Dressing and smelting combined treatment process for high-oxidation-rate, high-cobalt and low-copper composite copper-cobalt ore

Abstract

A dressing and smelting combined treatment process for high-oxidation-rate high-cobalt low-copper composite copper-cobalt ore comprises the steps that the high-oxidation-rate high-cobalt low-copper composite copper-cobalt ore and high-copper low-cobalt copper-cobalt ore are subjected to ore blending, grinding and desulfurization, and copper sulfide concentrate and high-copper tailings are obtained; the high-copper tailings and cobalt concentrate are subjected to ore blending and leaching, and leaching liquid and leaching residues are obtained; washing liquid obtained through acid pickling of the leaching residues and / or the leaching liquid are / is extracted, and copper-rich liquid and cobalt-containing raffinate are obtained; the copper element is enriched in the copper-rich solution, and the cobalt element is enriched in the cobalt-containing raffinate. In the treatment process of the high-oxidation-rate, high-cobalt and low-copper composite copper-cobalt ore, by matching with other minerals and combining with optimized mineral separation and smelting processes, a good copper-cobalt recovery effect is achieved, particularly, the recovery rate of cobalt is remarkably increased, the production cost is reduced, and maximum utilization of resources is achieved.

Description

Technical Field

[0001] The present invention relates to a mineral resource processing technology, and specifically to a combined beneficiation and smelting treatment technology for high-cobalt and low-copper composite copper-cobalt ore. Background Art

[0002] High-oxidation-rate, high-cobalt and low-copper sulfur-oxygen composite copper-cobalt ore is a complex ore containing a relatively high cobalt content and a relatively low copper content, and accompanied by various elements such as sulfur and oxygen. The Democratic Republic of the Congo region is the world's largest enrichment area of sediment-hosted copper-cobalt deposits, located in the Central African copper-cobalt metallogenic belt. The Katanga Plateau where the SICOMINES copper-cobalt deposit is located is in the northeast of the Zaire Craton, the core of the African continent. The strata exposed in the mining area are mainly the Roan Group of the Neo-Proterozoic Katanga System. The strata are composed of dolomite, shale, claystone, sandstone, etc. The main mineralization types are oxidized ore, sulfide ore, and mixed ore. Most of the copper minerals are present in the ore in the form of free copper oxide and combined copper oxide, containing a small amount of primary copper sulfide and secondary copper sulfide. The cobalt minerals mainly exist in the form of cobalt oxide, with a small amount of cobalt silicate and cobalt sulfide. The ore has a high oxidation rate and serious slime. At present, this ore is mainly treated by different combined beneficiation and smelting processes according to the properties of the mined ore. However, the existing methods are only suitable for treating ores with a relatively low oxidation rate. For high-cobalt and low-copper sulfur-oxygen composite copper-cobalt ore with an oxidation rate greater than 80% and a cobalt oxide content greater than 95%, there is no efficient recovery method. If the existing technology is used to treat this type of high-oxidation-rate ore, there is often a low cobalt recovery rate, resulting in a large loss of valuable resources. Summary of the Invention

[0003] 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 combined beneficiation and smelting treatment technology for high-oxidation-rate, high-cobalt and low-copper composite copper-cobalt ore with a high cobalt recovery rate.

[0004] The technical solution adopted by the present invention to solve its technical problem is as follows: A combined beneficiation and smelting treatment technology for high-oxidation-rate, high-cobalt and low-copper composite copper-cobalt ore, which involves blending the high-oxidation-rate, high-cobalt and low-copper composite copper-cobalt ore with high-copper and low-cobalt copper-cobalt ore and grinding; adding reagents to the obtained pulp for desulfurization to obtain copper sulfide concentrate and high-copper tailings; the reagents include a collector and / or a frother;

[0005] The high-copper tailings are blended with cobalt concentrate to obtain a mixed ore; leaching is carried out to obtain a leaching solution and leaching residues; the washing solution obtained by pickling the leaching residues and / or the leaching solution are subjected to extraction to obtain a copper-rich solution and a cobalt-containing raffinate; copper elements are enriched in the copper-rich solution, and cobalt elements are enriched in the cobalt-containing raffinate;

[0006] The cobalt grade of the high oxidation rate, high cobalt and low copper composite copper-cobalt ore is 0.2 wt% to 1.0 wt%, the copper grade is 0.3 wt% to 1.8 wt%, and the oxidation rate is above 80%; among the cobalt-containing minerals of the high oxidation rate, high cobalt and low copper composite copper-cobalt ore, more than 95 wt% is cobalt oxide;

[0007] The copper grade of the high copper and low cobalt copper-cobalt ore is 3 wt% to 10 wt%, the cobalt grade is below 0.2 wt%, and the oxidation rate is above 80%;

[0008] The copper grade of the cobalt concentrate is 2 wt% to 7 wt%, and the cobalt grade is 0.18 wt% to 0.8 wt%;

[0009] The leaching agent used for leaching contains iron, sodium metabisulfite and sulfuric acid, and the pH value is 1 to 2.

[0010] Preferably, the cobalt grade of the high oxidation rate, high cobalt and low copper composite copper-cobalt ore is 0.4 wt% to 0.8 wt%, the copper grade is 0.6 wt% to 1.5 wt%, and the oxidation rate is above 85%; the gangue components include more than three of SiO2, CaO, MgO, K2O, and Al2O3.

[0011] Preferably, among the copper-containing minerals of the high oxidation rate, high cobalt and low copper composite copper-cobalt ore, more than 70 wt% is secondary copper sulfide and / or combined copper oxide.

[0012] Preferably, among the cobalt-containing minerals of the high oxidation rate, high cobalt and low copper composite copper-cobalt ore, more than 97 wt% is cobalt oxide.

[0013] Preferably, the copper grade of the high copper and low cobalt copper-cobalt ore is 5 wt% to 7 wt%, the cobalt grade is 0.06 wt% to 0.15 wt%, and the oxidation rate is above 85%.

[0014] Preferably, the high oxidation rate, high cobalt and low copper composite copper-cobalt ore is proportioned with the high copper and low cobalt copper-cobalt ore, and the weight ratio is 1:0.6 - 1.5.

[0015] Preferably, the grinding is: grinding to a fineness where the mineral particles of -0.074 mm account for 70 wt% to 85 wt%.

[0016] Preferably, the concentration of the pulp obtained by grinding is 25 wt% to 35 wt%.

[0017] Preferably, the dosage of the collector is 190 g / t pulp to 220 g / t pulp.

[0018] Preferably, the dosage of the frother is 45 g / t pulp to 55 g / t pulp.

[0019] Preferably, the collector includes butyl xanthate.

[0020] Preferably, the foaming agent includes pine oil.

[0021] Preferably, the copper grade of the cobalt concentrate is 3.2 wt% - 6.5 wt%, and the cobalt grade is 0.2 wt% - 0.7 wt%.

[0022] Preferably, the high - copper tailings are mixed with the cobalt concentrate, and the weight ratio is 70 - 75∶30 - 25.

[0023] Preferably, the cobalt concentrate consists of flotation cobalt concentrate and magnetic - separation cobalt concentrate in a weight ratio of 3 - 4∶1.

[0024] More preferably, the copper grade of the flotation cobalt concentrate is 4.0 wt% - 7.0 wt%, and the cobalt grade is 0.2 wt% - 0.6 wt%.

[0025] More preferably, the copper grade of the magnetic - separation cobalt concentrate is 1.5 wt% - 3.0 wt%, and the cobalt grade is 0.3 wt% - 0.8 wt%.

[0026] Preferably, the leaching includes first - stage leaching and second - stage enhanced leaching; after the first - stage leaching, separation is carried out to obtain the underflow pulp and the first - stage leaching solution; the underflow pulp is subjected to second - stage enhanced leaching, and separation is carried out to obtain the leaching residue and the second - stage leaching solution; the first - stage leaching solution and / or the second - stage leaching solution are used for subsequent extraction processes.

[0027] More preferably, the pH value during the first - stage leaching is 1.2 - 1.8, and the redox potential is 380 mV - 450 mV.

[0028] More preferably, the pH value during the second - stage enhanced leaching is 1.6 - 2.0, the redox potential is 300 mV - 350 mV, and the temperature is 50°C - 65°C.

[0029] More preferably, the liquid - to - solid ratio of the leaching system formed after adding the leaching agent in the first - stage leaching is 5 - 6∶1.

[0030] More preferably, the leaching time of the first - stage leaching is 5 h - 7 h.

[0031] More preferably, the liquid - to - solid ratio of the leaching system formed after adding the leaching agent in the second - stage enhanced leaching is 3 - 4∶i.

[0032] More preferably, the leaching time of the second - stage enhanced leaching is 5 h - 7 h.

[0033] Preferably, the leaching agent contains iron element with a concentration of 0.5 g / L - 2.5 g / L.

[0034] Preferably, the pH value of the washing solution used for pickling the leaching residue is 1.5 - 2.0.

[0035] Preferably, the extractant for extraction is Lix984N.

[0036] The present invention has the following beneficial effects: In the process of treating high-oxidation-rate, high-cobalt and low-copper composite copper-cobalt ore, by cooperating with other minerals and combining with optimized ore dressing processes, good copper and cobalt recovery effects are achieved. In particular, the recovery rate of cobalt is significantly improved, the production cost is reduced, and the maximum utilization of resources is realized.

[0037] In addition to the purposes, features and advantages described above, the present invention has other purposes, features and advantages. Hereinafter, the present invention will be described in further detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0039] Figure 1 is the process flow diagram of the combined beneficiation and smelting treatment process of high-oxidation-rate, high-cobalt and low-copper composite copper-cobalt ore in Embodiment 1 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] 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.

[0041] 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 recorded; and any lower limit can be combined with other lower limits to form a range not explicitly recorded. Similarly, any upper limit can be combined with any other upper limit to form a range not explicitly recorded. In addition, although not explicitly recorded, each point or single value between the range endpoints is included in this range. Thus, each point or single value can be used as its own lower limit or upper limit and combined with any other point or single value or combined with other lower limits or upper limits to form a range not explicitly recorded.

[0042] In the description herein, it should be noted that unless otherwise specified, "above" and "below" include this number, the meaning of "multiple" in "one or more" is two or more, and the meaning of "multiple" in "one or more" is two or more.

[0043] An embodiment of the present invention provides a combined beneficiation and smelting treatment process for a high-oxidation-rate, high-cobalt, low-copper composite copper-cobalt ore. The high-oxidation-rate, high-cobalt, low-copper composite copper-cobalt ore is proportioned with a copper-cobalt ore with high copper and low cobalt, and then ground; the obtained pulp is added with a reagent for desulfurization to obtain copper sulfide concentrate and high-copper tailings; the reagent includes a collector and / or a foaming agent.

[0044] The high-copper tailings are proportioned with cobalt concentrate to obtain a mixed ore; the mixed ore is leached to obtain a leachate and leaching residues; the washing liquid obtained by pickling the leaching residues and / or the leachate is subjected to extraction to obtain a copper-rich liquid and a cobalt-containing raffinate; copper elements are enriched in the copper-rich liquid, and cobalt elements are enriched in the cobalt-containing raffinate.

[0045] The cobalt grade of the high-oxidation-rate, high-cobalt, low-copper composite copper-cobalt ore is 0.2 wt% to 1.0 wt%, the copper grade is 0.3 wt% to 1.8 wt%, and the oxidation rate is above 80%; among the cobalt-containing minerals in the high-oxidation-rate, high-cobalt, low-copper composite copper-cobalt ore, more than 95 wt% is cobalt oxide.

[0046] The copper grade of the copper-cobalt ore with high copper and low cobalt is 3 wt% to 10 wt%, the cobalt grade is below 0.2 wt%, and the oxidation rate is above 80%.

[0047] The copper grade of the cobalt concentrate is 2 wt% to 7 wt%, and the cobalt grade is 0.18 wt% to 0.8 wt%.

[0048] The leaching agent used for leaching contains iron, sodium metabisulfite and sulfuric acid, and the pH value is 1 to 2.

[0049] For the high-oxidation-rate, high-cobalt, low-copper composite copper-cobalt ore, the conventional desulfurization process will be difficult to directly leach secondary copper sulfide to obtain copper sulfide concentrate. In the present invention, by combining the high-oxidation-rate, high-cobalt, low-copper composite copper-cobalt ore with a copper-cobalt ore with high copper and low cobalt, the conventional desulfurization process can be used to treat the high-oxidation-rate, high-cobalt, low-copper composite copper-cobalt ore.

[0050] The combined beneficiation and smelting treatment process for the high-oxidation-rate, high-cobalt, low-copper composite copper-cobalt ore provided by the embodiment of the present invention has the following advantages: In the process of treating the high-oxidation-rate, high-cobalt, low-copper composite copper-cobalt ore, by combining with other minerals and optimizing the beneficiation process, good copper and cobalt recovery effects are achieved, especially the recovery rate of cobalt is significantly improved, the production cost is reduced, and the maximum utilization of resources is realized.

[0051] In the embodiment of the present invention, the cobalt grade of the high-oxidation-rate, high-cobalt, low-copper composite copper-cobalt ore is 0.4 wt% to 0.8 wt%, the copper grade is 0.6 wt% to 1.5 wt%, and the oxidation rate is above 85%; the gangue components include more than three of SiO2, CaO, MgO, K2O, and Al2O3.

[0052] In an embodiment of the present invention, among the copper-containing minerals of the high-oxidation-rate, high-cobalt, and low-copper composite copper-cobalt ore, more than 70 wt% is secondary copper sulfide and / or combined copper oxide. Secondary copper sulfide and combined copper oxide are relatively difficult to leach.

[0053] In some embodiments of the present invention, among the cobalt-containing minerals of the high-oxidation-rate, high-cobalt, and low-copper composite copper-cobalt ore, more than 97 wt% is cobalt oxide.

[0054] In an embodiment of the present invention, the copper-cobalt ore with high copper and low cobalt has a copper grade of 5 wt% to 7 wt%, a cobalt grade of 0.06 wt% to 0.15 wt%, and an oxidation rate of more than 85%.

[0055] In an embodiment of the present invention, the high-oxidation-rate, high-cobalt, and low-copper composite copper-cobalt ore is proportioned with the high-copper and low-cobalt copper-cobalt ore, and the weight ratio is 1:0.6 - 1.5.

[0056] In an embodiment of the present invention, the grinding is as follows: the mineral particles with a fineness of -0.074 mm account for 70 wt% to 85 wt%. This fineness helps to dissociate the copper-cobalt minerals and facilitates subsequent leaching treatment.

[0057] In an embodiment of the present invention, the concentration of the ground pulp is 25 wt% to 35 wt%.

[0058] In an embodiment of the present invention, the dosage of the collector is 190 g / t of pulp to 220 g / t of pulp.

[0059] In an embodiment of the present invention, the dosage of the frother is 45 g / t of pulp to 55 g / t of pulp.

[0060] In an embodiment of the present invention, the collector includes butyl xanthate.

[0061] In an embodiment of the present invention, the frother includes pine oil.

[0062] In an embodiment of the present invention, the copper grade of the cobalt concentrate is 3.2 wt% to 6.5 wt%, and the cobalt grade is 0.2 wt% to 0.7 wt%.

[0063] In an embodiment of the present invention, the high-copper tailings are proportioned with the cobalt concentrate, and the weight ratio is 70 - 75:30 - 25.

[0064] In an embodiment of the present invention, the cobalt concentrate is composed of flotation cobalt concentrate and magnetic separation cobalt concentrate in a weight ratio of 3 - 4:1.

[0065] In some embodiments of the present invention, the copper grade of the flotation cobalt concentrate is 4.0 wt% to 7.0 wt%, and the cobalt grade is 0.2 wt% to 0.6 wt%.

[0066] In some embodiments of the present invention, the copper grade of the magnetic separation cobalt concentrate is 1.5 wt% - 3.0 wt%, and the cobalt grade is 0.3 wt% - 0.8 wt%.

[0067] In the embodiments of the present invention, the leaching includes first-stage leaching and second-stage enhanced leaching; after the first-stage leaching, separation is carried out to obtain the underflow pulp and the first-stage leaching solution; the underflow pulp is subjected to second-stage enhanced leaching, and separation is carried out to obtain the leaching residue and the second-stage leaching solution; the first-stage leaching solution and / or the second-stage leaching solution are used for subsequent extraction processes. The added cobalt concentrate can reduce the solution oxidation-reduction potential during leaching, which is beneficial to the co-leaching of cobalt minerals. The first-stage leaching mainly treats the easily leachable copper-cobalt minerals, and the second-stage enhanced leaching process is used to specifically treat the difficult-to-leach copper-cobalt minerals.

[0068] Under the conditions of ordinary leaching process, the copper recovery rate of the high-oxidation-rate, high-cobalt and low-copper composite copper-cobalt ore is 85 - 87%, and the cobalt recovery rate is 5 - 6%; under the process conditions adopted in the present invention, the final comprehensive copper recovery rate is 91 - 93%, the comprehensive cobalt recovery rate is 75 - 78%, the copper recovery rate can be increased by 6%, and the cobalt recovery rate can be increased by 70%.

[0069] In some embodiments of the present invention, the pH value during the first-stage leaching is 1.2 - 1.8, and the oxidation-reduction potential is 380 mV - 450 mV.

[0070] In some embodiments of the present invention, the pH value during the second-stage enhanced leaching is 1.6 - 2.0, the oxidation-reduction potential is 300 mV - 350 mV, and the temperature is 50°C - 65°C. Under the comprehensive leaching conditions such as temperature increase, reduction environment, and pH value in the second-stage enhanced leaching process, the leaching rates of copper and cobalt can be significantly increased. The reaction temperature, oxidation-reduction potential, and pH value can improve the utilization efficiency of the reducing agent. The temperature increase also accelerates the decomposition of sodium metabisulfite, releasing more SO2, which can further reduce the solution oxidation-reduction potential and create better reduction conditions for the leaching of cobalt.

[0071] In some embodiments of the present invention, steam is introduced for heating during the second-stage enhanced leaching.

[0072] In some embodiments of the present invention, the liquid-solid ratio of the leaching system formed after adding the leaching agent in the first-stage leaching is 5 - 6:1.

[0073] In some embodiments of the present invention, the leaching time of the first-stage leaching is 5 h - 7 h.

[0074] In some embodiments of the present invention, the liquid-solid ratio of the leaching system formed after adding the leaching agent in the second-stage enhanced leaching is 3 - 4:1.

[0075] In some embodiments of the present invention, the leaching time of the second-stage enhanced leaching is 5 h - 7 h.

[0076] In an embodiment of the present invention, the leaching agent contains iron element with a concentration of 0.5 g / L to 2.5 g / L.

[0077] In some embodiments of the present invention, the leaching agent is prepared from raw materials including sodium metabisulfite solution, concentrated sulfuric acid, and raffinate from a copper-cobalt hydrometallurgical process; wherein the iron element content in the raffinate from the copper-cobalt hydrometallurgical process is 1.0 g / L to 2.0 g / L.

[0078] In an embodiment of the present invention, the pH value of the washing solution used for pickling the leaching residue is 1.5 to 2.0.

[0079] In some embodiments of the present invention, countercurrent washing is adopted for pickling the leaching residue.

[0080] The obtained copper sulfide concentrate can be used for producing cathode copper through an oxygen-enriched roasting - acid leaching - electrowinning process.

[0081] The obtained copper-rich solution can be used for producing cathode copper through an electrowinning process.

[0082] After removing iron and manganese from the cobalt-containing raffinate, crude cobalt hydroxide can be produced through conventional cobalt precipitation.

[0083] In an embodiment of the present invention, the extractant for extraction is Lix984N. Lix984N is a commonly used copper extractant and can be directly purchased for use.

[0084] Example

[0085] 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 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 directly used without further treatment. Unless otherwise stated, the instruments used in the examples can be obtained through conventional commercial channels.

[0086] Example 1

[0087] As Figure 1As shown in the figure, the copper grade of the high oxidation rate, high cobalt, low copper sulfur-oxygen composite copper-cobalt ore involved in this embodiment is 0.88%, the cobalt grade is 0.65%, the oxidation rate is 83.39%, and the gangue components include SiO2, CaO, MgO, K2O, and Al2O3. Among the copper-containing minerals, 56 wt% is secondary copper sulfide, 26 wt% is combined copper oxide, 13 wt% is copper sulfate, and the rest is free copper oxide. Among the cobalt-containing minerals, more than 97.8 wt% is cobalt oxide, followed by cobalt sulfide and cobalt sulfate.

[0088] The combined beneficiation and smelting treatment process for the high oxidation rate, high cobalt, low copper sulfur-oxygen composite copper-cobalt ore in this embodiment has the following specific process flow:

[0089] (1) The high oxidation rate, high cobalt, low copper composite copper-cobalt ore is mixed with a copper-cobalt ore with high copper and low cobalt, and they are crushed and ground together. The obtained pulp is added with reagents for desulfurization to obtain copper sulfide concentrate and high-copper tailings.

[0090] (2) The high-copper tailings are mixed with cobalt concentrate for leaching, and the leaching includes first-stage leaching and second-stage enhanced leaching. After the first-stage leaching of the mixed ore, thickening separation is carried out to obtain underflow pulp and first-stage leaching solution. The underflow pulp is subjected to second-stage enhanced leaching, and the leaching residue and second-stage leaching solution are separated. The leaching residue is washed through 5-stage countercurrent washing to obtain washing solution. The first-stage leaching solution, second-stage leaching solution, and washing solution are subjected to extraction to obtain copper-rich solution and cobalt-containing raffinate.

[0091] The copper sulfide concentrate is subjected to oxygen-enriched roasting, acid leaching-direct electrowinning to produce cathode copper; the copper-rich solution enters the electrowinning process to produce cathode copper, and the cobalt-containing raffinate enters the iron removal and cobalt precipitation process to produce crude cobalt hydroxide.

[0092] Among them, the copper-cobalt ore with high copper and low cobalt mixed with the high oxidation rate, high cobalt, low copper composite copper-cobalt ore has a copper oxidation rate of 88.1%, a cobalt oxidation rate of 100%, a copper grade of 5.81%, and a cobalt grade of 0.122%. The mixing ratio is the mass ratio of the high oxidation rate, high cobalt, low copper composite copper-cobalt ore to the copper-cobalt ore with high copper and low cobalt of 1:1. After ore mixing, grinding is carried out until the particles with a fineness of -0.074 mm account for 80 wt%, and the mass percentage concentration of the pulp is 32 wt%.

[0093] The desulfurization process consumes 202 g / t of pulp of butyl xanthate (collector) and 48 g / t of pulp of pine oil (foaming agent).

[0094] The cobalt concentrate consists of flotation cobalt concentrate and magnetic separation cobalt concentrate; the ratio of flotation cobalt concentrate, magnetic separation cobalt concentrate to high-copper tailings is 30:8:100. The flotation cobalt concentrate contains 5.53% copper and 0.38% cobalt; the magnetic separation cobalt concentrate contains 2.11% copper and 0.54% cobalt.

[0095] The pH value of the first-stage leaching is 1.5, the oxidation-reduction potential is 385 - 395 mV, the liquid-solid ratio is 5 - 6:1, and the leaching time is 5 h - 7 h; for the second-stage enhanced leaching, the pH value is 1.7 - 1.8, steam is introduced to raise the temperature, the leaching temperature is 55 - 60 °C, the liquid-solid ratio is controlled at 3 - 4:1, the oxidation-reduction potential is 310 - 330 mV, and the leaching time is 5 h - 7 h. The leaching agent used in the first-stage leaching and the second-stage enhanced leaching contains iron, sodium metabisulfite and sulfuric acid, with iron content of 1.0 - 2.0 g / L.

[0096] The extractant used for extraction is Lix984N.

[0097] The pH value during the washing process is controlled within the range of 1.6 - 1.8.

[0098] The ore dressing process indexes of this embodiment are as follows:

[0099] Product Name Yield / % Cu Grade / % Co Grade / % Cu Recovery Rate / % Co Recovery Rate / % Copper Sulfide Concentrate 0.67 65.79 0.14 11.76 0.28 High-Copper Tailings 99.33 3.33 0.41 88.24 99.72

[0100] In Example 1, the original ore has a copper grade of 0.88%, a cobalt grade of 0.65%, an oxidation rate of 83.39%, and a yield of 0.67% can be obtained. The copper grade of the copper sulfide concentrate is 65.79%, the cobalt grade is 0.14%, the copper recovery rate is 11.76%, and the cobalt recovery rate is 0.28%; the yield of the high-copper tailings is 99.33%, the copper grade is 3.33%, the cobalt grade is 0.439%, the copper recovery rate is 88.24%, and the cobalt recovery rate is 99.72%.

[0101] The obtained high-copper tailings are subjected to ore blending and leaching, and the copper leaching rate is 91.45% and the cobalt leaching rate is 76.03%; the obtained copper sulfide concentrate is subjected to a conventional smelting pretreatment process (the copper sulfide concentrate is roasted in a fluidized bed roaster at a temperature of 600 - 800 °C) to obtain copper sulfide concentrate calcine, and then subjected to a conventional leaching process (using sulfuric acid as the leaching agent, stirring leaching at room temperature, acid concentration of 20 - 100 g / L, leaching time of 3 - 6 hours, liquid-solid ratio [leaching solution / calcine] = 14 - 16:1), and the copper leaching rate is 98.05% and the cobalt leaching rate is 82.40%.

[0102] The total copper recovery rate of this ore dressing and metallurgy combined process is 92.23%, and the total cobalt recovery rate is 76.04%.

[0103] If all the minerals incorporated are processed according to the conventional beneficiation and metallurgy grinding and leaching process flow (the pulp is crushed and ground by a ball mill until the mineral particles with a fineness of -0.074 mm account for 70 wt% - 85 wt%, and the concentration of the ground pulp is 25 wt% - 35 wt%; sulfuric acid is used as the leaching agent for the obtained pulp, stirred and leached at room temperature, the leaching pH value is 1.2 - 1.8, the leaching time is 3 - 6 hours, and the pulp concentration is 5% - 15%), the total copper recovery rate is 87.77%, and the total cobalt recovery rate is 54.85%. This example can increase the comprehensive copper recovery rate by 4.46% and the cobalt recovery rate by 21.19% compared with the conventional treatment process, especially showing a very significant improvement in the cobalt recovery rate.

[0104] Example 2

[0105] The copper grade of the high-oxidation-rate, high-cobalt, low-copper sulfur-oxygen composite copper-cobalt ore involved in this example is 0.56%, the cobalt grade is 0.576%, the oxidation rate is 85.57%, and the gangue components include SiO2, CaO, MgO, K2O, and Al2O3; among the copper-containing minerals, more than 75 wt% are secondary copper sulfide and / or combined copper oxide, and among the cobalt-containing minerals, more than 97.1 wt% are cobalt oxide.

[0106] The beneficiation and metallurgy combined treatment process for the high-oxidation-rate, high-cobalt, low-copper sulfur-oxygen composite copper-cobalt ore in this example is as follows:

[0107] (1) The high-oxidation-rate, high-cobalt, low-copper composite copper-cobalt ore is incorporated with a copper-cobalt ore with high copper and low cobalt, and they are crushed and ground together. The obtained pulp is added with reagents for desulfurization to obtain copper sulfide concentrate and high-copper tailings;

[0108] (2) The high-copper tailings are incorporated with cobalt concentrate for leaching. The leaching includes first-stage leaching and second-stage intensified leaching; after the mixed ore is leached in the first stage and thickened and separated, the underflow pulp and the first-stage leaching solution are obtained; the underflow pulp is subjected to second-stage intensified leaching, and the leaching residue and the second-stage leaching solution are separated; the leaching residue is washed by 5-stage countercurrent washing to obtain the washing solution; the first-stage leaching solution, the second-stage leaching solution, and the washing solution are subjected to extraction to obtain copper-rich solution and cobalt-containing raffinate;

[0109] The copper sulfide concentrate is subjected to oxygen-enriched roasting, acid leaching - direct electrowinning to produce cathode copper; the copper-rich solution enters the electrowinning process to produce cathode copper, and the cobalt-containing raffinate enters the iron removal and cobalt precipitation process to produce crude cobalt hydroxide.

[0110] Among them, the copper-cobalt ore with high copper and low cobalt incorporated with the high-oxidation-rate, high-cobalt, low-copper composite copper-cobalt ore has a copper oxidation rate of 86.82%, a cobalt oxidation rate of 98.52%, a copper grade of 6.18%, and a cobalt grade of 0.075%. The mixing ratio is the mass ratio of the high-oxidation-rate, high-cobalt, low-copper composite copper-cobalt ore to the copper-cobalt ore with high copper and low cobalt of 3:2. After mixing and grinding, the particles with a fineness of -0.074 mm account for 82 wt%, and the mass percentage concentration of the pulp is 31 wt%.

[0111] In the desulfurization process, 214 g / t of pulp of butyl xanthate (collector) and 49 g / t of pulp of pine oil (foaming agent) are consumed.

[0112] The cobalt concentrate consists of flotation cobalt concentrate and magnetic separation cobalt concentrate; the ratio of flotation cobalt concentrate, magnetic separation cobalt concentrate and high-copper tailings is 33:9:100. The flotation cobalt concentrate contains 4.31% copper and 0.41% cobalt; the magnetic separation cobalt concentrate contains 2.51% copper and 0.49% cobalt.

[0113] For the first-stage leaching, the pH value is 1.6, the oxidation-reduction potential is 380 - 390 mV, the liquid-solid ratio is 5 - 6:1, and the leaching time is 5 h - 7 h; for the second-stage intensified leaching, the pH value is 1.8 - 1.9, steam is introduced to raise the temperature, the leaching temperature is 55 - 60 °C, the liquid-solid ratio is controlled at 3 - 4:1, the oxidation-reduction potential is 300 - 320 mV, and the leaching time is 5 h - 7 h. The leaching agents used in the first-stage leaching and the second-stage intensified leaching contain iron, sodium metabisulfite and sulfuric acid, and the iron content is 1.0 - 2.0 g / L.

[0114] The extractant used in extraction is Lix984N.

[0115] The pH value during the washing process is controlled within the range of 1.7 - 1.9.

[0116] The ore dressing process indexes of this embodiment are as follows:

[0117] Product Name Yield / % Cu Grade / % Co Grade / % Cu Recovery Rate / % Co Recovery Rate / % Copper Sulfide Concentrate 0.52 64.02 0.17 10.61 0.23 High-Copper Tailings 99.48 2.82 0.392 89.39 99.77

[0118] In Example 2, the original ore has a copper grade of 0.56%, a cobalt grade of 0.576%, an oxidation rate of 85.57%, and a sulfide copper concentrate with a yield of .52%, a copper grade of 64.02%, a cobalt grade of 0.17%, a copper recovery rate of 10.61%, and a cobalt recovery rate of 0.23% can be obtained; the yield of high-copper tailings is 99.48%, the copper grade is 2.82%, the cobalt grade is 0.392%, the copper recovery rate is 89.39%, and the cobalt recovery rate is 99.77%.

[0119] The obtained high-copper tailings are subjected to ore blending and leaching, and the copper leaching rate is 91.70% and the cobalt leaching rate is 77.55%; the obtained sulfide copper concentrate is subjected to a conventional smelting process to obtain sulfide copper concentrate calcine, which is treated by a conventional leaching process, and the copper leaching rate is 98.12% and the cobalt leaching rate is 87.03%.

[0120] The total copper recovery rate of this combined ore dressing and metallurgy process is 91.73%, and the total cobalt recovery rate is 77.60%.

[0121] If all the minerals incorporated are processed according to the conventional beneficiation and smelting grinding and leaching process flow, the total copper recovery rate is 87.82%, and the total cobalt recovery rate is 50.36%. In this embodiment, compared with the conventional treatment process, the comprehensive copper recovery rate can be increased by 3.91%, and the cobalt recovery rate can be increased by 27.24%. Especially, there is a very significant improvement in the cobalt recovery rate.

[0122] Example 3

[0123] The copper grade of the high-oxidation-rate, high-cobalt and low-copper sulfide-oxide composite copper-cobalt ore involved in this embodiment is 0.45%, the cobalt grade is 0.795%, the oxidation rate is 87.63%, and the gangue components include SiO2, CaO, MgO, K2O, and Al2O3. Among the copper-containing minerals, more than 78 wt% are secondary copper sulfide and / or combined copper oxide. Among the cobalt-containing minerals, more than 98.3 wt% are cobalt oxide.

[0124] The beneficiation and smelting combined treatment process for the high-oxidation-rate, high-cobalt and low-copper sulfide-oxide composite copper-cobalt ore in this embodiment has the following specific process flow:

[0125] (1) Incorporate the high-oxidation-rate, high-cobalt and low-copper composite copper-cobalt ore with the high-copper and low-cobalt copper-cobalt ore, crush and grind them together, add reagents to the obtained pulp for desulfurization to obtain copper sulfide concentrate and high-copper tailings;

[0126] (2) Incorporate the high-copper tailings with cobalt concentrate for leaching. The leaching includes first-stage leaching and second-stage intensified leaching; after the first-stage leaching of the mixed ore, it is thickened and separated to obtain underflow pulp and first-stage leaching solution; the underflow pulp is subjected to second-stage intensified leaching, and the leaching residue and second-stage leaching solution are separated; the leaching residue is washed by 5-stage countercurrent washing to obtain washing solution; the first-stage leaching solution, second-stage leaching solution and washing solution are subjected to extraction to obtain copper-rich solution and cobalt-containing raffinate;

[0127] The copper sulfide concentrate is roasted with oxygen enrichment, acid leached and directly electrowon to produce cathode copper; the copper-rich solution enters the electrowinning process to produce cathode copper, and the cobalt-containing raffinate enters the iron removal and cobalt precipitation process to produce crude cobalt hydroxide.

[0128] Among them, the high-copper and low-cobalt copper-cobalt ore incorporated with the high-oxidation-rate, high-cobalt and low-copper composite copper-cobalt ore has a copper oxidation rate of 82.52%, a cobalt oxidation rate of 99.3%, a copper grade of 8.14%, and a cobalt grade of 0.058%. The incorporation ratio is the mass ratio of the high-oxidation-rate, high-cobalt and low-copper composite copper-cobalt ore to the high-copper and low-cobalt copper-cobalt ore of 3:2. After ore blending, the grinding fineness is such that the particles with a size of -0.074 mm account for 82 wt%, and the mass percentage concentration of the pulp is 31 wt%.

[0129] The desulfurization process consumes 197 g / t of pulp of butyl xanthate (collector) and 43 g / t of pulp of pine oil (foaming agent).

[0130] The cobalt concentrate consists of flotation cobalt concentrate and magnetic separation cobalt concentrate; the ratio of flotation cobalt concentrate, magnetic separation cobalt concentrate and high-copper tailings is 27:8:100. The flotation cobalt concentrate contains 3.56% copper and 0.32% cobalt; the magnetic separation cobalt concentrate contains 2.33% copper and 0.44% cobalt.

[0131] The pH value of the first-stage leaching is 1.4, the redox potential is 385 - 395 mV, the liquid-solid ratio is 5 - 6:1, and the leaching time is 5 h - 7 h; the pH value of the second-stage enhanced leaching is 1.6 - 1.7, steam is introduced to raise the temperature, the leaching temperature is 58 - 63 °C, the liquid-solid ratio is controlled at 3 - 4:1, the redox potential is 305 - 325 mV, and the leaching time is 5 h - 7 h. The leaching agent used in the first-stage leaching and the second-stage enhanced leaching contains iron, sodium metabisulfite and sulfuric acid, and the iron content is 1.0 - 2.0 g / L.

[0132] The extractant used for extraction is Lix984N.

[0133] The pH value during the washing process is controlled within the range of 1.8 - 2.0.

[0134] The ore dressing process indexes of this embodiment are as follows:

[0135] Product Name Yield / % Cu Grade / % Co Grade / % Cu Recovery Rate / % Co Recovery Rate / % Copper Sulfide Concentrate 0.76 66.39 0.28 14.57 0.46 High-Copper Tailings 99.24 2.98 0.462 85.43 99.54

[0136] In Example 3, the copper grade of the raw ore is 0.45%, the cobalt grade is 0.795%, the oxidation rate is 87.63%, and a copper sulfide concentrate with a yield of 0.76%, a copper grade of 66.39%, a cobalt grade of 0.28%, a copper recovery rate of 14.57%, and a cobalt recovery rate of 0.46% can be obtained; the yield of high-copper tailings is 99.24%, the copper grade is 2.98%, the cobalt grade is 0.462%, the copper recovery rate is 85.43%, and the cobalt recovery rate is 99.54%.

[0137] The obtained high-copper tailings are subjected to ore blending and leaching, and the copper leaching rate is 92.30% and the cobalt leaching rate is 77.17%; the obtained copper sulfide concentrate is processed through a conventional smelting process to obtain copper sulfide concentrate calcine, and after being treated through a conventional leaching process, the copper leaching rate is 98.31% and the cobalt leaching rate is 90.26%.

[0138] The total copper recovery rate of this combined ore dressing and metallurgy process is 92.34%, and the total cobalt recovery rate is 77.27%.

[0139] If all the minerals incorporated are processed according to the conventional ore dressing, grinding and leaching process flow, the total copper recovery rate is 87.65% and the total cobalt recovery rate is 48.53%. This embodiment can increase the comprehensive copper recovery rate by 4.70% and the cobalt recovery rate by 28.73% compared with the conventional treatment process, especially showing a very significant improvement in the cobalt recovery rate.

[0140] Comparative Example 1

[0141] The high-oxidation-rate, high-cobalt, low-copper sulfur-oxygen composite copper-cobalt ore used in Comparative Example 1 is from the same batch as that in Example 1 and has a similar composition. However, due to different specific samples being taken, there are slight differences in the ore data. The copper grade is 0.88%, the cobalt grade is 0.69%, and the oxidation rate is 84.4%. In this comparative example, a conventional treatment process is used for the high-oxidation-rate, high-cobalt, low-copper sulfur-oxygen composite copper-cobalt ore. The specific steps are as follows:

[0142] The above-mentioned high-oxidation-rate, high-cobalt, low-copper sulfur-oxygen composite copper-cobalt ore is treated using a conventional grinding-sulfuric acid leaching-extraction-electrowinning process. The specific process is as follows:

[0143] The high-oxidation-rate, high-cobalt, low-copper sulfur-oxygen composite copper-cobalt ore is crushed and ground and then enters the leaching process. The leaching process includes normal-temperature sulfuric acid leaching, thickening separation, and pressure filtration washing. The leaching solution and washing solution enter the extraction-electrowinning process to produce cathode copper, and the cobalt-containing raffinate enters the iron removal and cobalt precipitation process to produce crude cobalt hydroxide.

[0144] Among them, after the high-oxidation-rate, high-cobalt, low-copper sulfur-oxygen composite copper-cobalt ore is crushed and ground, the particles with a fineness of -0.074 mm account for 80 wt%, and the mass percentage concentration of the pulp is 30%.

[0145] The pH value of the leaching agent is 1.5, the oxidation-reduction potential is 385 - 395 mV, the liquid-solid ratio is controlled at 5 - 6:1, and the leaching time is 5 h - 7 h.

[0146] The beneficiation process indexes of this comparative example are as follows:

[0147] Product Name Yield / % Cu Grade / % Co Grade / % Cu Recovery Rate / % Co Recovery Rate / % Oxide Ore 100 0.88 0.69 100 100

[0148] In Comparative Example 1, the original ore has a copper grade of 0.88%, a cobalt grade of 0.69%, and an oxidation rate of 84.4%. After crushing and grinding, an oxidized ore with a yield of 100%, a copper grade of 0.88%, a cobalt grade of 0.69%, a copper recovery rate of 100%, and a cobalt recovery rate of 100% can be obtained. After smelting treatment, the copper leaching rate of the oxidized ore is 86.30% and the cobalt leaching rate is 5.5%.

[0149] The total copper recovery rate of this process is 86.30%, and the total cobalt recovery rate is 5.5%. The cobalt recovery rate is very low.

[0150] Comparative Example 2

[0151] The high-oxidation-rate, high-cobalt, low-copper sulfur-oxygen composite copper-cobalt ore used in Comparative Example 2 is from the same batch as that in Example 1 and has a similar composition. However, due to different specific samples being taken, there are slight differences in the ore data. The copper grade is 0.90%, the cobalt grade is 0.68%, and the oxidation rate is 83.72%. In this comparative example, the treatment process for the high-oxidation-rate, high-cobalt, low-copper sulfur-oxygen composite copper-cobalt ore, compared with the method of the present invention, omits the ore blending step, that is, no high-copper, low-cobalt copper-cobalt ore and cobalt concentrate are added. The specific process flow is as follows:

[0152] (1) Crushing and grinding of high oxidation rate, high cobalt and low copper composite copper-cobalt ore, adding reagents to the obtained pulp for desulfurization to obtain copper sulfide concentrate and high copper tailings;

[0153] (2) Leaching of high copper tailings, including first-stage leaching and second-stage intensified leaching; after the first-stage leaching of the mixed ore, thickening and separation are carried out to obtain underflow pulp and first-stage leaching solution; the underflow pulp is subjected to second-stage intensified leaching, and the leaching residue and second-stage leaching solution are separated; the leaching residue is washed by 5-stage countercurrent washing to obtain washing solution; the first-stage leaching solution, the second-stage leaching solution and the washing solution are subjected to extraction to obtain copper-rich solution and cobalt-containing raffinate;

[0154] The copper sulfide concentrate is subjected to oxygen-enriched roasting, acid leaching-direct electrowinning to produce cathode copper; the copper-rich solution enters the electrowinning process to produce cathode copper, and the cobalt-containing raffinate enters the iron removal and cobalt precipitation process to produce crude cobalt hydroxide.

[0155] Among them, the particles with a fineness of -0.074mm after grinding account for 81wt%, and the mass percentage concentration of the pulp is 31wt%.

[0156] The desulfurization process consumes 208g / t of butyl xanthate (collector) and 49g / t of pine oil (foaming agent) for the pulp.

[0157] The pH value of the first-stage leaching is 1.5, the oxidation-reduction potential is 385 - 395mV, the liquid-solid ratio is controlled at 5 - 6:1, and the leaching time is 5h - 7h. The pH value of the second-stage intensified leaching is 1.7 - ɼ.8, steam is introduced for heating, the leaching temperature is 55 - 60°C, the liquid-solid ratio is controlled at 3 - 4:1, the oxidation-reduction potential is 310 - 330mV, and the leaching time is 5h - 7h. The leaching agents used in the first-stage leaching and the second-stage intensified leaching contain iron, sodium metabisulfite and sulfuric acid, and the iron content is 1.0 - 2.0g / L.

[0158] The extractant used for extraction is Lix984N.

[0159] The pH value during the washing process is controlled within the range of 1.6 - 1.8.

[0160] The beneficiation process indexes of this comparative example are as follows:

[0161] Product Name Yield / % Cu Grade / % Co Grade / % Cu Recovery Rate / % Co Recovery Rate / % Copper Sulfide Concentrate 0.05 61.13 0.36 3.40 0.03 High-Copper Tailings 99.95 0.87 0.68 96.60 99.97

[0162] In Comparative Example 2, the original ore has a copper grade of 0.90%, a cobalt grade of 0.68%, an oxidation rate of 83.72%, and a yield of 0.05% can be obtained. The copper sulfide concentrate has a copper grade of 61.13%, a cobalt grade of 0.36%, a copper recovery rate of 3.40%, and a cobalt recovery rate of 0.03%; the output of high copper tailings is 99.95%, the copper grade is 0.87%, the cobalt grade is 0.68%, the copper recovery rate is 96.60%, and the cobalt recovery rate is 99.97%.

[0163] The obtained high-copper tailings are leached, with a copper leaching rate of 88.50% and a cobalt leaching rate of 8.97%. The obtained copper sulfide concentrate is roasted to obtain copper sulfide concentrate calcine through a conventional smelting process and then treated through a conventional leaching process, with a copper leaching rate of 97.9% and a cobalt leaching rate of 88.2%.

[0164] The total copper recovery rate of this combined beneficiation and metallurgy process is 88.50%, and the total cobalt recovery rate is 9.01%.

[0165] If all the involved minerals are processed according to the conventional beneficiation, smelting, grinding, and leaching process flow, the total copper recovery rate is 86.30%, and the total cobalt recovery rate is 5.50%. This comparative example can increase the comprehensive copper recovery rate by 2.20% and the cobalt recovery rate by 3.51% compared with the conventional treatment process, showing a certain improvement. However, due to the lack of the ore blending technology of the present invention, the improvement effect is limited, and overall, the cobalt recovery rate is at a very low level.

[0166] Comparative Example 3

[0167] Comparative Example 3 does not use the high-oxidation-rate, high-cobalt, low-copper sulfur-oxygen composite copper-cobalt ore and processes the copper-cobalt ore with high copper and low cobalt. The high-copper, low-cobalt copper-cobalt ore used is from the same batch as that in Example 1 and is similar in composition, but there are slight differences in ore data due to different specific samples extracted. The copper grade is 5.2%, the cobalt grade is 0.14%, the copper oxidation rate is 86.21%, and the cobalt oxidation rate is 100%. The treatment process of this comparative example is as follows. Compared with the method of the present invention, the ore blending step is omitted, that is, the high-oxidation-rate, high-cobalt, low-copper sulfur-oxygen composite copper-cobalt ore and cobalt concentrate are not incorporated. The specific process flow is as follows:

[0168] (1) The high-copper, low-cobalt copper-cobalt ore is crushed and ground, and the obtained pulp is added with reagents for desulfurization to obtain copper sulfide concentrate and high-copper tailings.

[0169] (2) The high-copper tailings are leached, and the leaching includes first-stage leaching and second-stage enhanced leaching. After the first-stage leaching of the mixed ore, thickening and separation are carried out to obtain underflow pulp and first-stage leaching solution. The underflow pulp is subjected to second-stage enhanced leaching, and the leaching residue and second-stage leaching solution are separated. The leaching residue is washed through 5-stage countercurrent washing to obtain washing solution. The first-stage leaching solution, second-stage leaching solution, and washing solution are subjected to extraction to obtain copper-rich solution and cobalt-containing raffinate.

[0170] The copper sulfide concentrate is roasted in oxygen-enriched atmosphere, acid-leached, and directly electrowon to produce cathode copper. The copper-rich solution enters the electrowinning process to produce cathode copper, and the cobalt-containing raffinate enters the iron-removing and cobalt-precipitating process to produce crude cobalt hydroxide.

[0171] Among them, the particles with a fineness of -0.074 mm after grinding account for 83 wt%, and the mass percentage concentration of the pulp is 32%.

[0172] The desulfurization process consumes 211 g / t of pulp of butyl xanthate (collector) and 48 g / t of pulp of pine oil (foaming agent).

[0173] For the first-stage leaching, the pH value is 1.6, the oxidation-reduction potential is 380 - 390 mV, the liquid-solid ratio is controlled at 5 - 6:1, and the leaching time is 5 h - 7 h. For the second-stage intensified leaching, the pH value is 1.8 - 1.9, steam is introduced to raise the temperature, the leaching temperature is 55 - 60 °C, the liquid-solid ratio is controlled at 3 - 4:1, the oxidation-reduction potential is 300 - 320 mV, and the leaching time is 5 h - 7 h. The leaching agent used in the first-stage leaching and the second-stage intensified leaching contains iron, sodium metabisulfite and sulfuric acid, with iron content of 1.0 - 2.0 g / L.

[0174] The pH value during the washing process is controlled within the range of 1.7 - 1.9.

[0175] The ore dressing process indexes of this comparative example are as follows:

[0176] Product Name Yield / % Cu Grade / % Co Grade / % Cu Recovery Rate / % Co Recovery Rate / % Copper Sulfide Concentrate 0.89 63.2 0.15 10.82 0.95 High-Copper Tailings 99.11 4.68 0.14 89.18 99.05

[0177] In Comparative Example 3, the original ore has a copper grade of 5.2%, a cobalt grade of 0.14%, an oxidation rate of 86.21%, and a yield of 0.89%. The copper sulfide concentrate obtained has a copper grade of 63.2%, a cobalt grade of 0.15%, a copper recovery rate of 10.82%, and a cobalt recovery rate of 0.95%. The high-copper tailings have a yield of 99.11%, a copper grade of 4.68%, a cobalt grade of 0.14%, a copper recovery rate of 89.18%, and a cobalt recovery rate of 99.05%.

[0178] The obtained high-copper tailings are leached, and the copper leaching rate is 92.30% and the cobalt leaching rate is 89.78%. The obtained copper sulfide concentrate is processed through a conventional smelting process to obtain copper sulfide concentrate calcine, which is then processed through a conventional leaching process. The copper leaching rate is 98.15% and the cobalt leaching rate is 95.42%.

[0179] The extractant used for extraction is Lix984N.

[0180] The total copper recovery rate of this process is 92.35%, and the total cobalt recovery rate is 89.83%.

[0181] If all the minerals involved are processed according to the conventional ore dressing, smelting, grinding and leaching process flow, the total copper recovery rate is 86.80% and the total cobalt recovery rate is 81.30%. This comparative example can increase the comprehensive copper recovery rate by 5.55% and the cobalt recovery rate by 8.53% compared with the conventional treatment process. Compared with Examples 1 - 3 of this application, the total copper recovery rate is about 92% for all, which is basically equivalent, indicating that the method of the present invention does not sacrifice the copper leaching rate of copper-cobalt ore with high copper and low cobalt. In this comparative example, although the total cobalt recovery rate is higher than that of Examples 1 - 3 of the present invention, the cobalt grade of the copper-cobalt ore with high copper and low cobalt processed in this comparative example is only 0.14%. In comparison, the improvement in the cobalt recovery rate brought by the present invention to the high-oxidation-rate, high-cobalt and low-copper sulfide-oxide composite copper-cobalt ore significantly increases the total cobalt recovery rate.

Claims

1. A combined beneficiation and smelting treatment process for a high oxidation rate, high cobalt and low copper composite copper-cobalt ore, characterized in that, Mix the high-oxidation-rate, high-cobalt, low-copper composite copper-cobalt ore with the high-copper, low-cobalt copper-cobalt ore, and grind them; Add reagents to the obtained ore pulp for desulfurization to obtain copper sulfide concentrate and high-copper tailings; The reagents include a collector and / or a foaming agent; Mix the high-copper tailings with cobalt concentrate to obtain a mixed ore; Leach to obtain a leachate and a leached residue; The washing liquid obtained by pickling the leached residue and / or the leachate are subjected to extraction to obtain a copper-rich liquid and a cobalt-containing raffinate; Copper elements are enriched in the copper-rich liquid, and cobalt elements are enriched in the cobalt-containing raffinate; The cobalt grade of the high-oxidation-rate, high-cobalt, low-copper composite copper-cobalt ore is 0.2 wt% - 1.0 wt%, the copper grade is 0.3 wt% - 1.8 wt%, and the oxidation rate is above 80%; Among the cobalt-containing minerals in the high-oxidation-rate, high-cobalt, low-copper composite copper-cobalt ore, more than 95 wt% is cobalt oxide; The copper grade of the high-copper, low-cobalt copper-cobalt ore is 3 wt% - 10 wt%, the cobalt grade is below 0.2 wt%, and the oxidation rate is above 80%; The copper grade of the cobalt concentrate is 2 wt% - 7 wt%, and the cobalt grade is 0.18 wt% - 0.8 wt%; The leaching agent used for leaching contains iron, sodium metabisulfite and sulfuric acid, and the pH value is 1 - 2.

2. The combined beneficiation and smelting treatment process for high-oxidation-rate, high-cobalt and low-copper composite copper-cobalt ore according to claim 1, characterized in that, The cobalt grade of the high-oxidation-rate, high-cobalt, low-copper composite copper-cobalt ore is 0.4 wt% - 0.8 wt%, the copper grade is 0.6 wt% - 1.5 wt%, and the oxidation rate is above 85%; The gangue components include more than three of SiO2, CaO, MgO, K2O, and Al2O3; Among the copper-containing minerals in the high-oxidation-rate, high-cobalt, low-copper composite copper-cobalt ore, more than 70 wt% is secondary copper sulfide and / or combined copper oxide; Among the cobalt-containing minerals in the high-oxidation-rate, high-cobalt, low-copper composite copper-cobalt ore, more than 97 wt% is cobalt oxide; The copper grade of the high-copper, low-cobalt copper-cobalt ore is 5 wt% - 7 wt%, the cobalt grade is 0.06 wt% - 0.15 wt%, and the oxidation rate is above 85%; The weight ratio of the high-oxidation-rate, high-cobalt, low-copper composite copper-cobalt ore to the high-copper, low-cobalt copper-cobalt ore for ore blending is 1:0.6 - 1.

5.

3. The combined beneficiation and smelting treatment process for high oxidation rate, high cobalt and low copper composite copper-cobalt ore according to claim 1, characterized in that, The grinding is as follows: Grind to a fineness where the mineral particles of -0.074 mm account for 70 wt% - 85 wt%; The concentration of the ore pulp obtained by grinding is 25 wt% - 35 wt%; The dosage of the collector is 190 g / t ore pulp - 220 g / t ore pulp; The dosage of the foaming agent is 45 g / t ore pulp - 55 g / t ore pulp.

4. The combined beneficiation and smelting treatment process for high-oxidation-rate, high-cobalt and low-copper composite copper-cobalt ore according to claim 1 or 3, characterized in that, The collector includes butyl xanthate; The foaming agent includes pine oil.

5. The beneficiation and smelting combined treatment process of the high oxidation rate, high cobalt and low copper composite copper-cobalt ore according to claim 1, characterized in that, The copper grade of the cobalt concentrate is 3.2 wt% - 6.5 wt%, and the cobalt grade is 0.2 wt% - 0.7 wt%; The weight ratio of the high-copper tailings to the cobalt concentrate for ore blending is 70 - 75:30 - 25.

6. The combined beneficiation and smelting treatment process for high oxidation rate, high cobalt and low copper composite copper-cobalt ore according to claim 1 or 5, characterized in that, The cobalt concentrate consists of flotation cobalt concentrate and magnetic separation cobalt concentrate in a weight ratio of 3 - 4:1; The copper grade of the flotation cobalt concentrate is 4.0 wt% - 7.0 wt%, and the cobalt grade is 0.2 wt% - 0.6 wt%; The copper grade of the magnetic separation cobalt concentrate is 1.5 wt% - 3.0 wt%, and the cobalt grade is 0.3 wt% - 0.8 wt%.

7. The combined beneficiation and smelting treatment process for high oxidation rate, high cobalt and low copper composite copper-cobalt ore according to claim 1, characterized in that, The leaching process includes first-stage leaching and second-stage enhanced leaching; after the first-stage leaching, separation is carried out to obtain underflow pulp and first-stage leaching solution; the underflow pulp is subjected to second-stage enhanced leaching, and separation is carried out to obtain leaching residue and second-stage leaching solution; the first-stage leaching solution and / or the second-stage leaching solution are used for subsequent extraction processes.

8. The combined beneficiation and smelting treatment process for high-oxidation-rate, high-cobalt and low-copper composite copper-cobalt ore according to claim 7, characterized in that, During the first-stage leaching, the pH value is 1.2 - 1.8, and the redox potential is 380 mV - 450 mV; during the second-stage enhanced leaching, the pH value is 1.6 - 2.0, the redox potential is 300 mV - 350 mV, and the temperature is 50°C - 65°C.

9. The combined beneficiation and smelting treatment process for high oxidation rate, high cobalt and low copper composite copper-cobalt ore according to claim 7 or 8, characterized in that, During the first-stage leaching, the liquid-solid ratio of the leaching system formed after adding the leaching agent is 5 - 6:1; the leaching time of the first-stage leaching is 5 h - 7 h; during the second-stage enhanced leaching, the liquid-solid ratio of the leaching system formed after adding the leaching agent is 3 - 4:1; the leaching time of the second-stage enhanced leaching is 5 h - 7 h.

10. The combined beneficiation and smelting treatment process for high-oxidation-rate, high-cobalt and low-copper composite copper-cobalt ore according to claim 7, characterized in that, The leaching agent contains iron element with a concentration of 0.5 g / L - 2.5 g / L; the pH value of the washing solution used for pickling the leaching residue is 1.5 - 2.0; the extractant for the extraction is Lix984N.

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