Waste hard alloy grinding material recovery treatment method

A cemented carbide and recovery treatment technology, applied in the direction of improving process efficiency, etc., can solve the problems of difficult separation of cobalt and tungsten, high equipment requirements, low recovery rate, etc., and achieve low cost, low equipment requirements, and high recovery rate Effect

Active Publication Date: 2014-07-09
SINOPEC SHANGHAI ENG +1
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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 a long process, high equipment requirements, difficult separation of cobalt and tungsten in the grinding material, and low recovery rate. A new recycling process for waste cemented carbide grinding material is provided. method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Proceed as follows:

[0022] a) Oxidative acid dissolution. Add 10Kg of grinding material to 2mol / l sulfuric acid solution according to the solid-to-liquid ratio of 1:3, and at the same time add the oxidant sodium chlorate according to 0.2 times the total weight of cobalt-nickel-iron, and the reaction time is 2 hours. The reaction temperature is 90°C. The cobalt content in the final filter residue is 0.2%, the nickel content is 0.15%, and the iron content is 0.03%. The leaching rates of cobalt, nickel and iron are 96%, 97%, and 95% respectively.

[0023] b) Soda roasted tungsten carbide slag. After acid-dissolving and filtering, the tungsten carbide filter residue obtained is 8.2kg, mixed with soda (sodium carbonate) according to the molar ratio of 1:1.3, and sodium nitrate is added according to the molar ratio of tungsten carbide and sodium nitrate of 1:0.1, and mixed evenly in the rotary kiln Roasting, the calcining temperature is 430 DEG C, and the time is 2 hours...

Embodiment 2

[0027] Proceed as follows:

[0028] a) Oxidative acid dissolution. Add 10Kg of grinding material to 2mol / l sulfuric acid solution according to the solid-to-liquid ratio of 1:4, and at the same time add the oxidant sodium chlorate according to 0.25 times the total mass of cobalt-nickel-iron, and the reaction time is 2 hours. The reaction temperature is 90°C. The cobalt content in the final filter residue is 0.3%, the nickel content is 0.12%, and the iron content is 0.1%. The leaching rates of cobalt, nickel and iron are 96.5%, 97.8%, and 96%, respectively.

[0029] b) Soda roasted tungsten carbide slag. After acid-dissolving and filtering, the tungsten carbide filter residue obtained is 8.6kg, mixed with soda (sodium carbonate) in a molar ratio of 1:14, and sodium nitrate is added in a molar ratio of tungsten carbide to sodium nitrate in a ratio of 1:0.15, and mixed evenly in a rotary kiln Roasting, the calcining temperature is 450 DEG C, and the time is 2 hours.

[0030] c...

Embodiment 3

[0033] Proceed as follows:

[0034]a) Oxidative acid dissolution. Add 10Kg of grinding material to 2.5mol / l sulfuric acid solution according to the solid-to-liquid ratio of 1:3.5, and at the same time add the oxidant sodium chlorate according to 0.2 times the total mass of cobalt-nickel-iron, and the reaction time is 2 hours. The reaction temperature is 90°C. The cobalt content in the final filter residue is 0.15%, the nickel content is 0.12%, and the iron content is 0.04%. The leaching rates of cobalt, nickel and iron are 96.5%, 97.5%, and 95%, respectively.

[0035] b) Soda roasted tungsten carbide slag. After acid-dissolving and filtering, the tungsten carbide filter residue obtained is 8.2kg, mixed with soda (sodium carbonate) according to the molar ratio of 1:1.3, and sodium nitrate is added according to the molar ratio of tungsten carbide and sodium nitrate of 1:0.2, and mixed evenly, then put in the rotary kiln Roasting, the calcining temperature is 450 DEG C, and th...

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Abstract

The invention relates to a waste hard alloy grinding material recovery treatment method, wherein problems of low process, high equipment requirements, high cobalt-tungsten separation difficulty in a grinding material, and low recovery rate in the existing technology are mainly solved. The technical scheme of the waste hard alloy grinding material recovery treatment method comprises: a) mixing a waste hard alloy grinding material, a sulfuric acid solution and an oxidant I, carrying out a reaction, and filtering to obtain tungsten carbide filter residue and a cobalt-nickel-iron-containing solution; b) mixing the tungsten carbide filter residue, sodium carbonate and sodium nitrate, and calcining to obtain a material I; c) immersing the material I in hot water to obtain a solution containing sodium tungstate, and carrying out concentration evaporation crystallization on the solution containing sodium tungstate to obtain a sodium tungstate crystal; and d) adding an oxidant II to the cobalt-nickel-iron-containing solution under a condition of the pH value of 2-5, carrying out a reaction to obtain iron precipitate and a nickel-cobalt-containing solution, and treating the nickel-cobalt-containing solution to obtain a cobalt-nickel salt crystal. According to the present invention, with the technical scheme, the problems in the prior art are well solved, and the method can be used for the waste hard alloy grinding material recovery treatment in the industrial production.

Description

technical field [0001] The invention relates to a recycling and processing method of waste cemented carbide grinding materials. 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: saltpeter smelting method, zinc melting method, oxidation method, sodium sulfate dissolution method and electrolysis method. Document CN88105175.6 discloses a method for regenerating met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B23/00C22B34/36
CPCY02P10/20
Inventor 杜军
Owner SINOPEC SHANGHAI ENG
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