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Ammonium paratungstate and preparation method thereof

A technology of ammonium paratungstate and ammonium tungstate, applied in the field of ammonium paratungstate and its preparation, can solve the problems of low metal recovery rate, difficulty in finding insoluble compounds for leaching and separation, uncontrollable product quality, etc., and achieve the effect of short process flow

Active Publication Date: 2015-07-29
CHONGYI ZHANGYUAN TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These processes will use NaOH, NH 4 Cl or HCl, but Na + and Cl - Chemically active, it is difficult to find its insoluble compounds for leaching separation
Limited by the principle of the process, none of the four current processes can achieve zero discharge of wastewater
The pyrometallurgy has the advantages of short process, high degree of automation, and basically no waste water discharge, but has the following disadvantages: high energy consumption, low metal recovery rate, uncontrollable product quality, etc.

Method used

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  • Ammonium paratungstate and preparation method thereof
  • Ammonium paratungstate and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Using scheelite concentrate as raw material, the steps to prepare ammonium paratungstate are as follows:

[0051] (1) Take 100g of scheelite concentrate that has been ground, add 2 times the theoretical amount of ammonium phosphate, and mix;

[0052] (2) The mixed scheelite concentrate and ammonium phosphate were roasted for 1 hour at a reaction temperature of 830° C. to obtain a fired product, which was detected to be tungsten trioxide and calcium pyrophosphate;

[0053] (3) crushing the burnt product;

[0054] (4) dissolving the crushed product in ammonia water in a high-pressure decomposition kettle to obtain a crude ammonium tungstate solution, and the decomposition rate of tungsten trioxide reaches 98.9%;

[0055] (5) The crude ammonium tungstate solution is removed through processes such as sulfidation-precipitation to obtain pure ammonium tungstate solution;

[0056] (6) Evaporate and crystallize the pure ammonium tungstate solution after impurity removal to ob...

Embodiment 2

[0058] Using scheelite concentrate as raw material, the steps to prepare ammonium paratungstate are as follows:

[0059] (1) Take 100g of scheelite concentrate that has been ground, add 2.5 times the theoretical amount of red phosphorus, and mix;

[0060] (2) The mixed scheelite concentrate and ammonium phosphate were roasted for 1 hour at a reaction temperature of 800° C. to obtain a fired product, which was detected as tungsten trioxide and calcium pyrophosphate;

[0061] (3) Crushing the burnt material;

[0062] (4) dissolving the crushed product in ammonia water in a high-pressure decomposition kettle to obtain a crude ammonium tungstate solution, and the decomposition rate of tungsten trioxide reaches 98.6%;

[0063] (5) The crude ammonium tungstate solution is removed through processes such as sulfidation-precipitation to obtain pure ammonium tungstate solution;

[0064] (6) Evaporate and crystallize the pure ammonium tungstate solution after impurity removal to obtain...

Embodiment 3

[0066] Using scheelite concentrate as raw material, the steps to prepare ammonium paratungstate are as follows:

[0067] (1) Take 100g of scheelite concentrate that has been ground, add 2 times the theoretical amount of ammonium phosphate, and mix;

[0068] (2) The mixed scheelite concentrate and ammonium phosphate were roasted for 1 hour at a reaction temperature of 800° C. to obtain a fired product, which was detected to be tungsten trioxide and calcium pyrophosphate;

[0069] (3) crushing the burnt product;

[0070] (4) dissolving the broken product in ammonia water in a high-pressure decomposition kettle to obtain a crude ammonium tungstate solution, and the decomposition rate of tungsten trioxide reaches 99.1%;

[0071] (5) The crude ammonium tungstate solution is removed through processes such as sulfidation-precipitation to obtain pure ammonium tungstate solution;

[0072] (6) Evaporate and crystallize the pure ammonium tungstate solution after impurity removal to obt...

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Abstract

The invention discloses ammonium paratungstate and a preparation method thereof. The method for preparing the ammonium paratungstate comprises the following steps: grinding scheelite concentrates to prepare ore powder; adding a phosphorus-containing material into the ore powder and mixing; roasting the ore powder and the phosphorus-containing material which are mixed to obtain roasts containing tungsten trioxide; dissolving the roasts containing the tungsten trioxide by using ammonium hydroxide, and filtering to obtain an ammonium tungstate solution; evaporating and crystallizing the ammonium tungstate solution to prepare the ammonium paratungstate. By virtue of the adoption of the method, the ammonium paratungstate is efficiently and cleanly prepared; no wastewater is discharged.

Description

technical field [0001] The invention relates to the field of tungsten concentrate smelting, in particular to ammonium paratungstate and a preparation method thereof. Background technique [0002] The smelting of metal tungsten is the same as other metals, mainly including wet method and pyrometallurgy. At present, the most important smelting route is hydro-smelting, because the process of hydro-smelting is short, the production cycle is short, the production environment is good, and the product quality is relatively stable. The hydrometallurgy of tungsten is mainly divided into ion exchange process, extraction process, classical process and acid process. These processes will use NaOH, NH 4 Cl or HCl, but Na + and Cl - The chemical properties are lively, and it is difficult to find its insoluble compounds to achieve leaching and separation. Limited by the principle of the process, none of the four current processes can achieve zero discharge of wastewater. The pyrometal...

Claims

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Application Information

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IPC IPC(8): C01G41/00
Inventor 李红超黄泽辉邓登飞邓声华龚丹丹
Owner CHONGYI ZHANGYUAN TUNGSTEN
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