Method for Joint Treatment of Copper Cobalt Sulfide Ore and Cobalt Oxide Ore

Abstract

The present invention provides a method for jointly treating copper-cobalt sulfide ore and cobalt oxide ore. The method includes: mixing the copper-cobalt sulfide ore and the cobalt oxide ore to obtain a mixed ore material; mixing the mixed ore material with a sulfur-fixing agent and roasting to obtain roasted ore; mixing the roasted ore with water and sulfuric acid for oxygen pressure leaching to obtain a leaching material, and after solid-liquid separation, obtaining a copper-cobalt leaching solution and a leaching residue. The present invention combines roasting and oxygen pressure leaching for the joint treatment of copper-cobalt sulfide ore and cobalt oxide ore. The low-valent sulfide thermally decomposed from the copper-cobalt sulfide ore can reduce the high-valent cobalt in the cobalt oxide ore to low-valent cobalt that is easily soluble in acidic solution, reducing the consumption of reducing agents and lowering the treatment cost. Basically, no sulfur dioxide is generated during the roasting process. At the same time, by adopting the oxygen pressure leaching process, the leaching rates of copper and cobalt are significantly increased. It is a method for jointly treating copper-cobalt sulfide ore and cobalt oxide ore with low production cost, small environmental pollution, and high leaching rates of copper and cobalt.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrometallurgy, and in particular, to a method for jointly treating copper-cobalt sulfide ore and cobalt oxide ore. Background Art

[0002] With the continuous mining of cobalt minerals, the resources of high-grade and easily treatable cobalt oxide ores are decreasing day by day, and the difficult-to-treat copper-cobalt sulfide ores have become the current research hotspot. Copper and cobalt, as associated resources, generally exist in the form of copper-cobalt sulfide ores. Copper-cobalt sulfide minerals are difficult to dissolve in sulfuric acid under normal pressure, so it is very difficult to recover copper-cobalt sulfide minerals only by the process of direct leaching of the original ore, resulting in a low leaching rate of copper and cobalt. At the same time, some copper-cobalt sulfide ores also contain a large amount of alkaline gangue minerals such as high-calcium and high-magnesium dolomite. When directly leached, the acid consumption is high and the production cost remains high. In addition, due to the low cobalt grade of the ore, the occurrence minerals are complex, and the dissemination particle size is extremely fine, it cannot be efficiently recovered.

[0003] In the process of treating copper-cobalt ore, the "sulfation roasting - atmospheric pressure acid leaching" process is generally used to initially recover copper and cobalt. However, in the process of treating copper-cobalt sulfide concentrate by this process, affected by the change of ore composition and the roasting operation level, there is still a large amount of copper and cobalt in the leaching residue, resulting in a high loss rate of copper and cobalt.

[0004] Chinese application CN 110229958 A discloses a method for low-temperature roasting and gradient recovery of copper, cobalt and zinc from sulfur concentrate, in which the sulfur concentrate is subjected to low-temperature roasting and atmospheric pressure leaching at both ends to obtain a copper-cobalt solution, which still belongs to the traditional "sulfation roasting - atmospheric pressure acid leaching" treatment process for sulfur concentrate. Chinese application CN 113789441 A discloses a combined leaching process for cobalt sulfur concentrate and cobalt hydroxide ore, in which the cobalt sulfur concentrate and cobalt hydroxide ore are leached jointly under high pressure, but there are problems such as low leaching rates of cobalt and copper metals.

[0005] Therefore, in the current treatment methods of copper-cobalt sulfide minerals, pyrometallurgy will produce a large amount of sulfur dioxide, with large environmental protection investment and prominent environmental pollution problems. At the same time, there are problems such as low recovery rate of valuable metals; biological leaching method is mostly used to treat low-grade raw materials; and the hydrometallurgy process combining roasting and atmospheric pressure leaching will also produce sulfur dioxide during the roasting process, and some cobalt is prone to form high-valent cobalt during the roasting process, and the leaching rates of cobalt and copper metals are still not high. Summary of the Invention

[0006] The main object of the present invention is to provide a method for jointly treating copper-cobalt sulfide ore and cobalt oxide ore, so as to solve the problems of high production cost, large environmental pollution and low leaching rates of copper and cobalt in the roasting process of copper-cobalt sulfide ore in the prior art.

[0007] To achieve the above object, according to one aspect of the present invention, a method for jointly treating copper-cobalt sulfide ore and cobalt oxide ore is provided, comprising the following steps: Step S1, mixing the copper-cobalt sulfide ore and the cobalt oxide ore for ore blending to obtain a mixed ore material; Step S2, mixing the mixed ore material with a sulfur-fixing agent and then roasting to obtain roasted ore; Step S3, mixing the roasted ore with water and sulfuric acid and then performing oxygen pressure leaching to obtain leaching materials; Step S4, separating the solid and liquid of the leaching materials to obtain a copper-cobalt leaching solution and leaching residues.

[0008] Further, the weight ratio of the copper-cobalt sulfide ore to the cobalt oxide ore is 1:(1.5 - 3).

[0009] Further, by weight percentage, in the copper-cobalt sulfide ore, the content of Cu is 15 - 25 wt.%, the content of Co is 8 - 15 wt.%, the content of Fe is 6 - 15 wt.%, the content of Mg is 2 - 5.5 wt.%, and the content of S is 15 - 21 wt.%; preferably, the particle size of the copper-cobalt sulfide ore is ≤ 0.15 mm; and / or by weight percentage, in the cobalt oxide ore, the content of Cu is 0.5 - 2.5 wt.%, the content of Co is 8 - 16 wt.%, the content of Fe is 0.5 - 2.5 wt.%, the content of Mg is 0.2 - 1.3 wt.%, and the content of S is 0 - 0.4 wt.%; preferably, the particle size of the cobalt oxide ore is ≤ 0.15 mm.

[0010] Further, the weight ratio of Co in the copper-cobalt sulfide ore to Co in the cobalt oxide ore is 1:(1.5 - 4); and / or the weight ratio of S in the copper-cobalt sulfide ore to Co in the cobalt oxide ore is 1:(0.02 - 0.06).

[0011] Further, the sulfur-fixing agent includes one or more of sodium carbonate, sodium sulfate, and sodium chloride; and / or the weight ratio of the copper-cobalt sulfide ore to the sulfur-fixing agent is 1:(0.2 - 0.6).

[0012] Further, the roasting temperature is 350 - 600 °C and the time is 1 - 4 h.

[0013] Further, the acid-ore ratio of the oxygen pressure leaching is 150 - 250 kg / t, and the liquid-solid ratio is (3 - 8):1.

[0014] Further, the partial oxygen pressure of the oxygen pressure leaching is 0.2 - 1.0 MPa; and / or the temperature of the oxygen pressure leaching is 180 - 240 °C and the time is 1 - 4 h.

[0015] Further, when the weight percentage of S in the mixed ore is 4.0 - 5.5 wt.%, the roasting temperature is 350 - 450 °C; when the weight percentage of S in the mixed ore is greater than 5.5 wt.% and less than or equal to 8.5 wt.%, the roasting temperature is greater than 450 °C and less than or equal to 600 °C.

[0016] Further, when the weight ratio of S in the copper-cobalt sulfide ore to Co in the cobalt oxide ore is 1:(0.02 - 0.04), the oxygen partial pressure for oxygen pressure leaching is 0.2 - 0.5 MPa; when the weight ratio of S in the copper-cobalt sulfide ore to Co in the cobalt oxide ore is less than 1:0.04 and greater than or equal to 1:0.06, the oxygen partial pressure for oxygen pressure leaching is greater than 0.5 MPa and less than or equal to 1 MPa.

[0017] Applying the technical solution of the present invention, roasting is combined with oxygen pressure leaching for the combined treatment of copper-cobalt sulfide ore and cobalt oxide ore. Through roasting, the sulfides in the copper-cobalt sulfide ore are converted into soluble sulfates, and the low-valent sulfides thermally decomposed can reduce the high-valent cobalt in the cobalt oxide ore to low-valent cobalt that is easily soluble in acidic solution, which can reduce the consumption of solid sulfur reducing agents in the leaching process of treating cobalt oxide ore alone, thereby significantly reducing the treatment cost of copper-cobalt sulfide ore and cobalt oxide ore; since the sulfides are used in the cobalt reduction process, sulfur dioxide is basically not generated during the roasting process, thus significantly reducing the environmental pollution during the mineral treatment process. At the same time, by adopting the oxygen pressure leaching process, the remaining sulfur in the roasted ore enters the slag or solution in the form of sulfate ions, and due to the combined roasting treatment of copper-cobalt sulfide ore and cobalt oxide ore in the previous step, the sulfate ion balance is good during the oxygen pressure leaching process, and no obvious excess sulfuric acid is generated, which can significantly improve the leaching rates of copper and cobalt and reduce the loss of copper and cobalt in the mineral raw materials. The method of the present invention is a combined treatment method for copper-cobalt sulfide ore and cobalt oxide ore with low production cost, small environmental pollution, and high leaching rates of copper and cobalt, and the product has high added value and broad application prospects. Detailed Embodiments

[0018] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the embodiments.

[0019] Term Explanation:

[0020] Acid-ore ratio: The ratio of the total weight of the acid solution (unit: kg) used in the leaching process to the weight of the material to be leached (unit: t).

[0021] Liquid-solid ratio: The ratio of the weight of the liquid to the weight of the solid material in the pulp of the leaching process.

[0022] As described in the background art of the present invention, in the prior art, there are problems such as high production cost, large environmental pollution, and low leaching rates of copper and cobalt during the roasting process of copper cobalt sulfide ore. To solve the above problems, in a typical embodiment of the present invention, a method for jointly treating copper cobalt sulfide ore and cobalt oxide ore is provided, including the following steps: Step S1, mixing copper cobalt sulfide ore and cobalt oxide ore for ore blending to obtain a mixed ore material; Step S2, mixing the mixed ore material with a sulfur-fixing agent and then roasting to obtain roasted ore; Step S3, mixing the roasted ore with water and sulfuric acid and then performing oxygen pressure leaching to obtain a leaching material; Step S4, performing solid-liquid separation on the leaching material to obtain a copper cobalt leaching solution and a leaching residue.

[0023] The present invention combines roasting and oxygen pressure leaching to jointly treat copper cobalt sulfide ore and cobalt oxide ore, realizing the efficient extraction of copper and cobalt. After blending copper cobalt sulfide ore and cobalt oxide ore and then roasting, during the process where sulfides in copper cobalt sulfide ore are converted into soluble sulfates by roasting, the low-valent sulfides thermally decomposed (products of the roasting process) can reduce the high-valent cobalt in cobalt oxide ore to low-valent cobalt that is easily soluble in acidic solution. In the above process, on the one hand, copper cobalt sulfide ore is used as a reducing agent for cobalt oxide ore in a disguised form, which can not only achieve the efficient roasting of valuable metals in the two ores, but also reduce the consumption of the reducing agent (also called sulfur-fixing agent) required for separately treating cobalt oxide ore, thereby significantly reducing the treatment cost of copper cobalt sulfide ore and cobalt oxide ore. On the other hand, by internally utilizing the sulfur in copper cobalt sulfide ore, sulfur dioxide is basically not generated during the roasting process, solving the problem of sulfur dioxide overflow during the roasting process of copper cobalt sulfide ore, and thus significantly reducing environmental pollution during the mineral treatment process.

[0024] Then, the roasted ore obtained from the roasting process is added to an autoclave, and oxygen is simultaneously introduced to treat the roasted ore using the oxygen pressure leaching process, so that the remaining sulfur in the roasted ore enters the slag or solution in the form of sulfate radicals, further avoiding the generation of sulfur dioxide. Compared with the atmospheric pressure leaching process, the oxygen pressure leaching process can further solve the problem of relatively high copper and cobalt contents in the leaching residue. And because the copper cobalt sulfide ore and cobalt oxide ore have been jointly roasted in the previous steps, the sulfate radical balance is good during the oxygen pressure leaching process, and no obvious excess sulfuric acid will be generated. At the same time, the leaching rates of copper and cobalt are significantly increased, the losses of copper and cobalt in the mineral raw materials are reduced, and the generated ferric sulfate (Fe2(SO4)3) with low reaction activity can be used to inhibit the leaching of iron, reducing the pressure of iron removal from the solution and the loss of valuable metals. Finally, solid-liquid separation is performed on the leaching material, which can be carried out by methods such as suction filtration, pressure filtration, and bag filtration to obtain a copper cobalt leaching solution and a leaching residue. The main metal elements in the copper cobalt leaching solution are copper and cobalt, and the main metal element in the leaching residue is iron. When using the method of the present invention to treat copper cobalt sulfide ore and cobalt oxide ore, the total copper leaching rate ≥ 96%, the total cobalt leaching rate ≥ 96%, and the total iron leaching rate ≤ 1.8%.

[0025] In a preferred embodiment, the weight ratio of copper cobalt sulfide ore to cobalt oxide ore is 1:(1.5 - 3). When the dosage ratio of copper cobalt sulfide ore to cobalt oxide ore is within the above range, it is beneficial to make the sulfide and oxide contact and react more fully during the roasting process.

[0026] In a preferred embodiment, by weight percentage, in the copper cobalt sulfide ore, the content of Cu is 15 - 25 wt.%, the content of Co is 8 - 15 wt.%, the content of Fe is 6 - 15 wt.%, the content of Mg is 2 - 5.5 wt.%, and the content of S is 15 - 21 wt.%; preferably, the particle size of the copper cobalt sulfide ore ≤ 0.15 mm; and / or by weight percentage, in the cobalt oxide ore, the content of Cu is 0.5 - 2.5 wt.%, the content of Co is 8 - 16 wt.%, the content of Fe is 0.5 - 2.5 wt.%, the content of Mg is 0.2 - 1.3 wt.%, and the content of S is 0 - 0.4 wt.%; preferably, the particle size of the cobalt oxide ore ≤ 0.15 mm.

[0027] The high content of sulfur and appropriate amounts of copper and cobalt in the copper cobalt sulfide ore can enable sulfur to thermally decompose in the form of low - valence sulfide during the roasting process, and act as a reducing agent to reduce the higher - valence cobalt in the cobalt oxide ore to a lower valence state, which is easy to acid leach. At the same time, controlling the content of basic gangue minerals such as Ca and Mg in the cobalt oxide ore within a lower range can further reduce the influence on the acid leaching process and avoid an increase in acid consumption. The low content of iron helps to inhibit its leaching during oxygen pressure leaching and reduces the pressure of iron removal from the solution. By limiting the composition of the two ores within the above range, not only can the metal recovery rate be improved and metal loss be reduced, but also the chemical balance in the process can be improved, energy consumption and costs can be reduced, and an environmentally friendly, economical and efficient combined treatment effect can be achieved.

[0028] In a preferred embodiment, the weight ratio of Co in the copper cobalt sulfide ore to Co in the cobalt oxide ore is 1:(1.5 - 4); and / or the weight ratio of S in the copper cobalt sulfide ore to Co in the cobalt oxide ore is 1:(0.02 - 0.06). The above conditions can improve the desulfurization rate and the reduction efficiency of valuable metals, thereby further reducing the generation and overflow of sulfur dioxide during the roasting process and reducing the dosage of solid sulfur reducing agent in the separate treatment of the oxide leaching process; at the same time, when the roasted material is subjected to oxygen pressure leaching, the leaching rate of copper and cobalt metals is further increased, thereby reducing the overall production cost and improving the economic benefits.

[0029] To enable the sulfur-fixing agent (reducing agent / oxidation promoter) to more fully promote the conversion of sulfides into soluble sulfates during roasting and simultaneously play a sulfur-fixing role (making it less likely to escape), in a preferred embodiment, the sulfur-fixing agent includes one or more of sodium carbonate, sodium sulfate, and sodium chloride; and / or the weight ratio of copper-cobalt sulfide ore to the sulfur-fixing agent is 1:(0.2 - 0.6). Moreover, compared with the conventionally used additives, these types of compounds can, while fixing sulfur and promoting the efficient recovery of valuable metals, more effectively control the roasting temperature and reduce the energy consumption during roasting. The use amount of the sulfur-fixing agent within the above range can further improve the oxidation efficiency of sulfides, reduce sulfur dioxide emissions and environmental pollution, and can reduce costs by using a low dose.

[0030] For the purpose of more favorably promoting the effective oxidation of sulfides, simultaneously promoting the reduction of cobalt in cobalt oxide ore, and improving the resource recovery rate, in a preferred embodiment, the roasting temperature is 350 - 600 °C and the time is 1 - 4 h. Under the above temperature and time conditions, high-efficiency desulfurization and metal reduction can be achieved on the basis of lower energy consumption, while reducing the increased energy consumption and equipment loss caused by too high temperature, further improving the reaction completeness, being conducive to improving the metal recovery rate, reducing production costs, and achieving a double improvement in environmental protection and economic benefits.

[0031] In a preferred embodiment, the acid-to-ore ratio of oxygen pressure leaching is 150 - 250 kg / t, and the liquid-to-solid ratio is (3 - 8):1; preferably, the oxygen pressure leaching is carried out under stirring, and the stirring speed is 700 - 900 r / min. That is, the ratio of the total weight of the acid solution used in oxygen pressure leaching to the weight of the roasted ore to be leached is 150 - 250 kg / t. The above conditions can enable the solid-liquid reaction in the leaching process to proceed more fully and improve the dissolution rate of copper and cobalt.

[0032] To further accelerate the dissolution of copper and cobalt and improve the leaching efficiency, in a preferred embodiment, the partial oxygen pressure of oxygen pressure leaching is 0.2 - 1.0 MPa; and / or the temperature of oxygen pressure leaching is 180 - 240 °C and the time is 1 - 4 h. By refining the leaching conditions within the above range, the leaching process can be more precisely controlled, the leaching rate of copper and cobalt can be improved, while suppressing the leaching of iron, reducing the acid consumption and the burden of iron removal from the solution, reducing sulfuric acid excess, lowering production costs and environmental protection pressure, improving product purity and metal recovery efficiency, improving process stability and economic feasibility, and laying a foundation for large-scale industrial application.

[0033] For the purpose of being more conducive to improving the metal recovery rate, in a preferred embodiment, the roasting temperature is higher than the temperature of oxidative pressure leaching, and the temperature difference is 150-400 °C. Such a temperature difference can enable the reduction reaction during roasting and the oxidative dissolution reaction during oxidative pressure leaching to proceed under optimal conditions respectively, achieving the best coordination between the roasting process and the oxidative pressure leaching process during the combined treatment process of copper-cobalt sulfide ore and copper-cobalt sulfide ore.

[0034] The synergistic effect of the preferred sulfur content and roasting conditions is conducive to effectively reducing cobalt and improving the leaching rate of copper and cobalt under different raw material conditions. In a preferred embodiment, when the weight percentage content of S in the mixed ore is 4.0-5.5 wt.%, the roasting temperature is 350-450 °C; when the weight percentage content of S in the mixed ore is greater than 5.5 wt.% and less than or equal to 8.5 wt.%, the roasting temperature is greater than 450 °C and less than or equal to 600 °C.

[0035] When the S in the mixed ore is in a higher range, a higher roasting temperature is preferably adopted. At this time, the sulfur in the copper-cobalt sulfide ore can be activated through a stronger thermal effect. The high sulfur content can provide sufficient low-valent sulfides as reducing agents to promote the effective reduction of high-valent cobalt in the cobalt oxide ore, reduce the dosage of reducing agents. At the same time, high-temperature roasting helps to make up for the insufficient oxidation power caused by the insufficient amount of cobalt oxide, promote the conversion of high-content S in the mixed ore, and achieve the efficient leaching of cobalt and copper, while controlling the leaching amount of iron, maintaining the balance of sulfate radicals, and reducing the complexity of subsequent treatment.

[0036] When the S in the mixed ore is in a lower range, a lower roasting temperature is preferably adopted. At this time, due to the low sulfur content, only less heat is needed to activate the sulfur in the copper-cobalt sulfide ore, providing reduction power for the cobalt oxide ore and improving the reduction efficiency of cobalt in the cobalt oxide ore. At the same time, the lower temperature can reduce the excessive volatilization of low-content sulfur, reduce energy consumption, and control the rate of the reduction reaction, thereby improving the recovery rates of cobalt and copper.

[0037] By precisely matching the S / Co ratio and the conditions of oxidative pressure leaching, it is conducive to achieving the efficient conversion and metal recovery of copper-cobalt sulfide ore and cobalt oxide ore during the combined treatment process. In a preferred embodiment, when the weight ratio of S in the copper-cobalt sulfide ore to Co in the cobalt oxide ore is 1:(0.02-0.04), the oxygen partial pressure of oxidative pressure leaching is 0.2-0.5 MPa; when the weight ratio of S in the copper-cobalt sulfide ore to Co in the cobalt oxide ore is less than 1:0.04 and greater than or equal to 1:0.06, the oxygen partial pressure of oxidative pressure leaching is greater than 0.5 MPa and less than or equal to 1 MPa.

[0038] When the ratio of S to Co is relatively high, it indicates that the sulfur in the copper-cobalt sulfide ore is sufficient to act as a reducing agent to reduce the high-valent cobalt in the cobalt oxide ore. However, due to the high S content and the good stability of sulfides, more severe oxygen pressure leaching conditions are required to promote the conversion of sulfur, strengthen the leaching process, and promote the full dissolution of copper-cobalt sulfide. A higher oxygen partial pressure can increase the reaction kinetics, promote the combination of metal ions in the ore with sulfate ions, achieve a higher metal leaching rate, maintain a good balance of sulfate ions in the solution, avoid the excess of sulfuric acid, and maintain the economy and environmental friendliness of the process.

[0039] When the ratio of S to Co is relatively low, it indicates that the proportion of sulfides is relatively small, and only mild oxygen pressure leaching conditions are required to effectively promote the leaching of copper and cobalt, while reducing unnecessary energy consumption, reducing the leaching of iron, thereby reducing the subsequent treatment cost and increasing the metal recovery rate and purity.

[0040] Typical but non-limiting, the weight ratio of copper-cobalt sulfide ore to cobalt oxide ore is 1:1.5, 1:1.8, 1:2.0, 1:2.2, 1:2.5, 1:2.8, 1:3 or a range value composed of any two of these values.

[0041] Typical but non-limiting, the weight ratio of Co in copper-cobalt sulfide ore to Co in cobalt oxide ore is 1:1.5, 1:2.0, 1:2.5, 1:3.0, 1:3.5, 1:4 or a range value composed of any two of these values.

[0042] Typical but non-limiting, the weight ratio of S in copper-cobalt sulfide ore to Co in cobalt oxide ore is 1:0.02, 1:0.03, 1:0.04, 1:0.05, 1:0.06 or a range value composed of any two of these values.

[0043] Typical but non-limiting, the weight ratio of copper-cobalt sulfide ore to the sulfur-fixing agent is 1:0.2, 1:0.3, 1:0.4, 1:0.5, 1:0.6 or a range value composed of any two of these values.

[0044] Typical but non-limiting, the roasting temperature is 350 °C, 400 °C, 450 °C, 500 °C, 550 °C, 600 °C or a range value composed of any two of these values.

[0045] Typical but non-limiting, the temperature of oxygen pressure leaching is 180 °C, 190 °C, 200 °C, 210 °C, 220 °C, 230 °C, 240 °C or a range value composed of any two of these values.

[0046] Typical but non-limiting, the oxygen partial pressure of oxygen pressure leaching is 0.2 MPa, 0.4 MPa, 0.6 MPa, 0.8 MPa, 1.0 MPa or a range value composed of any two of these values.

[0047] The present application will be further described in detail below in conjunction with specific embodiments, and these embodiments should not be construed as limiting the scope claimed by the present application.

[0048] Example 1

[0049] A method for jointly treating copper-cobalt sulfide ore and cobalt oxide ore. By weight percentage, in the copper-cobalt sulfide ore, the content of Cu is 20.72 wt.%, the content of Co is 11.70 wt.%, the content of Fe is 12.14 wt.%, the content of Mg is 3.89 wt.%, the content of S is 18.79 wt.%, and the particle size is ≤ 0.15 mm; by weight percentage, in the cobalt oxide ore, the content of Cu is 1.26 wt.%, the content of Co is 13.81 wt.%, the content of Fe is 1.82 wt.%, the content of Mg is 0.65 wt.%, the content of S is 0.20 wt.%, and the particle size is ≤ 0.15 mm; the method comprises the following steps:

[0050] Step S1: Mix 100 g of copper-cobalt sulfide ore with 300 g of cobalt oxide ore (weight ratio is 1:3) for ore blending to obtain a mixed ore material;

[0051] Step S2: Mix the mixed ore material with 40 g of sulfur-fixing agent (sodium carbonate) (weight ratio of copper-cobalt sulfide ore to sulfur-fixing agent is 1:0.4), and then carry out roasting (temperature is 500 °C, time is 2 h) to obtain roasted ore;

[0052] Step S3: Mix the roasted ore with water and sulfuric acid (acid-ore ratio is 200 kg / t, liquid-solid ratio is 5:1), and then carry out oxygen pressure leaching under stirring (stirring speed is 800 r / min, oxygen partial pressure is 0.4 MPa; temperature of oxygen pressure leaching is 200 °C, time is 2 h) to obtain leaching materials;

[0053] Step S4: Carry out solid-liquid separation on the leaching materials to obtain copper-cobalt leaching solution and leaching residue.

[0054] Example 2

[0055] A method for jointly treating copper-cobalt sulfide ore and cobalt oxide ore. The components of the copper-cobalt sulfide ore and the cobalt oxide ore are the same as those in Example 1; the method comprises the following steps:

[0056] Step S1: Mix 100 g of copper-cobalt sulfide ore with 150 g of cobalt oxide ore (weight ratio is 1:1.5) for ore blending to obtain a mixed ore material;

[0057] Step S2: Mix the mixed ore material with 40 g of sulfur-fixing agent (sodium carbonate) (weight ratio of copper-cobalt sulfide ore to sulfur-fixing agent is 1:0.4), and then carry out roasting (temperature is 500 °C, time is 2 h) to obtain roasted ore;

[0058] Step S3: Mix the roasted ore with water and sulfuric acid (the acid-to-ore ratio is 200 kg / t, and the liquid-to-solid ratio is 5:1), and then carry out oxygen pressure leaching under stirring (the stirring speed is 800 r / min, and the oxygen partial pressure is 0.4 MPa; the temperature of oxygen pressure leaching is 200 °C, and the time is 2 h) to obtain the leaching material.

[0059] Step S4: Carry out solid-liquid separation on the leaching material to obtain copper-cobalt leaching solution and leaching residue.

[0060] Example 3

[0061] A method for jointly treating copper-cobalt sulfide ore and cobalt oxide ore. The compositions of the copper-cobalt sulfide ore and the cobalt oxide ore are the same as those in Example 1. The method includes the following steps:

[0062] Step S1: Mix 100 g of copper-cobalt sulfide ore with 300 g of cobalt oxide ore (weight ratio is 1:3) for ore blending to obtain the mixed ore material.

[0063] Step S2: Mix the mixed ore material with 20 g of sulfur-fixing agent (sodium carbonate) (the weight ratio of copper-cobalt sulfide ore to sulfur-fixing agent is 1:0.2), and then carry out roasting (temperature is 500 °C, time is 2 h) to obtain the roasted ore.

[0064] Step S3: Mix the roasted ore with water and sulfuric acid (the acid-to-ore ratio is 200 kg / t, and the liquid-to-solid ratio is 5:1), and then carry out oxygen pressure leaching under stirring (the stirring speed is 800 r / min, and the oxygen partial pressure is 0.4 MPa; the temperature of oxygen pressure leaching is 200 °C, and the time is 2 h) to obtain the leaching material.

[0065] Step S4: Carry out solid-liquid separation on the leaching material to obtain copper-cobalt leaching solution and leaching residue.

[0066] Example 4

[0067] A method for jointly treating copper-cobalt sulfide ore and cobalt oxide ore. The compositions of the copper-cobalt sulfide ore and the cobalt oxide ore are the same as those in Example 1. The method includes the following steps:

[0068] Step S1: Mix 100 g of copper-cobalt sulfide ore with 300 g of cobalt oxide ore (weight ratio is 1:3) for ore blending to obtain the mixed ore material.

[0069] Step S2: Mix the mixed ore material with 40 g of sulfur-fixing agent (sodium sulfate) (the weight ratio of copper-cobalt sulfide ore to sulfur-fixing agent is 1:0.4), and then carry out roasting (temperature is 500 °C, time is 2 h) to obtain the roasted ore.

[0070] Step S3: Mix the roasted ore with water and sulfuric acid (acid-ore ratio is 200 kg / t, liquid-solid ratio is 5:1), and then carry out oxygen pressure leaching under stirring (stirring speed is 800 r / min, oxygen partial pressure is 0.4 MPa; the temperature of oxygen pressure leaching is 200 °C, and the time is 2 h) to obtain leaching materials;

[0071] Step S4: Carry out solid-liquid separation on the leaching materials to obtain copper-cobalt leaching solution and leaching residue.

[0072] Example 5

[0073] A method for jointly treating copper-cobalt sulfide ore and cobalt oxide ore. The compositions of the copper-cobalt sulfide ore and the cobalt oxide ore are the same as those in Example 1. The method includes the following steps:

[0074] Step S1: Mix 100 g of copper-cobalt sulfide ore with 300 g of cobalt oxide ore (weight ratio is 1:3) for ore blending to obtain mixed ore materials;

[0075] Step S2: Mix the mixed ore materials with 40 g of solid sulfur-fixing agent (sodium carbonate) (weight ratio of copper-cobalt sulfide ore to solid sulfur-fixing agent is 1:0.4), and then carry out roasting (temperature is 350 °C, time is 2 h) to obtain roasted ore;

[0076] Step S3: Mix the roasted ore with water and sulfuric acid (acid-ore ratio is 200 kg / t, liquid-solid ratio is 5:1), and then carry out oxygen pressure leaching under stirring (stirring speed is 800 r / min, oxygen partial pressure is 0.4 MPa; the temperature of oxygen pressure leaching is 200 °C, and the time is 2 h) to obtain leaching materials;

[0077] Step S4: Carry out solid-liquid separation on the leaching materials to obtain copper-cobalt leaching solution and leaching residue.

[0078] Example 6

[0079] A method for jointly treating copper-cobalt sulfide ore and cobalt oxide ore. The compositions of the copper-cobalt sulfide ore and the cobalt oxide ore are the same as those in Example 1. The method includes the following steps:

[0080] Step S1: Mix 100 g of copper-cobalt sulfide ore with 300 g of cobalt oxide ore (weight ratio is 1:3) for ore blending to obtain mixed ore materials;

[0081] Step S2: Mix the mixed ore materials with 40 g of solid sulfur-fixing agent (sodium carbonate) (weight ratio of copper-cobalt sulfide ore to solid sulfur-fixing agent is 1:0.4), and then carry out roasting (temperature is 600 °C, time is 2 h) to obtain roasted ore;

[0082] Step S3: Mix the roasted ore with water and sulfuric acid (acid-to-ore ratio is 200 kg / t, liquid-to-solid ratio is 5:1), and then carry out oxygen pressure leaching under stirring (stirring speed is 800 r / min, oxygen partial pressure is 0.4 MPa; the temperature of oxygen pressure leaching is 200 °C, and the time is 2 h) to obtain leaching materials;

[0083] Step S4: Carry out solid-liquid separation on the leaching materials to obtain copper-cobalt leaching solution and leaching residue.

[0084] Example 7

[0085] A method for jointly treating copper-cobalt sulfide ore and cobalt oxide ore, the compositions of the copper-cobalt sulfide ore and the cobalt oxide ore are the same as those in Example 1; the method includes the following steps:

[0086] Step S1: Mix 100 g of copper-cobalt sulfide ore with 300 g of cobalt oxide ore (weight ratio is 1:3) for ore blending to obtain mixed ore materials;

[0087] Step S2: Mix the mixed ore materials with 40 g of sulfur-fixing agent (sodium carbonate) (weight ratio of copper-cobalt sulfide ore to sulfur-fixing agent is 1:0.4), and then carry out roasting (temperature is 500 °C, time is 4 h) to obtain roasted ore;

[0088] Step S3: Mix the roasted ore with water and sulfuric acid (acid-to-ore ratio is 200 kg / t, liquid-to-solid ratio is 5:1), and then carry out oxygen pressure leaching under stirring (stirring speed is 800 r / min, oxygen partial pressure is 0.4 MPa; the temperature of oxygen pressure leaching is 200 °C, and the time is 2 h) to obtain leaching materials;

[0089] Step S4: Carry out solid-liquid separation on the leaching materials to obtain copper-cobalt leaching solution and leaching residue.

[0090] Example 8

[0091] A method for jointly treating copper-cobalt sulfide ore and cobalt oxide ore, the compositions of the copper-cobalt sulfide ore and the cobalt oxide ore are the same as those in Example 1; the method includes the following steps:

[0092] Step S1: Mix 100 g of copper-cobalt sulfide ore with 300 g of cobalt oxide ore (weight ratio is 1:3) for ore blending to obtain mixed ore materials;

[0093] Step S2: Mix the mixed ore materials with 40 g of sulfur-fixing agent (sodium carbonate) (weight ratio of copper-cobalt sulfide ore to sulfur-fixing agent is 1:0.4), and then carry out roasting (temperature is 500 °C, time is 2 h) to obtain roasted ore;

[0094] Step S3: Mix the roasted ore with water and sulfuric acid (acid-to-ore ratio is 150 kg / t, liquid-to-solid ratio is 5:1), and then carry out oxygen pressure leaching under stirring (stirring speed is 800 r / min, oxygen partial pressure is 0.4 MPa; the temperature of oxygen pressure leaching is 200 °C, and the time is 2 h) to obtain the leaching material.

[0095] Step S4: Carry out solid-liquid separation on the leaching material to obtain copper-cobalt leaching solution and leaching residue.

[0096] Example 9

[0097] A method for the combined treatment of copper-cobalt sulfide ore and cobalt oxide ore. The compositions of the copper-cobalt sulfide ore and cobalt oxide ore are the same as those in Example 1. The method includes the following steps:

[0098] Step S1: Mix 100 g of copper-cobalt sulfide ore with 300 g of cobalt oxide ore (weight ratio is 1:3) for ore blending to obtain the mixed ore material.

[0099] Step S2: Mix the mixed ore material with 40 g of sulfur-fixing agent (sodium carbonate) (weight ratio of copper-cobalt sulfide ore to sulfur-fixing agent is 1:0.4), and then carry out roasting (temperature is 500 °C, time is 2 h) to obtain the roasted ore.

[0100] Step S3: Mix the roasted ore with water and sulfuric acid (acid-to-ore ratio is 200 kg / t, liquid-to-solid ratio is 8:1), and then carry out oxygen pressure leaching under stirring (stirring speed is 800 r / min, oxygen partial pressure is 0.4 MPa; the temperature of oxygen pressure leaching is 200 °C, and the time is 2 h) to obtain the leaching material.

[0101] Step S4: Carry out solid-liquid separation on the leaching material to obtain copper-cobalt leaching solution and leaching residue.

[0102] Example 10

[0103] A method for the combined treatment of copper-cobalt sulfide ore and cobalt oxide ore. The compositions of the copper-cobalt sulfide ore and cobalt oxide ore are the same as those in Example 1. The method includes the following steps:

[0104] Step S1: Mix 100 g of copper-cobalt sulfide ore with 300 g of cobalt oxide ore (weight ratio is 1:3) for ore blending to obtain the mixed ore material.

[0105] Step S2: Mix the mixed ore material with 40 g of sulfur-fixing agent (sodium carbonate) (weight ratio of copper-cobalt sulfide ore to sulfur-fixing agent is 1:0.4), and then carry out roasting (temperature is 500 °C, time is 2 h) to obtain the roasted ore.

[0106] Step S3: Mix the calcine with water and sulfuric acid (acid-to-ore ratio is 200 kg / t, liquid-to-solid ratio is 5:1), and then carry out oxygen pressure leaching under stirring (stirring speed is 800 r / min, oxygen partial pressure is 0.4 MPa; the temperature of oxygen pressure leaching is 240 °C, and the time is 2 h) to obtain leaching materials;

[0107] Step S4: Carry out solid-liquid separation on the leaching materials to obtain copper-cobalt leaching solution and leaching residues.

[0108] Example 11

[0109] A method for jointly treating copper-cobalt sulfide ore and cobalt oxide ore, the compositions of the copper-cobalt sulfide ore and the cobalt oxide ore are the same as those in Example 1; the method comprises the following steps:

[0110] Step S1: Mix 100 g of copper-cobalt sulfide ore with 300 g of cobalt oxide ore (weight ratio is 1:3) for ore blending to obtain mixed ore materials;

[0111] Step S2: Mix the mixed ore materials with 40 g of solid sulfur-fixing agent (sodium carbonate) (weight ratio of copper-cobalt sulfide ore to solid sulfur-fixing agent is 1:0.4), and then carry out roasting (temperature is 500 °C, time is 2 h) to obtain calcine;

[0112] Step S3: Mix the calcine with water and sulfuric acid (acid-to-ore ratio is 200 kg / t, liquid-to-solid ratio is 5:1), and then carry out oxygen pressure leaching under stirring (stirring speed is 800 r / min, oxygen partial pressure is 0.4 MPa; the temperature of oxygen pressure leaching is 180 °C, and the time is 2 h) to obtain leaching materials;

[0113] Step S4: Carry out solid-liquid separation on the leaching materials to obtain copper-cobalt leaching solution and leaching residues.

[0114] Example 12

[0115] A method for jointly treating copper-cobalt sulfide ore and cobalt oxide ore, the compositions of the copper-cobalt sulfide ore and the cobalt oxide ore are the same as those in Example 1; the method comprises the following steps:

[0116] Step S1: Mix 100 g of copper-cobalt sulfide ore with 300 g of cobalt oxide ore (weight ratio is 1:3) for ore blending to obtain mixed ore materials;

[0117] Step S2: Mix the mixed ore materials with 40 g of solid sulfur-fixing agent (sodium carbonate) (weight ratio of copper-cobalt sulfide ore to solid sulfur-fixing agent is 1:0.4), and then carry out roasting (temperature is 500 °C, time is 2 h) to obtain calcine;

[0118] Step S3: Mix the roasted ore with water and sulfuric acid (acid-to-ore ratio is 200 kg / t, liquid-to-solid ratio is 5:1), and then carry out oxygen pressure leaching under stirring (stirring speed is 800 r / min, oxygen partial pressure is 1.0 MPa; the temperature of oxygen pressure leaching is 180 °C, and the time is 2 h) to obtain the leaching material.

[0119] Step S4: Carry out solid-liquid separation on the leaching material to obtain copper-cobalt leaching solution and leaching residue.

[0120] Example 13

[0121] A method for jointly treating copper-cobalt sulfide ore and cobalt oxide ore. The compositions of the copper-cobalt sulfide ore and the cobalt oxide ore are the same as those in Example 1. The method includes the following steps:

[0122] Step S1: Mix 100 g of copper-cobalt sulfide ore with 300 g of cobalt oxide ore (weight ratio is 1:3) for ore blending to obtain the mixed ore material.

[0123] Step S2: Mix the mixed ore material with 40 g of sulfur-fixing agent (sodium carbonate) (weight ratio of copper-cobalt sulfide ore to sulfur-fixing agent is 1:0.4), and then carry out roasting (temperature is 500 °C, time is 2 h) to obtain the roasted ore.

[0124] Step S3: Mix the roasted ore with water and sulfuric acid (acid-to-ore ratio is 200 kg / t, liquid-to-solid ratio is 5:1), and then carry out oxygen pressure leaching under stirring (stirring speed is 800 r / min, oxygen partial pressure is 0.4 MPa; the temperature of oxygen pressure leaching is 180 °C, and the time is 4 h) to obtain the leaching material.

[0125] Step S4: Carry out solid-liquid separation on the leaching material to obtain copper-cobalt leaching solution and leaching residue.

[0126] Example 14

[0127] A method for jointly treating copper-cobalt sulfide ore and cobalt oxide ore. The compositions of the copper-cobalt sulfide ore and the cobalt oxide ore are the same as those in Example 1. The method includes the following steps:

[0128] Step S1: Mix 100 g of copper-cobalt sulfide ore with 250 g of cobalt oxide ore for ore blending to obtain the mixed ore material.

[0129] Step S2: Mix the mixed ore material with 40 g of sulfur-fixing agent (sodium carbonate) (weight ratio of copper-cobalt sulfide ore to sulfur-fixing agent is 1:0.4), and then carry out roasting (temperature is 500 °C, time is 2 h) to obtain the roasted ore.

[0130] Step S3: Mix the calcine with water and sulfuric acid (acid-to-ore ratio is 200 kg / t, liquid-to-solid ratio is 6:1), and then carry out oxygen pressure leaching under stirring (stirring speed is 800 r / min, oxygen partial pressure is 0.6 MPa; the temperature of oxygen pressure leaching is 210 °C, and the time is 2 h) to obtain the leaching material.

[0131] Step S4: Carry out solid-liquid separation on the leaching material to obtain copper-cobalt leaching solution and leaching residue.

[0132] Example 15

[0133] A method for the combined treatment of copper-cobalt sulfide ore and cobalt oxide ore. By weight percentage, in the copper-cobalt sulfide ore, the content of Cu is 15 wt.%, the content of Co is 8 wt.%, the content of Fe is 6 wt.%, the content of Mg is 5.5 wt.%, the content of S is 15 wt.%, and the particle size is ≤ 0.15 mm; by weight percentage, in the cobalt oxide ore, the content of Cu is 0.5 wt.%, the content of Co is 8 wt.%, the content of Fe is 0.5 wt.%, the content of Mg is 1.3 wt.%, the content of S is 0 wt.%, and the particle size is ≤ 0.15 mm. The method includes the following steps:

[0134] Step S1: Mix 100 g of copper-cobalt sulfide ore with 250 g of cobalt oxide ore for ore blending to obtain the mixed ore material.

[0135] Step S2: Mix the mixed ore material with 20 g of solid sulfur-fixing agent (sodium carbonate) (weight ratio of copper-cobalt sulfide ore to solid sulfur-fixing agent is 1:0.2), and then carry out roasting (temperature is 350 °C, time is 4 h) to obtain the calcine.

[0136] Step S3: Mix the calcine with water and sulfuric acid (acid-to-ore ratio is 150 kg / t, liquid-to-solid ratio is 8:1), and then carry out oxygen pressure leaching under stirring (stirring speed is 800 r / min, oxygen partial pressure is 0.2 MPa; the temperature of oxygen pressure leaching is 180 °C, and the time is 4 h) to obtain the leaching material.

[0137] Step S4: Carry out solid-liquid separation on the leaching material to obtain copper-cobalt leaching solution and leaching residue.

[0138] Example 16

[0139] A method for the combined treatment of copper-cobalt sulfide ore and cobalt oxide ore. By weight percentage, in the copper-cobalt sulfide ore, the content of Cu is 25 wt.%, the content of Co is 15 wt.%, the content of Fe is 15 wt.%, the content of Mg is 2 wt.%, the content of S is 21 wt.%, and the particle size is ≤ 0.15 mm; by weight percentage, in the cobalt oxide ore, the content of Cu is 2.5 wt.%, the content of Co is 16 wt.%, the content of Fe is 2.5 wt.%, the content of Mg is 0.2 wt.%, the content of S is 0.4 wt.%, and the particle size is ≤ 0.15 mm; the method comprises the following steps:

[0140] Step S1, mix 100 g of copper-cobalt sulfide ore with 250 g of cobalt oxide ore for ore blending to obtain a mixed ore material;

[0141] Step S2, mix the mixed ore material with 60 g of a sulfur-fixing agent (sodium carbonate) (the weight ratio of copper-cobalt sulfide ore to the sulfur-fixing agent is 1: 0.6), and then carry out roasting (temperature is 600 °C, time is 1 h) to obtain roasted ore;

[0142] Step S3, mix the roasted ore with water and sulfuric acid (the acid-ore ratio is 250 kg / t, the liquid-solid ratio is 3:1), and then carry out oxygen pressure leaching under stirring (the stirring speed is 800 r / min, the oxygen partial pressure is 1.0 MPa; the temperature of oxygen pressure leaching is 240 °C, time is 1 h) to obtain leaching materials;

[0143] Step S4, carry out solid-liquid separation on the leaching materials to obtain a copper-cobalt leaching solution and leaching residues.

[0144] Examples 17 to 20

[0145] The differences from Example 1 are that the weight percentage of S in the mixed ore material and the roasting temperature are different, as shown in Table 1 in detail.

[0146] Examples 21 to 24

[0147] The differences from Example 1 are that the weight ratio of S in the copper-cobalt sulfide ore to Co in the cobalt oxide ore in the mixed ore material and the oxygen partial pressure of oxygen pressure leaching are different, as shown in Table 1 in detail.

[0148] Comparative Example 1

[0149] The difference from Example 1 is that in Step S1, 100 g of copper-cobalt sulfide ore is mixed with 400 g of cobalt oxide ore (weight ratio is 1:4) for ore blending to obtain a mixed ore material.

[0150] Comparative Example 2

[0151] The difference from Example 1 is as follows: In step S1, 100 g of copper cobalt sulfide ore is mixed with 100 g of cobalt oxide ore (weight ratio is 1:1) for ore blending to obtain a mixed ore material.

[0152] Comparative Example 3

[0153] The difference from Example 1 is as follows: In step S2, the mixed ore material is roasted (temperature is 500 °C, time is 2 h) to obtain roasted ore.

[0154] Comparative Example 4

[0155] The difference from Example 1 is as follows: In step S2, the mixed ore material is mixed with 40 g of sulfur-fixing agent (sodium carbonate) (weight ratio of copper cobalt sulfide ore to sulfur-fixing agent is 1:0.4), and then roasted (temperature is 300 °C, time is 2 h) to obtain roasted ore.

[0156] Comparative Example 5

[0157] The difference from Example 1 is as follows: In step S2, the mixed ore material is mixed with 40 g of sulfur-fixing agent (sodium carbonate) (weight ratio of copper cobalt sulfide ore to sulfur-fixing agent is 1:0.4), and then roasted (temperature is 500 °C, time is 0.5 h) to obtain roasted ore.

[0158] Comparative Example 6

[0159] The difference from Example 1 is as follows: In step S3, the roasted ore is mixed with water and sulfuric acid (acid-ore ratio is 120 kg / t, liquid-solid ratio is 5:1), and then oxygen pressure leaching is carried out under stirring (stirring speed is 800 r / min, oxygen partial pressure is 0.4 MPa; temperature of oxygen pressure leaching is 200 °C, time is 2 h) to obtain leaching materials.

[0160] Comparative Example 7

[0161] The difference from Example 1 is as follows: In step S3, the roasted ore is mixed with water and sulfuric acid (acid-ore ratio is 200 kg / t, liquid-solid ratio is 2:1), and then oxygen pressure leaching is carried out under stirring (stirring speed is 800 r / min, oxygen partial pressure is 0.4 MPa; temperature of oxygen pressure leaching is 200 °C, time is 2 h) to obtain leaching materials.

[0162] Comparative Example 8

[0163] The difference from Example 1 is as follows: In step S3, the roasted ore is mixed with water and sulfuric acid (acid-ore ratio is 200 kg / t, liquid-solid ratio is 5:1), and then oxygen pressure leaching is carried out under stirring (stirring speed is 800 r / min, oxygen partial pressure is 0.2 MPa; temperature of oxygen pressure leaching is 150 °C, time is 2 h) to obtain leaching materials.

[0164] Comparative Example 9

[0165] The difference from Example 1 is as follows: In step S3, roasted ore is mixed with water and sulfuric acid (the acid-ore ratio is 200 kg / t, and the liquid-solid ratio is 5:1), and then oxidative pressure leaching is carried out under stirring (the stirring speed is 600 r / min, and the partial oxygen pressure is 0.4 MPa; the temperature of oxidative pressure leaching is 200 °C, and the time is 0.5 h) to obtain leaching materials.

[0166] Comparative Example 10

[0167] The difference from Example 1 is that the mineral raw material only includes copper-cobalt sulfide ore.

[0168] Comparative Example 11

[0169] The difference from Example 1 is that the mineral raw material only includes cobalt oxide ore.

[0170] Comparative Example 12

[0171] The difference from Example 1 is that atmospheric pressure leaching is adopted in step S3.

[0172] Result test:

[0173] The roasting desulfurization rates of the above-mentioned examples and comparative examples were measured respectively; and the copper-cobalt leaching solutions in the above-mentioned examples and comparative examples were measured to obtain the total copper leaching rate, total cobalt leaching rate, and total iron leaching rate of copper-cobalt sulfide ore and cobalt oxide ore; the results are shown in Table 2.

[0174] Roasting desulfurization rate: The sulfur content in the mixed ore and roasted ore was measured using X-ray fluorescence spectrometry (other chemical analysis methods such as combustion method and titration method can also be used), and the roasting desulfurization rate = (sulfur content in the mixed ore - sulfur content in the roasted ore) ÷ sulfur content in the mixed ore.

[0175] Total copper leaching rate, total cobalt leaching rate, total iron leaching rate: The corresponding metal content in the mixed ore was measured using atomic absorption spectrometry (other chemical analysis methods such as inductively coupled plasma mass spectrometry and X-ray fluorescence spectrometry can also be used), and the metal leaching rate = metal content in the leaching solution ÷ metal content in the mixed ore, or the metal leaching rate = (metal content in the mixed ore - metal content in the leaching residue) ÷ metal content in the mixed ore.

[0176] Table 1

[0177]

[0178] Note: " / " in the above table refers to the same as Example 1.

[0179] Table 2

[0180]

[0181]

[0182] It should be noted that in Comparative Example 7, the acid-to-ore ratio was increased, which could promote leaching. However, the leaching rates of copper and cobalt did not increase significantly. Instead, the acid consumption increased, resulting in increased costs and no benefits.

[0183] As can be seen from the above, compared with the comparative examples, in each embodiment of the present invention, roasting is combined with oxygen pressure leaching for the combined treatment of copper-cobalt sulfide ore and cobalt oxide ore. Through roasting, the sulfides in the copper-cobalt sulfide ore are converted into soluble sulfates, and the low-valent sulfides thermally decomposed can reduce the high-valent cobalt in the cobalt oxide ore to low-valent cobalt that is easily soluble in acidic solutions, which can reduce the consumption of solid sulfur reducing agents in the leaching process of treating cobalt oxide ore alone, thereby significantly reducing the treatment costs of copper-cobalt sulfide ore and cobalt oxide ore; since the sulfides are used in the cobalt reduction process, sulfur dioxide is hardly generated during the roasting process, thus significantly reducing the environmental pollution during the mineral treatment process. At the same time, by adopting the oxygen pressure leaching process, the remaining sulfur in the roasted ore enters the slag or solution in the form of sulfate radicals. And because the copper-cobalt sulfide ore and cobalt oxide ore have been subjected to combined roasting treatment in the previous step, the sulfate radical balance is good during the oxygen pressure leaching process, and no obvious excess sulfuric acid is generated, which can significantly improve the leaching rates of copper and cobalt and reduce the losses of copper and cobalt in the mineral raw materials. The method of the present invention is a method for the combined treatment of copper-cobalt sulfide ore and cobalt oxide ore with low production costs, low environmental pollution, and high leaching rates of copper and cobalt, and the product has high added value and broad application prospects.

[0184] In addition, it can be seen that when all process parameters are within the preferred range of the present invention, the comprehensive effect is better.

[0185] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for the combined treatment of copper-cobalt sulfide ore and cobalt oxide ore, characterized in that: The following steps are involved: Step S1, mixing the copper-cobalt sulfide ore and the cobalt oxide ore to perform ore blending to obtain a mixed ore material; Step S2, mixing the mixed ore with a sulfur-fixing agent, and then roasting to obtain roasted sand; Step S3, mixing the roasted sand with water and sulfuric acid, and then performing oxygen pressure leaching to obtain a leached material; Step S4, performing solid-liquid separation on the leached material to obtain copper-cobalt leaching solution and leaching residue; The weight ratio of the copper-cobalt sulfide ore to the cobalt oxide ore is 1:(1.5-3); The calcination temperature is greater than the oxygen pressure leaching temperature, and the temperature difference is 150-400°C.

2. The method for combined treatment of copper-cobalt sulfide ore and cobalt oxide ore according to claim 1, characterized in that: In terms of weight percentage, the copper-cobalt sulfide ore has a Cu content of 15-25wt.%, a Co content of 8-15wt.%, a Fe content of 6-15wt.%, a Mg content of 2-5.5wt.%, and a S content of 15-21wt.%; and / or a particle size of the copper-cobalt sulfide ore of ≤0.15mm; and / or In terms of weight percentage, the cobalt oxide ore has a Cu content of 0.5-2.5wt.%, a Co content of 8-16wt.%, a Fe content of 0.5-2.5wt.%, a Mg content of 0.2-1.3wt.%, and a S content of 0-0.4wt.%; and / or a particle size of the cobalt oxide ore of ≤0.15mm.

3. The method for combined treatment of copper-cobalt sulfide ore and cobalt oxide ore according to claim 1 or 2, characterized in that: The weight ratio of Co in the copper-cobalt sulfide ore to Co in the cobalt oxide ore is 1:(1.5-4); and / or The weight ratio of S in the copper-cobalt sulfide ore to Co in the cobalt oxide ore is 1:(0.02-0.06).

4. The method for combined treatment of copper-cobalt sulfide ore and cobalt oxide ore according to claim 1 or 2, characterized in that: The sulfur-fixing agent includes one or more of sodium carbonate, sodium sulfate and sodium chloride; and / or The weight ratio of the copper-cobalt sulfide ore to the sulfur-fixing agent is 1:(0.2-0.6).

5. The method for combined treatment of copper-cobalt sulfide ore and cobalt oxide ore according to claim 1 or 2, characterized in that: The calcination temperature is 350-600° C. and the calcination time is 1-4 hours.

6. The method for combined treatment of copper-cobalt sulfide ore and cobalt oxide ore according to claim 1 or 2, characterized in that: The acid-ore ratio of the oxygen pressure leaching is 150-250 kg / t, and the liquid-solid ratio is (3-8):

1.

7. The method for combined treatment of copper-cobalt sulfide ore and cobalt oxide ore according to claim 1 or 2, characterized in that: The oxygen partial pressure of the oxygen pressure leaching is 0.2-1.0 MPa; and / or The temperature of the oxygen pressure leaching is 180-240° C., and the time is 1-4 hours.

8. The method for combined treatment of copper-cobalt sulfide ore and cobalt oxide ore according to claim 1 or 2, characterized in that: When the weight percentage of S in the mixed ore is 4.0-5.5wt.%, the calcination temperature is 350-450°C; When the weight percentage of S in the mixed ore is greater than 5.5 wt.%, and less than or equal to 8.5 wt.%, the roasting temperature is greater than 450°C and less than or equal to 600°C.

9. The method for combined treatment of copper-cobalt sulfide ore and cobalt oxide ore according to claim 1 or 2, characterized in that: When the weight ratio of S in the copper-cobalt sulfide ore to Co in the cobalt oxide ore is 1:(0.02-0.04), the oxygen partial pressure of the oxygen pressure leaching is 0.2-0.5 MPa; When the weight ratio of S in the copper-cobalt sulfide ore to Co in the cobalt oxide ore is less than 1:0.04 and greater than or equal to 1:0.06, the oxygen partial pressure of the oxygen pressure leaching is greater than 0.5 MPa and less than or equal to 1 MPa.

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