Method for treating hard alloy grinding material

A technology of cemented carbide and treatment method, which is applied in the field of waste cemented carbide treatment, can solve the problems of long nickel-cobalt leaching time, difficult separation of cobalt and tungsten, large consumption of oxidant, etc., and achieves shortened leaching time and low equipment requirements. , separate simple effects

Inactive Publication Date: 2015-04-08
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing technology has the problems of long leaching time of nickel and cobalt, large consumption of oxidant, high equipment requi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Proceed as follows:

[0023] a) Soda roasting: Mix the cemented carbide grinding material and sodium carbonate at a mass ratio of 1:1, the roasting temperature is 450°C, and the roasting time is 5 hours.

[0024] b) Alkali leaching: The roasted material is leached with a sodium hydroxide solution with [OH-] of 1.0 mol / l, the solid-to-liquid ratio of roasted material to liquid alkali is 1:3, the alkali leaching temperature is 85°C, and the alkali leaching time is 6 Hours, a solution containing sodium tungstate and a filter residue containing cobalt and nickel were obtained.

[0025] c) Cobalt-nickel leaching: The cobalt-nickel-containing filter residue is leached with sulfuric acid solution with [H+] of 1 mol / l, the solid-liquid ratio is 1:,5, the cobalt-nickel leaching time is 3 hours, and the cobalt-nickel leaching temperature is 85°C. The obtained cobalt-nickel-containing solution is used to recover the cobalt-nickel therein.

[0026] d) Recovery of tungsten: adding...

Embodiment 2

[0028] Proceed as follows:

[0029] a) Soda roasting: Mix the cemented carbide grinding material and sodium carbonate at a mass ratio of 1:2, the roasting temperature is 450°C, and the roasting time is 4 hours.

[0030] b) Alkali leaching: The roasted material is leached with a sodium hydroxide solution with [OH-] of 1.0 mol / l, the solid-to-liquid ratio of roasted material to liquid alkali is 1:4, the alkali leaching temperature is 80°C, and the alkali leaching time is 6 Hours, a solution containing sodium tungstate and a filter residue containing cobalt and nickel were obtained.

[0031] c) Cobalt-nickel leaching: The cobalt-nickel-containing filter residue is leached with [H+] of 1mol / l hydrochloric acid solution, the solid-liquid ratio is 1:,5, the cobalt-nickel leaching time is 2 hours, and the cobalt-nickel leaching temperature is 80°C. The obtained cobalt-nickel-containing solution is used to recover the cobalt-nickel therein.

[0032] d) Recovery of tungsten: adding h...

Embodiment 3

[0034] Proceed as follows:

[0035] a) Soda roasting: Mix the cemented carbide grinding material and sodium carbonate at a mass ratio of 1:2.5, the roasting temperature is 600°C, and the roasting time is 4 hours.

[0036] b) Alkali leaching: the roasted material is leached with [OH-] ammonia solution of 1.0 mol / l, the solid-to-liquid ratio of roasted material and liquid alkali is 1:4, the alkali leaching temperature is 80°C, and the alkali leaching time is 6 hours. A solution containing sodium tungstate and a filter residue containing cobalt and nickel are obtained.

[0037] c) Cobalt-nickel leaching: The cobalt-nickel-containing filter residue is leached with [H+] of 1mol / l hydrochloric acid solution, the solid-liquid ratio is 1:,5, the cobalt-nickel leaching time is 2 hours, and the cobalt-nickel leaching temperature is 80°C. The obtained cobalt-nickel-containing solution is used to recover the cobalt-nickel therein.

[0038] d) Recovery of tungsten: adding nitric acid to ...

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PUM

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Abstract

The invention relates to a method for treating a waste hard alloy and particularly relates to a method for treating a waste hard alloy grinding material, mainly solving the problems of long nickel-cobalt leaching time, high oxidizing agent consumption, high equipment requirement, long process, high separation difficulty of cobalt and tungsten which are contained in the waste hard alloy grinding material and low purity of an obtained tungsten product in the prior art. The method comprises the following steps of: (a) soda calcination: mixing tungsten carbide filter residues with sodium carbonate and sodium nitrate, and then calcining to obtain a material I; (b) caustic soda leaching: leaching the material I by using liquid caustic soda with [OH-] of 0.5-2.0 mol/l to obtain a sodium tungstate-containing solution and cobalt-nickel-containing filter residues; (c) cobalt-nickel leaching: leaching the cobalt-nickel filter residues by using an acid solution with [H+] of 0.5-2.0 mol/l to obtain a cobalt-nickel-containing solution used for cobalt-nickel recovery; (d) tungsten recovery: adding acid to the sodium tungstate-containing solution to regulate the pH value to 5.0-8.0 to obtain a high-purity tungstic acid precipitate, and washing, drying and calcining to obtain high-purity tungsten trioxide. The method disclosed by the invention can be used for well solving the problems and is worthy of being applied and popularized.

Description

technical field [0001] The invention relates to a treatment method for waste cemented carbide, in particular to a treatment method for waste cemented carbide grinding material. Background technique [0002] Cemented carbide is mainly composed of tungsten and cobalt. With the wide application and increasing demand of cemented carbide, the shortage of tungsten and cobalt resources has caused the price rise. In recent years, many countries regard cemented carbide waste as a valuable second resource to solve the source of raw materials and an important means to reduce the production cost of cemented carbide. Therefore, the recovery of tungsten and cobalt resources has great practical significance for the development of the national economy. [0003] At present, the main methods for processing cemented carbide residues at home and abroad are: sodium nitrate smelting method, zinc melting method, high temperature oxidation method, electrolysis method, etc. Patent 201310003314.2 p...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B23/00C22B34/36C22B1/02
CPCY02P10/20
Inventor 黄雪秋
Owner GUANGXI UNIV
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