Flotation process for copper ores with high oxidation rate

Abstract

This invention discloses a flotation process for high-oxidation-rate copper ore, comprising: staged flotation of copper sulfide and copper oxide to obtain copper sulfide and easily floatable copper oxide concentrates; then flotation desliming to obtain low-grade copper-bearing slime; and stepwise flotation of copper oxide after desliming to obtain copper oxide concentrate. This invention adds a sulfiding agent during the grinding process to activate the copper oxide before flotation, improving its floatability. During the copper sulfide flotation process, both copper sulfide and easily activated copper oxide float, resulting in copper sulfide and easily floatable copper oxide concentrates. High-oxidation-rate copper ore contains easily floatable copper sulfide and easily floatable, moderately floatable, and difficult-to-float copper oxides. This invention, during the flotation process, stages activation and separation of easily floatable, moderately floatable, and difficult-to-float copper oxides, avoiding the inhibitory effect of excessive sodium hydrosulfide on some copper minerals and improving the recovery rate of these copper minerals.

Description

Technical Field

[0001] This invention relates to the field of mineral processing technology, and in particular to a flotation process for copper ore with a high oxidation rate. Background Technology

[0002] The beneficiation methods for oxidized copper ores mainly include flotation and chemical beneficiation. Among flotation methods, sulfide flotation is currently the most widely used and common method for processing oxidized copper ores and mixed copper ores. The existing flotation process includes: after crushing and grinding, the qualified product of high-oxidation copper ore enters a stirred tank. During the stirring process, collectors and frothers are added, and sulfide copper flotation is performed first to obtain sulfide copper concentrate. The tailings after sulfide copper flotation enter a copper oxide slurry stirred tank. Activators, collectors, and frothers are added in the stirred tank to perform copper oxide flotation to obtain copper oxide concentrate. The flotation tailings are then concentrated in a thickener and transported to a tailings dam for storage.

[0003] The above process has the following drawbacks: Due to the high oxidation rate and large mud content of the ore, a large amount of activator such as sodium hydrosulfide needs to be added during the copper oxide flotation process, which increases the beneficiation cost. Furthermore, after adding a large amount of sodium hydrosulfide, the pH value of the pulp is high, reaching above 11, which inhibits the floatability of some easily floatable copper oxides, preventing these copper oxides from floating and being recovered, resulting in resource waste as they are lost to the tailings. Summary of the Invention

[0004] This invention provides a flotation process for copper ore with high oxidation rate to solve the technical problems of increased cost and loss of copper oxide resources due to the large amount of activators such as sodium hydrosulfide added in existing flotation processes.

[0005] This invention provides a flotation process for high-oxidation-rate copper ore, comprising the following steps:

[0006] (1) Grinding: High oxidation rate copper ore is ground, and a sulfiding agent is added during the grinding process to obtain raw ore slurry;

[0007] (2) Copper sulfide flotation: Collector and frother are added to the raw ore slurry for a first roughing process to obtain copper sulfide rough concentrate and copper sulfide roughing tailings.

[0008] The obtained copper sulfide crude concentrate is subjected to N refining processes to obtain copper sulfide concentrate and refined tailings N. The refined tailings N are returned and combined with the copper sulfide concentrate (N-2), where N is a positive integer greater than or equal to 3.

[0009] The obtained copper sulfide roughing tailings are subjected to a first scavenging process to obtain copper sulfide scavenging foam I and copper sulfide flotation tailings. The obtained copper sulfide scavenging foam I is returned to the original ore slurry.

[0010] (3) Desliming flotation: Add frother to the obtained copper sulfide flotation tailings and carry out fine mud flotation to obtain copper-bearing mud and deslimed slurry;

[0011] (4) Copper oxide flotation: Tailings concentrate water is added to the obtained deslimed slurry for slurry conditioning;

[0012] Sulfidating agent, collector and frother are added to the obtained slurry after conditioning for the first roughing process, and then sulfidating agent, collector and frother are added again for at least one scavenging process to obtain copper oxide concentrate I and copper oxide scavenging tailings I.

[0013] A second roughing process is carried out by adding sulfidating agent, collector and frother to the obtained copper oxide scavenging tailings I, followed by adding sulfidating agent, collector and frother for at least one more scavenging process to obtain copper oxide concentrate II, final tailings and tailings concentrate water.

[0014] Furthermore, the sulfiding agent mentioned in steps (1) and (4) is a mixture of sodium hydrosulfide and sodium sulfide in a mass ratio of 1:1.

[0015] Furthermore, in steps (2) to (4), the collector is butyl xanthate and the foaming agent is pine oil.

[0016] Furthermore, in step (1), the content of the particle size with a grinding fineness of -0.074 mm is 70%-75%.

[0017] Furthermore, the amount of vulcanizing agent used in step (1) is 100-180 g / t.

[0018] Furthermore, in step (2), the amount of collector used is 80-120 g / t, the amount of frother used is 10-20 g / t, and the flotation concentration is 38%-40%.

[0019] Furthermore, in step (2), when the obtained copper sulfide crude concentrate is cleaned N times, when the first cleaning is completed, the obtained copper sulfide concentrate I enters the second cleaning, and the cleaned tailings I are returned to be combined with the original ore slurry; when the second cleaning is completed, the copper sulfide concentrate II enters the third cleaning, and the cleaned tailings II are returned to be combined with the copper sulfide crude concentrate.

[0020] Furthermore, in step (3), the amount of foaming agent used is 10-20 g / t.

[0021] Furthermore, the tailings concentrate obtained in step (4) is returned to the deslimed slurry to adjust the slurry concentration to 30-32%.

[0022] Furthermore, in step (4), during the first and second roughing processes, after adding the sulfiding agent, collector, and foaming agent, the mixture is stirred for 5 to 10 minutes.

[0023] The present invention has the following beneficial effects:

[0024] This invention introduces a sulfiding agent during the grinding process to activate copper oxide before flotation, thereby improving its floatability. During copper sulfide flotation, both copper sulfide and easily activated copper oxide float to the surface, yielding a concentrate of copper sulfide and easily floatable copper oxide. By desliming during flotation, the flotation environment of the pulp is optimized, effectively solving the problems of poor concentrate grade, low recovery rate, and high reagent consumption caused by mud covering and competitive adsorption during copper oxide flotation.

[0025] This invention places the flotation desliming process after copper sulfide flotation and before copper oxide flotation. If desliming occurs before copper sulfide flotation (i.e., after grinding), the resulting fine slime contains some copper sulfide minerals, which cannot be leached in the subsequent acid leaching process, affecting the recovery of copper minerals from the slime. This invention, by desliming after copper sulfide flotation and before copper oxide flotation, results in a lower copper sulfide content in the fine slime, leading to a higher copper mineral leaching rate during acid leaching and improving the recovery of copper minerals from the fine slime.

[0026] This invention involves preparing the flotation slurry before copper oxide flotation. This improves selectivity for copper oxide flotation at lower concentrations and reduces the impact of residual slime from the desliming process. Using the recycled water from the concentrated flotation tailings for slurry preparation in copper oxide flotation helps conserve the amount of sulfiding agent used, as the recycled water contains a large amount of sulfiding agent.

[0027] This invention separates copper sulfide and copper oxides that are easy to float, moderately floatable, and difficult to float in stages. First, copper sulfide and easy-to-float copper oxide minerals are floated, then moderately floatable copper oxides are floated, and finally difficult-to-float copper oxides are floated.

[0028] In step (2) of this invention, in addition to recovering copper sulfide, some easily floatable copper oxides are also recovered, such as easily floatable malachite and cuprite.

[0029] In step (4) of this invention, a sulfiding agent is added during the first stirring process to control the slurry pH to 8-9, thereby activating the copper oxide and recovering the easily floatable and moderately floatable copper oxide minerals, such as chalcanthite, that were not fully recovered in step (2) by flotation. During the second stirring process, a sulfiding agent is added to control the slurry pH to 9-10 to recover the difficult-to-float copper oxide minerals, such as copper-cobalt manganese ore.

[0030] In step (4) of this invention, a small amount of sulfiding agent is added at the beginning, which avoids the inhibition of some copper oxide caused by adding a large amount of sulfiding agent at one time to increase the pH value of the slurry, resulting in a decrease in the copper oxide recovery rate.

[0031] In step (4) of this invention, by utilizing the concentrated tailings water and adding chemicals in stages, the amount of sulfiding agent can be reduced by 10%-15%, and the copper recovery rate can be increased by about 10%.

[0032] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0033] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0034] Figure 1 This is a flow chart of the flotation process for high-oxidation-rate copper ore according to a preferred embodiment of the present invention;

[0035] Figure 2 This is a flow chart of the flotation process for high-oxidation-rate copper ore, which is Comparative Example 5 of this invention. Detailed Implementation

[0036] To make the inventive objectives, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the embodiments described in this specification are merely illustrative of the invention and are not intended to limit the invention.

[0037] For simplicity, this paper only explicitly discloses some numerical ranges. However, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, just as any upper limit can be combined with any other upper limit to form an unspecified range. Furthermore, although not explicitly stated, every point or individual value between the endpoints of a range is included within that range. Therefore, each point or individual value can serve as its own lower or upper limit and be combined with any other point or individual value, or with other lower or upper limits, to form an unspecified range.

[0038] In this description, it should be noted that, unless otherwise stated, "above" and "below" include the stated number, "multiple" in "one or more" means two or more, and "more than" in "one or more" means two or more.

[0039] Embodiments of the present invention provide a flotation process for high-oxidation-rate copper ore, comprising the following steps:

[0040] (1) Grinding: High oxidation rate copper ore is ground, and a sulfiding agent is added during the grinding process to obtain raw ore slurry;

[0041] (2) Copper sulfide flotation: Collector and frother are added to the raw ore slurry for a first roughing process to obtain copper sulfide rough concentrate and copper sulfide roughing tailings.

[0042] The obtained copper sulfide crude concentrate is subjected to N refining processes to obtain copper sulfide concentrate and refined tailings N. The refined tailings N are then returned and combined with the copper sulfide concentrate (N-2), where N is a positive integer greater than or equal to 3.

[0043] The obtained copper sulfide roughing tailings are subjected to a first scavenging process to obtain copper sulfide scavenging foam I and copper sulfide flotation tailings. The obtained copper sulfide scavenging foam I is returned to the original ore slurry.

[0044] (3) Desliming flotation: Add frother to the obtained copper sulfide flotation tailings and carry out fine mud flotation to obtain copper-bearing mud and deslimed slurry;

[0045] (4) Copper oxide flotation: Tailings concentrate water is added to the obtained deslimed slurry for slurry conditioning;

[0046] Sulfidating agent, collector and frother are added to the obtained slurry after conditioning for the first roughing process, and then sulfidating agent, collector and frother are added again for at least one scavenging process to obtain copper oxide concentrate I and copper oxide scavenging tailings I.

[0047] A second roughing process is carried out by adding sulfidating agent, collector and frother to the obtained copper oxide scavenging tailings I, followed by adding sulfidating agent, collector and frother for at least one more scavenging process to obtain copper oxide concentrate II, final tailings and tailings concentrate water.

[0048] In an embodiment of the present invention, N in step (2) can be 3, 4, 5 or other positive integers greater than 5.

[0049] In embodiments of the present invention, copper sulfide and copper oxide are floated in stages according to the ore properties to obtain copper sulfide and easily floatable copper oxide concentrates. Then, desliming is performed by flotation to obtain low-grade copper-bearing slime. After desliming, copper oxide is floated in stages to obtain copper oxide concentrate. Small amounts of copper sulfide minerals (mainly chalcocite) and easily floatable, moderately floatable, and partially difficult-to-float copper oxide minerals, mainly malachite, cobalt-containing malachite, etc., are recovered from the high-oxidation-rate copper ore.

[0050] The flotation process provided in this invention has the following advantages:

[0051] 1. Staged flotation: High-oxidation copper ore contains easily floatable copper sulfide and easily floatable, moderately floatable, and difficult-to-float copper oxide. During the flotation process, the easily floatable, moderately floatable, and difficult-to-float copper oxide are activated and separated in stages. This avoids the inhibitory effect of excessive sodium hydrosulfide on some copper minerals and improves the recovery rate of these copper minerals.

[0052] 2. Flotation Desliming: High-oxidation-rate copper ore contains a large amount of fine-grained slime. The main effects of slime on the flotation recovery of copper oxide are: increased reagent consumption; reduced flotation speed; contamination of froth products; reduced quality of copper oxide concentrate; and increased loss of copper oxide metal. The main reasons for this effect are as follows: (1) Due to the large surface energy of slime, under certain conditions, slime of different components forms non-selective agglomeration. The agglomeration phenomenon caused by surface force will also cause slime to adhere to the surface of coarse particles, forming a fine-grained cover, which reduces the flotation recovery rate. (2) Due to the large specific surface area and surface energy of slime, it has a high reagent adsorption capacity and poor adsorption selectivity, resulting in an increase in reagent consumption. (3) The contact rate and adhesion efficiency between slime and bubbles decrease, which reduces the capture rate of particles by bubbles. At the same time, slime will also adhere to the surface of bubbles in large quantities, forming the so-called bubble "armor" phenomenon, affecting the carrying capacity of bubbles and reducing the flotation recovery effect.

[0053] This invention places the desliming process after the flotation of copper sulfide and easily activated copper oxide for the following two reasons: (1) Laboratory tests and production practice have shown that desliming or not desliming has little effect on the concentrate grade and recovery rate of copper sulfide flotation. (2) Desliming before copper sulfide flotation, i.e. after grinding, results in the removal of some copper sulfide minerals in the fine mud, which cannot be leached in the subsequent acid leaching process, affecting the recovery of copper minerals in the fine mud. Desliming after copper sulfide flotation results in less copper sulfide in the fine mud, leading to a higher leaching rate of copper minerals during acid leaching, thus improving the recovery of copper minerals in the fine mud. Desliming through flotation reduces the impact of fine mud on subsequent flotation, reduces reagent consumption, and improves the effect of sulfiding agents on copper oxide minerals. The removed ore mud directly enters the subsequent smelting acid leaching process.

[0054] 3. Optimization of Flotation Concentration: Copper sulfide minerals have good floatability, and higher concentrations are beneficial for improving recovery rates. Copper oxide minerals have poor floatability, and lower concentrations can improve selectivity and reduce the impact of unremoved slime from the desliming process on copper oxide flotation. In production practice, the optimal concentration for copper sulfide flotation is found to be 38%-40%, and for copper oxide flotation, 30%-32%. Appropriately reducing the copper oxide flotation concentration after copper sulfide flotation is beneficial for improving copper oxide flotation efficiency. Using the recycled water from the concentrated flotation tailings for copper oxide flotation slurry preparation, which contains a large amount of sulfiding agent, helps save on sulfiding agent usage.

[0055] 4. Recycling of tailings water: A large amount of sulfiding agent is used to activate copper oxide during the flotation process, resulting in a high content of sulfiding agent in the recycled water after the flotation tailings are concentrated. By utilizing the recycled water from the tailings, the amount of sulfiding agent used is reduced, the beneficiation cost is reduced, and the economical and efficient utilization of copper ore with high oxidation rate is achieved.

[0056] In the embodiments of the present invention, the sulfiding agent mentioned in steps (1) and (4) is a mixture of sodium hydrosulfide and sodium sulfide in a mass ratio of 1:1. Flotation tests were conducted on sodium hydrosulfide and sodium sulfide alone, as well as mixtures of the two in different proportions, as sulfiding agents for high-oxidation-rate copper ores. The best sulfidation effect on high-oxidation-rate copper ores was observed when sodium hydrosulfide and sodium sulfide were used in a 1:1 mass ratio.

[0057] In the embodiments of the present invention, the collector in steps (2) to (4) is butyl xanthate; the foaming agent is pine oil.

[0058] In an embodiment of the present invention, the content of the grinding fineness of -0.074 mm in step (1) is 70%-75%. In the flotation test of high oxidation rate copper ore, the flotation effect is best when the content of the grinding fineness of -0.074 mm is 70%-75%.

[0059] In the embodiments of the present invention, the amount of sulfiding agent used in step (1) is 100-180 g / t. In the flotation test of high oxidation rate copper ore, the flotation effect is best when the amount of sulfiding agent is 100-180 g / t. When the amount is lower than this, the copper recovery rate decreases, and when the amount is higher than this, the grade of copper sulfide concentrate decreases.

[0060] In an embodiment of the present invention, the amount of collector used in step (2) is 80-120 g / t, the amount of frother used is 10-20 g / t, and the flotation concentration is 38%-40%.

[0061] In the embodiments of the present invention, when the obtained copper sulfide crude concentrate is cleaned N times in step (2), when the first cleaning is completed, the obtained copper sulfide concentrate I enters the second cleaning, and the obtained cleaned tailings I is returned to be combined with the original ore slurry; when the second cleaning is completed, the copper sulfide concentrate II enters the third cleaning, and the cleaned tailings II are returned to be combined with the copper sulfide crude concentrate, which is beneficial to improving the grade of copper sulfide concentrate and the copper sulfide recovery effect.

[0062] In the embodiments of the present invention, the amount of frother used in step (3) is 10-20 g / t. The frother forms a large amount of stable foam during the desliming process, which floats the easily floating sludge. When the amount of frother used is small, less foam is formed and the desliming effect is poor. When the amount of frother used is large, it is easy to cause the sludge to run off the tank, which affects the flotation effect in step (4).

[0063] In an embodiment of the present invention, the tailings concentrate water obtained in step (4) is returned to the deslimed slurry to adjust the slurry concentration to 30-32%.

[0064] According to an embodiment of the present invention, the pulp concentration is reduced from 38%-40% to 30%-32% before copper oxide flotation. This reduces the selectivity of copper oxide flotation at lower concentrations and decreases the impact of unremoved slime during the flotation desliming process on copper oxide flotation.

[0065] In an embodiment of the present invention, during the first and second roughing processes in step (4), a sulfiding agent, a collector, and a frother are added to the stirred tank and stirred for 5-10 minutes. This promotes the interaction between the slurry and flotation reagents, shortens the slurry conditioning time, and saves reagent usage. The amount of scavenging reagent added subsequently is small, serving as a supplement to the reagents consumed in the roughing process. Considering the economic efficiency and complexity of the flotation process, no additional stirred tank is added for further stirring.

[0066] In some embodiments, such as Figure 1 As shown, the flotation process for high-oxidation-rate copper ore includes the following steps:

[0067] (1) Grinding: High oxidation rate copper ore is ground, and a sulfiding agent is added during the grinding process to obtain raw ore slurry.

[0068] (2) Copper sulfide flotation: ① Collector and frother are added to the raw ore slurry for a first roughing process to obtain copper sulfide rough concentrate and copper sulfide rough tailings; ② The copper sulfide rough concentrate is subjected to a first cleaning process to obtain copper sulfide concentrate I and cleaned tailings I. Cleaned tailings I are returned to the raw ore slurry and combined to form a closed-loop cycle; ③ Copper sulfide concentrate I is subjected to a second cleaning process to obtain copper sulfide concentrate II and cleaned tailings II. Cleaned tailings II are returned to the copper sulfide rough concentrate and combined to form a closed-loop cycle; ④ Copper sulfide concentrate II is subjected to a third cleaning process. The process involves several steps: 1) Copper sulfide concentrate III and refined tailings III are obtained. Refined tailings III are returned and combined with copper sulfide concentrate I to form a closed-loop cycle. 2) Copper sulfide concentrate III undergoes four refinements to obtain copper sulfide concentrate IV and refined tailings IV. Refined tailings IV are returned and combined with copper sulfide concentrate II to form a closed-loop cycle. 3) Copper sulfide concentrate IV undergoes five refinements to obtain copper sulfide concentrate V and refined tailings V. Copper sulfide concentrate V is the final copper sulfide concentrate, and refined tailings V are returned and combined with copper sulfide concentrate III to form a closed-loop cycle. 4) The roughing tailings of copper sulfide undergo one scavenging process to obtain copper sulfide scavenging froth I and copper sulfide first-scavenging tailings I. Copper sulfide scavenging froth I is returned to the original ore slurry to form a closed-loop cycle, and copper sulfide first-scavenging tailings I is copper sulfide flotation tailings.

[0069] (3) Desliming flotation: Add a frother to the copper sulfide flotation tailings obtained in step (2) and carry out fine mud flotation to obtain copper-bearing mud and deslimed slurry.

[0070] (4) Copper oxide flotation: ① Add tailings concentrate to the deslimed slurry obtained in step (3) to adjust the slurry concentration to 30%, then add sulfiding agent, collector, and frother, stir for 5 minutes, and carry out copper oxide roughing I to obtain copper oxide roughing concentrate I and copper oxide roughing tailings I; ② Add sulfiding agent, collector, and frother to copper oxide roughing tailings I and carry out copper oxide scavenging II to obtain copper oxide scavenging concentrate II and copper oxide scavenging tailings II, and combine copper oxide scavenging concentrate II with copper oxide roughing concentrate I; ③ Add sulfiding agent, collector, and frother to copper oxide scavenging tailings II and carry out copper oxide scavenging I-II to obtain copper oxide scavenging concentrate I-II and copper oxide scavenging tailings-II, and combine copper oxide scavenging concentrate I-II with copper oxide roughing concentrate I; ④ Add Add sulfiding agent, collector, and frother to copper oxide scavenging tailings I-II, stir for 5 minutes, and perform copper oxide roughing II to obtain copper oxide roughing concentrate II and copper oxide roughing tailings II; ⑤ Add sulfiding agent, collector, and frother to copper oxide roughing tailings II, and perform copper oxide scavenging II-I to obtain copper oxide scavenging concentrate II-I and copper oxide scavenging tailings II-I, and combine copper oxide scavenging concentrate II-I with copper oxide roughing concentrate II; ⑥ Add sulfiding agent, collector, and frother to copper oxide scavenging tailings II-I, and perform copper oxide scavenging II-II to obtain copper oxide scavenging concentrate II-II and copper oxide scavenging tailings II-II, and combine copper oxide scavenging concentrate II-II with copper oxide roughing concentrate II, with copper oxide scavenging tailings II-II being the final tailings.

[0071] In step (4) of the above scheme, the amount of vulcanizing agent is 1000-2000g / t, the amount of collector is 100-150g / t, and the amount of foaming agent is 10-20g / t.

[0072] In step (4) of the above scheme, the amount of vulcanizing agent is 300-500g / t, the amount of collector is 50-100g / t, and the amount of foaming agent is 0-5g / t.

[0073] In step (4) of the above scheme, the amount of vulcanizing agent is 300-500g / t, the amount of collector is 20-30g / t, and the amount of foaming agent is 0-5g / t.

[0074] In step (4) of the above scheme, the amount of vulcanizing agent is 2000-3000g / t, the amount of collector is 50-100g / t, and the amount of foaming agent is 5-10g / t.

[0075] In step (4) of the above scheme, the amount of vulcanizing agent is 300-500g / t, the amount of collector is 20-30g / t, and the amount of foaming agent is 0-5g / t.

[0076] In step (4) of the above scheme, the amount of vulcanizing agent used is 300-500g / t, the amount of collector used is 20-30g / t, and the amount of foaming agent used is 0-5g / t.

[0077] Example

[0078] The following examples describe the disclosure of this invention in more detail. These examples are merely illustrative, as various modifications and variations will be apparent to those skilled in the art within the scope of this disclosure. Unless otherwise stated, all parts, percentages, and ratios reported in the following examples are based on weight, and all reagents used in the examples are commercially available or synthesized by conventional methods and can be used directly without further processing. The instruments used in the examples are also commercially available.

[0079] Example 1

[0080] like Figure 1 As shown, this embodiment 1 provides a flotation process for high-oxidation-rate copper ore, which is carried out according to the following steps:

[0081] (1) Grinding: The high oxidation rate copper ore is ground to a fineness of -0.074mm and a particle size content of 72%. Sulfidating agent is added during the grinding process at a dosage of 150g / t to obtain raw ore slurry with a slurry concentration of 38%.

[0082] (2) Copper sulfide flotation: ① Add butyl xanthate collector and rosin oil frother to the raw ore slurry at dosages of 80 g / t and 20 g / t, respectively, stir for 5 min, and perform a first roughing to obtain copper sulfide rough concentrate and copper sulfide rough tailings; ② Perform a first cleaning of the copper sulfide rough concentrate to obtain copper sulfide concentrate I and cleaned tailings I. Cleaned tailings I are returned and combined with the raw ore slurry to form a closed-loop cycle; ③ Perform a second cleaning of copper sulfide concentrate I to obtain copper sulfide concentrate II and cleaned tailings II. Cleaned tailings II are returned and combined with the copper sulfide rough concentrate to form a closed-loop cycle. ④ Copper sulfide concentrate II undergoes three cleaning processes to obtain copper sulfide concentrate III and cleaned tailings III. Cleaned tailings III are returned and combined with copper sulfide concentrate I to form a closed-loop cycle. ⑤ Copper sulfide concentrate III undergoes four cleaning processes to obtain copper sulfide concentrate IV and cleaned tailings IV. Cleaned tailings IV are returned and combined with copper sulfide concentrate II to form a closed-loop cycle. ⑥ Copper sulfide concentrate IV undergoes five cleaning processes to obtain copper sulfide concentrate V and cleaned tailings V. Copper sulfide concentrate V is the final copper sulfide concentrate. Cleaned tailings V are returned and combined with copper sulfide concentrate III to form a closed-loop cycle. ⑦ Copper sulfide roughing tailings undergo one scavenging process to obtain copper sulfide scavenging froth I and copper sulfide first-scavenging tailings I. Copper sulfide scavenging froth I is returned to the original ore slurry to form a closed-loop cycle. Copper sulfide first-scavenging tailings I is copper sulfide flotation tailings.

[0083] (3) Desliming and flotation: ① Add frother pine oil to the copper sulfide flotation tailings obtained in step (2) at a dosage of 10g / t, and carry out fine mud flotation to obtain copper-containing mud and deslimed slurry.

[0084] (4) Copper oxide flotation: ① Add tailings concentrate to the deslimed slurry obtained in step (3) to adjust the slurry concentration to 30%, then add sulfiding agent at a dosage of 1500 g / t, and add collector butyl xanthate and frother pine oil at dosages of 120 g / t and 20 g / t respectively. Stir for 5 min to carry out copper oxide roughing I, and obtain copper oxide roughing concentrate I and copper oxide roughing tailings I; ② Add sulfiding agent to copper oxide roughing tailings I at a dosage of 400 g / t, and add collector butyl xanthate and frother pine oil at dosages of 3 g / t and 400 g / t respectively. 0 g / t, 5 g / t, copper oxide scavenging II is carried out to obtain copper oxide scavenging concentrate II and copper oxide scavenging tailings II. Copper oxide scavenging concentrate II is combined with copper oxide roughing concentrate I; ③ Add sulfiding agent to copper oxide scavenging tailings II at a dosage of 400 g / t, add collector butyl xanthate and frother pine oil at dosages of 30 g / t and 5 g / t respectively, and carry out copper oxide scavenging I-II to obtain copper oxide scavenging concentrate I-II and copper oxide scavenging tailings I-II. Copper oxide scavenging concentrate I-II is combined with copper oxide roughing concentrate I; ④ Add a sulfiding agent (2500 g / t) to copper oxide scavenging tailings I-II, along with collector butyl xanthate (30 g / t) and frother pine oil (5 g / t), and stir for 5 minutes. Perform copper oxide roughing II to obtain copper oxide roughing concentrate II and copper oxide roughing tailings II. Add a sulfiding agent (400 g / t) to copper oxide roughing tailings II, along with collector butyl xanthate (30 g / t) and frother pine oil (5 g / t), and perform copper oxide scavenging II-I to obtain copper oxide scavenging concentrate II. -I is combined with copper oxide scavenging tailings II-I, and copper oxide scavenging concentrate II-I is combined with copper oxide roughing concentrate II; ⑥ A sulfiding agent of 400 g / t is added to copper oxide scavenging tailings II-I, and collectors butyl xanthate and frother pine oil of 30 g / t and 5 g / t, respectively, to carry out copper oxide scavenging II-II, resulting in copper oxide scavenging concentrate II-II and copper oxide scavenging tailings II-II. The copper oxide scavenging concentrate II-II is combined with copper oxide roughing concentrate II, and copper oxide scavenging tailings II-II is the final tailings.

[0085] Comparative Example 1

[0086] In contrast, according to Figure 1 The beneficiation process shown in the flowchart grinds the raw ore to a fineness of -0.074mm with a particle size content of 72%. No sulfiding agent is added during the grinding process, and other conditions are the same as in Example 1.

[0087] For high-oxidation copper ore with an oxidation rate of 80.18% and a copper grade of 2.35%, the results of the two sets of conditional tests are shown in Table 1.

[0088] Table 1. Flotation test results of Example 1 and Comparative Example 1

[0089]

[0090] As shown in Table 1, compared with the conventional grinding process without adding sulfiding agent, the process provided by the present invention reduces the grade of copper sulfide concentrate by 0.97 percentage points, reduces the grade of copper oxide concentrate by 0.18 percentage points, and increases the total recovery rate of copper sulfide and copper oxide by 2.11 percentage points, with a significant increase in copper recovery rate.

[0091] Example 2

[0092] like Figure 1 As shown, this embodiment provides a flotation process for high-oxidation-rate copper ore, which is carried out according to the following steps:

[0093] (1) Grinding: The high oxidation rate copper ore is ground to a fineness of -0.074mm and a particle size content of 70%. Sulfidating agent is added during the grinding process at a dosage of 100g / t to obtain raw ore slurry with a slurry concentration of 40%.

[0094] (2) Copper sulfide flotation: ① Add butyl xanthate collector and rosin oil frother to the raw ore slurry at dosages of 80 g / t and 20 g / t, respectively, stir for 5 min, and perform a first roughing to obtain copper sulfide rough concentrate and copper sulfide rough tailings; ② Perform a first cleaning of the copper sulfide rough concentrate to obtain copper sulfide concentrate I and cleaned tailings I. Cleaned tailings I are returned and combined with the raw ore slurry to form a closed-loop cycle; ③ Perform a second cleaning of copper sulfide concentrate I to obtain copper sulfide concentrate II and cleaned tailings II. Cleaned tailings II are returned and combined with the copper sulfide rough concentrate to form a closed-loop cycle. ④ Copper sulfide concentrate II undergoes three cleaning processes to obtain copper sulfide concentrate III and cleaned tailings III. Cleaned tailings III are returned and combined with copper sulfide concentrate I to form a closed-loop cycle. ⑤ Copper sulfide concentrate III undergoes four cleaning processes to obtain copper sulfide concentrate IV and cleaned tailings IV. Cleaned tailings IV are returned and combined with copper sulfide concentrate II to form a closed-loop cycle. ⑥ Copper sulfide concentrate IV undergoes five cleaning processes to obtain copper sulfide concentrate V and cleaned tailings V. Copper sulfide concentrate V is the final copper sulfide concentrate. Cleaned tailings V are returned and combined with copper sulfide concentrate III to form a closed-loop cycle. ⑦ Copper sulfide roughing tailings undergo one scavenging process to obtain copper sulfide scavenging froth I and copper sulfide first-scavenging tailings I. Copper sulfide scavenging froth I is returned to the original ore slurry to form a closed-loop cycle. Copper sulfide first-scavenging tailings I is copper sulfide flotation tailings.

[0095] (3) Desliming and flotation: ① Add frother pine oil to the copper sulfide flotation tailings obtained in step (2) at a dosage of 10g / t, and carry out fine mud flotation to obtain copper-containing mud and deslimed slurry.

[0096] (4) Copper oxide flotation: ① Add tailings concentrate to the deslimed slurry obtained in step (3) to adjust the slurry concentration to 32%, then add sulfiding agent at a dosage of 1000 g / t, and add collector butyl xanthate and frother pine oil at dosages of 120 g / t and 20 g / t respectively. Stir for 5 min to carry out copper oxide roughing I, and obtain copper oxide roughing concentrate I and copper oxide roughing tailings I; ② Add sulfiding agent to copper oxide roughing tailings I at a dosage of 300 g / t, and add collector butyl xanthate and frother pine oil at dosages of 30 g / t and 30 g / t respectively. 0 g / t, 5 g / t, copper oxide scavenging II is carried out to obtain copper oxide scavenging concentrate II and copper oxide scavenging tailings II. Copper oxide scavenging concentrate II is combined with copper oxide roughing concentrate I; ③ Add sulfiding agent to copper oxide scavenging tailings II at a dosage of 300 g / t, add collector butyl xanthate and frother pine oil at dosages of 30 g / t and 5 g / t respectively, and carry out copper oxide scavenging I-II to obtain copper oxide scavenging concentrate I-II and copper oxide scavenging tailings I-II. Copper oxide scavenging concentrate I-II is combined with copper oxide roughing concentrate I; ④ Add a sulfiding agent (2000 g / t) to copper oxide scavenging tailings I-II, along with collector butyl xanthate and frother pine oil (30 g / t and 5 g / t respectively). Stir for 5 minutes and perform copper oxide roughing II to obtain copper oxide roughing concentrate II and copper oxide roughing tailings II. Then, add a sulfiding agent (300 g / t) to copper oxide roughing tailings II, along with collector butyl xanthate and frother pine oil (30 g / t and 5 g / t respectively). Perform copper oxide scavenging II-I to obtain copper oxide scavenging concentrate II. -I is combined with copper oxide scavenging tailings II-I, and copper oxide scavenging concentrate II-I is combined with copper oxide roughing concentrate II; ⑥ A sulfiding agent of 300 g / t is added to copper oxide scavenging tailings II-I, and collectors butyl xanthate and frother pine oil of 30 g / t and 5 g / t, respectively, to carry out copper oxide scavenging II-II, resulting in copper oxide scavenging concentrate II-II and copper oxide scavenging tailings II-II. The copper oxide scavenging concentrate II-II is combined with copper oxide roughing concentrate II, and copper oxide scavenging tailings II-II is the final tailings.

[0097] Comparative Example 2

[0098] In contrast, according to Figure 1The beneficiation process shown in the flowchart grinds the raw ore to a fineness of -0.074mm with a particle size content of 70%. In the comparative test, flotation desliming is performed before copper sulfide flotation. Other conditions are the same as in Example 2. For high oxidation rate copper ore with an oxidation rate of 75.84% and a copper grade of 2.14%, the test results of the two sets of conditions are shown in Table 2.

[0099] Table 2. Flotation test results of Example 2 and Comparative Example 2

[0100]

[0101] As shown in Table 2, there was no significant change in copper recovery rate and concentrate grade between Example 2 and Comparative Example 2. Acid leaching tests were conducted on the copper-bearing ore slime from Example 2 and Comparative Example 2, and the results are shown in Table 3.

[0102] Table 3. Results of acid leaching tests on copper-bearing ore slime in Example 2 and Comparative Example 2

[0103]

[0104] As shown in Table 3, the acid leaching rate of copper-bearing ore slime in the process provided by the present invention is 4.19 percentage points higher than that of the desliming flotation process before flotation, and the acid leaching rate is significantly improved.

[0105] Example 3

[0106] like Figure 1 As shown, this embodiment provides a flotation process for high-oxidation-rate copper ore, which is carried out according to the following steps:

[0107] (1) Grinding: The high oxidation rate copper ore is ground to a fineness of -0.074mm and a particle size content of 75%. Sulfidating agent is added during the grinding process at a dosage of 150g / t to obtain raw ore slurry with a slurry concentration of 38%.

[0108] (2) Copper sulfide flotation: ① Add butyl xanthate collector and rosin oil frother to the raw ore slurry at dosages of 80 g / t and 20 g / t, respectively, stir for 5 min, and perform a first roughing to obtain copper sulfide rough concentrate and copper sulfide rough tailings; ② Perform a first cleaning of the copper sulfide rough concentrate to obtain copper sulfide concentrate I and cleaned tailings I. Cleaned tailings I are returned and combined with the raw ore slurry to form a closed-loop cycle; ③ Perform a second cleaning of copper sulfide concentrate I to obtain copper sulfide concentrate II and cleaned tailings II. Cleaned tailings II are returned and combined with the copper sulfide rough concentrate to form a closed-loop cycle. ④ Copper sulfide concentrate II undergoes three cleaning processes to obtain copper sulfide concentrate III and cleaned tailings III. Cleaned tailings III are returned and combined with copper sulfide concentrate I to form a closed-loop cycle. ⑤ Copper sulfide concentrate III undergoes four cleaning processes to obtain copper sulfide concentrate IV and cleaned tailings IV. Cleaned tailings IV are returned and combined with copper sulfide concentrate II to form a closed-loop cycle. ⑥ Copper sulfide concentrate IV undergoes five cleaning processes to obtain copper sulfide concentrate V and cleaned tailings V. Copper sulfide concentrate V is the final copper sulfide concentrate. Cleaned tailings V are returned and combined with copper sulfide concentrate III to form a closed-loop cycle. ⑦ Copper sulfide roughing tailings undergo one scavenging process to obtain copper sulfide scavenging froth I and copper sulfide first-scavenging tailings I. Copper sulfide scavenging froth I is returned to the original ore slurry to form a closed-loop cycle. Copper sulfide first-scavenging tailings I is copper sulfide flotation tailings.

[0109] (3) Desliming and flotation: ① Add frother pine oil to the copper sulfide flotation tailings obtained in step (2) at a dosage of 10g / t, and carry out fine mud flotation to obtain copper-containing mud and deslimed slurry.

[0110] (4) Copper oxide flotation: ① Add tailings concentrate to the deslimed slurry obtained in step (3) to adjust the slurry concentration to 30%, then add sulfiding agent at a dosage of 2000 g / t, and add collector butyl xanthate and frother pine oil at dosages of 120 g / t and 20 g / t respectively. Stir for 5 min to carry out copper oxide roughing I, and obtain copper oxide roughing concentrate I and copper oxide roughing tailings I; ② Add sulfiding agent to copper oxide roughing tailings I at a dosage of 500 g / t, and add collector butyl xanthate and frother pine oil at dosages of 3 g / t and 3 g / t respectively. 0 g / t, 5 g / t, copper oxide scavenging II is carried out to obtain copper oxide scavenging concentrate II and copper oxide scavenging tailings II. Copper oxide scavenging concentrate II is combined with copper oxide roughing concentrate I; ③ Add sulfiding agent to copper oxide scavenging tailings II at a dosage of 500 g / t, add collector butyl xanthate and frother pine oil at dosages of 30 g / t and 5 g / t respectively, and carry out copper oxide scavenging I-II to obtain copper oxide scavenging concentrate I-II and copper oxide scavenging tailings I-II. Copper oxide scavenging concentrate I-II is combined with copper oxide roughing concentrate I; ④ Add a sulfiding agent (3000 g / t) to copper oxide scavenging tailings I-II, along with collector butyl xanthate (30 g / t) and frother pine oil (5 g / t), and stir for 5 minutes. Perform copper oxide roughing II to obtain copper oxide roughing concentrate II and copper oxide roughing tailings II. Then, add a sulfiding agent (500 g / t) to copper oxide roughing tailings II, along with collector butyl xanthate (30 g / t) and frother pine oil (5 g / t), and perform copper oxide scavenging II-I to obtain copper oxide scavenging concentrate II. -I is combined with copper oxide scavenging tailings II-I, and copper oxide scavenging concentrate II-I is combined with copper oxide roughing concentrate II; ⑥ Sulfidating agent is added to copper oxide scavenging tailings II-I at a dosage of 500g / t, collector butyl xanthate and frother pine oil are added at dosages of 30g / t and 5g / t respectively, and copper oxide scavenging II-II is carried out to obtain copper oxide scavenging concentrate II-II and copper oxide scavenging tailings II-II. Copper oxide scavenging concentrate II-II is combined with copper oxide roughing concentrate II, and copper oxide scavenging tailings II-II is the final tailings.

[0111] Comparative Example 3

[0112] In contrast, according to Figure 1 The beneficiation process shown in the flowchart grinds the raw ore to a fineness of -0.074mm with a particle size content of 75%. In Comparative Example 3, after copper sulfide flotation, production water is used to adjust the slurry concentration from 38% to 30%.

[0113] Comparative Example 4

[0114] Comparative Example 4 did not adjust the flotation concentration after copper sulfide flotation, and other conditions were the same as in Example 3. For high oxidation rate copper ore with an oxidation rate of 85.34% and a copper grade of 2.5%, the test results of the three sets of conditions are shown in Table 4.

[0115] Table 4. Flotation test results of Example 3 and Comparative Examples 3-4

[0116]

[0117] As shown in Table 4, the process flow provided by this invention achieves a copper recovery rate 1.67 percentage points higher than that using production water to adjust the slurry. Furthermore, the process flow provided by this invention results in a copper concentrate grade 1.78 percentage points higher and a copper recovery rate 3.61 percentage points higher than that of direct copper oxide flotation without slurry adjustment, demonstrating a significant improvement in copper recovery.

[0118] Example 4

[0119] like Figure 1 As shown, this embodiment provides a flotation process for high-oxidation-rate copper ore, which is carried out according to the following steps:

[0120] (1) Grinding: The high oxidation rate copper ore is ground to a fineness of -0.074mm and a particle size content of 72%. Sulfidating agent is added during the grinding process at a dosage of 150g / t to obtain raw ore slurry with a slurry concentration of 38%.

[0121] (2) Copper sulfide flotation: ① Add butyl xanthate collector and rosin oil frother to the raw ore slurry at dosages of 80 g / t and 20 g / t, respectively, stir for 5 min, and perform a first roughing to obtain copper sulfide rough concentrate and copper sulfide rough tailings; ② Perform a first cleaning of the copper sulfide rough concentrate to obtain copper sulfide concentrate I and cleaned tailings I. Cleaned tailings I are returned and combined with the raw ore slurry to form a closed-loop cycle; ③ Perform a second cleaning of copper sulfide concentrate I to obtain copper sulfide concentrate II and cleaned tailings II. Cleaned tailings II are returned and combined with the copper sulfide rough concentrate to form a closed-loop cycle. ④ Copper sulfide concentrate II undergoes three cleaning processes to obtain copper sulfide concentrate III and cleaned tailings III. Cleaned tailings III are returned and combined with copper sulfide concentrate I to form a closed-loop cycle. ⑤ Copper sulfide concentrate III undergoes four cleaning processes to obtain copper sulfide concentrate IV and cleaned tailings IV. Cleaned tailings IV are returned and combined with copper sulfide concentrate II to form a closed-loop cycle. ⑥ Copper sulfide concentrate IV undergoes five cleaning processes to obtain copper sulfide concentrate V and cleaned tailings V. Copper sulfide concentrate V is the final copper sulfide concentrate. Cleaned tailings V are returned and combined with copper sulfide concentrate III to form a closed-loop cycle. ⑦ Copper sulfide roughing tailings undergo one scavenging process to obtain copper sulfide scavenging froth I and copper sulfide first-scavenging tailings I. Copper sulfide scavenging froth I is returned to the original ore slurry to form a closed-loop cycle. Copper sulfide first-scavenging tailings I is copper sulfide flotation tailings.

[0122] (3) Desliming and flotation: ① Add frother pine oil to the copper sulfide flotation tailings obtained in step (2) at a dosage of 10g / t, and carry out fine mud flotation to obtain copper-containing mud and deslimed slurry.

[0123] (4) Copper oxide flotation: ① Add tailings concentrate to the deslimed slurry obtained in step (3) to adjust the slurry concentration to 30%, then add sulfiding agent at a dosage of 1500 g / t, and add collector butyl xanthate and frother pine oil at dosages of 120 g / t and 20 g / t respectively. Stir for 5 min to carry out copper oxide roughing I, and obtain copper oxide roughing concentrate I and copper oxide roughing tailings I; ② Add sulfiding agent to copper oxide roughing tailings I at a dosage of 400 g / t, and add collector butyl xanthate and frother pine oil at dosages of 3 g / t and 400 g / t respectively. 0 g / t, 5 g / t, copper oxide scavenging II is carried out to obtain copper oxide scavenging concentrate II and copper oxide scavenging tailings II. Copper oxide scavenging concentrate II is combined with copper oxide roughing concentrate I; ③ Add sulfiding agent to copper oxide scavenging tailings II at a dosage of 400 g / t, add collector butyl xanthate and frother pine oil at dosages of 30 g / t and 5 g / t respectively, and carry out copper oxide scavenging I-II to obtain copper oxide scavenging concentrate I-II and copper oxide scavenging tailings I-II. Copper oxide scavenging concentrate I-II is combined with copper oxide roughing concentrate I; ④ Add a sulfiding agent (2500 g / t) to copper oxide scavenging tailings I-II, along with collector butyl xanthate (30 g / t) and frother pine oil (5 g / t), and stir for 5 minutes. Perform copper oxide roughing II to obtain copper oxide roughing concentrate II and copper oxide roughing tailings II. Add a sulfiding agent (400 g / t) to copper oxide roughing tailings II, along with collector butyl xanthate (30 g / t) and frother pine oil (5 g / t), and perform copper oxide scavenging II-I to obtain copper oxide scavenging concentrate II. -I is combined with copper oxide scavenging tailings II-I, and copper oxide scavenging concentrate II-I is combined with copper oxide roughing concentrate II; ⑥ Sulfidating agent is added to copper oxide scavenging tailings II-I at a dosage of 400g / t, collector butyl xanthate and frother pine oil are added at dosages of 30g / t and 5g / t respectively, and copper oxide scavenging II-II is carried out to obtain copper oxide scavenging concentrate II-II and copper oxide scavenging tailings II-II. Copper oxide scavenging concentrate II-II is combined with copper oxide roughing concentrate II, and copper oxide scavenging tailings II-II is the final tailings.

[0124] Comparative Example 5

[0125] In contrast, according to Figure 2 The separation process shown in the flowchart is carried out in the following steps:

[0126] (1) Grinding: The high oxidation rate copper ore is ground to a fineness of -0.074 mm with a particle size content of 72%, to obtain raw ore slurry with a slurry concentration of 38%.

[0127] (2) Copper sulfide flotation: ① Add butyl xanthate collector and rosin oil frother to the raw ore slurry at dosages of 80 g / t and 20 g / t, respectively, stir for 5 min, and perform a first roughing to obtain copper sulfide rough concentrate and copper sulfide rough tailings; ② Perform a first cleaning of the copper sulfide rough concentrate to obtain copper sulfide concentrate I and cleaned tailings I. Cleaned tailings I are returned and combined with the raw ore slurry to form a closed-loop cycle; ③ Perform a second cleaning of copper sulfide concentrate I to obtain copper sulfide concentrate II and cleaned tailings II. Cleaned tailings II are returned and combined with the copper sulfide rough concentrate to form a closed-loop cycle. ④ Copper sulfide concentrate II undergoes three cleaning processes to obtain copper sulfide concentrate III and cleaned tailings III. Cleaned tailings III are returned and combined with copper sulfide concentrate I to form a closed-loop cycle. ⑤ Copper sulfide concentrate III undergoes four cleaning processes to obtain copper sulfide concentrate IV and cleaned tailings IV. Cleaned tailings IV are returned and combined with copper sulfide concentrate II to form a closed-loop cycle. ⑥ Copper sulfide concentrate IV undergoes five cleaning processes to obtain copper sulfide concentrate V and cleaned tailings V. Copper sulfide concentrate V is the final copper sulfide concentrate, and cleaned tailings V are returned and combined with copper sulfide concentrate III to form a closed-loop cycle. ⑦ Copper sulfide roughing tailings undergo one scavenging process to obtain copper sulfide scavenging froth I and copper sulfide first-scavenging tailings I. Copper sulfide scavenging froth I is returned to the original ore slurry to form a closed-loop cycle, and copper sulfide first-scavenging tailings I is copper sulfide flotation tailings.

[0128] (3) Copper oxide flotation: ① Add a sulfiding agent of 3000 g / t to the copper sulfide flotation tailings obtained in step (2), add butyl xanthate as collector and pine oil as frother as collector, and stir for 5 min to carry out copper oxide roughing I to obtain copper oxide rough concentrate I and copper oxide rough tailings I; ② Add a sulfiding agent of 500 g / t to the copper oxide rough tailings I, add butyl xanthate as collector and pine oil as frother as collector, and stir for 5 min to carry out copper oxide roughing I. Scavenging II yields copper oxide scavenged concentrate II and copper oxide scavenged tailings II. Copper oxide scavenged concentrate II is returned to copper oxide roughing I, forming a closed-loop cycle. ③ A sulfiding agent of 500 g / t is added to copper oxide scavenged tailings II, along with collector butyl xanthate and frother pine oil at dosages of 30 g / t and 5 g / t respectively. Copper oxide scavenging I-II is then carried out, yielding copper oxide scavenged concentrate I-II and copper oxide scavenged tailings I-II. Copper oxide scavenged concentrate I-II is returned to copper oxide scavenging II, forming a closed-loop cycle. ④ Add a sulfiding agent of 1500 g / t to copper oxide scavenging tailings I-II, along with collector butyl xanthate and frother pine oil, and perform copper oxide roughing II to obtain copper oxide roughing concentrate II and copper oxide roughing tailings II; ⑤ Add a sulfiding agent of 500 g / t to copper oxide roughing tailings II, along with collector butyl xanthate and frother pine oil, at amounts of 30 g / t and frother pine oil respectively, and perform copper oxide scavenging II-I to obtain copper oxide scavenging concentrate II-I and copper oxide scavenging tailings II-I. The copper oxide scavenging concentrate II-I is returned to the copper oxide roughing II, forming a closed-loop cycle; ⑥ A sulfiding agent of 500 g / t is added to the copper oxide scavenging tailings II-I, along with collector butyl xanthate and frother pine oil of 30 g / t and frother pine oil, respectively, to carry out copper oxide scavenging II-II, resulting in copper oxide scavenging concentrate II-II and copper oxide scavenging tailings II-II. The copper oxide scavenging concentrate II-II is returned to the copper oxide scavenging II-I, forming a closed-loop cycle, and the copper oxide scavenging tailings II-II are the final tailings.

[0129] For copper ore with a high oxidation rate of 80.18% and a copper grade of 2.35%, the test results are shown in Table 5.

[0130] Table 5. Flotation test results of Example 4 and Comparative Example 5

[0131]

[0132] As shown in Table 5, the process provided by this invention results in a 1.55 percentage point lower grade for copper sulfide concentrate and a 1.15 percentage point lower grade for copper oxide concentrate compared to conventional flotation processes. The overall recovery rate of copper sulfide and copper oxide is increased by 3.72 percentage points, and copper-bearing ore slime with a recovery rate of 8.70% is obtained. The grade of copper oxide tailings is reduced from 0.85% to 0.59%, the copper recovery rate is increased by 12.42%, and the amount of sulfiding agent used is reduced from 6500 g / t to 5750 g / t, a reduction of 11.54%.

[0133] Although the invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A flotation process for high-oxidation-rate copper ore, characterized in that, Includes the following steps: (1) Grinding: High oxidation rate copper ore is ground, and a sulfiding agent is added during the grinding process to obtain raw ore slurry; (2) Copper sulfide flotation: Collector and frother are added to the raw ore slurry for a first roughing process to obtain copper sulfide rough concentrate and copper sulfide roughing tailings. The obtained copper sulfide crude concentrate is subjected to N refining processes to obtain copper sulfide concentrate and refined tailings N. The refined tailings N are returned to the previous refining process. N is a positive integer greater than or equal to 3. The obtained copper sulfide roughing tailings are subjected to a first scavenging process to obtain copper sulfide scavenging foam I and copper sulfide flotation tailings. The obtained copper sulfide scavenging foam I is returned to the original ore slurry. (3) Desliming flotation: Add frother to the obtained copper sulfide flotation tailings and carry out fine mud flotation to obtain copper-bearing mud and deslimed slurry; (4) Copper oxide flotation: Tailings concentrate water is added to the obtained deslimed slurry for slurry conditioning; Sulfidating agent, collector and frother are added to the obtained slurry after conditioning for the first roughing process, and then sulfidating agent, collector and frother are added again for at least one scavenging process to obtain copper oxide concentrate I and copper oxide scavenging tailings I. A second roughing process is carried out by adding sulfidating agent, collector and frother to the obtained copper oxide scavenging tailings I, and then adding sulfidating agent, collector and frother for at least one scavenging process to obtain copper oxide concentrate II, final tailings and tailings concentrate water; In step (2), the flotation concentration is 38%-40%; The tailings concentrate obtained in step (4) is returned to the deslimed slurry to adjust the slurry concentration to 30-32%.

2. The flotation process for high-oxidation-rate copper ore according to claim 1, characterized in that, The vulcanizing agent mentioned in steps (1) and (4) is a mixture of sodium hydrosulfide and sodium sulfide in a mass ratio of 1:

1.

3. The flotation process for high-oxidation-rate copper ore according to claim 1, characterized in that, In steps (2) to (4), the collector is butyl xanthate and the foaming agent is pine oil.

4. The flotation process for high-oxidation-rate copper ore according to claim 1, characterized in that, In step (1), the content of the particle size with a grinding fineness of -0.074 mm is 70%-75%.

5. The flotation process for high-oxidation-rate copper ore according to claim 1, characterized in that, In step (1), the amount of vulcanizing agent used is 100-180g / t.

6. The flotation process for high-oxidation-rate copper ore according to claim 1, characterized in that, In step (2), the amount of collector is 80-120 g / t and the amount of foaming agent is 10-20 g / t.

7. The flotation process for high-oxidation-rate copper ore according to claim 1, characterized in that, In step (2), when the obtained copper sulfide crude concentrate is cleaned N times, when the first clean is completed, the obtained copper sulfide concentrate I enters the second clean, and the cleaned tailings I are returned to be combined with the original ore slurry; when the second clean is completed, the copper sulfide concentrate II enters the third clean, and the cleaned tailings II are returned to be combined with the copper sulfide crude concentrate.

8. The flotation process for high-oxidation-rate copper ore according to claim 1, characterized in that, In step (3), the amount of foaming agent used is 10-20g / t.

9. The flotation process for high-oxidation-rate copper ore according to claim 1, characterized in that, In step (4), during the first and second roughing processes, add the sulfiding agent, collector and foaming agent and stir for 5 to 10 minutes.

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