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Method for recycling valuable metal from cobalt white alloy

A cobalt white alloy and valuable metal technology, applied in the direction of improving process efficiency, can solve the problems of unformed processing technology, low metal leaching rate, only 90%, etc., and achieve high added value of products, high recovery rate, low cost effect

Active Publication Date: 2009-06-24
GUANGDONG BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, cobalt white alloy has strong corrosion resistance and is difficult to treat. In foreign countries, sulfuric acid pressure leaching or electrolytic treatment is often used, but the metal leaching rate is low.
For example, Cominco Corporation in Canada has developed a pressurized leaching technology called CESL for short. It grinds the material to a certain particle size and sends it into an autoclave. It is leached with sulfuric acid at a temperature of 150°C, and the leaching rate is only 90%. mature processing technology

Method used

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  • Method for recycling valuable metal from cobalt white alloy
  • Method for recycling valuable metal from cobalt white alloy
  • Method for recycling valuable metal from cobalt white alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] After the cobalt white alloy is ball-milled, weigh 300g of the 80-mesh sieve and add it into a three-necked flask with a volume of 3L; configure 1.8L of 2mol / L sulfuric acid and pour it into the same flask. Put the beaker into a constant temperature water bath, adjust the temperature to 90°C, keep mechanical stirring, and adjust the speed to 800 rpm. Then feed chlorine gas into the three-necked bottle at a flow rate of 1L / min. After the unreacted chlorine gas overflows, it can be absorbed by lye or recycled. After reacting for 5 hours, after filtering, the filtrate was settled to 2.0L, and adopted EDTA complexometric titration, flame atomic absorption spectrometry and plasma emission spectrometry (ICP) to detect metal element content in the leachate as follows:

[0023]

[0024] After calculation, the leaching rates of cobalt, copper and iron are 99.5%, 99.6% and 99.8% in sequence.

Embodiment 2

[0026] Take 1 L of the filtrate of Example 2, configure 1 L of organic phase (the composition is 20% N902 + 80% 260# solvent oil), perform two-stage countercurrent extraction, and control the extraction equilibrium pH value to 2.0. After the extraction and separation, the remaining aqueous solution was settled to the original volume, and the metal element content was detected by EDTA complexometric titration, flame atomic absorption spectrometry and plasma emission spectrometry (ICP) as follows:

[0027]

[0028] That is, the copper in the solution is basically extracted into the organic phase, and the nickel, cobalt and manganese are slightly lost. The extraction rate of copper is calculated to be 99.5%.

[0029] The organic phase is back-extracted with sulfuric acid to obtain a copper sulfate solution of about 40g / l, and the copper sulfate product is obtained after crystallization. The quality analysis of the product is as follows:

[0030]

[0031] It meets the requ...

Embodiment 3

[0033] Get 500ml of the raffinate in Example 2 and put it into a three-necked flask, add 2.40g of oxidant sodium chlorate, and add an appropriate amount of NaOH to adjust the pH value of the system to 1.5; put the flask into a constant temperature water bath, and adjust the temperature to 90 ℃, keep mechanical stirring, the stirring intensity is 500 rpm, after the yellow precipitate precipitates, add NaOH appropriately, keep the pH value of the system between 2.0 and 2.5, react for 2 hours, filter and wash the solution for several times Capacity to 1L, adopt EDTA complexometric titration, flame atomic absorption spectrometry and plasma emission spectrometry (ICP) to detect its metal element content as follows:

[0034]

[0035] That is, only a small amount of iron remains in the solution, and cobalt is slightly lost. After calculation, the iron removal rate is 98.5%, and the iron removal effect is better.

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Abstract

The invention discloses a method for recovering valuable metals from cobalt white alloy. The method comprises the following main steps: after the cobalt white alloy undergoes ball milling, chlorine and sulphuric acid solution are used for leaching; lixivium adopts N902 to extract copper, and bluestone is prepared after a copper-containing organic phase undergoes back extraction; extraction raffinate undergoes iron elimination by means of using amarillite, extraction and edulcoration by means of using P204, and then the separation of nickel and cobalt by means of using the N902; and cobalt chloride is prepared after a cobalt-containing organic phase undergoes back extraction. The method has simple process and high copper and cobalt recovery rate, the obtained bluestone satisfies quality product requirements of the national standard GB437-93, and the obtained cobalt chloride satisfies feed-grade requirements of the national standard GB437-93.

Description

technical field [0001] The invention belongs to the field of metallurgy, and more specifically relates to a method for recovering valuable metals from cobalt white alloy and preparing them into cobalt chloride and copper sulfate. Background technique [0002] Cobalt white alloy is an alloy material containing cobalt, copper, iron and other elements. It is widely used in precision instruments, medical equipment, communication industry, various parts and elastic components in sanitary engineering, daily necessities, etc., so every year There is a large amount of this waste generated. At the same time, with the increasing global cobalt consumption and the relative lack of cobalt resources in China, some domestic companies have imported cobalt resources from African countries such as the Democratic Republic of the Congo and Zambia. Recently, the government of the Democratic Republic of the Congo has introduced a policy to restrict the export of cobalt ore in the country and enc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B15/00C22B23/00C22B3/08
CPCY02P10/20
Inventor 李长东黄国勇徐盛明
Owner GUANGDONG BRUNP RECYCLING TECH
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