rate copper oxide, the dosage of the collector each time is 50 - 100 g / t.

[0116] In the embodiment of the present invention, in the scavenging selection of copper sulfide for high oxidation rate copper oxide, the dosage of the frother each time is 5 - 10 g / t.

[0117] In the embodiment of the present invention, in the rough selection of copper oxide for low oxidation rate copper oxide, the total dosage of the sulfiding agent is 600 - 1200 g / t.

[0118] In the embodiment of the present invention, in the rough selection of copper oxide for low oxidation rate copper oxide, the total dosage of the collector is 30 - 80 g / t.

[0119] In the embodiment of the present invention, in the rough selection of copper oxide for low oxidation rate copper oxide, the total dosage of the frother is 5 - 10 g / t.

[0120] In the embodiment of the present invention, in the scavenging selection of copper oxide for low oxidation rate copper oxide, the total dosage of the sulfiding agent is 200 - 600 g / t.

[0121] In the embodiment of the present invention, in the scavenging selection of copper oxide for low oxidation rate copper oxide, the total dosage of the collector is 10 - 40 g / t.

[0122] In the embodiment of the present invention, in the scavenging selection of copper oxide for low oxidation rate copper oxide, the total dosage of the frother is 5 - 10 g / t.

[0123] In the embodiment of the present invention, in the rough selection of copper oxide for medium oxidation rate copper oxide, the dosage of the sulfiding agent each time is 2000 - 3500 g / t.

[0124] In the embodiment of the present invention, in the rough selection of copper oxide for medium oxidation rate copper oxide, the dosage of the collector each time is 100 - 150 g / t.

[0125] In the embodiment of the present invention, in the rough selection of copper oxide for medium oxidation rate copper oxide, the dosage of the frother each time is 5 - 10 g / t. ]>

[0126] In the embodiment of the present invention, in the scavenging selection of copper oxide for medium oxidation rate copper oxide, the dosage of the sulfiding agent each time is 300 - 1500 g / t.

[0127] In the embodiment of the present invention, in the scavenging selection of copper oxide for medium oxidation rate copper oxide, the dosage of the collector each time is 20 - 70 g / t.

[0128] In the embodiments of the present invention, in the scavenging of copper oxide with medium oxidation rate, the dosage of the frother each time is 0 - 5 g / t.

[0129] In the flotation process of low oxidation rate copper oxide ore and medium oxidation rate copper oxide ore, the method of sulfidizing with a sulfiding agent (generally sodium hydrosulfide or sodium sulfide) and then collecting with xanthate for flotation is commonly used; however, when the sulfiding agent is in excess, it will instead inhibit the sulfidized copper oxide minerals; due to this characteristic of copper oxide flotation, in production, the copper oxide flotation section generally adopts open-circuit flotation, that is, the concentrate selected is not returned to the previous process for closed-circuit flotation enrichment, because if it is returned to the previous flotation process in a closed circuit, the sulfiding agent in the froth concentrate will also be brought into the previous copper oxide ore flotation process, making the sulfiding agent in the previous copper oxide ore flotation section exceed the optimal range and deteriorating the flotation index; in order to reduce the operation difficulty of copper oxide flotation and improve the recovery rate of copper oxide flotation, all-open-circuit flotation is adopted for copper oxide flotation. Since the copper oxide flotation section is all-open-circuit flotation, the later the process, the lower the grade of the flotation concentrate and the higher the yield, that is: the roughing of copper oxide produces high-grade copper oxide concentrate with a grade of 10 - 25%; the scavenging of copper oxide produces low-grade copper oxide concentrate with a grade of 2 - 5%. The low-grade copper oxide concentrate contains partially undissociated copper sulfide minerals and cannot be leached by sulfuric acid, resulting in a low leaching rate of only 30 - 50%, and the un-leached part is lost in the smelting slag.

[0130] Example

[0131] The following examples more specifically describe the content disclosed in the present invention. These examples are only for illustrative purposes, because various modifications and changes within the scope of the content disclosed in the present invention are obvious to those skilled in the art. Unless otherwise stated, all parts, percentages, and ratios reported in the following examples are based on weight. Unless otherwise stated, all reagents used in the examples can be obtained through conventional commercial channels or synthesized according to conventional methods and can be used directly without further treatment. Unless otherwise stated, all instruments used in the examples can be obtained through conventional commercial channels.

[0132] Example 1

[0133] A copper mine in the Democratic Republic of the Congo has an average copper grade of the raw ore of 2.97% and an average oxidation rate of 56.67%, and the ore properties are complex. The method of recycling by the method of concentrating and regrinding the flotation of copper oxide ore dressing products in series is adopted, and the process flow is as Figure 1 shown. The specific method of this example is as follows:

[0134] The copper oxide ore is classified according to the oxidation rate into: low-oxidation-rate copper oxide ore with an oxidation rate of less than 50% (the measured average copper grade is 3% - 3.5%), medium-oxidation-rate copper oxide ore with an oxidation rate of 50% - 75% (the measured average copper grade is 2% - 3%, and the content of acid-consuming carbonate gangue minerals is relatively high), and high-oxidation-rate copper oxide ore with an oxidation rate of more than 75% (the measured average copper grade is 3% - 4%, and the content of acid-consuming carbonate gangue minerals is relatively low).

[0135] (1) Treatment of low-oxidation-rate copper oxide ore:

[0136] The low-oxidation-rate copper oxide ore is ground to a particle size finer than 200 mesh, accounting for 70%. Then, rough selection of copper sulfide is carried out. The tailings obtained from the rough selection are subjected to scavenging of copper sulfide, and the concentrate obtained from the rough selection is subjected to cleaning of copper sulfide; the concentrate obtained from the scavenging of copper sulfide and the tailings obtained from the cleaning of copper sulfide are sent to the grinding process of high-oxidation-rate copper oxide ore; the concentrate obtained from the cleaning of copper sulfide is copper sulfide concentrate;

[0137] Rough selection of copper oxide is carried out on the scavenging tailings obtained from the scavenging of copper sulfide in the low-oxidation-rate copper oxide ore. The concentrate obtained from the rough selection is high-grade copper oxide concentrate, and the tailings obtained from the rough selection are subjected to scavenging of copper oxide; the scavenging concentrate obtained from the scavenging of copper oxide is low-grade copper oxide concentrate; the scavenging tailings obtained from the scavenging of copper oxide enter the tailings pond as the final tailings of the present embodiment scheme.

[0138] Among them, the collector used for the beneficiation of low-oxidation-rate copper oxide ore is butyl xanthate, the frother is pine oil alcohol, and the sulfiding agent is sodium hydrosulfide;

[0139] Among them, the rough selection of copper sulfide is carried out once, the collector dosage is 80 g / t, and the frother dosage is 15 g / t;

[0140] Among them, the scavenging of copper sulfide is carried out once, the collector dosage is 40 g / t, and the frother dosage is 7.5 g / t;

[0141] Among them, the cleaning of copper sulfide is carried out five times, which is blank cleaning without adding reagents. The concentrates obtained from the first to the fourth cleaning enter the next cleaning, and the tailings obtained from each cleaning are sequentially returned;

[0142] Among them, the rough selection of copper oxide is carried out once, the sulfiding agent dosage is 800 g / t, the collector dosage is 40 g / t, and the frother dosage is 5 g / t;

[0143] Among them, the scavenging of copper oxide is carried out twice, the total sulfiding agent dosage is 400 g / t, the total collector dosage is 20 g / t, and the total frother dosage is 7.5 g / t. The tailings obtained from the first scavenging are subjected to the second scavenging, and the concentrates obtained from the two scavengings are used as scavenging concentrates.

[0144] (2) Treatment of medium-oxidation-rate copper oxide ore:

[0145] The medium oxidation rate copper oxide ore is ground to particles finer than 200 mesh, accounting for 71%, and rough selection of copper sulfide is carried out. The tailings obtained from the rough selection are subjected to scavenging of copper sulfide, and the concentrate obtained from the rough selection is subjected to cleaning of copper sulfide; the concentrate obtained from the scavenging of copper sulfide and the tailings obtained from the cleaning of copper sulfide are fed into the grinding process of the high oxidation rate copper oxide ore; the cleaned concentrate obtained from the cleaning of copper sulfide is the copper sulfide concentrate.

[0146] Rough selection of copper oxide is carried out on the scavenging tailings obtained from the scavenging of copper sulfide in the medium oxidation rate copper oxide ore. The rough concentrate obtained is the high-grade copper oxide concentrate, and the tailings obtained from the rough selection are subjected to scavenging of copper oxide; the scavenging concentrate obtained from the scavenging of copper oxide is the low-grade copper oxide concentrate; the scavenging tailings obtained from the scavenging of copper oxide enter the tailings pond as the final tailings of the solution of this embodiment.

[0147] Among them, the sulfurizing agent used in the beneficiation of medium oxidation rate copper oxide ore is sodium hydrosulfide, the collector is butyl xanthate, and the foaming agent is pine oil. [[ID=⑨]]

[0148] Among them, the rough selection of copper sulfide is carried out once, the dosage of the collector is 50 g / t, and the dosage of the foaming agent is 12.5 g / t.

[0149] Among them, the scavenging of copper sulfide is carried out once, the dosage of the collector is 20 g / t, and the dosage of the foaming agent is 7.5 g / t.

[0150] Among them, the cleaning of copper sulfide is carried out five times, which is blank cleaning without adding reagents. The concentrates obtained from the first to the fourth cleaning enter the next cleaning, and the tailings obtained from each cleaning are sequentially returned.

[0151] Among them, the rough selection of copper oxide is carried out once, the dosage of the sulfurizing agent is 2500 g / t, the dosage of the collector is 120 g / t, and the dosage of the foaming agent each time is 7.5 g / t.

[0152] Among them, the scavenging of copper oxide is carried out six times. The dosage of the sulfurizing agent each time is 700 g / t, the dosage of the collector each time is 50 g / t, and the dosage of the foaming agent each time is 2.5 g / t; the tailings obtained from the first to the fifth scavenging are subjected to the next scavenging, and the concentrate obtained from each scavenging is used as the scavenging concentrate.

[0153] (3) Treatment of the obtained high-grade copper oxide concentrate and low-grade copper oxide concentrate:

[0154] The high-grade copper oxide concentrate is subjected to acid leaching. The obtained leaching residue is diluted with water to a pulp concentration of 65%, mixed and slurried with the low-grade copper oxide concentrate concentrated to a pulp concentration of 65%, and fed into the grinding process of the high oxidation rate copper oxide ore.

[0155] The specific method of acid leaching is as follows: the pH value of the pulp is adjusted to 1.5 by using concentrated sulfuric acid to leach high-grade copper oxide concentrate; the conditions for acid leaching of the high-grade copper oxide concentrate are a pulp concentration of 20 wt% and a leaching time of 9 h.

[0156] After acid leaching and dilution of the high-grade copper oxide concentrate, the measured pH value is 4; after concentration of the low-grade copper oxide concentrate, the measured pH value is 9.5; after mixing and pulp adjustment, the pH value of the resulting mixed pulp is 7.

[0157] (4) Treatment of high oxidation rate copper oxide ore:

[0158] The high oxidation rate copper oxide ore (as well as the concentrate obtained from the scavenging of copper sulfide in each process, the tailings obtained from the cleaning of copper sulfide in each process, the high-grade copper oxide concentrate, and the mixed pulp obtained after the treatment of the low-grade copper oxide concentrate) is ground to a particle size finer than 200 mesh accounting for 88%, and rough selection of copper sulfide is carried out. The tailings obtained from the rough selection are subjected to scavenging of copper sulfide, and the concentrate obtained from the rough selection is subjected to cleaning of copper sulfide; the concentrate obtained from the scavenging of copper sulfide and the tailings obtained from the cleaning of copper sulfide are returned to the grinding process of the high oxidation rate copper oxide ore; the concentrate obtained from the cleaning of copper sulfide is the copper sulfide concentrate.

[0159] Among them, the collector used for the beneficiation of high oxidation rate copper oxide ore is butyl xanthate, and the foaming agent is pine oil;

[0160] Among them, the rough selection of copper sulfide is carried out once, the dosage of the collector is 150 g / t, and the dosage of the foaming agent is 15 g / t;

[0161] Among them, the scavenging of copper sulfide is carried out twice, the dosage of the collector each time is 75 g / t, and the dosage of the foaming agent each time is 7.5 g / t; the tailings from the first scavenging are subjected to the second scavenging, and the concentrate obtained from each scavenging is sequentially returned;

[0162] Among them, the cleaning of copper sulfide is carried out five times, which is a blank cleaning without adding reagents. The concentrate obtained from the first to the fourth cleaning enters the next cleaning, and the tailings obtained from each cleaning are sequentially returned.

[0163] The scavenging tailings (high copper tailings) obtained from the scavenging of copper sulfide in the high oxidation rate copper oxide ore are acid leached, and the slag is subjected to countercurrent washing. The copper metal in the washing liquid finally enters the leaching solution for recovery, obtaining the leaching solution and the leaching residue; the leaching residue enters the tailings pond as the final tailings of the embodiment scheme; among them, the specific method of acid leaching is as follows: the pH value of the pulp is adjusted to 1.5 by using concentrated sulfuric acid, the concentration of the pulp is 20 wt%, and the leaching time is 9 h; the washing equipment for countercurrent washing is a thickener, the number of washing times is 5 times, and the countercurrent washing ratio of the thickener is 1.5 (the ratio of the volume of the additional washing water outside the thickener to the volume of the solution in the underflow is called the washing ratio R).

[0164] The detection data of the final concentrate and final tailings obtained in this embodiment are shown in Table 1.

[0165] Table 1 Test results of the comprehensive ore dressing method in Example 1

[0166]

[0167] Comparative Example 1

[0168] The ore used in this comparative example is the same as that in Example 1, and the current common treatment method is used for ore dressing. The main differences from Example 1 of the present invention are as follows:

[0169] (1) For the copper sulfide flotation middlings of low-oxidation-rate copper oxide ore, medium-oxidation-rate copper oxide ore, and high-oxidation-rate copper oxide ore (i.e., the concentrate obtained by copper sulfide scavenging and the tailings obtained by copper sulfide cleaning), instead of entering the grinding process of high-oxidation-rate copper oxide ore, they are returned to their respective copper sulfide roughing;

[0170] (2) After obtaining high-grade copper oxide concentrate, low-grade copper oxide concentrate, and scavenging tailings (high-copper tailings) obtained by copper sulfide scavenging of high-oxidation-rate copper oxide ore, they are not processed anymore and are directly recorded as concentrate;

[0171] (3) The scavenging tailings obtained by copper oxide scavenging of low-oxidation-rate copper oxide ore and medium-oxidation-rate copper oxide ore are recorded as the final tailings.

[0172] The specific method used in this comparative example is as follows:

[0173] The copper oxide ore is classified according to the oxidation rate into: low-oxidation-rate copper oxide ore with an oxidation rate below 50%, medium-oxidation-rate copper oxide ore with an oxidation rate of 50% - 75%, and high-oxidation-rate copper oxide ore with an oxidation rate above 75%.

[0174] (1) Treatment of low-oxidation-rate copper oxide ore:

[0175] The low-oxidation-rate copper oxide ore is ground to have 70% of the particles finer than 200 mesh, and then copper sulfide roughing is carried out. The obtained roughing tailings are subjected to copper sulfide scavenging, and the obtained roughing concentrate is subjected to copper sulfide cleaning; the concentrate obtained by copper sulfide scavenging and the tailings obtained by copper sulfide cleaning are returned to the grinding process of low-oxidation-rate copper oxide ore; the cleaning concentrate obtained by copper sulfide cleaning is copper sulfide concentrate;

[0176] The scavenging tailings obtained by copper sulfide scavenging of the low-oxidation-rate copper oxide ore are subjected to copper oxide roughing. The obtained roughing concentrate is high-grade copper oxide concentrate, and the obtained roughing tailings are subjected to copper oxide scavenging; the scavenging concentrate obtained by copper oxide scavenging is low-grade copper oxide concentrate; the scavenging tailings obtained by copper oxide scavenging are used as the final tailings of this comparative example and enter the tailings pond.

[0177] The specific operations and reagents used in the flotation of the low oxidation rate copper oxide ore are the same as those in Example 1.

[0178] (2) Treatment of medium oxidation rate copper oxide ore:

[0179] The medium oxidation rate copper oxide ore is ground to particles finer than 200 mesh accounting for 71%, and rough selection of copper sulfide is carried out. The tailings obtained from the rough selection are subjected to scavenging of copper sulfide, and the concentrate obtained from the rough selection is subjected to cleaning of copper sulfide; the concentrate obtained from the scavenging of copper sulfide and the tailings obtained from the cleaning of copper sulfide are returned to the grinding process of the medium oxidation rate copper oxide ore; the concentrate obtained from the cleaning of copper sulfide is the copper sulfide concentrate.

[0180] Rough selection of copper oxide is carried out on the tailings obtained from the scavenging of copper sulfide in the medium oxidation rate copper oxide ore. The concentrate obtained from the rough selection is the high-grade copper oxide concentrate, and the tailings obtained from the rough selection are subjected to scavenging of copper oxide; the concentrate obtained from the scavenging of copper oxide is the low-grade copper oxide concentrate; the tailings obtained from the scavenging of copper oxide enter the tailings pond as the final tailings of this embodiment scheme.

[0181] The specific operations and reagents used in the flotation of the medium oxidation rate copper oxide ore are the same as those in Example 1.

[0182] (3) Treatment of high oxidation rate copper oxide ore:

[0183] The high oxidation rate copper oxide ore is ground to particles finer than 200 mesh accounting for 88%, and rough selection of copper sulfide is carried out. The tailings obtained from the rough selection are subjected to scavenging of copper sulfide, and the concentrate obtained from the rough selection is subjected to cleaning of copper sulfide; the concentrate obtained from the scavenging of copper sulfide and the tailings obtained from the cleaning of copper sulfide are returned to the grinding process of the high oxidation rate copper oxide ore; the concentrate obtained from the cleaning of copper sulfide is the copper sulfide concentrate.

[0184] The specific operations and reagents used in the flotation of the high oxidation rate copper oxide ore are the same as those in Example 1.

[0185] The tailings obtained from the scavenging of copper sulfide in the high oxidation rate copper oxide ore are high copper tailings.

[0186] The detection data of the final concentrate and final tailings obtained in this comparative example are shown in Table 2.

[0187] Table 2 Test results of the comprehensive ore dressing method in Comparative Example 1

[0188]

[0189] From the test results of Example 1 and Comparative Example 1, it can be seen that for the same ore and the same throughput, compared with the conventional beneficiation method, using the process of the invention: the copper grade of the copper sulfide concentrate is increased from 64.33% to 68.22%, an increase of 3.89 percentage points; the yield of the copper sulfide concentrate is decreased from 2.40% to 1.93%, a decrease of 19.58%, reducing the throughput of the subsequent roasting of the copper sulfide concentrate and the roasting production cost.

[0190] In Comparative Example 1, the high-grade copper oxide concentrate, low-grade copper oxide concentrate, and the scavenging tailings (high-copper tailings) obtained from the scavenging of copper sulfide in high-oxidation-rate copper oxide ore were directly recorded as concentrates, which is different from Example 1 where the leaching solutions of the high-grade copper oxide concentrate and high-copper tailings were used for calculation. There must be losses in the further smelting (such as leaching) of the high-grade copper oxide concentrate, low-grade copper oxide concentrate, and high-copper tailings. For example, when the scavenging concentrates obtained from the scavenging of copper oxide in low-oxidation-rate copper oxide ore and medium-oxidation-rate copper oxide ore in Comparative Example 1, that is, the low-grade copper oxide concentrate, were leached by conventional sulfuric acid, the leaching rate was only 50 - 60%, and the copper grade of the leaching residue was still as high as 1.5 - 2%. Therefore, the calculated value of the total concentrate copper recovery rate in Comparative Example 1 is on the high side. If the same calculation standard as in Example 1 is adopted, the result will be lower; even so, the total concentrate copper recovery rate calculated in Example 1 is 85.27%, still 0.62 percentage points higher than 84.65% calculated in Comparative Example 1.

[0191] In Example 1, after regrinding to dissociate copper sulfide minerals from gangue minerals and copper oxide minerals, the flotation efficiency of the middlings in the re-flotation of copper sulfide in low-oxidation-rate copper oxide ore and medium-oxidation-rate copper oxide ore was greatly improved, the return amount of the middlings was greatly reduced, and at the same time, the influence of the return of the middlings to the roughing of copper sulfide flotation on the roughing of copper sulfide flotation was reduced, resulting in an increase in the copper grade of the copper sulfide concentrate obtained in Example 1.

[0192] The recovery rate of the copper sulfide concentrate in Example 1 decreased compared with Comparative Example 1, mainly because after grinding, the dissociation degree of copper sulfide minerals and copper oxide minerals increased, the intergrowth of copper oxide minerals and copper sulfide minerals decreased, reducing the entry of intergrown copper oxide minerals into the roughing concentrate of copper sulfide flotation and the scavenging concentrate of copper sulfide flotation, and reducing the content of copper oxide minerals in the copper sulfide concentrate; the dissociated copper oxide minerals in Example 1 entered the tailings of copper sulfide flotation and were recovered in the subsequent copper oxide flotation, without being lost in the flotation tailings. Therefore, the total copper recovery rate will not decrease.

[0193] Reference Example

[0194] Using the same raw materials, process, and parameters as in Example 1, the leaching residue from the acid leaching of the high-grade copper oxide concentrate obtained in Example 1 was obtained for the washing test.

[0195] Add clear water and stir to adjust the pulp. Adjust the leaching residue to a pulp concentration of 25% (equivalent to a single clear water washing). After clarification, take the upper clear liquid (washing liquid) to detect the copper content, and take the lower pulp (washing residue) for filtration to detect the copper grade, and calculate the washing rate; the test results are shown in Table 3.

[0196] Table 3 Washing Test Results of Leaching Residue of High-Grade Copper Oxide Concentrate

[0197]

[0198] As can be seen from Table 3, the washing rate of the leaching residue of high-grade copper oxide concentrate by a single clear water washing is 29.74%.

[0199] When the existing process treats the leaching residue of high-grade copper oxide concentrate, it adds clear water to adjust the pulp to a concentration of ~30% and then directly performs acid flotation to obtain low-grade copper sulfide concentrate, and the flotation tailings are discarded as the final tailings; as the test results of this experiment show, 29.74% of the copper enters the washing liquid during the clear water pulping process. This part of the copper cannot be recovered by flotation and will be completely lost in the final tailings, resulting in a decrease in copper recovery rate.

[0200] In the present invention, the leaching residue of high-grade copper oxide concentrate is incorporated into the treatment of high oxidation rate copper oxide ore. The washing liquid enters the sulfur flotation tailings of high oxidation rate copper oxide ore with the copper sulfide flotation, and by using the existing CCD (countercurrent washing) process in the original process, the copper metal in the washing liquid finally enters the leaching liquid and is recovered.

[0201] Example 2

[0202] For a copper mine in the Democratic Republic of the Congo, the original ore has a copper grade of 2.42% and an oxidation rate of 50.60%, and the ore properties are complex. The copper oxide ore is recovered by the method of concentrating and re-grinding the flotation of copper oxide ore dressing products in series. The specific method of this example is as follows:

[0203] According to the oxidation rate, the copper oxide ore is divided into: low oxidation rate copper oxide ore with an oxidation rate below 50% (the measured average copper grade is 3% - 3.5%), medium oxidation rate copper oxide ore with an oxidation rate of 50% - 75% (the measured average copper grade is 2% - 3%, and the content of acid-consuming carbonate gangue minerals is relatively high), and high oxidation rate copper oxide ore with an oxidation rate above 75% (the measured average copper grade is 3% - 4%, and the content of acid-consuming carbonate gangue minerals is relatively low).

[0204] (1) Treatment of low oxidation rate copper oxide ore:

[0205] The low oxidation rate copper oxide ore is ground to particles finer than 200 mesh, accounting for 71%. Copper sulfide roughing is carried out, and the tailings obtained from the roughing are subjected to copper sulfide scavenging, and the concentrate obtained from the roughing is subjected to copper sulfide cleaning; the concentrate obtained from the copper sulfide scavenging and the tailings obtained from the copper sulfide cleaning are sent to the grinding process of the high oxidation rate copper oxide ore; the concentrate obtained from the copper sulfide cleaning is the copper sulfide concentrate.

[0206] Copper oxide roughing is carried out on the scavenging tailings obtained from the copper sulfide scavenging of the low oxidation rate copper oxide ore. The concentrate obtained from the roughing is the high-grade copper oxide concentrate, and the tailings obtained from the roughing are subjected to copper oxide scavenging; the scavenging concentrate obtained from the copper oxide scavenging is the low-grade copper oxide concentrate; the scavenging tailings obtained from the copper oxide scavenging enter the tailings pond as the final tailings of the embodiment scheme.

[0207] Among them, the collector used for the low oxidation rate copper oxide ore dressing is butyl xanthate, the foaming agent is pine oil alcohol, and the sulfiding agent is sodium hydrosulfide.

[0208] Among them, the copper sulfide roughing is carried out once, the dosage of the collector is 60 g / t, and the dosage of the foaming agent is 10 g / t.

[0209] Among them, the copper sulfide scavenging is carried out once, the dosage of the collector is 30 g / t, and the dosage of the foaming agent is 5 g / t.

[0210] Among them, the copper sulfide cleaning is carried out five times, which is a blank cleaning without adding reagents. The concentrates obtained from the first to the fourth cleanings enter the next cleaning, and the tailings obtained from each cleaning are sequentially returned.

[0211] Among them, the copper oxide roughing is carried out once, the dosage of the sulfiding agent is 600 g / t, the dosage of the collector is 30 g / t, and the dosage of the foaming agent is 5 g / t.

[0212] Among them, the copper oxide scavenging is carried out twice, the total dosage of the sulfiding agent is 200 g / t, the total dosage of the collector is 10 g / t, and the total dosage of the foaming agent is 5 g / t. The tailings obtained from the first scavenging are subjected to the second scavenging, and the concentrates obtained from the two scavengings are used as the scavenging concentrates.

[0213] (2) Treatment of medium oxidation rate copper oxide ore:

[0214] The medium oxidation rate copper oxide ore is ground to particles finer than 200 mesh, accounting for 72%. Copper sulfide roughing is carried out, and the tailings obtained from the roughing are subjected to copper sulfide scavenging, and the concentrate obtained from the roughing is subjected to copper sulfide cleaning; the concentrate obtained from the copper sulfide scavenging and the tailings obtained from the copper sulfide cleaning are sent to the grinding process of the high oxidation rate copper oxide ore; the concentrate obtained from the copper sulfide cleaning is the copper sulfide concentrate.

[0215] The scavenging tailings obtained from the scavenging of copper sulfide in the medium oxidation rate copper oxide ore are subjected to rougher concentration of copper oxide. The rougher concentrate obtained is high-grade copper oxide concentrate, and the rougher tailings obtained are subjected to scavenging of copper oxide; the scavenging concentrate obtained from the scavenging of copper oxide is low-grade copper oxide concentrate; the scavenging tailings obtained from the scavenging of copper oxide enter the tailings pond as the final tailings of the solution of this embodiment.

[0216] Among them, the sulfiding agent used in the beneficiation of medium oxidation rate copper oxide ore is sodium hydrosulfide, the collector is butyl xanthate, and the foaming agent is pine oil;

[0217] Among them, the rougher concentration of copper sulfide is carried out once, the dosage of the collector is 40 g / t, and the dosage of the foaming agent is 10 g / t;

[0218] Among them, the scavenging of copper sulfide is carried out once, the dosage of the collector is 10 g / t, and the dosage of the foaming agent is 5 g / t;

[0219] Among them, the cleaning of copper sulfide is carried out five times, which is blank cleaning without adding reagents. The concentrates obtained from the first to the fourth cleaning enter the next cleaning, and the tailings obtained from each cleaning are sequentially returned;

[0220] Among them, the rougher concentration of copper oxide is carried out once, the dosage of the sulfiding agent is 2000 g / t, the dosage of the collector is 100 g / t, and the dosage of the foaming agent each time is 5 g / t;

[0221] Among them, the scavenging of copper oxide is carried out six times, the dosage of the sulfiding agent each time is 600 g / t, the dosage of the collector each time is 30 g / t, and the dosage of the foaming agent each time is 0 g / t; the tailings obtained from the first to the fifth scavenging are subjected to the next scavenging, and the concentrates obtained from each scavenging are used as scavenging concentrates.

[0222] (3) Treatment of the obtained high-grade copper oxide concentrate and low-grade copper oxide concentrate:

[0223] The high-grade copper oxide concentrate is subjected to acid leaching. The obtained leaching residue is diluted with water until the pulp concentration is 60%, and is mixed and slurried with the low-grade copper oxide concentrate concentrated to a pulp concentration of 60%, and then sent to the grinding process of high oxidation rate copper oxide ore;

[0224] The specific method of the acid leaching is: adjusting the pH value of the pulp to 2 by using concentrated sulfuric acid to leach the high-grade copper oxide concentrate; the conditions for the acid leaching of the high-grade copper oxide concentrate are a pulp concentration of 10 wt% and a leaching time of 6 h.

[0225] Among them, the pH value measured after the acid leaching-dilution of the high-grade copper oxide concentrate is 3.8; the pH value measured after the concentration of the low-grade copper oxide concentrate is 9; the pH value of the mixed pulp obtained after the mixed slurrying is 6.8.

[0226] (4) Treatment of high oxidation rate copper oxide ore:

[0227] The high oxidation rate copper oxide ore (as well as the concentrate obtained from the scavenging of copper sulfide in each process, the tailings obtained from the cleaning of copper sulfide in each process, the high-grade copper oxide concentrate, and the mixed pulp obtained after the treatment of the low-grade copper oxide concentrate) is ground to a particle size finer than 200 mesh, accounting for 90%. Then, rough selection of copper sulfide is carried out. The tailings obtained from the rough selection are subjected to scavenging of copper sulfide, and the concentrate obtained from the rough selection is subjected to cleaning of copper sulfide. The concentrate obtained from the scavenging of copper sulfide and the tailings obtained from the cleaning of copper sulfide are returned to the grinding process of the high oxidation rate copper oxide ore. The concentrate obtained from the cleaning of copper sulfide is the copper sulfide concentrate.

[0228] Among them, the collector used for the beneficiation of high oxidation rate copper oxide ore is butyl xanthate, and the frother is pine oil.

[0229] Among them, the rough selection of copper sulfide is carried out once, the dosage of the collector is 100 g / t, and the dosage of the frother is 10 g / t.

[0230] Among them, the scavenging of copper sulfide is carried out twice. The dosage of the collector each time is 50 g / t, and the dosage of the frother each time is 5 g / t. The tailings from the first scavenging are subjected to the second scavenging, and the concentrate obtained from each scavenging is sequentially returned.

[0231] Among them, the cleaning of copper sulfide is carried out five times, which is blank cleaning without adding reagents. The concentrate obtained from the first to the fourth cleaning enters the next cleaning, and the tailings obtained from each cleaning are sequentially returned.

[0232] The scavenging tailings (high copper tailings) obtained from the scavenging of copper sulfide in the high oxidation rate copper oxide ore are subjected to acid leaching, and the slag is subjected to countercurrent washing. The copper metal in the washing liquid finally enters the leaching solution for recovery, obtaining the leaching solution and the leaching residue. The leaching residue enters the tailings pond as the final tailings of this embodiment. Among them, the specific method of acid leaching is: adjusting the pH value of the pulp to 2 by using concentrated sulfuric acid, the concentration of the pulp is 10 wt%, and the leaching time is 6 h. The washing equipment for countercurrent washing is a thickener, the number of washing times is 5 times, and the countercurrent washing ratio of the thickener is 1.5 (the ratio of the volume of the additional washing water outside the thickener to the volume of the solution in the underflow is called the washing ratio R).

[0233] The detection data of the final concentrate and the final tailings obtained in this embodiment are shown in Table 4.

[0234] Table 4 Test results of the comprehensive beneficiation method in Example 2

[0235]

[0236] Example 3

[0237] For a copper mine in the Democratic Republic of the Congo, the copper grade of the original ore is 3.54% and the oxidation rate is 61.67%. The ore properties are complex. The copper oxide ore smelting products are recycled by the method of series concentration and regrinding flotation beneficiation. The specific method of this embodiment is as follows:

[0238] The copper oxide ore is classified according to the oxidation rate into: low-oxidation-rate copper oxide ore with an oxidation rate below 50% (the measured average copper grade is 3% - 3.5%), medium-oxidation-rate copper oxide ore with an oxidation rate of 50% - 75% (the measured average copper grade is 2% - 3%, and the content of acid-consuming carbonate gangue minerals is relatively high), and high-oxidation-rate copper oxide ore with an oxidation rate above 75% (the measured average copper grade is 3% - 4%, and the content of acid-consuming carbonate gangue minerals is relatively low).

[0239] (1) Treatment of low-oxidation-rate copper oxide ore:

[0240] The low-oxidation-rate copper oxide ore is ground to a particle size finer than 200 mesh, accounting for 69%. Then, rough selection of copper sulfide is carried out. The tailings obtained from the rough selection are subjected to scavenging of copper sulfide, and the concentrate obtained from the rough selection is subjected to cleaning of copper sulfide; the concentrate obtained from the scavenging of copper sulfide and the tailings obtained from the cleaning of copper sulfide are sent to the grinding process of high-oxidation-rate copper oxide ore; the concentrate obtained from the cleaning of copper sulfide is copper sulfide concentrate;

[0241] Rough selection of copper oxide is carried out on the scavenging tailings of copper sulfide from the low-oxidation-rate copper oxide ore. The concentrate obtained from the rough selection is high-grade copper oxide concentrate, and the tailings obtained from the rough selection are subjected to scavenging of copper oxide; the scavenging concentrate obtained from the scavenging of copper oxide is low-grade copper oxide concentrate; the scavenging tailings obtained from the scavenging of copper oxide enter the tailings pond as the final tailings of the solution of this embodiment.

[0242] Among them, the collector used for the beneficiation of low-oxidation-rate copper oxide ore is butyl xanthate, the frother is pine oil alcohol, and the sulfiding agent is sodium hydrosulfide;

[0243] Among them, the rough selection of copper sulfide is carried out once, the dosage of the collector is 100 g / t, and the dosage of the frother is 20 g / t;

[0244] Among them, the scavenging of copper sulfide is carried out once, the dosage of the collector is 50 g / t, and the dosage of the frother is 10 g / t;

[0245] Among them, the cleaning of copper sulfide is carried out five times, which is blank cleaning without adding reagents. The concentrates obtained from the first to the fourth cleaning enter the next cleaning, and the tailings obtained from each cleaning are sequentially returned;

[0246] Among them, the rough selection of copper oxide is carried out once, the dosage of the sulfiding agent is 1000 g / t, the dosage of the collector is 60 g / t, and the dosage of the frother is 10 g / t;

[0247] Among them, the scavenging of copper oxide is carried out twice, the total dosage of the sulfiding agent is 600 g / t, the total dosage of the collector is 30 g / t, and the total dosage of the frother is 10 g / t. The tailings obtained from the first scavenging are subjected to the second scavenging, and the concentrates obtained from the two scavengings are used as scavenging concentrates.

[0248] (2) Treatment of copper oxide ore with medium oxidation rate:

[0249] The medium oxidation rate copper oxide ore is ground to particles finer than 200 mesh, accounting for 68%. Coarse flotation of copper sulfide is carried out. The tailings obtained from the coarse flotation are subjected to scavenging of copper sulfide, and the concentrate obtained from the coarse flotation is subjected to cleaning of copper sulfide; The concentrate obtained from the scavenging of copper sulfide and the tailings obtained from the cleaning of copper sulfide are fed into the grinding process of high oxidation rate copper oxide ore; The concentrate obtained from the cleaning of copper sulfide is copper sulfide concentrate;

[0250] Coarse flotation of copper oxide is carried out on the scavenging tailings obtained from the scavenging of copper sulfide in the medium oxidation rate copper oxide ore. The concentrate obtained from the coarse flotation is high-grade copper oxide concentrate, and the tailings obtained from the coarse flotation are subjected to scavenging of copper oxide; The scavenging concentrate obtained from the scavenging of copper oxide is low-grade copper oxide concentrate; The scavenging tailings obtained from the scavenging of copper oxide enter the tailings pond as the final tailings of the solution in this embodiment.

[0251] Among them, the sulfiding agent used for the medium oxidation rate copper oxide ore dressing is sodium hydrosulfide, the collector is butyl xanthate, and the foaming agent is pine oil;

[0252] Among them, the coarse flotation of copper sulfide is carried out once, the dosage of the collector is 60 g / t, and the dosage of the foaming agent is 15 g / t;

[0253] Among them, the scavenging of copper sulfide is carried out once, the dosage of the collector is 30 g / t, and the dosage of the foaming agent is 10 g / t;

[0254] Among them, the cleaning of copper sulfide is carried out five times, which is blank cleaning without adding agents. The concentrates obtained from the first to the fourth cleaning enter the next cleaning process, and the tailings obtained from each cleaning are sequentially returned;

[0255] Among them, the coarse flotation of copper oxide is carried out once, the dosage of the sulfiding agent is 3000 g / t, the dosage of the collector is 150 g / t, and the dosage of the foaming agent each time is 10 g / t;

[0256] Among them, the scavenging of copper oxide is carried out six times. The dosage of the sulfiding agent each time is 800 g / t, the dosage of the collector each time is 70 g / t, and the dosage of the foaming agent each time is 5 g / t; The tailings obtained from the first to the fifth scavenging are subjected to the next scavenging, and the concentrate obtained from each scavenging is used as the scavenging concentrate.

[0257] (3) Treatment of the obtained high-grade copper oxide concentrate and low-grade copper oxide concentrate:

[0258] Acid leaching is carried out on the high-grade copper oxide concentrate. The obtained leaching residue is diluted with water to a pulp concentration of 70%, and mixed and slurried with the low-grade copper oxide concentrate concentrated to a pulp concentration of 70%, and then fed into the grinding process of high oxidation rate copper oxide ore;

[0259] The specific method of acid leaching is as follows: The pH value of the pulp is adjusted to 1.5 by using concentrated sulfuric acid to leach high-grade copper oxide concentrate; the conditions for acid leaching of the high-grade copper oxide concentrate are a pulp concentration of 15 wt% and a leaching time of 7 h.

[0260] After acid leaching and dilution of the high-grade copper oxide concentrate, the measured pH value is 4.2; after concentration of the low-grade copper oxide concentrate, the measured pH value is 10; after mixing and pulp adjustment, the pH value of the obtained mixed pulp is 7.3.

[0261] (4) Treatment of high oxidation rate copper oxide ore:

[0262] The high oxidation rate copper oxide ore (as well as the concentrate obtained from the scavenging of copper sulfide in each process, the tailings obtained from the cleaning of copper sulfide in each process, the high-grade copper oxide concentrate, and the mixed pulp obtained after the treatment of the low-grade copper oxide concentrate) is ground to a particle size finer than 200 mesh accounting for 86%, and rough selection of copper sulfide is carried out. The tailings obtained from the rough selection are subjected to scavenging of copper sulfide, and the concentrate obtained from the rough selection is subjected to cleaning of copper sulfide; the concentrate obtained from the scavenging of copper sulfide and the tailings obtained from the cleaning of copper sulfide are returned to the grinding process of the high oxidation rate copper oxide ore; the concentrate obtained from the cleaning of copper sulfide is the copper sulfide concentrate.

[0263] Among them, the collector used for the beneficiation of high oxidation rate copper oxide ore is butyl xanthate, and the foaming agent is pine oil;

[0264] Among them, the rough selection of copper sulfide is carried out once, the dosage of the collector is 200 g / t, and the dosage of the foaming agent is 20 g / t;

[0265] Among them, the scavenging of copper sulfide is carried out twice, the dosage of the collector each time is 100 g / t, and the dosage of the foaming agent each time is 10 g / t; the tailings from the first scavenging are subjected to the second scavenging, and the concentrate obtained from each scavenging is sequentially returned;

[0266] Among them, the cleaning of copper sulfide is carried out five times, which is a blank cleaning without adding reagents. The concentrate obtained from the first to the fourth cleanings enters the next cleaning, and the tailings obtained from each cleaning are sequentially returned.

[0267] The scavenging tailings (high copper tailings) obtained from the scavenging of copper sulfide in the high oxidation rate copper oxide ore are acid leached, and the slag is subjected to countercurrent washing. The copper metal in the washing liquid finally enters the leaching solution for recovery, obtaining the leaching solution and the leaching residue; the leaching residue enters the tailings pond as the final tailings of this embodiment; among them, the specific method of acid leaching is as follows: The pH value of the pulp is adjusted to 1.5 by using concentrated sulfuric acid, the concentration of the pulp is 15 wt%, and the leaching time is 7 h; the washing equipment for countercurrent washing is a thickener, the number of washing times is 5 times, and the countercurrent washing ratio of the thickener is 1.5 (the ratio of the volume of the additional washing water outside the thickener to the volume of the solution in the underflow is called the washing ratio R).

[0268] The detection data of the final concentrate and the final tailings obtained in this embodiment are shown in Table 5.

[0269] Table 5 Test results of the comprehensive ore dressing method in Example 3

[0270]

Claims

1. A method for serial flow centralized regrinding and flotation separation of copper oxide ore dressing products, characterized in that The copper grade of the raw ore is below 5 wt%, and the copper oxide ore is classified according to the oxidation rate into: low-oxidation-rate copper oxide ore with an oxidation rate below 50 wt%, medium-oxidation-rate copper oxide ore with an oxidation rate of 50 wt% to 75 wt%, and high-oxidation-rate copper oxide ore with an oxidation rate above 75 wt%. After grinding the low-oxidation-rate copper oxide ore, rough selection of copper sulfide is carried out. The tailings obtained from the rough selection are subjected to scavenging of copper sulfide, and the concentrate obtained from the rough selection is subjected to cleaning of copper sulfide; the concentrate obtained from the scavenging of copper sulfide and the tailings obtained from the cleaning of copper sulfide are sent to the grinding process of the high-oxidation-rate copper oxide ore; the concentrate obtained from the cleaning of copper sulfide is the copper sulfide concentrate; the low-oxidation-rate copper oxide ore is ground to a particle size finer than 200 mesh accounting for 65 wt% to 75 wt%. After grinding the medium-oxidation-rate copper oxide ore, rough selection of copper sulfide is carried out. The tailings obtained from the rough selection are subjected to scavenging of copper sulfide, and the concentrate obtained from the rough selection is subjected to cleaning of copper sulfide; the concentrate obtained from the scavenging of copper sulfide and the tailings obtained from the cleaning of copper sulfide are sent to the grinding process of the high-oxidation-rate copper oxide ore; the concentrate obtained from the cleaning of copper sulfide is the copper sulfide concentrate; the medium-oxidation-rate copper oxide ore is ground to a particle size finer than 200 mesh accounting for 65 wt% to 75 wt%. After grinding the high-oxidation-rate copper oxide ore, rough selection of copper sulfide is carried out. The tailings obtained from the rough selection are subjected to scavenging of copper sulfide, and the concentrate obtained from the rough selection is subjected to cleaning of copper sulfide; the concentrate obtained from the scavenging of copper sulfide and the tailings obtained from the cleaning of copper sulfide are returned to the grinding process of the high-oxidation-rate copper oxide ore; the concentrate obtained from the cleaning of copper sulfide is the copper sulfide concentrate; the high-oxidation-rate copper oxide ore is ground to a particle size finer than 200 mesh accounting for more than 80 wt%.

2. The method for series-flow centralized regrinding and flotation separation of copper oxide ore dressing products according to claim 1, characterized in that, Rough selection of copper oxide is carried out on the scavenging tailings obtained from the scavenging of copper sulfide in the low-oxidation-rate copper oxide ore. The concentrate obtained from the rough selection is high-grade copper oxide concentrate, and the tailings obtained from the rough selection are subjected to scavenging of copper oxide; the scavenging concentrate obtained from the scavenging of copper oxide is low-grade copper oxide concentrate; the scavenging tailings obtained from the scavenging of copper oxide enter the tailings pond. Rough selection of copper oxide is carried out on the scavenging tailings obtained from the scavenging of copper sulfide in the medium-oxidation-rate copper oxide ore. The concentrate obtained from the rough selection is high-grade copper oxide concentrate, and the tailings obtained from the rough selection are subjected to scavenging of copper oxide; the scavenging concentrate obtained from the scavenging of copper oxide is low-grade copper oxide concentrate; the scavenging tailings obtained from the scavenging of copper oxide enter the tailings pond.

3. The method for beneficiating copper oxide ore dressing products by series-flow centralized regrinding and flotation beneficiation according to claim 2, characterized in that, The high-grade copper oxide concentrate is subjected to acid leaching. The leaching residue obtained is diluted with water, mixed and slurried with the concentrated low-grade copper oxide concentrate, and sent to the grinding process of the high-oxidation-rate copper oxide ore.

4. The method for serial-flow centralized regrinding and flotation separation of copper oxide ore dressing products according to claim 3, wherein, The pH value of the pulp is adjusted to 1.5 - 2 by using concentrated sulfuric acid to leach the high-grade copper oxide concentrate; the conditions for acid leaching of the high-grade copper oxide concentrate are a pulp concentration of 10 wt% - 20 wt% and a leaching time of 6 - 9 h. The leaching residue obtained from the acid leaching of the high-grade copper oxide concentrate is diluted to a pulp concentration of 60 wt% - 70 wt%. The low-grade copper oxide concentrate is concentrated to a pulp concentration of 60 wt% - 70 wt%. The mixing and slurrying is: adjusting the pH value of the pulp to 6.5 - 7.

5.

5. The method for serial flow concentration regrinding flotation separation of copper oxide ore dressing products according to claim 1, wherein The scavenging tailings obtained from scavenging copper sulfide in the high oxidation rate copper oxide ore are subjected to acid leaching, and the residue is subjected to countercurrent washing to obtain a leaching solution and a leaching residue.

6. The copper oxide ore beneficiation method of string-flow centralized regrinding and flotation for smelting products according to any one of claims 1 to 5, characterized in that, The concentration of copper sulfide is carried out one or more than two times; when the concentration of copper sulfide is more than two times, the middlings are sequentially returned. The scavenging of copper sulfide is carried out one or more than two times; when the scavenging of copper sulfide is more than two times, the middlings are sequentially returned.

7. The method for series-flow centralized regrinding and flotation separation of copper oxide ore dressing products according to any one of claims 2 to 4, characterized in that, The scavenging of copper oxide is carried out one or more than two times; when the scavenging of copper oxide is more than two times, the concentrate obtained each time is used as the scavenging concentrate.

8. The method for series-flow centralized regrinding and flotation separation of copper oxide ore dressing products according to claim 1, characterized in that, The copper grade of the raw ore is 2wt% - 4wt%, and the oxidation rate is 30wt% - 95wt%. The low oxidation rate copper oxide ore is ground to particles finer than 200 mesh accounting for 68wt% - 71wt%. The medium oxidation rate copper oxide ore is ground to particles finer than 200 mesh accounting for 68wt% - 73wt%. The high oxidation rate copper oxide ore is ground to particles finer than 200 mesh accounting for 85wt% - 90wt%.

9. The method for series-flow centralized regrinding and flotation separation of copper oxide ore dressing products according to claim 1 or 8, characterized in that, The collector used for the beneficiation of the low oxidation rate copper oxide is butyl xanthate. The frother used for the beneficiation of the low oxidation rate copper oxide is pine oil. The collector used for the beneficiation of the medium oxidation rate copper oxide is butyl xanthate. The frother used for the beneficiation of the medium oxidation rate copper oxide is pine oil. The collector used for the beneficiation of the high oxidation rate copper oxide is butyl xanthate. The frother used for the beneficiation of the high oxidation rate copper oxide is pine oil. In the roughing of copper sulfide in the low oxidation rate copper oxide, the total dosage of the collector is 50 - 100g / t. In the roughing of copper sulfide in the low oxidation rate copper oxide, the total dosage of the frother is 10 - 20g / t. In the scavenging of copper sulfide in the low oxidation rate copper oxide, the total dosage of the collector is 20 - 50g / t. In the scavenging of copper sulfide in the low oxidation rate copper oxide, the total dosage of the frother is 5 - 10g / t. In the roughing of copper sulfide in the medium oxidation rate copper oxide, the dosage of the collector each time is 30 - 60g / t. In the roughing of copper sulfide in the medium oxidation rate copper oxide, the dosage of the frother each time is 10 - 15g / t. In the scavenging of copper sulfide in the medium oxidation rate copper oxide, the dosage of the collector each time is 10 - 30g / t. In the scavenging of copper sulfide in the medium oxidation rate copper oxide, the dosage of the frother each time is 5 - 10g / t. In the roughing of copper sulfide in the high oxidation rate copper oxide, the dosage of the collector each time is 100 - 200g / t. In the roughing of copper sulfide in the high oxidation rate copper oxide, the dosage of the frother each time is 10 - 20g / t. In the scavenging of copper sulfide in the high oxidation rate copper oxide, the dosage of the collector each time is 50 - 100g / t. In the scavenging of copper sulfide in the high oxidation rate copper oxide, the dosage of the frother each time is 5 - 10g / t.

10. The method for serial flow centralized regrinding and flotation separation of copper oxide ore dressing products according to claim 2 or 8, characterized in that, The collector used for the beneficiation of the low oxidation rate copper oxide is butyl xanthate. The frother used for the beneficiation of the low oxidation rate copper oxide is pine oil. The sulfiding agent used for the beneficiation of the low oxidation rate copper oxide is sodium hydrosulfide. The collector used for the beneficiation of the medium oxidation rate copper oxide is butyl xanthate. The frother used for the beneficiation of the medium oxidation rate copper oxide is pine oil. The sulfiding agent used for the beneficiation of the medium oxidation rate copper oxide is sodium hydrosulfide. In the rougher flotation of the low oxidation rate cupric oxide, the total dosage of the sulfurizing agent is 600 - 1200 g / t; In the rougher flotation of the low oxidation rate cupric oxide, the total dosage of the collector is 30 - 80 g / t; In the rougher flotation of the low oxidation rate cupric oxide, the total dosage of the frother is 5 - 10 g / t; In the scavenger flotation of the low oxidation rate cupric oxide, the total dosage of the sulfurizing agent is 200 - 600 g / t; In the scavenger flotation of the low oxidation rate cupric oxide, the total dosage of the collector is 10 - 40 g / t; In the scavenger flotation of the low oxidation rate cupric oxide, the total dosage of the frother is 5 - 10 g / t; In the rougher flotation of the medium oxidation rate cupric oxide, the dosage of the sulfurizing agent each time is 2000 - 3500 g / t; In the rougher flotation of the medium oxidation rate cupric oxide, the dosage of the collector each time is 100 - 150 g / t; In the rougher flotation of the medium oxidation rate cupric oxide, the dosage of the frother each time is 5 - 10 g / t; In the scavenger flotation of the medium oxidation rate cupric oxide, the dosage of the sulfurizing agent each time is 300 - 1500 g / t; In the scavenger flotation of the medium oxidation rate cupric oxide, the dosage of the collector each time is 20 - 70 g / t; In the scavenger flotation of the medium oxidation rate cupric oxide, the dosage of the frother each time is 0 - 5 g / t.

Images