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Method for preparing battery-grade cobalt sulfate and cobalt chloride by acid dissolution of cobalt beans and cobalt plates

A battery-grade, cobalt plate acid technology, applied in cobalt sulfate, chemical instruments and methods, cobalt halide, etc., can solve the problems of excessive iron content and high acidity, and achieve the effect of strong applicability, low cost and strong operability

Pending Publication Date: 2021-12-31
江西江钨钴业有限公司
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  • Description
  • Claims
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Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for preparing cobalt chloride and cobalt sulfate by using cobalt beans and cobalt plates, so as to solve the problems of high acidity and excessive iron content in the leach solution of cobalt beans and cobalt plates

Method used

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  • Method for preparing battery-grade cobalt sulfate and cobalt chloride by acid dissolution of cobalt beans and cobalt plates

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The raw material is cobalt beans. The leaching solution of cobalt beans leached with heated sulfuric acid contains: 131.0g / L of Co 2+ , 0.52g / L of Fe 2 + , H of 0.61 + .

[0038] Add hydrogen peroxide as an oxidant to the above leaching solution, and the amount of hydrogen peroxide introduced is Fe 2+ 2.8 times the total number of moles, the hydrogen peroxide solution is added to the leaching solution from the middle of the reactor through a metering pump. The reaction temperature is 45°C, the reaction time is 1h, and the reaction is carried out under normal pressure. Then add ammonium bicarbonate to the leaching solution to neutralize H + , the added amount is H + 0.98 times the total number of moles. After that, the solid-liquid is densely separated, the slag phase is sent to the slag washing process, the washing water is returned to the first step as leaching bottom water, and the liquid phase is sent to MVR crystallization or takeaway.

[0039] The cobalt l...

Embodiment 2

[0041] The raw material is cobalt beans. The cobalt bean leaching solution leached with heated sulfuric acid contains: 127.5g / L Co 2+ , 0.44g / L of Fe 2 + , 0.52N H + .

[0042] Add hydrogen peroxide as an oxidant to the above leaching solution, and the amount of hydrogen peroxide introduced is Fe 2+ 2.4 times the total number of moles, the hydrogen peroxide solution is added to the leaching solution from the middle of the reactor through a metering pump. The reaction temperature is 58° C., the reaction time is 1 h, and the reaction is carried out under normal pressure. Then add ammonia water to the leaching solution to neutralize the H + , the added amount is H + 0.99 times the total number of moles. After that, the solid-liquid is densely separated, the slag phase is sent to the slag washing process, the washing water is returned to the first step as leaching bottom water, and the liquid phase is sent to MVR crystallization or takeaway.

[0043] The cobalt liquid obt...

Embodiment 3

[0045] The raw material is cobalt beans. The leaching solution of cobalt beans leached with heated sulfuric acid contains: 133.8g / L of Co 2+ , 0.27g / L Fe 2 + , 0.48N H + .

[0046] Add hydrogen peroxide as an oxidant to the above leaching solution, and the amount of hydrogen peroxide introduced is Fe 2+ 2.5 times the total number of moles, the hydrogen peroxide solution is added to the leaching solution from the middle of the reactor through a metering pump. The reaction temperature is 50°C, the reaction time is 1h, and the reaction is carried out under normal pressure. Then add urea to the leaching solution to neutralize the H + , the added amount is H + 0.48 times the total number of moles. After that, the solid-liquid is densely separated, the slag phase is sent to the slag washing process, the washing water is returned to the first step as leaching bottom water, and the liquid phase is sent to MVR crystallization or takeaway.

[0047] The cobalt liquid obtained by d...

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Abstract

The invention provides a method for preparing battery-grade cobalt sulfate and cobalt chloride by acid dissolution of cobalt beans and cobalt plates. The method comprises the following steps: taking cobalt beans or cobalt plates, adding a sulfuric acid solution into the cobalt beans or cobalt plates, and heating to quickly dissolve the cobalt beans or cobalt plates. After the cobalt solution reaches a certain concentration, opening to a purification section, adding an oxidizing agent to oxidize ferrous iron in the cobalt solution, and adding a neutralizing agent to consume hydrogen ions in the cobalt solution, so that the pH value of the cobalt solution is increased; and filtering to obtain a clean cobalt solution, and sending the clean cobalt solution to MVR evaporation to obtain battery-grade cobalt sulfide or cobalt chloride. Wherein the oxidizing agent is selected from one or more of oxygen-containing gas and peroxy-radical-containing salt; and a neutralizer is selected from one or more of ammonia-containing substances and urea. The method for preparing the battery-grade cobalt sulfate or cobalt chloride through acid dissolution of the cobalt beans and the cobalt plates is high in applicability and operability. According to the method, battery-grade cobalt sulfate or cobalt chloride can be directly obtained through a non-extraction means, the technological process is shortened, and the cost is lower.

Description

technical field [0001] The invention relates to the field of cobalt smelting, in particular to a method for preparing battery-grade cobalt sulfate and cobalt chloride by acid-dissolving cobalt beans and cobalt plates. Background technique [0002] With the rise of lithium batteries, the use of cobalt has changed from traditionally mostly used in the manufacture of ferromagnetic materials to mainly used in the manufacture of lithium cobalt oxide, ternary and other lithium batteries. Lithium cobaltate and ternary are prepared from cobalt chloride and cobalt sulfate. my country's cobalt reserves are seriously insufficient, and cobalt basically depends on imports. Many domestic cobalt smelting enterprises, in order to solve the problem of raw material supply stability, often use a variety of cobalt-containing raw materials in combination. Among them, cobalt beans and cobalt slabs have higher purity and are more convenient to transport and store, making them good raw materials ...

Claims

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Application Information

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IPC IPC(8): C01G51/10C01G51/08
CPCC01G51/10C01G51/085
Inventor 兰秋平何文龙徐超谢臣珍段伟肖璠吴世发
Owner 江西江钨钴业有限公司
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