Method for preparing sodium tungstate solution from tungsten-containing waste in short process

A technology of tungsten waste and sodium tungstate, applied in the preparation of tungsten compounds, chemical instruments and methods, tungsten compounds, etc., can solve the problems of long process flow and high production cost

Pending Publication Date: 2021-09-14
CHONGYI ZHANGYUAN TUNGSTEN +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method uses sodium carbonate, sodium hydroxide and sodium percarbonate as roasting additives, it is also possible to prepare sodium tungstate solution from tungsten-containing waste materials; but the first step of the process includes carrying out a granulation pretreatment process on tungsten-containing waste materials, and There are requirements for the particle size of granular tungsten-containing waste, and additional sodium percarbonate reagent is required as an oxidant in the roasting process, which presents the technical characteristics of long process flow and high production cost

Method used

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  • Method for preparing sodium tungstate solution from tungsten-containing waste in short process
  • Method for preparing sodium tungstate solution from tungsten-containing waste in short process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: produce sodium tungstate solution with tungsten-containing waste material, the steps are as follows:

[0038] Step 1: Take 30g of massive tungsten-containing waste, add sodium hydroxide with a mass ratio of 2 times to the tungsten-containing waste, and mix evenly to obtain a mixture; roast the mixture at a roasting temperature of 900°C for 1 hour to obtain a roasted material ;

[0039] Step 2: After the roasted material is lowered to room temperature, add water with a weight ratio of 6:1 to the roasted material and soak for 3 hours to obtain a slurry, stir the slurry for 1 hour of water immersion, the water immersion temperature is 60 ° C, water Filtration after leaching to obtain filter residue and leachate;

[0040] Step 3: Add hydrochloric acid to the leaching solution obtained in step 2 to adjust the pH value of the leaching solution to 10, stir, heat to 80°C and keep it warm for 10 minutes, and filter to obtain a sodium tungstate solution. The recov...

Embodiment 2

[0041] Embodiment 2: produce sodium tungstate solution with tungsten-containing waste material, the steps are as follows:

[0042] Step 1: Take 40g of powdery tungsten-containing waste, add sodium bicarbonate with a mass ratio of 1.5 times to the tungsten-containing waste, and mix well to obtain a mixture; roast the mixture at a temperature of 600°C for 2 hours to obtain a roasted material ;

[0043] Step 2: After the roasted material is lowered to room temperature, add water with a weight ratio of 4:1 to the roasted material and soak for 4 hours to obtain a slurry, stir the slurry for 1 hour of water immersion, the water immersion temperature is 80 ° C, water Filtration after leaching to obtain filter residue and leachate;

[0044] Step 3: Add sulfuric acid to the leaching solution obtained in Step 2 to adjust the pH value of the leaching solution to 9, stir, heat to 90° C. and keep it warm for 20 minutes, and filter to obtain a sodium tungstate solution. The recovery rate ...

Embodiment 3

[0045] Embodiment 3: produce sodium tungstate solution with tungsten-containing waste material, the steps are as follows:

[0046] Step 1: Take 50g of powdery tungsten-containing waste material, add sodium carbonate with a mass ratio of 2 times to the tungsten-containing waste material, and mix evenly to obtain a mixture; roast the mixture at a roasting temperature of 800°C for 1 hour to obtain a roasted material;

[0047] Step 2: After the roasted material is lowered to room temperature, add water with a weight ratio of 2:1 to the roasted material and soak for 6 hours to obtain a slurry, stir the slurry for 2 hours of water immersion, the water immersion temperature is 60°C, and water Filtration after leaching to obtain filter residue and leachate;

[0048] Step 3: Add phosphoric acid to the leaching solution obtained in Step 2 to adjust the pH value of the leaching solution to 11, stir, heat to 95° C. and keep it warm for 20 minutes, and filter to obtain a sodium tungstate s...

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Abstract

The invention relates to a method for preparing a sodium tungstate solution from tungsten-containing waste by using an alkali melting roasting-water leaching method, the method comprises the following steps: S1, directly and uniformly mixing the tungsten-containing waste with alkali, and then roasting to obtain a roasted product; s2, performing water leaching on the roasted material, obtaining a solid-liquid mixture, filtering the solid-liquid mixture, and obtaining filter residues and leachate; and S3, adjusting the pH value of the leachate to 9-11 to obtain mixed slurry, and filtering to obtain thesodium tungstate solution. The sodium tungstate solution can be directly subjected to evaporative crystallization to obtain a sodium tungstate product, and can also be subjected to an ion exchange process or an extraction process to obtain the ammonium tungstate solution, and the ammonium tungstate solution is subjected to evaporative crystallization to obtain an APT product. The method is suitable for recovery treatment of various tungsten-containing waste materials, and the tungsten-containing waste material treatment method is short in technological process and high in metal recovery rate, is a green and efficient treatment method, and has great popularization and application values.

Description

technical field [0001] The invention relates to a method for producing sodium tungstate solution by using tungsten-containing waste materials, which is a new technology for treating tungsten-containing waste materials with a short flow process, and belongs to the field of industrial solid waste treatment. Background technique [0002] The development of modern industry has gradually increased the amount of scrapped cemented carbide known as "industrial teeth". With the depletion of strategic primary tungsten ore resources, how to comprehensively recover valuable metals from tungsten-containing waste secondary resources has become a research topic that has attracted much attention at home and abroad. According to literature reports: China's annual consumption of metal tungsten is about 27,000 tons, and cemented carbide accounts for more than 50% of tungsten application products. According to physical specifications, tungsten-containing waste mainly falls into two categories:...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00
CPCC01G41/00C01G41/003
Inventor 贺山明徐国钻陈邦明梁勇潘界昌羊求民
Owner CHONGYI ZHANGYUAN TUNGSTEN
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