Process for recycling ammonium tungstate from ammonium paratungstate crystallization mother liquor

A crystallization mother liquor, ammonium paratungstate technology, applied in the direction of tungsten compounds, inorganic chemistry, chemical instruments and methods, etc., can solve the problems of high consumption of auxiliary materials, high production cost, high energy consumption, etc., and achieve short process flow and low production cost Effect

Inactive Publication Date: 2016-01-13
王晓伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to the main purpose of the present invention is to provide a process for recovering ammonium tungstate from the ammonium paratungstate crystallization mother liquor in view of the problems of ammonium paratungstate crystallization mother liquor recovery of ammonium tungstate supplementary material consumption, high production cost, and large energy consumption in the above-mentioned prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of ammonium paratungstate crystallization mother liquor reclaims ammonium tungstate process, comprises the steps:

[0025] Step (1): Generate ammonium dodecatungtophosphate precipitate

[0026] Add phosphoric acid with a theoretical amount of 280% to the crystallization mother liquor, stir evenly and let it stand for 35 minutes, then add hydrochloric acid under stirring conditions to make the pH value ≤ 0.5, and obtain dodecatungstate ammonium phosphate precipitation;

[0027] Step (2): Ammonium Tungstophosphate Precipitation Ammonia Dissolution

[0028] Add ammonia water with a mass concentration of 25% into the dissolving tank, heat the temperature to 45°C, and add the ammonium dodecungungtophosphate precipitate obtained in step (1) under stirring conditions, so that the ammonium tungstate solution after the ammonia-dissolved ammonium dodekatungstate precipitates Proportion is at 1.38g / l, and the add-on of described ammoniacal liquor should make the free ammon...

Embodiment 2

[0039] A kind of ammonium paratungstate crystallization mother liquor reclaims ammonium tungstate process, comprises the steps:

[0040] Step (1): Generate ammonium dodecatungtophosphate precipitate

[0041] Add phosphoric acid with a theoretical amount of 280% to the crystallization mother liquor, stir evenly and let it stand for 35 minutes, then add hydrochloric acid under stirring conditions to make the pH value ≤ 0.5, and obtain dodecatungstate ammonium phosphate precipitation;

[0042] Step (2): Ammonium Tungstophosphate Precipitation Ammonia Dissolution

[0043] Add ammonia water with a mass concentration of 22% into the dissolving tank, heat the temperature to 55°C, and add the ammonium dodecungungtophosphate precipitate obtained in step (1) under stirring conditions, so that the ammonium tungstate solution after the ammonia-dissolved ammonium dodekatungstate precipitates Proportion is at 1.36g / l, and the add-on of described ammoniacal liquor should make the free ammon...

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Abstract

The invention belongs to the technical field of producing ammonium paratungstate (APT) through tungsten hydrometallurgy, and particularly relates to a novel process for recycling ammonium tungstate from ammonium paratungstate crystallization mother liquor. The process comprises the steps that 1, 12-ammonium tungstophosphate sediment is generated; 2, ammonia neutralization is carried out on the 12-ammonium tungstophosphate sediment; 3, a solution prepared in the step 2 enters a molybdenum removing tank for molybdenum removal after being subjected to impurity removal, and an ammonium tungstate solution is obtained through recycling. The ammonium tungstate solution recycled through the process can be directly subjected to evaporative crystallization to obtain APT-0-grade products, the process procedure is short, and the production capacity of main process equipment is not occupied. The characteristics that 12-ammonium tungstophosphate is low in solubility under the acidic condition and high in reaction speed at low temperature are utilized, the proper pH value range is obtained through hydrochloric acid adjustment, meanwhile, the dosage of phosphoric acid is screened, the 12-ammonium tungstophosphate sediment can be obtained at low temperature, the ammonium tungstate solution is obtained through ammonia neutralization, impurity removal and molybdenum removal, and production cost is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of producing ammonium paratungstate (APT) by tungsten hydrometallurgy, and in particular relates to a new process for recovering ammonium tungstate from ammonium paratungstate crystallization mother liquor. Background technique [0002] my country is the country with the most abundant tungsten reserves in the world. According to the data released by the U.S. Geological Survey in 2006, my country has 1.8 million tons of tungsten reserves, accounting for 61% of the world, of which scheelite is about 70% and wolframite is about 30%. The main technologies of tungsten hydrometallurgy in my country are: acid decomposition of scheelite, alkali pressure cooking-extraction, alkali pressure cooking-ion exchange. Among them, ammonium paratungstate is an important intermediate product in the tungsten smelting process. The classic ammonium paratungstate production process mainly includes ore decomposition, transformati...

Claims

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Application Information

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IPC IPC(8): C01G41/00
CPCC01G41/00
Inventor王晓伟
Owner王晓伟