阅读说明：本技术 一种湿法锌冶炼镉回收工序产出的含钴溶液的处理方法 (Method for treating cobalt-containing solution produced in wet zinc smelting cadmium recovery process ) 是由 姜艳 邱伟佳 周中华 李国峰 张少博 刘建平 刘自虎 董坤 于 2021-09-09 设计创作，主要内容包括：本发明公开一种湿法锌冶炼镉回收工序产出的含钴溶液的处理方法,其特征在于,包括步骤：向湿法锌冶炼镉回收工序产出的含钴溶液中加入沉钴剂,进行氧化沉钴反应,得到沉钴矿浆；向所述沉钴矿浆中加入含酸溶液,进行酸洗,固液分离后,得到贫钴液和富钴渣。本发明通过氧化沉钴和酸洗相结合,得到贫钴液和富钴渣,贫钴液中钴含量较低,可直接返回净化系统,可避免现有技术中湿法锌冶炼镉回收工序产出的含钴溶液中钴含量较高,直接进入净化系统对过程杂质的平稳控制造成一定的影响,同时造成锌粉单耗的升高的问题。(The invention discloses a method for treating cobalt-containing solution produced in a wet zinc smelting cadmium recovery process, which is characterized by comprising the following steps of: adding a cobalt precipitation agent into a cobalt-containing solution produced in the wet zinc smelting cadmium recovery process, and carrying out oxidation cobalt precipitation reaction to obtain cobalt precipitation ore pulp; and adding an acid-containing solution into the cobalt precipitation ore pulp, carrying out acid washing, and carrying out solid-liquid separation to obtain a cobalt-poor solution and cobalt-rich slag. According to the invention, cobalt precipitation by oxidation and acid washing are combined to obtain the poor cobalt solution and the cobalt-rich slag, the cobalt content in the poor cobalt solution is low, and the poor cobalt solution can be directly returned to a purification system, so that the problems that the cobalt content in the cobalt-containing solution produced in the wet zinc smelting cadmium recovery process in the prior art is high, the cobalt-containing solution directly enters the purification system to cause certain influence on the stable control of process impurities and the unit consumption of zinc powder is increased are solved.)

1. A method for treating a cobalt-containing solution produced in a wet zinc smelting cadmium recovery process is characterized by comprising the following steps:

adding a cobalt precipitation agent into a cobalt-containing solution produced in the wet zinc smelting cadmium recovery process, and carrying out oxidation cobalt precipitation reaction to obtain cobalt precipitation ore pulp;

and adding an acid-containing solution into the cobalt precipitation ore pulp, carrying out acid washing, and carrying out solid-liquid separation to obtain a cobalt-poor solution and cobalt-rich slag.

2. The method according to claim 1, wherein the cobalt-containing solution produced in the wet zinc smelting cadmium recovery process contains zinc ions, cobalt ions, cadmium ions and iron ions.

3. The treatment method according to claim 1, wherein the cobalt precipitation agent is selected from one or more of ammonium persulfate, Carlo acid and beta-naphthol.

4. The treatment method according to claim 1, wherein the mass ratio of the cobalt precipitation agent to the cobalt in the cobalt-containing solution produced in the wet zinc smelting cadmium recovery process is (12-24): 1.

5. the treatment method according to claim 1, wherein the conditions of the cobalt oxide precipitation reaction are as follows: the pH value of the system is 2.0-3.0, the temperature is 60-80 ℃, and the time is 0.5-2 h.

6. The treatment method according to claim 1, wherein the acid-containing solution is one or two selected from a sulfuric acid solution and an electrolytic waste liquid in a wet zinc smelting system.

7. The treatment process according to claim 1, characterized in that the pickling conditions are: the pH value of the system is 2.0-3.0, the temperature is 60-80 ℃, and the time is 0.5-1 h.

8. The process according to claim 1, wherein the cobalt content of the cobalt-rich slag is greater than 5% by mass.

9. The treatment method according to any one of claims 1 to 8, wherein the step of adding a cobalt precipitation agent into the cobalt-containing solution produced in the wet zinc smelting cadmium recovery process to perform an oxidation cobalt precipitation reaction to obtain cobalt precipitation ore pulp specifically comprises:

adding a cobalt-containing solution produced in the wet zinc smelting cadmium recovery procedure into a reaction tank;

adding a cobalt precipitation agent into the cobalt-containing solution produced in the wet zinc smelting cadmium recovery procedure in the reaction tank, and carrying out oxidation cobalt precipitation reaction to obtain cobalt precipitation ore pulp.

10. The treatment method according to claim 9, wherein the step of adding an acid-containing solution into the cobalt precipitation ore pulp, performing acid washing, and performing solid-liquid separation to obtain a cobalt-poor solution and a cobalt-rich slag comprises the following specific steps:

and adding an acid-containing solution into the cobalt-precipitated ore pulp in the reaction tank, carrying out acid washing, and carrying out solid-liquid separation by filtering to obtain a poor cobalt solution and cobalt-rich slag.

Technical Field

The invention relates to the field of nonferrous metallurgy, in particular to a method for treating a cobalt-containing solution produced in a wet zinc smelting cadmium recovery procedure.

Background

In the zinc hydrometallurgy process, cobalt is a harmful impurity element, a leaching solution can be returned to a system for electrolysis after being purified and cobalt removed, part of cobalt enters a cadmium recovery process along with copper and cadmium residues in the purification and cobalt removal process, and the cobalt enters a solution after the copper and cadmium residues are leached in the cadmium recovery process. In the prior art, a cobalt-containing solution is directly returned to a purification process without treatment, and if the cobalt is not removed, the cobalt returns to the purification process, certain influence is caused on the stable control of process impurities, and the unit consumption of zinc powder is increased; meanwhile, with continuous exploitation of zinc raw ore resources, high-quality zinc resources are gradually reduced, and the increase of cobalt impurities caused by diversification and complication of zinc raw material resources has certain influence on the purification production stability.

Thus, there is still a need for improvement and development of the prior art.

Disclosure of Invention

In view of the defects of the prior art, the invention aims to provide a method for treating a cobalt-containing solution produced in a wet zinc smelting cadmium recovery process, and aims to solve the problem that the cobalt-containing solution produced in the prior wet zinc smelting cadmium recovery process has high cobalt content and is directly returned to a purification system to influence the stability of impurities in the process.

The technical scheme of the invention is as follows:

the invention provides a method for treating cobalt-containing solution produced in a wet zinc smelting cadmium recovery process, which comprises the following steps:

adding a cobalt precipitation agent into a cobalt-containing solution produced in the wet zinc smelting cadmium recovery process, and carrying out oxidation cobalt precipitation reaction to obtain cobalt precipitation ore pulp;

and adding an acid-containing solution into the cobalt precipitation ore pulp, carrying out acid washing, and carrying out solid-liquid separation to obtain a cobalt-poor solution and cobalt-rich slag.

Optionally, the cobalt-containing solution produced in the wet zinc smelting cadmium recovery process contains zinc ions, cobalt ions, cadmium ions and iron ions.

Optionally, the cobalt precipitation agent is selected from one or more of ammonium persulfate, Carlo acid and beta-naphthol.

Optionally, the mass ratio of the cobalt precipitation agent to the cobalt in the cobalt-containing solution produced in the wet zinc smelting cadmium recovery process is (12-24): 1.

optionally, the conditions of the cobalt oxide precipitation reaction are as follows: the pH value of the system is 2.0-3.0, the temperature is 60-80 ℃, and the time is 0.5-2 h.

Optionally, the acid-containing solution is selected from one or two of a sulfuric acid solution and an electrolytic waste liquid in a wet zinc smelting system.

Optionally, the pickling conditions are as follows: the pH value of the system is 2.0-3.0, the temperature is 60-80 ℃, and the time is 0.5-1 h.

Optionally, the mass content of cobalt in the cobalt-rich slag is greater than 5%.

Optionally, the step of adding a cobalt precipitation agent into the cobalt-containing solution produced in the wet zinc smelting cadmium recovery process to perform an oxidation cobalt precipitation reaction to obtain cobalt precipitation ore pulp specifically includes:

adding a cobalt-containing solution produced in the wet zinc smelting cadmium recovery procedure into a reaction tank;

adding a cobalt precipitation agent into the cobalt-containing solution produced in the wet zinc smelting cadmium recovery procedure in the reaction tank, and carrying out oxidation cobalt precipitation reaction to obtain cobalt precipitation ore pulp.

Optionally, the step of adding an acid-containing solution into the cobalt precipitation ore pulp, performing acid washing, and performing solid-liquid separation to obtain a cobalt-poor solution and cobalt-rich slag specifically includes:

and adding an acid-containing solution into the cobalt-precipitated ore pulp in the reaction tank, carrying out acid washing, and carrying out solid-liquid separation by filtering to obtain a poor cobalt solution and cobalt-rich slag.

Has the advantages that: the invention provides a method for treating a cobalt-containing solution produced in a wet zinc smelting cadmium recovery process, which combines cobalt precipitation by oxidation and acid washing to obtain a cobalt-poor solution and cobalt-rich slag, wherein the cobalt content in the cobalt-poor solution is low, and the cobalt-poor solution can be directly returned to a purification system, so that the problems that the cobalt content in the cobalt-containing solution (before purification solution) produced in the wet zinc smelting cadmium recovery process in the prior art is high, the cobalt-containing solution enters the purification system to cause certain influence on the stable control of process impurities, and the unit consumption of zinc powder is increased are solved.

Drawings

FIG. 1 is a flow chart of a method for treating a cobalt-containing solution produced in a cadmium recovery process in wet zinc smelting in the embodiment of the invention.

FIG. 2 is a process flow diagram of a method for treating a cobalt-containing solution from a cadmium recovery process in a wet zinc metallurgy according to another embodiment of the present invention.

Detailed Description

The invention provides a method for treating cobalt-containing solution produced in a wet zinc smelting cadmium recovery process, which is further described in detail below in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the process of zinc hydrometallurgy, cobalt is a harmful impurity element, a leaching solution can be returned to a system for electrolysis after being purified and cobalt removed, part of cobalt enters a cadmium recovery process along with copper and cadmium residues in the purification and cobalt removal process, the cobalt enters a solution after the copper and cadmium residues are leached in the cadmium recovery process, and if the part of cobalt is not removed, the part of cobalt returns to the purification process, certain influence is caused on the stable control of process impurities, and the unit consumption of zinc powder is increased.

However, in the prior art, cobalt-containing solution obtained after copper-cadmium slag is leached in the cadmium recovery process is not treated and directly returned to a purification system, most of cobalt slag generated in the zinc smelting process is not recovered at present, and the cobalt slag is not priced and sold along with kiln slag, so that valuable metal cobalt is lost.

Based on this, an embodiment of the present invention provides a method for treating a cobalt-containing solution produced in a cadmium recovery process from zinc hydrometallurgy to remove cobalt in the cobalt-containing solution produced in the cadmium hydrometallurgy recovery process, as shown in fig. 1, where the method includes the steps of:

s1, adding a cobalt precipitation agent into the cobalt-containing solution produced in the wet zinc smelting cadmium recovery process, and carrying out oxidation cobalt precipitation reaction to obtain cobalt precipitation ore pulp;

and S2, adding an acid-containing solution into the cobalt precipitation ore pulp, carrying out acid washing, and carrying out solid-liquid separation to obtain a poor cobalt solution and cobalt-rich slag.

In the embodiment, cobalt-containing solution produced in the wet zinc smelting cadmium recovery process is treated by using cobalt precipitation through oxidation and acid washing to obtain poor cobalt solution and cobalt-rich slag, cobalt is precipitated through cobalt precipitation through oxidation to reduce the cobalt content in the solution to obtain poor cobalt solution, and zinc in the cobalt slag containing cobalt and valuable metals is further removed through acid washing cobalt precipitation ore pulp to further improve the cobalt content in the cobalt slag of the cobalt precipitation ore pulp to obtain cobalt-rich slag. The cobalt content in the poor cobalt solution is low, and the poor cobalt solution enters a purification system as a solution before purification, so that the problems that the cobalt content in the cobalt-containing solution (solution before purification) produced in the wet zinc smelting cadmium recovery process in the prior art is high, the cobalt-containing solution enters the purification system to cause certain influence on the stable control of process impurities and cause the increase of the unit consumption of zinc powder are solved; meanwhile, the method improves the enrichment of valuable metal cobalt, the cobalt content in the obtained cobalt-rich slag is high, the cobalt-rich slag can be sold according to cobalt concentrate, the income is obtained, and the problem of valuable metal cobalt loss caused by the fact that in the prior art, the cobalt slag is low in grade, most of the cobalt slag cannot be recycled, and the cobalt slag does not take out with the price of the kiln slag is solved. Therefore, the method for treating the cobalt-containing solution produced in the wet zinc smelting cadmium recovery process provided by the embodiment is simple to operate, the process is easy to control, the problem that most of cobalt slag cannot be recovered in the prior art, but is not sold with kiln slag together to cause loss of valuable metal cobalt is solved, and the problem that the cobalt content in the cobalt-containing solution (before-purification solution) produced in the wet zinc smelting cadmium recovery process in the prior art is high, enters a purification system to cause certain influence on stable control of process impurities, and causes increase of unit consumption of zinc powder is solved.

In an embodiment, in step S1, the cobalt-containing solution produced in the wet zinc smelting cadmium recovery process contains zinc ions, cobalt ions, cadmium ions, and iron ions.

When the cobalt-containing solution is produced by a wet zinc smelting cadmium recovery process, the cobalt-containing solution also contains zinc, cadmium, manganese, iron and other ions, when cobalt is precipitated by oxidation, cobalt is precipitated, and simultaneously, part of cadmium, manganese and iron are also precipitated to obtain cobalt precipitation ore pulp (containing insoluble cobalt, cadmium, manganese, iron and part of solid zinc salt carried), valuable metal zinc in the cobalt precipitation ore pulp enters the solution in a zinc ion form after acid washing, and a zinc-containing poor cobalt solution is returned to a zinc smelting system for use, so that the loss of valuable metal zinc is reduced, the cobalt-containing grade of cobalt-rich slag is improved, and the cobalt-rich slag reaches the standard of cobalt concentrate.

Specifically, a cobalt precipitation agent is added into the cobalt-containing solution produced in the wet zinc smelting cadmium recovery procedure to carry out oxidation cobalt precipitation reaction, wherein soluble divalent cobalt in the cobalt-containing solution produced in the wet zinc smelting cadmium recovery procedure is oxidized into trivalent insoluble cobalt; oxidizing soluble bivalent manganese in the cobalt-containing solution into tetravalent insoluble manganese; the soluble ferrous iron in the cobalt-containing solution is oxidized to trivalent, poorly soluble iron.

In one embodiment, the cobalt precipitation agent is selected from one or more of ammonium persulfate, Carlo acid, beta-naphthol, but not limited thereto.

Ammonium persulfate, also known as ammonium disulfate, is an ammonium salt with strong oxidizing and corrosive properties; caronic acid, also known as peroxysulfuric acid, peroxosulfuric acid, of the formula H₂SO₅The compound has strong oxidizing property, can be prepared from chlorosulfonic acid and hydrogen peroxide, and can also be prepared from concentrated sulfuric acid and hydrogen peroxide; beta-naphthol is an important organic chemical raw material and a dye intermediate, has wide application in the industries of dye, medicine, pesticide, polymer and the like, can be used for preparing tobias acid, and can also be used for preparing substances such as naproxen, naphthylamine, rubber antioxidant and the like. When the ammonium persulfate is selected as the cobalt precipitation agent,cobalt in Co (OH)₃Is precipitated, when Carlo acid is selected as cobalt precipitating agent, the cobalt is in the form of Co (OH)₃Is precipitated, when beta-naphthol is selected as the cobalt precipitating agent, the cobalt is in the form of Co (C)₁₀H₆ONO)₃The form of (a) is precipitated out.

In one embodiment, the mass ratio of the cobalt precipitation agent to the cobalt in the cobalt-containing solution produced in the wet zinc smelting cadmium recovery process is (12-24): 1. the required addition amount of the cobalt precipitation agent can be calculated by detecting the cobalt content in the cobalt-containing solution.

In one embodiment, the conditions of the cobalt oxide precipitation reaction are as follows: the pH value of the system is 2.0-3.0, the temperature is 60-80 ℃, and the time is 0.5-2 h. The pH of the system was adjusted by adding zinc hypoxide powder.

Under the condition, the method is more beneficial to the oxidation and cobalt precipitation reaction, more beneficial to the oxidation of bivalent cobalt into trivalent cobalt, and particularly beneficial to the oxidation of the soluble bivalent cobalt in the cobalt-containing solution into insoluble trivalent cobalt, and ensures that other valuable metals are only precipitated in a small amount.

In step S2, the amount of acid-containing solution may be selected according to actual conditions, an acid-containing solution is added to the precipitated cobalt ore slurry for acid washing, solid zinc salt in the precipitated cobalt ore slurry (containing insoluble cobalt, cadmium, manganese, iron and part of the solid zinc salt carried) is acid-washed so that the solid zinc salt enters the solution in the form of divalent zinc ions (soluble zinc), and after solid-liquid separation, cobalt-rich slag is obtained and cobalt-poor solution is also obtained. The cobalt content in the poor cobalt liquid is low, and the poor cobalt liquid is used as the purification pre-liquid to enter a purification system, so that the loss of valuable metal zinc is reduced, and certain influence on the stable control of process impurities caused by the high cobalt content in the purification pre-liquid in the prior art can be avoided; meanwhile, as the valuable metal zinc is pickled in the solution, the cobalt-containing grade of the cobalt-rich slag is improved, and the problem that the valuable metal cobalt is lost because most of the cobalt slag cannot be recycled and sold together with the kiln slag without counting in the prior art is solved. That is to say, in the embodiment, the acid washing reduces the zinc content in the cobalt slag, thereby improving the cobalt content in the cobalt slag, obtaining the cobalt-rich slag, and simultaneously recovering the zinc in the cobalt slag, so that the zinc returns to the zinc smelting system, and the loss of valuable metal zinc is avoided.

In one embodiment, the concentration of hydrogen ions in the acid-containing solution is 140-160 g/L.

In one embodiment, the acid-containing solution is selected from one or two of a sulfuric acid solution and an electrolytic waste liquid in a wet zinc smelting system, but is not limited thereto. In this embodiment, the acid contained in the electrolytic waste liquid in the wet zinc smelting system is mainly sulfuric acid.

In one embodiment, the acid wash conditions are: the pH value of the system is 2.0-3.0, the temperature is 60-80 ℃, and the time is 0.5-1 h.

In this embodiment, the PH of the system can be adjusted by adjusting the amount of sulfuric acid or electrolytic waste produced by the zinc smelting system.

The reaction condition of the acid washing can ensure that the acid and the solid zinc react relatively completely, valuable metal zinc carried in the cobalt precipitation ore pulp is washed out and enters the solution, and the solution returns to a wet zinc smelting system for application, and the acid and the insoluble cobalt do not react, so that the insoluble cobalt is not washed out and is left in the cobalt-rich slag. That is, the pickling conditions in the present embodiment can selectively wash out solid zinc so that the poorly soluble cobalt remains in the cobalt-rich slag without being washed out.

The embodiment further reduces the loss of metal zinc and improves the cobalt-containing grade of the cobalt-rich slag.

In one embodiment, the cobalt content in the cobalt-rich slag is more than 5% by mass, and the cobalt content of the cobalt-rich slag meets the requirement standard that the cobalt content of the takeaway cobalt concentrate is more than 5%, and the cobalt-rich slag can be processed according to the cobalt concentrate, so that the loss of valuable metal cobalt is avoided.

In one embodiment, the method for treating the cobalt-containing solution produced in the cadmium recovery process in wet zinc smelting specifically comprises the following steps:

adding a cobalt-containing solution produced in the wet zinc smelting cadmium recovery procedure into a reaction tank;

adding a cobalt precipitation agent into a cobalt-containing solution produced in the wet zinc smelting cadmium recovery procedure in a reaction tank, and carrying out oxidation cobalt precipitation reaction to obtain cobalt precipitation ore pulp;

and adding an acid-containing solution into the cobalt-precipitated ore pulp in the reaction tank, carrying out acid washing, and carrying out solid-liquid separation by filtering to obtain a poor cobalt solution and cobalt-rich slag.

In the embodiment, cobalt-containing solution produced in the wet zinc smelting cadmium recovery process is sequentially subjected to cobalt oxidation, cobalt precipitation and acid pickling in the same reaction tank to obtain cobalt-rich slag and cobalt-poor solution, no additional reaction equipment and filter pressing equipment (only simple filtration) are needed, equipment investment is reduced, system energy consumption is saved to the maximum extent while production efficiency is improved, the problems that cobalt-poor slag in the prior art is low in cobalt content and cannot be recovered, valuable metal loss is caused are solved, and meanwhile, the problem that cobalt content in solution before purification is high in the prior art, the solution directly enters a purification system to cause certain influence on stable control of process impurities, and single consumption of zinc powder is increased is avoided.

The method for treating the cobalt-containing solution produced in the cadmium recovery procedure of wet zinc smelting provided by the invention is described in detail by taking a process flow diagram shown in fig. 2 as an example, the cobalt-containing solution produced in the cadmium recovery procedure of wet zinc smelting is added into a reaction tank, the temperature is heated to 60-80 ℃, a cobalt precipitation agent is added into the reaction tank for carrying out oxidation cobalt precipitation for 0.5-2h, the pH value of a solution system is 2.0-3.0, electrolytic waste liquid produced in the zinc smelting procedure of wet method is added at the same temperature after reaction for carrying out acid washing for 0.5-1h, the pH value of the solution system is kept at 2.0-3.0, solid-liquid separation is carried out after reaction, cobalt-rich slag and cobalt-poor liquid are obtained, wherein the cobalt-rich slag is sold outside, and the cobalt-poor liquid enters a purification system or enters a zinc smelting system to be used as a leaching agent in a neutral ore roasting leaching procedure.

The invention is further illustrated by the following specific examples.

Example 1

Adding 1L of cobalt-containing solution (containing 0.243g of cobalt) produced in the wet zinc smelting cadmium recovery process into a reaction tank, heating to 80 ℃, adding 3g of ammonium persulfate, adjusting the pH value of the system to 2.0 by adding zinc hypoxide powder, controlling the reaction time to be 0.5h, and obtaining cobalt-precipitated ore pulp after the reaction is finished. The mass content of cobalt in the cobalt sediment of the cobalt precipitation ore pulp is only 3.0-3.5%, and the cobalt-containing requirement standard of the takeaway cobalt concentrate can not be met.

Example 2

Adding 1L of cobalt-containing solution (containing 0.243g of cobalt) produced in the wet zinc smelting cadmium recovery process into a reaction tank, heating to 80 ℃, adding 3g of ammonium persulfate, adjusting the pH value of the system to 2.0 by adding zinc hypoxide powder, and reacting for 0.5h to obtain cobalt-precipitated ore pulp.

And adding electrolytic waste liquid into the cobalt precipitation ore pulp at the temperature of 80 ℃ to ensure that the pH value of the system is 2.0, and reacting for 0.5h to obtain cobalt-rich slag with the cobalt content of 7.7% by mass, wherein the cobalt-rich slag meets the requirement standard that the cobalt content of the takeaway cobalt concentrate is more than 5%.

Example 3

Adding 1L of cobalt-containing solution (containing 0.243g of cobalt) produced in the wet zinc smelting cadmium recovery process into a reaction tank, heating to 80 ℃, adding 4g of ammonium persulfate, adjusting the pH value of the system to 2.0 by adding zinc hypoxide powder, and reacting for 0.5h to obtain cobalt-precipitated ore pulp.

And adding electrolytic waste liquid into the cobalt precipitation ore pulp at 70 ℃ to ensure that the pH value of the system is 2.5, reacting for 1.0h to obtain cobalt-rich slag with the cobalt content of 6.5 percent, and meeting the requirement standard that the cobalt content of the takeaway cobalt concentrate is more than 5 percent.

Example 4

Adding 1L of cobalt-containing solution (containing 0.243g of cobalt) produced in the wet zinc smelting cadmium recovery process into a reaction tank, heating to 80 ℃, adding 5g of ammonium persulfate, adjusting the pH value of the system to 2.5 by adding zinc hypoxide powder, and reacting for 0.5h to obtain cobalt-precipitated ore pulp.

And adding electrolytic waste liquid into the cobalt precipitation ore pulp at the temperature of 60 ℃ to ensure that the pH value of the system is 3.0, reacting for 1.0h to obtain cobalt-rich slag with the cobalt content of 4.3% by mass, wherein the cobalt-rich slag does not meet the requirement standard that the cobalt content of the cobalt concentrate is more than 5%.

From the above examples, it can be seen that the mass content of cobalt in the cobalt-rich slag obtained by increasing the reaction temperature of the system and reducing the reaction pH value of the system is greater than 7%, but the problem of high energy consumption due to the large steam consumption of the system exists, and therefore, the reaction temperature is preferably controlled to be 70 ℃.

In the above examples, the cobalt content of the cobalt-rich slag was improved compared to the treatment without pickling. The cobalt precipitation ore pulp is not subjected to acid washing, the mass content of cobalt in the obtained cobalt slag is only 3.0-3.5%, and the requirement of cobalt content in the takeaway cobalt concentrate cannot be met.

In conclusion, the invention provides a method for treating a cobalt-containing solution produced in a wet zinc smelting cadmium recovery process, wherein a cobalt-poor solution and cobalt-rich slag are obtained through cobalt oxidation precipitation and acid washing, the cobalt content in the obtained cobalt-rich slag is high, and the cobalt-rich slag can be sold according to cobalt concentrate, so that the problem that most of the cobalt slag produced in the zinc smelting process in the prior art cannot be recovered, but is not sold with kiln slag to cause loss of valuable metal cobalt is solved, and meanwhile, after acid washing, valuable metal zinc enters the cobalt-poor solution and returns to a zinc smelting system for application, so that the loss of valuable metal zinc is avoided; the obtained poor cobalt solution has low cobalt content and enters a purification system as a solution before purification, so that the problems that the cobalt content in the solution before purification is high, the solution enters the purification system to cause certain influence on the stable control of process impurities and the unit consumption of zinc powder is increased in the prior art can be solved. In addition, the cobalt-containing solution can be subjected to cobalt oxidation precipitation and acid washing in the same reaction tank in sequence to obtain cobalt-rich slag and cobalt-poor solution, reaction equipment and filter pressing equipment are not required to be additionally arranged (only simple filtration is adopted), equipment investment is reduced, production efficiency is improved, and system energy consumption is saved to the maximum extent.

It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.