Extraction process for preparing electronic-grade cobalt sulfate from cobalt-containing waste material

An electronic grade, cobalt sulfate technology, applied in the field of extraction process, can solve the problems of high impurity content, raw material limitation, low total cobalt recovery rate, etc., and achieves the effect of high comprehensive recovery rate, short process flow, and advanced performance.

Active Publication Date: 2011-02-16
HUNAN JINYUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some problems in these existing methods: one is that it is difficult to produce high-purity cobalt sulfate, and its impurity content is high, which cannot meet the high requirements of users for electronic-grade products; Low metal cobalt, cobalt alloy waste, cobalt compound w

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The present invention will be further described below in conjunction with embodiment. Embodiment 1: An extraction process for producing electronic-grade cobalt sulfate with cobalt-containing waste materials, preparing crude Co feed liquid before extraction: first, raw material acid decomposition: the waste cobalt alloy liquid after wet milling and pulping, with dilute hydrochloric acid Or dilute sulfuric acid, adding an oxidizing agent such as hydrogen peroxide to carry out acid decomposition, so that cobalt and nickel, iron, copper, zinc, manganese, calcium, magnesium and other acid-soluble metals or impurities are separated from non-acid-soluble tungsten carbide, and then filtered, washed and separated , filter the acid solution after the above acid decomposition, wash the residue, separate and recover tungsten carbide, extract sponge copper and iron hydroxide, and finally obtain crude cobalt feed liquid. The crude cobalt feed liquid is extracted with P204, the ratio ...

Embodiment 2

[0030] Example 2: The proportioning of P204 extractant is 20% of P204 and 80% of 206 solvent naphtha; the proportioning of N235 extractant is 10% of N235, 10% of 2-octanol and 80% of 206 solvent naphtha. Others are the same as embodiment one. Main technical indicators: the total recovery rate of cobalt is 98.50%; battery grade cobalt sulfate product composition: cobalt (Co) 20.75%, copper (Cu) 0.0001, iron (Fe) 0.0004, manganese (Mn) 0.0003, calcium (Ca) 0.0009, Magnesium (Mg) 0.0006, Potassium (K) 0.0001, Sodium (Na) 0.0003, Zinc (Zn) 0.0001, Nickel (Ni) 0.0008, Chromium (Cr) 0.0004, Lead (Pb) 0.0003, Arsenic (As) <0.0001, Cadmium (Cd) 0.0006, mercury (Hg) < 0.00001, chloride 0.014, nitrate 0.005.

Embodiment 3

[0031] Embodiment 3: the proportioning of P204 extraction agent is the 206 solvent naphtha of 22% P204 and 84%; Embodiment one. Main technical indicators: the total recovery rate of cobalt is 98.15%; battery grade cobalt sulfate product composition: cobalt (Co) 20.66%, copper (Cu) 0.0005, iron (Fe) 0.0005, manganese (Mn) 0.0003, calcium (Ca) 0.0004, Magnesium (Mg) 0.0005, Potassium (K) 0.0005, Sodium (Na) 0.0005, Zinc (Zn) 0.0005, Nickel (Ni) 0.0008, Chromium (Cr) 0.0004, Lead (Pb) 0.0003, Arsenic (As) 0.0004, Cadmium ( Cd) 0.0003, mercury (Hg) 0.0002, chloride 0.023, water insoluble matter ≤ 0.011.

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Abstract

The invention discloses an extraction process for preparing electronic-grade cobalt sulfate from a cobalt-containing waste material, and relates to an extraction method for cobalt salt. The process comprises the following steps of: performing acidolysis; filtering and separating; removing iron and copper; preparing rough Co material liquid; removing impurities by P204 extraction; and separating Co and Ni by P507 extraction; and the process is characterized in that an N235 extracting agent is prepared from 8 to 12 volume percent of N235, 8 to 12 volume percent of 2-octanol and 76 to 84 volume percent of 206 solution oil; and the prepared N235 extracting agent is added into raffinate of the P204 extraction and is subjected to six stages of extraction, two stages of hydrochloric acid washing, six stages of washing, three stages of ammonia water washing and one stage of sulfuric acid washing. The process has good impurity removal effect; compared with the prior art, the process has the advantages that: one order of magnitude is reduced, particularly, impurities such as cadmium, lead and the like which are difficult to remove are removed by P204 extraction and the P507 extraction, and the impurities reach an extremely low degree. The process has short flow, the comprehensive recovery rate of cobalt is high and the production cost is lower than the average cost of the same domestic industry.

Description

technical field [0001] The invention relates to an extraction process for producing electronic-grade cobalt sulfate from waste materials containing cobalt. [0002] Background technique [0003] At present, there are two types of cobalt sulfate production technologies at home and abroad: electrolysis method and chemical reaction method. The preparation of cobalt sulfate by chemical reaction method varies according to different raw materials: such as the Chinese invention patent with the patent number ZL96105194.9 (hereinafter referred to as the existing Technology 1) The process adopted is: metal cobalt is prepared with hydrochloric acid to produce metal cobalt solution—adding sulfuric acid to heat up to produce cobalt sulfate solution—drying cobalt sulfate solution to produce cobalt sulfate crystals; another example is "Research and Production Practice of New Technology for Cobalt Slag Treatment" Guan Yajun World Nonferrous Metals 2006 No. 4 (hereinafter referred to as pri...

Claims

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Application Information

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IPC IPC(8): C22B23/00C22B3/08C22B3/26C22B7/00
CPCY02P10/20
Inventor 刘训兵
Owner HUNAN JINYUAN NEW MATERIALS CO LTD
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