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The method for preparing ammonium paratungstate

A technology of ammonium paratungstate and ammonium tungstate, applied in the field of preparation of ammonium paratungstate, can solve the problem of no relevant reports, and achieve the effect of shortening preparation time, less loss and high recovery rate

Active Publication Date: 2017-12-15
CHONGYI ZHANGYUAN TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although some scholars have studied the use of soluble tungstate, such as sodium tungstate, ammonium tungstate, adding inorganic acid to precipitate tungstic acid, but there is no relevant report on the filterability of tungstic acid

Method used

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  • The method for preparing ammonium paratungstate
  • The method for preparing ammonium paratungstate
  • The method for preparing ammonium paratungstate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Prepare tungstic acid by reacting diatomaceous earth, sodium tungstate and hydrochloric acid of different concentrations, and compare the concentration of hydrochloric acid on the filtration process of tungstic acid, as follows:

[0054] (1) Measure 50ml of concentrated hydrochloric acid, make hydrochloric acid with acidity of 2, 4, 6, and 8mol / l respectively, then add 2g of diatomaceous earth to each, and add 90°C to the water bath;

[0055] (2) Add 4 parts of 100ml sodium tungstate concentrate (the concentration of tungsten trioxide is 195g / l), coded as: A, B, C, D, where A is added to the pre-heated 2mol / l hydrochloric acid , B is added to the pre-heated 4mol / l hydrochloric acid, C is added to the pre-heated 6mol / l hydrochloric acid, D is added to the pre-heated 8mol / l hydrochloric acid, stirred, and the reaction time is 1h ;

[0056] (3) After the reaction is over, add cold pure water to the 4 groups of mixtures obtained in step (2), constant volume, filter, and re...

Embodiment 2

[0060] Prepare tungstic acid by reacting hydrochloric acid, sodium tungstate and diatomite of different weights, and compare the influence of the weight ratio of diatomite on the filtration process of tungstic acid, as follows:

[0061] (1) Measure 150ml of hydrochloric acid with an acidity of 4mol / l, add diatomaceous earth with a weight of 2, 4, 6, and 8g respectively, and add 90°C to the water bath;

[0062] (2) 4 parts of 100ml sodium tungstate concentrate (tungsten trioxide concentration is 195g / l), coded as: A, B, C, D, E, where A is added to the pre-heated hydrochloric acid solution, No diatomite was added to the solution, B was added to the hydrochloric acid solution in which 2g diatomite had been added in advance, C was added to the hydrochloric acid solution in which 4g diatomite had been added in advance, D was added to the hydrochloric acid solution in which 6g diatomite had been added in advance In the hydrochloric acid solution, E is added to the hydrochloric acid...

Embodiment 3

[0067] Prepare tungstic acid by reacting hydrochloric acid, diatomaceous earth and sodium tungstate solutions of different concentrations, and compare the influence of the concentration of sodium tungstate solution on the filtration process of tungstic acid, as follows:

[0068] (1) Measure four groups of 150ml hydrochloric acid with an acidity of 4mol / l, add 6g of diatomaceous earth, and add 90°C to the water bath;

[0069] (2) The tungsten trioxide concentration of the sodium tungstate solution is 312g / l, and sodium tungstate solutions with tungsten trioxide concentrations of 109, 218, 265, and 312g / l are prepared through this concentration. Add sodium tungstate solutions with tungsten trioxide concentrations of 109, 218, 265, and 312g / l, numbered: A, B, C, and D, respectively, into the pre-heated 4mol / l hydrochloric acid solution, and stir. The reaction time is 1h;

[0070] (3) After the reaction is over, add cold pure water to the 4 groups of mixtures obtained in step (2)...

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Abstract

The invention discloses an ammonium paratungstate preparation method. The method in the embodiment of the invention comprises the following steps: mixing a hydrochloric acid solution with diatomite, and heating the obtained mixture to obtain a diatomite-containing hydrochloric acid solution; adding a sodium tungstate solution to the diatomite-containing hydrochloric acid solution, and stirring the solutions to obtain a tungstic acid precipitate-containing mixed solution; carrying out primary filtering treatment on the tungstic acid precipitate-containing mixed solution to obtain a tungstic acid and diatomite mixture; mixing the tungstic acid and diatomite mixture with ammonia water to obtain a diatomite-containing ammonium tungstate solution; carrying out secondary filtering treatment on the diatomite-containing ammonium tungstate solution to obtain diatomite and an ammonium tungstate solution; and carrying out evaporating and crystallizing treatment on the ammonium tungstate solution to obtain ammonium paratungstate. The method effectively solves the problem of difficult filtration of viscous tungstic acid.

Description

technical field [0001] The invention relates to the field of tungsten ore smelting methods, in particular to a method for preparing ammonium paratungstate. Background technique [0002] The hydrometallurgy of tungsten is mainly divided into ion exchange process, extraction process, classical process and acid process. Among them, the mainstream processes are ion exchange process and extraction process. Both of these processes need to convert tungsten from sodium tungstate system to ammonium tungstate system, so that the required tungsten powder can be obtained by calcination into tungsten oxide and hydrogen reduction. However, the process of this method is complex and requires a large amount of water, resulting in a large amount of wastewater discharge and a large consumption of hydrochloric acid, which is likely to cause environmental pollution. [0003] From 1958 to 1990, our country used classic technology to produce ammonium paratungstate with black tungsten concentrate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/00
CPCC01G41/00
Inventor 黄泽辉邓登飞邓声华
Owner CHONGYI ZHANGYUAN TUNGSTEN