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Method for removing impurities from nickel solutions using reusable polymetallic salts as complexing agents

A multi-metal salt and nickel solution technology, which is applied in the direction of improving process efficiency, can solve the problems of not being able to achieve deep desiliconization and increase the burden of impurity removal in subsequent processes, and achieve the effects of low cost, good effect and high efficiency

Active Publication Date: 2022-08-05
广东芳源新材料集团股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned method for removing silicon is mainly aimed at the removal of impurity silicon in other system high-silicon solutions, and the method for deep silicon removal in nickel solution has not been reported yet, and the silicon content in the solution after the above-mentioned method is still 0.2g / L ( 200ppm), this type of method cannot achieve the purpose of deep desiliconization; at the same time, the addition of silicon removal agent in the impurity removal process will introduce other impurity ions into the solution, increasing the burden of impurity removal in subsequent processes

Method used

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  • Method for removing impurities from nickel solutions using reusable polymetallic salts as complexing agents
  • Method for removing impurities from nickel solutions using reusable polymetallic salts as complexing agents
  • Method for removing impurities from nickel solutions using reusable polymetallic salts as complexing agents

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Effect test

Embodiment approach 1

[0138] Add sodium molybdate with 1.5 times the molar content of Si and P heteroelements to the nickel solution, adjust the pH value of the nickel solution to 3.0, stir at room temperature for 1 hour, and then add the volume component ratio of 10% N235+30% isooctanol+ 60% kerosene heteropolyacid extractant, the volume ratio of the addition amount of the heteropolyacid extractant to the nickel solution is 1:1, and after mixing 5min, stand for stratification, and the raffinate (nickel) with Si, P impurity content below 1ppm is obtained by separation. solution) and organic phase.

Embodiment approach 2

[0140] Add ammonium molybdate with 1.5 times the molar content of Si and P heteroelements to the nickel solution, adjust the pH value of the nickel solution to 4.0, stir at room temperature for 1 hour, and then add the volume component ratio of 5% N235+50% sec-octanol+ 45% kerosene heteropolyacid extractant, the volume ratio of the addition amount of the heteropolyacid extractant to the nickel solution is 1:1, and after mixing 10min, it is left to stand for stratification, and the raffinate (nickel) with Si, P impurity content below 1ppm is obtained by separation solution) and organic phase.

Embodiment approach 3

[0142] Add potassium molybdate with 1.3 times the molar content of Si and P heteroelements to the nickel solution, adjust the pH value of the nickel solution to 2.0, stir for 2 hours at room temperature, and then add the volume component ratio of 20% N235+50% n-octanol+ 30% kerosene heteropolyacid extractant, the volume ratio of the addition amount of the heteropolyacid extractant to the nickel solution is 1:1, and after mixing 15min, stand for stratification, and the raffinate (nickel) with Si, P impurity content below 1ppm is obtained by separation. solution) and organic phase.

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Abstract

The invention discloses a method for removing impurities from a nickel solution by using a reusable polymetallic salt as a complexing agent. The multielement and the heteroelement are used to form a heteropolyacid, so that the heteroelement in the nickel solution is in the form of the heteropolyacid. Complexation, in the removal of Si, P and other impurities in the nickel solution, obtained obvious effects. At the same time, the organic loaded in the heteropolyacid extractant is recovered after stripping, the multi-element components are recovered after precipitation, and the acidified first acid medium solution is reconstituted with acid to adjust the concentration and recovered. The material of the reaction process can be recovered and re-entered into the next batch of reaction, which is of great significance for obtaining battery-grade nickel solution at low cost, and has the advantages of high efficiency, high yield and low cost.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgical production, in particular to a method for removing impurities from a nickel solution using a reusable polymetallic salt as a complexing agent. Background technique [0002] Nickel-cobalt-manganese ternary cathode material is a new type of cathode material for lithium-ion batteries. It has the advantages of high capacity, good thermal stability and low price. It can be widely used in small lithium batteries and lithium-ion power batteries. The product of lithium cobalt oxide has a much higher cost performance than lithium cobalt oxide, and its capacity is 10-20% higher than that of lithium cobalt oxide. It is one of the new battery materials most likely to replace lithium cobalt oxide. It is called the third-generation lithium-ion battery. For cathode materials, the domestic annual demand for cathode materials gradually replaces lithium cobalt oxide with an annual growth rate of 20%. At...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/00C22B3/44C22B3/22C22B3/40
CPCC22B23/0461C22B3/44C22B3/22C22B3/402Y02P10/20
Inventor 吴芳龙全安罗爱平
Owner 广东芳源新材料集团股份有限公司
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