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Pretreatment method of extraction agent for cobalt-nickel separation and corresponding extraction method

A technology of pretreatment and extraction agent, applied in the field of extraction agent for nickel separation and cobalt, which can solve the problems of difficult recycling, high COD extraction wastewater, etc.

Active Publication Date: 2021-07-06
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above method, the extractant does not need to be saponified, and the pH value of the aqueous phase is controlled by a weak acid buffer system during the extraction process, which simplifies the extraction process and reduces the consumption of acid and alkali, but the raffinate contains organic matter and is difficult to be recycled. , resulting in a large amount of high COD extraction wastewater

Method used

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  • Pretreatment method of extraction agent for cobalt-nickel separation and corresponding extraction method
  • Pretreatment method of extraction agent for cobalt-nickel separation and corresponding extraction method
  • Pretreatment method of extraction agent for cobalt-nickel separation and corresponding extraction method

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Experimental program
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Effect test

Embodiment 1

[0042] Extractant pretreatment is performed by the following steps:

[0043] Using sulfonated kerosene as a diluent, the extractant P507 and Cyanex272 were respectively prepared into multiple groups of organic phases with a concentration of 0.25mol / L;

[0044] Mix multiple groups of sodium acetate aqueous solutions of different concentrations as shown in Table 1 with the organic equal volume ratio of the above-mentioned extractant for 15 minutes, then stand for phase separation, and take the obtained organic phase as the pretreated extractant.

[0045] In above-mentioned process, test sodium acetate aqueous solution before and after being used for the pH value of pretreatment, result is as shown in table 1:

[0046] Table 1 Changes in the pH value of the extractant treated with different concentrations of sodium acetate solution

[0047]

[0048] It can be seen that after the sodium acetate solution is treated with the acidic extractant, due to the H +, the pH value decre...

Embodiment 2

[0052] The pretreated extractant obtained by pretreating 0.25mol / L P507 with 3mol / L sodium acetate solution in Example 1 extracts and separates cobalt and nickel mixed feed liquid, wherein the feed liquid is 2g / L Co 2+ and 2g / L Ni 2+ The dilute sulfuric acid aqueous solution, the extraction conditions are: temperature 25 ℃, relative O / A is 1R1, extraction equilibrium time is 15min, the extraction process is as attached figure 1 As shown, the extraction results are shown in Table 2. In the following table and the following examples, the extraction rate is the same extraction rate obtained by extracting the mixed solution of cobalt and nickel coexisting:

[0053] Table 2 Extraction Results

[0054]

[0055] It can be seen that the raffinate obtained from different feed liquids with an initial pH value in the range of 4.60 to 5.80 has the same pH value, and the extraction effect is similar, indicating that the application of the pretreatment method of the present invention do...

Embodiment 3

[0057] The pretreated extractant obtained by pretreating 0.25mol / L P507 with 2mol / L sodium acetate solution in Example 1 extracts and separates cobalt and nickel mixed feed liquid, wherein the feed liquid is 2g / L Co 2+ and 2g / L Ni 2+ pH = 5.40 dilute sulfuric acid aqueous solution, the extraction conditions and process are the same as in Example 2.

[0058] After extraction, the test shows that the raffinate pH value of this embodiment is 5.01, the extraction rates of cobalt and nickel are 94.62% and 17.34%, respectively, and the separation factor is 83.76.

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Abstract

The invention discloses a pretreatment method of an extraction agent for cobalt-nickel separation and a corresponding extraction method. The pretreatment method comprises the step that the acidic extraction agent is pretreated through a weak-acid and strong-alkali salt pretreatment agent. According to the method, the extraction technology can be effectively simplified, the consumption of acid and alkali in the extraction process and the emission of secondary pollutants such as salt and organic matters are reduced, and meanwhile, the extraction separation efficiency and the cyclic utilization rate are relatively high.

Description

technical field [0001] The invention relates to the technical field of extractants for cobalt and nickel separation. Background technique [0002] Cobalt is a very important non-ferrous metal, which plays a very important role in the manufacture of alloys, lithium-ion batteries and other materials. The recovery and reuse of ore and waste resources is the main way to obtain cobalt. In terms of ore acquisition, because the chemical properties of cobalt and nickel are very similar, there is often a phenomenon of symbiosis and association between the two in ore deposits. Separation; in the recycling of waste resources, various cobalt-containing solid wastes often contain nickel, such as waste lithium-ion battery anode materials, waste catalysts, nickel smelting converter slag, etc. Therefore, it is also necessary to carry out cobalt and nickel Separation, that is, to obtain high-purity cobalt, efficient separation of cobalt and nickel is often the key to technology. [0003] D...

Claims

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Application Information

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IPC IPC(8): C22B23/00C22B3/38
CPCC22B23/00Y02P10/20
Inventor 赵云斌徐坤坤
Owner HUAZHONG UNIV OF SCI & TECH