Method for leaching copper-cobalt sulfide ores under efficient oxygen pressure

Abstract

The invention provides a method for leaching copper-cobalt sulfide ore under efficient oxygen pressure, and relates to the technical field of metallurgy. The method for efficiently leaching the copper-cobalt sulfide ores under the oxygen pressure comprises the following steps: mixing materials including the copper-cobalt sulfide ores, sulfuric acid and water, slurrying, and then carrying out an oxygen pressure leaching reaction; and after the oxygen pressure leaching reaction is finished, solid-liquid separation is carried out, and leaching residues and leaching liquid are obtained. According to the method, the self-exothermic reaction of the excess sulfur element in the copper-cobalt sulfide ore is utilized, additional heating is not needed in the reaction process, then the oxygen pressure leaching reaction can be rapidly completed at a high temperature in a short time, and SO2 is not generated in the reaction process. The method for high-efficiency oxygen pressure leaching of the copper-cobalt sulfide ore has the advantages of being high in reaction speed, low in reaction energy consumption, easy to operate, environmentally friendly, easy to achieve industrial application and the like.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, and in particular to a method for efficiently oxygen pressure leaching copper-cobalt sulfide ore. Background Art

[0002] Cobalt is an important metal element with broad application prospects, and the global demand for cobalt will continue to grow in the future. However, copper is usually associated with cobalt in natural ores and exists in copper-cobalt oxide ores or copper-cobalt sulfide ores. For copper-cobalt sulfide ores, the commonly used smelting methods in the metallurgical field usually include pyrometallurgical processes, sulfuric acid roasting-leaching processes, and oxygen pressure leaching processes. However, the cost of treating wastewater and waste gas in pyrometallurgical processes is high, and it is difficult to meet increasingly stringent environmental protection requirements. The sulfuric acid roasting-leaching process usually has a high temperature and high energy consumption. The oxygen pressure leaching process has a high metal recovery rate and is clean and efficient, so it has been widely studied.

[0003] Pressure leaching is a green and efficient enhanced metallurgical process, which refers to the leaching of minerals under high temperature and high pressure. Oxygen pressure leaching further creates an oxygen-rich environment, oxidizing the sulfur in the mineral into sulfate ions to leach valuable elements. Copper, cobalt and other elements in the mineral enter the leachate, and copper and cobalt can be recovered separately through further electrolytic extraction; while iron can be hydrolyzed under high temperature and high pressure and enter the slag, and the iron can be removed through simple liquid-solid separation. Oxygen pressure leaching of copper-cobalt sulfide ore has the advantages of high metal recovery rate, no SO2 emissions, green environmental protection, and simple process.

[0004] In the existing technology of oxygen pressure leaching of copper-cobalt sulfide ore, the leaching temperature is lower than 200°C, and the leaching time mostly takes 2-3 hours. Due to the special properties of copper-cobalt sulfide ore, the sulfur element itself releases a lot of heat during the reaction process, and the lower reaction temperature often leads to an extension of the reaction time, and additional circulating water cooling is required, which makes the reaction efficiency low and the cost relatively high. In addition, some also need to grind the particles to an extremely low fineness, which will also lead to an increase in cost. Therefore, how to choose the appropriate leaching temperature to achieve efficient oxygen pressure leaching of copper-cobalt ore to recover copper and cobalt and reduce costs, improve quality, and increase efficiency has important industrial significance and has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The purpose of this application is to provide a method for efficiently oxygen pressure leaching copper-cobalt sulfide ore to solve the above problems.

[0006] To achieve the above objectives, this application adopts the following technical solutions: The present application provides a method for efficiently oxygen pressure leaching copper-cobalt sulfide ore, comprising: Mixing materials including copper-cobalt sulfide ore, sulfuric acid, and water, slurrying, and then performing oxygen pressure leaching reaction; After the oxygen pressure leaching reaction is completed, solid-liquid separation is performed to obtain leaching residue and leaching liquid.

[0007] Preferably, the sulfur content in the copper-cobalt sulfide ore is not less than 10%.

[0008] Preferably, the copper-cobalt sulfide ore comprises, by mass percentage, 10-35% copper, 2-15% cobalt, 0.5-25% iron, etc.

[0009] Preferably, no less than 75% of the copper-cobalt sulfide ore has a particle size of less than or equal to 74 μm.

[0010] Preferably, the liquid-to-solid ratio of the mixed material is 4-6.

[0011] Preferably, the acid-ore ratio of the mixed material is 0-300 kg / ton of the copper-cobalt sulfide ore.

[0012] Preferably, the pressure of the oxygen pressure leaching reaction is 0.3-0.6 MPa.

[0013] Preferably, the temperature of the oxygen pressure leaching reaction is 200-230° C., and the time of the oxygen pressure leaching reaction is 20-60 min.

[0014] Preferably, the leaching solution includes copper ions and cobalt ions, and other ions are present in the leaching residue.

[0015] Compared with the prior art, the beneficial effects of this application include: The present application utilizes the high sulfur content of the copper-cobalt sulfide ore, which reacts only through the self-exothermic reaction of sulfur during the oxygen pressure leaching reaction. No additional heating is required during the reaction, thereby being able to generate a higher temperature in a short time to quickly complete the oxygen pressure leaching reaction.

[0016] And in the reaction process, on the one hand, because the sulfur element with a high content of copper-cobalt sulfide ore itself is consumed in the process of self-heat release, the sulfur element has the characteristics of rapid heat release in the process of being oxidized, and thus can reduce the consumption of energy in the oxygen pressure leaching reaction; on the other hand, because the self-heat release of sulfur element provides a heat source for the reaction, it plays a role of thermal activation in the reaction, and changes the mineral structure in the copper-cobalt sulfide ore at a higher temperature, so that the copper-cobalt sulfide ore is more likely to react with sulfuric acid, making the subsequent leaching process of copper and cobalt more efficient. Ultimately, the leaching rate of copper and cobalt is greatly improved, and the low-valent sulfur in the copper-cobalt sulfide ore will be oxidized to the form of high-valent sulfur of acid radical ions during the reaction, so that SO2 will not be produced during the reaction, which is green and environmentally friendly. Therefore, the present application has the advantages of fast reaction speed, low reaction energy consumption, simple operation, environmental friendliness, and easy to realize industrial application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope of the present application.

[0018] Figure 1 A schematic diagram of the process flow of efficient oxygen pressure leaching of copper-cobalt sulfide ore provided in an embodiment. DETAILED DESCRIPTION

[0019] As used herein: "Prepared from" is synonymous with "comprising." As used herein, the terms "comprising," "including," "having," "containing," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0020] The conjunction "consisting of excludes any unspecified element, step, or component. If used in a claim, this phrase renders the claim closed-ended so that it does not include materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of" appears in a clause of the body of a claim rather than immediately following the subject matter, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0021] When an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including ranges "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described in this article, unless otherwise stated, the range is intended to include its end values ​​and all integers and fractions within the range.

[0022] In these examples, parts and percentages are by mass unless otherwise indicated.

[0023] "Mass parts" refers to the basic unit of measurement for expressing the mass ratio of multiple components. 1 part can represent any unit mass, such as 1g or 2.689g. If we say that the mass parts of component A are a parts and the mass parts of component B are b parts, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it means that the mass of component A is aK and the mass of component B is bK (K is an arbitrary number, indicating a multiple factor). It should not be misunderstood that, unlike the mass parts, the sum of the mass parts of all components is not limited to 100 parts.

[0024] "And / or" is used to indicate that one or both of the stated situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0025] In order to better explain the technical solution provided by this application, before the embodiments, the technical solution is first described as a whole, as follows: The present application provides a method for efficiently oxygen pressure leaching copper-cobalt sulfide ore, comprising: Mixing materials including copper-cobalt sulfide ore, sulfuric acid, and water, slurrying, and then performing oxygen pressure leaching reaction; After the oxygen pressure leaching reaction is completed, solid-liquid separation is performed to obtain leaching residue and leaching liquid.

[0026] In an optional embodiment, the sulfur content in the copper-cobalt sulfide ore is not less than 10%. Sulfur is an important component element in copper-cobalt sulfide ore. A higher sulfur content can further increase the reaction temperature and shorten the reaction time in the oxygen pressure leaching reaction.

[0027] In an optional embodiment, the copper-cobalt sulfide ore includes 10-35% copper, 2-15% cobalt, 0.5-25% iron, etc., calculated by mass percentage.

[0028] Optionally, in the copper-cobalt sulfide ore, calculated as a percentage by mass, the copper content in the copper-cobalt sulfide ore may be 10%, 15%, 20%, 25%, 30%, 35%, or any value between 10-35%; the cobalt content may be 2%, 4%, 6%, 8%, 10%, 12%, 14%, 15%, or any value between 2-15%; the iron content may be 0.5%, 5%, 10%, 15%, 20%, 25%, or any value between 0.5-25%.

[0029] In an optional embodiment, no less than 75% of the copper-cobalt sulfide ore has a particle size of less than or equal to 74 μm. In this way, on the one hand, sufficient contact between the copper-cobalt sulfide ore particles and sulfuric acid can be ensured, thereby improving the leaching rate of copper and cobalt; on the other hand, the copper-cobalt sulfide ore with this particle size can reduce the energy consumption in the leaching process. If the particle size is too high, the leaching time needs to be extended, that is, higher energy consumption is required, and if the particle size is too small, the energy consumption of stirring and transportation needs to be increased.

[0030] Optionally, the proportion of the copper-cobalt sulfide ore with a particle size of less than or equal to 74 μm may be 75%, 80%, 85%, 90%, 95%, 100%, or any value between 75% and 100%; the particle size of more than 75% of the copper-cobalt sulfide ore may be 1 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 74 μm, or any value between 1 and 74 μm.

[0031] In an optional embodiment, the liquid-to-solid ratio of the mixed material is 4-6.

[0032] Optionally, the liquid-to-solid ratio of the mixed material can be 4, 5, 6, or any value between 4 and 6.

[0033] In an optional embodiment, the acid-ore ratio of the mixed material is 0-300 kg / ton of the copper-cobalt sulfide ore. The acid-ore ratio will affect the extraction rate of copper and cobalt. As the acid-ore ratio increases, the copper and cobalt in the copper-cobalt sulfide ore can react more fully with the acid, and the extraction rate will gradually increase. However, when the acid-ore ratio is too high, side reactions will occur, thereby affecting the extraction rate.

[0034] Optionally, the acid-ore ratio of the mixed material can be 50 kg / ton of the copper-cobalt sulfide ore, 100 kg / ton of the copper-cobalt sulfide ore, 150 kg / ton of the copper-cobalt sulfide ore, 200 kg / ton of the copper-cobalt sulfide ore, 250 kg / ton of the copper-cobalt sulfide ore, 300 kg / ton of the copper-cobalt sulfide ore, or any value between 0 and 300 kg / ton of the copper-cobalt sulfide ore.

[0035] In an optional embodiment, the oxygen pressure leaching reaction uses pure oxygen, which can be industrial pure oxygen, with a pressure of 0.3~0.6MPa. When the sulfur content in the copper-cobalt sulfide ore is greater than or equal to 10%, the pressure of the oxygen pressure leaching reaction is 0.4~0.6MPa; when the sulfur content in the copper-cobalt sulfide ore is less than 10%, the pressure of the oxygen pressure leaching reaction is 0.3~0.5MPa. By controlling the pure oxygen pressure, the temperature, pressure, acidity and other conditions in the reaction can be optimized, thereby maintaining the heat balance in the reaction system and reducing energy consumption. At the same time, the acid produced also provides favorable conditions for the subsequent recovery of copper and cobalt.

[0036] Optionally, the pressure of the oxygen pressure leaching reaction may be 0.3 MPa, 0.4 MPa, 0.5 MPa, 0.5 MPa, 0.6 MPa, or any value between 0.3 and 0.6 MPa.

[0037] In an optional embodiment, the temperature of the oxygen pressure leaching reaction is 200-230° C., and the time of the oxygen pressure leaching reaction is 20-60 min. The reaction temperature and time are important factors affecting the reaction rate. In the process of oxygen pressure leaching of copper-cobalt sulfide ore, appropriate temperature and time can increase the reaction rate, so that the copper and cobalt in the ore react more fully with sulfuric acid, thereby increasing the leaching rate.

[0038] Optionally, the temperature of the oxygen pressure leaching reaction can be 200°C, 205°C, 210°C, 215°C, 220°C, 225°C, 230°C, or any value between 200 and 230°C.

[0039] In an optional embodiment, the leachate includes copper ions and cobalt ions, and other ions are present in the leaching residue.

[0040] In the above oxygen pressure leaching reaction, the main reaction of the copper-cobalt sulfide ore is: 4CuFeS2+ 2H2SO4+ 17O2=4CuSO4+ 2Fe2(SO4)3+ 2H2O; Cu2S + 5O2+ 2H2SO4=4CuSO4+ 2H2O; CoS + 2O2 = CoSO4; 4FeS2+ 2H2O + 15O2= 2H2SO4+2Fe2(SO4)3; 2Fe2(SO4)3+ 3H2O=Fe2O3+3H2SO4; Among them, the iron ions in the copper-cobalt sulfide ore are hydrolyzed to form Fe2O3 and enter the leaching slag.

[0041] The embodiments of the present application will be described in detail in conjunction with specific examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present application and should not be considered as limiting the scope of the present application. If specific conditions are not specified in the examples, they are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0042] The copper-cobalt sulfide ore used in the embodiment is a foreign copper-cobalt sulfide ore, and its main element analysis is shown in Table 1: Table 1 Main element composition of a foreign copper-cobalt sulfide ore

[0043] Example 1 like Figure 1 As shown, this embodiment provides a method for high-efficiency oxygen pressure leaching of copper-cobalt sulfide ore, and the specific process is as follows: The oxygen pressure leaching reaction uses industrial pure oxygen, the oxygen pressure during the reaction is 0.6MPa, more than 75% of the particle size of the copper-cobalt sulfide ore used is less than 74μm, the liquid-solid ratio is 6, the acid-ore ratio is 180kg / ton of copper-cobalt sulfide ore, the reaction temperature is 230℃, and the reaction time is 1h.

[0044] The copper-cobalt sulfide ore, sulfuric acid and water are mixed and slurried, and then placed in an autoclave. After the autoclave is sealed, industrial pure oxygen is introduced and oxygen pressure leaching reaction is carried out. After the reactor is cooled down, the slurry is taken out, and the leachate and leaching slag are obtained after solid-liquid separation. The leaching rates of copper and cobalt slag are 99.65% and 99.80% respectively. The leachate contains 33.96g / L copper, 19.20g / L cobalt and 0.45g / L iron, which can be used as a raw material for direct electrowinning.

[0045] Example 2 This embodiment provides a method for high-efficiency oxygen pressure leaching of copper-cobalt sulfide ore, and the specific process is as follows: The oxygen pressure leaching reaction uses industrial pure oxygen, the oxygen pressure during the reaction is 0.4MPa, more than 75% of the particle size of the copper-cobalt sulfide ore used is less than 74μm, the liquid-solid ratio is 6, the acid-ore ratio is 180kg / ton of copper-cobalt sulfide ore, the reaction temperature is 210℃, and the reaction time is 1h.

[0046] The copper-cobalt sulfide ore, sulfuric acid and water are mixed and slurried, and then placed in an autoclave. After the autoclave is sealed, industrial pure oxygen is introduced and oxygen pressure leaching reaction is carried out. After the reactor is cooled down, the slurry is taken out, and the leachate and leaching slag are obtained after solid-liquid separation. The leaching rates of copper and cobalt slag are 99.40% and 99.75% respectively. The leachate contains 35.74g / L copper, 19.78g / L cobalt and 0.23g / L iron, which can be used as a raw material for direct electrowinning.

[0047] Example 3 This embodiment provides a method for high-efficiency oxygen pressure leaching of copper-cobalt sulfide ore, and the specific process is as follows: The oxygen pressure leaching reaction uses industrial pure oxygen, the oxygen pressure during the reaction is 0.6MPa, more than 75% of the particle size of the copper-cobalt sulfide ore used is less than 74μm, the liquid-solid ratio is 6, the acid-ore ratio is 180kg / ton of copper-cobalt sulfide ore, the reaction temperature is 230℃, and the reaction time is 0.5h.

[0048] The copper-cobalt sulfide ore, sulfuric acid and water are mixed and slurried, and then placed in an autoclave. The autoclave is sealed and industrial pure oxygen is introduced to perform oxygen pressure leaching reaction. After the reactor cools down, the slurry is taken out, and the leaching liquid and leaching slag are obtained after solid-liquid separation. The leaching rates of copper and cobalt slag are 99.11% and 99.67% respectively.

[0049] Example 4 This embodiment provides a method for high-efficiency oxygen pressure leaching of copper-cobalt sulfide ore, and the specific process is as follows: The oxygen pressure leaching reaction uses industrial pure oxygen, the oxygen pressure during the reaction is 0.6MPa, more than 75% of the particle size of the copper-cobalt sulfide ore used is less than 74μm, the liquid-solid ratio is 4, the acid-ore ratio is 0kg / ton of copper-cobalt sulfide ore, the reaction temperature is 230℃, and the reaction time is 1h.

[0050] The copper-cobalt sulfide ore, sulfuric acid and water are mixed and slurried and placed in an autoclave. After the autoclave is sealed, industrial pure oxygen is introduced and oxygen pressure leaching reaction is carried out. After the reactor is cooled down, the slurry is taken out, and the leachate and leaching slag are obtained after solid-liquid separation. The leaching rates of copper and cobalt slag are 99.40% and 99.75% respectively. The leachate contains 49.42g / L copper, 26.40g / L cobalt and 2.26g / L iron, which can be used as a raw material for direct electrowinning.

[0051] Example 5 This embodiment provides a method for high-efficiency oxygen pressure leaching of copper-cobalt sulfide ore, and the specific process is as follows: The oxygen pressure leaching reaction uses industrial pure oxygen, the oxygen pressure during the reaction is 0.6MPa, more than 75% of the particle size of the copper-cobalt sulfide ore used is less than 74μm, the liquid-solid ratio is 4, the acid-ore ratio is 300kg / ton of copper-cobalt sulfide ore, the reaction temperature is 230℃, and the reaction time is 1h.

[0052] The copper-cobalt sulfide ore, sulfuric acid and water are mixed and slurried and placed in an autoclave. After the autoclave is sealed, industrial pure oxygen is introduced and oxygen pressure leaching reaction is carried out. After the reactor is cooled down, the slurry is taken out, and the leachate and leaching slag are obtained after solid-liquid separation. The leaching rates of copper and cobalt slag are 99.43% and 99.86% respectively. The leachate contains 48.76g / L copper, 25.44g / L cobalt and 2.03g / L iron, which can be used as a raw material for direct electrowinning.

[0053] Example 6 This embodiment provides a method for high-efficiency oxygen pressure leaching of copper-cobalt sulfide ore, and the specific process is as follows: The oxygen pressure leaching reaction uses industrial pure oxygen, the oxygen pressure during the reaction is 0.6MPa, more than 75% of the particle size of the copper-cobalt sulfide ore used is less than 74μm, the liquid-solid ratio is 6, the acid-ore ratio is 180kg / ton of copper-cobalt sulfide ore, the reaction temperature is 230℃, and the reaction time is 20min.

[0054] The copper-cobalt sulfide ore, sulfuric acid and water are mixed and slurried, and then placed in an autoclave. After the autoclave is sealed, industrial pure oxygen is introduced and oxygen pressure leaching reaction is carried out. After the reactor is cooled down, the slurry is taken out, and the leachate and leach slag are obtained after solid-liquid separation. The leaching rates of copper and cobalt slag are 99.01% and 99.12% respectively. The leachate contains 32.85g / L copper, 18.94g / L cobalt and 0.35g / L iron.

[0055] Example 7 This embodiment provides a method for high-efficiency oxygen pressure leaching of copper-cobalt sulfide ore, and the specific process is as follows: The oxygen pressure leaching reaction uses industrial pure oxygen, the oxygen pressure during the reaction is 0.6MPa, more than 75% of the particle size of the copper-cobalt sulfide ore used is less than 74μm, the liquid-solid ratio is 6, the acid-ore ratio is 180kg / ton of copper-cobalt sulfide ore, the reaction temperature is 230℃, and the reaction time is 40min.

[0056] The copper-cobalt sulfide ore, sulfuric acid and water are mixed and slurried, and then placed in an autoclave. After the autoclave is sealed, industrial pure oxygen is introduced to carry out oxygen pressure leaching reaction. After the reactor cools down, the slurry is taken out, and the leachate and leaching slag are obtained after solid-liquid separation. The leaching rates of copper and cobalt slag are 99.34% and 99.29% respectively. The leachate contains 32.99g / L copper, 19.03g / L cobalt and 0.40g / L iron.

[0057] Comparative Example 1 This comparative example provides a method for efficiently oxygen pressure leaching copper-cobalt sulfide ore, and the specific process is as follows: For the copper-cobalt sulfide ore, industrial pure oxygen was used, the oxygen pressure during the reaction was 0.4 MPa, more than 75% of the copper-cobalt sulfide ore had a particle size less than 74 μm, the reaction temperature was 160°C, the reaction time was 2 hours, the liquid-solid ratio was 6, and the acid-ore ratio was 180 kg / ton of copper-cobalt sulfide ore. The leaching rates of copper and cobalt slag were 98.35% and 99.73% respectively.

[0058] Comparative Example 2 This comparative example provides a method for efficiently oxygen pressure leaching copper-cobalt sulfide ore, and the specific process is as follows: For the copper-cobalt sulfide ore, industrial pure oxygen was used, the oxygen pressure during the reaction was 0.4 MPa, more than 75% of the particle size of the copper-cobalt sulfide ore used was less than 74 μm, the reaction temperature was 180°C, the reaction time was 2 hours, the liquid-solid ratio was 6, and the acid-ore ratio was 180 kg / ton of copper-cobalt sulfide ore. The leaching rates of copper and cobalt slag were 99.35% and 99.84% respectively.

[0059] Comparative Example 3 This comparative example provides a method for efficiently oxygen pressure leaching copper-cobalt sulfide ore, and the specific process is as follows: For the copper-cobalt sulfide ore, industrial pure oxygen was used, the oxygen pressure during the reaction was 0.4 MPa, more than 75% of the particle size of the copper-cobalt sulfide ore was less than 74 μm, the reaction temperature was 190°C, the reaction time was 2 hours, the liquid-solid ratio was 6, and the acid-ore ratio was 180 kg / ton of copper-cobalt sulfide ore. The leaching rates of copper and cobalt slag were 99.43% and 99.69% respectively.

[0060] Comparative Example 4 This comparative example provides a method for efficiently oxygen pressure leaching copper-cobalt sulfide ore, and the specific process is as follows: For the copper-cobalt sulfide ore, industrial pure oxygen was used, the oxygen pressure during the reaction was 0.4 MPa, more than 75% of the copper-cobalt sulfide ore had a particle size less than 74 μm, the reaction temperature was 180°C, the reaction time was 0.5 h, the liquid-solid ratio was 6, and the acid-ore ratio was 120 kg / ton of copper-cobalt sulfide ore. The leaching rates of copper and cobalt slag were 89.72% and 88.31% respectively.

[0061] Comparative Example 5 This comparative example provides a method for efficiently oxygen pressure leaching copper-cobalt sulfide ore, and the specific process is as follows: For the copper-cobalt sulfide ore, industrial pure oxygen was used, the oxygen pressure during the reaction was 0.4 MPa, more than 75% of the copper-cobalt sulfide ore had a particle size less than 74 μm, the reaction temperature was 180°C, the reaction time was 0.75 h, the liquid-solid ratio was 6, and the acid-ore ratio was 120 kg / ton of copper-cobalt sulfide ore. The leaching rates of copper and cobalt slag were 89.72% and 88.31% respectively.

[0062] Comparative Example 6 This comparative example provides a method for efficiently oxygen pressure leaching copper-cobalt sulfide ore, and the specific process is as follows: For the copper-cobalt sulfide ore, industrial pure oxygen was used, the oxygen pressure during the reaction was 0.4 MPa, more than 75% of the particle size of the copper-cobalt sulfide ore was less than 74 μm, the reaction temperature was 180°C, the reaction time was 0.5 h, the liquid-solid ratio was 6, and the acid-ore ratio was 180 kg / ton of copper-cobalt sulfide ore. The leaching rates of copper and cobalt slag were 89.45% and 88.90% respectively.

[0063] Comparative Example 7 This comparative example provides a method for efficiently oxygen pressure leaching copper-cobalt sulfide ore, and the specific process is as follows: For the copper-cobalt sulfide ore, industrial pure oxygen was used, the oxygen pressure during the reaction was 0.4 MPa, more than 75% of the particle size of the copper-cobalt sulfide ore was less than 74 μm, the reaction temperature was 180°C, the reaction time was 0.75 h, the liquid-solid ratio was 6, and the acid-ore ratio was 180 kg / ton of copper-cobalt sulfide ore. The leaching rates of copper and cobalt slag were 90.45% and 90.90% respectively.

[0064] summary According to the above embodiments and comparative examples, it can be seen that: It can be seen from Example 1, Example 4, and Example 5 that the same copper-cobalt sulfide ore is used in the scheme provided in the present application. Under the condition that the particle size, oxygen pressure and reaction time are kept unchanged, the leaching rates of copper and cobalt are both above 99% when the acid-ore ratio is 0-300 kg / ton and the liquid-solid ratio is 4-6; it can be seen from Example 1, Example 6, and Example 7 that when other factors are kept unchanged and only the reaction time of the oxygen pressure leaching reaction is changed, within the range of 20-60 min, the leaching rates of copper and cobalt in the method proposed in the present application can be maintained above 99%.

[0065] It can be seen from Comparative Examples 1, 2 and 3 that by keeping other conditions unchanged, lowering the reaction temperature and prolonging the reaction time, the leaching rates of copper and cobalt can be maintained at more than 99%; it can be seen from Comparative Examples 4 to 7 that if the temperature is lowered and the reaction time is shortened, the leaching rates of copper and cobalt will drop below 90%, because the lower temperature reduces the kinetic speed of the reaction and slows down the leaching rate.

[0066] It can be seen that the method of oxygen pressure entering and exiting copper sulfide provided in the present application has the advantages of fast reaction speed, low reaction energy consumption, simple operation, environmental friendliness and easy industrial application.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0068] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the above claims, any one of the claimed embodiments may be used in any combination. The information disclosed in this background technology section is intended only to deepen the understanding of the overall background technology of the present application and should not be regarded as an admission or in any form of implication that the information constitutes prior art known to those skilled in the art.

Claims

1. A method for efficiently leaching copper-cobalt sulfide ore by oxygen pressure, characterized in that: include: Mixing materials including copper-cobalt sulfide ore, sulfuric acid, and water, slurrying, and then performing oxygen pressure leaching reaction; After the oxygen pressure leaching reaction is completed, solid-liquid separation is performed to obtain leaching residue and leaching liquid.

2. The method for high-efficiency oxygen pressure leaching of copper-cobalt sulfide ore according to claim 1, characterized in that: The sulfur content in the copper-cobalt sulfide ore is not less than 10%.

3. The method for high-efficiency oxygen pressure leaching of copper-cobalt sulfide ore according to claim 2, characterized in that: The copper-cobalt sulfide ore comprises, by mass percentage, 10-35% copper, 2-15% cobalt, and 0.5-25% iron.

4. The method for high-efficiency oxygen pressure leaching of copper-cobalt sulfide ore according to claim 3, characterized in that: No less than 75% of the copper-cobalt sulfide ore has a particle size of less than or equal to 74 μm.

5. The method for high-efficiency oxygen pressure leaching of copper-cobalt sulfide ore according to claim 1, characterized in that: The liquid-to-solid ratio of the material is 4-6.

6. The method for high-efficiency oxygen pressure leaching of copper-cobalt sulfide ore according to claim 5, characterized in that: The acid-ore ratio of the material is 0-300 kg / ton of the copper-cobalt sulfide ore.

7. The method for high-efficiency oxygen pressure leaching of copper-cobalt sulfide ore according to claim 1, characterized in that: The pressure of the oxygen pressure leaching reaction is 0.3-0.6 MPa.

8. The method for high-efficiency oxygen pressure leaching of copper-cobalt sulfide ore according to claim 7, characterized in that: The temperature of the oxygen pressure leaching reaction is 200-230°C.

9. The method for high-efficiency oxygen pressure leaching of copper-cobalt sulfide ore according to claim 8, characterized in that: The oxygen pressure leaching reaction time is 20 to 60 minutes.

10. The method for high-efficiency oxygen pressure leaching of copper-cobalt sulfide ore according to any one of claims 1 to 9, characterized in that: The leaching solution includes copper ions and cobalt ions.

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