Hard alloy waste recovery method

A technology for recycling cemented carbide and waste materials, applied in the direction of improving process efficiency, etc., can solve the problems of high tungsten content in slag, large loss of raw and auxiliary materials, low recovery rate, etc., and achieve low chemical consumption, low decomposition cost, large The effect of promoting meaning

Active Publication Date: 2021-09-17
XIAMEN TUNGSTEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the treatment process of this method, the roasting equipment is severely constricted, the slag contains high tungsten, the recovery rate is low, and the cost of secondary slag treatment is high; and the subsequent production of APT through traditional metallurgical processes will generate a lot of waste water and consume a lot of raw and auxiliary materials.

Method used

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  • Hard alloy waste recovery method

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Effect test

Embodiment 1

[0033] A method for recycling cemented carbide scraps, comprising:

[0034] Step 1: Take 2Kg of cemented carbide waste (the mass content of tungsten oxide is 5%), and mix it with 0.36Kg calcium carbonate and 0.15Kg sodium silicate to obtain a mixture;

[0035] Step 2: Put the mixture obtained in Step 1 into a roasting furnace for roasting at a roasting temperature of 900°C and a roasting time of 1 hour;

[0036] Step 3: Soak the calcined material obtained in Step 2 in water. After water immersion, the feed liquid is filtered out by solid-liquid separation equipment to obtain sodium tungstate solution, and the recovery rate of tungsten is 98.18%.

Embodiment 2

[0038] A method for recycling cemented carbide scraps, comprising:

[0039] Step 1: Take 2.5Kg of cemented carbide waste (the mass content of tungsten oxide is 30%), and mix it with 1.12Kg of calcium oxide and 0.98Kg of sodium silicate glass to obtain a mixture;

[0040] Step 2: put the mixture obtained in step 1 into a roasting furnace for roasting, the roasting temperature is 800°C, and the roasting time is 16 hours;

[0041] Step 3: Soak the calcined material obtained in Step 2 in water. After water immersion, the feed liquid is filtered out by solid-liquid separation equipment to obtain sodium tungstate solution, and the recovery rate of tungsten is 98.32%.

Embodiment 3

[0043] A method for recycling cemented carbide scraps, comprising:

[0044] Step 1: Take 2Kg of cemented carbide waste (the mass content of tungsten oxide is 50%), and mix it with 0.95Kg calcium hydroxide and 1.05Kg sodium silicate to obtain a mixture;

[0045] Step 2: Put the mixture obtained in Step 1 into a roasting furnace for roasting, the roasting temperature is 1000°C, and the roasting time is 8 hours;

[0046] Step 3: Soak the calcined material obtained in Step 2 in water. After water immersion, the feed liquid is filtered out by solid-liquid separation equipment to obtain sodium tungstate solution, and the recovery rate of tungsten is 98.63%.

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Abstract

The invention relates to a hard alloy waste recovery method. Hard alloy waste contains elemental tungsten and/or tungsten carbide. The method comprises the following steps that 1, the hard alloy waste is mixed with sodium silicate and an additive to obtain a mixture, wherein the additive contains at least one of calcium element or magnesium element; 2, the mixture is roasted at the temperature of 400-1000 DEG C for 1-24 h, a roasted material is obtained, and in the roasting process, the elemental tungsten and/or the tungsten carbide in the hard alloy waste, the sodium silicate and the additive react under the high-temperature condition to generate sodium tungstate and calcium silicate and/or magnesium silicate; and 3, the roasted material is subjected to water leaching, a solid-liquid mixture is obtained, filter residues are removed after solid-liquid separation, and a sodium tungstate solution is obtained. The method is simple to operate, low in input cost, low in reagent consumption, low in decomposition cost, free of the problem of a roasting furnace bonding at the same time, high in tungsten recovery rate, suitable for industrial production and great in popularization significance.

Description

technical field [0001] The invention relates to solid waste recovery technology, in particular to a method for recovery of cemented carbide waste. Background technique [0002] Cemented carbide is an alloy material made of hard compounds of refractory metals and bonding metals through powder metallurgy. Floor materials, dust collection materials, grinding materials and waste materials produced in the production process of cemented carbide or floor materials, dust collection materials, grinding materials and waste materials produced in the production process of tungsten powder and tungsten carbide powder, referred to as Carbide scrap. Tungsten carbide and elemental tungsten are widely used in the preparation of cemented carbide. The produced cemented carbide waste mainly contains tungsten carbide and elemental tungsten. Recycling these cemented carbide wastes is conducive to the full utilization of resources and solves waste accumulation and pollution. question. [0003] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B7/00C22B34/36
CPCC22B1/02C22B7/006C22B34/36Y02P10/20
Inventor 方奇岳庆光黄建华陈志刚胡庆民王海军王世良
Owner XIAMEN TUNGSTEN
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