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Method for separating and recovering cobalt from chromium-containing waste hard alloy

A cemented carbide, separation and recycling technology, applied in the direction of improving process efficiency, can solve problems such as large limitations, and achieve the effects of reducing recycling cost, low energy consumption, and wide application range

Pending Publication Date: 2021-09-24
XIANDAO THIN FILM MATERIALS GUANGDONG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can electrolytically produce metal cobalt from waste cemented carbide, the electrochemical method is generally only suitable for processing waste cemented carbide materials with a cobalt content greater than 8%, and is not applicable to most cemented carbide materials. sex big

Method used

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  • Method for separating and recovering cobalt from chromium-containing waste hard alloy
  • Method for separating and recovering cobalt from chromium-containing waste hard alloy
  • Method for separating and recovering cobalt from chromium-containing waste hard alloy

Examples

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Effect test

Embodiment 1

[0043] A method for separating and recovering cobalt from chromium-containing waste cemented carbide, the steps are as follows:

[0044] (1) Take waste cemented carbide and waste cemented carbide, the main phase of which is Cr 3 C 2 (accounting for about 1% of the alloy mass), WC and Co;

[0045] (2) calcining the waste cemented carbide at 850° C. for 4 hours, and rolling ball milling for 12 hours to obtain oxidized powder;

[0046] (3) Mix the oxidized powder and sodium hydroxide evenly at a mass ratio of 1:2, then add 4 times the volume of deionized water, place it in a high-pressure reactor, adjust the pressure to 1.0MPa, and the stirring speed is 200r / min, pressure cook at 150°C for 6 hours, filter after completion of pressure cooking;

[0047] (4) Wash the filter residue obtained in step (3) with deionized water for 3 times, then wash with ethanol once, and then dry at 120° C. for 4 hours to obtain a loose and uniform powder;

[0048] (5) Take 50 g of the powder obta...

Embodiment 2

[0056] A method for separating and recovering cobalt from chromium-containing waste cemented carbide, the steps are as follows:

[0057] (1) Take waste and old cemented carbide Take waste and old cemented carbide Take waste and old cemented carbide, its main phase is Cr 3 C 2 (about 2% of the alloy mass), WC and Co;

[0058] (2) calcining the waste cemented carbide at 850° C. for 5 hours, and rolling ball milling for 24 hours to obtain oxidized powder;

[0059] (3) Mix the oxidized powder and sodium hydroxide evenly with a mass ratio of 1:1.2, then add 2 times the volume of deionized water, place it in a high-pressure reactor, adjust the pressure to 1.5MPa, and the stirring speed is 200r / min, pressure cook at 100°C for 4 hours, filter after completion of pressure cooking;

[0060] (4) Wash the filter residue obtained in step (3) with deionized water for 3 times, then wash with ethanol once, and then dry at 120° C. for 4 hours to obtain a loose and uniform powder;

[0061]...

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Abstract

The invention discloses a method for separating and recovering cobalt from a chromium-containing waste hard alloy. The method comprises the following steps: taking the chromium-cobalt-tungsten-containing waste hard alloy; performing 800-900 DEG C high-temperature oxidation and ball milling on the waste hard alloy , and obtaining oxidized powder; carrying out alkali boiling on the oxidized powder, and filtering; washing and drying obtained filter residues to obtain powder; adding hydrogen peroxide into the obtained powder, adding alkali to adjust the pH value to 11 + / -0.5, stirring for 2-4 hours, and filtering; adding hydrochloric acid into the obtained filter residues for soaking until the filter residues are completely dissolved, and filtering; reacting the obtained filtrate with an oxalate / oxalic acid solution to generate cobalt oxalate precipitate, filtering and washing; and calcining the obtained cobalt oxalate into cobaltosic oxide powder, and carrying out reduction reaction to obtain cobalt powder. The recovery process is environmentally friendly, the technological process is short, equipment investment is low, energy consumption is low, operation is easy, implementation is easy, the recovery cost is low, the requirement for the cobalt content of the hard alloy is avoided, and the application range is wide.

Description

technical field [0001] The invention relates to the technical field of comprehensive recovery and reuse of valuable elements, in particular to a method for separating and recovering cobalt from chromium-containing waste hard alloys. Background technique [0002] The content of cobalt in the earth's crust is about 0.3wt%, mostly associated with nickel, copper, iron, lead, zinc and other minerals. The grade of cobalt ore is very low, and the grade of cobalt-containing pyrite is only 0.02% to 0.09%. Most of them are associated resources, and there are very few independent cobalt deposits. Facing the urgent demand for cobalt resources, the recovery of cobalt from cobalt-containing waste cemented carbide has become an important breakthrough to alleviate the shortage of cobalt raw materials. [0003] The existing methods for treating tungsten-cobalt-containing cemented carbide waste mainly include high-temperature oxidation, mechanical crushing, electrolysis, alkali leaching, sod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B34/36C22B1/02B22F9/22C22B23/00
CPCC22B7/008C22B7/001C22B1/02C22B7/006C22B34/36C22B23/0423B22F9/22C22B7/007Y02P10/20
Inventor 王云王权许伟瑜曾嘉豪朱刘童培云
Owner XIANDAO THIN FILM MATERIALS GUANGDONG CO LTD
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