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Preparation process for ammonium paratungstate

An ammonium paratungstate and preparation process technology, applied in the field of chemistry, can solve the problems of high product quality and reaction energy consumption, low purity of ammonium paratungstate, and many impurities in ammonium paratungstate, and achieve the effects of easy reaction, reduced production energy consumption and low reaction conditions.

Active Publication Date: 2018-12-18
江西省修水赣北钨业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned patents have the limitations of low purity and high reaction conditions in the preparation of ammonium paratungstate, which will cause more impurities in ammonium paratungstate to affect product quality and consume too much energy for the reaction.

Method used

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  • Preparation process for ammonium paratungstate

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Effect test

Embodiment 1

[0021] A kind of preparation technology of ammonium paratungstate, its technological process comprises:

[0022] (1) Preparation of sodium tungstate: use tungsten trioxide as the anode electrode, and graphene-modified carbon rod as the cathode electrode to catalyze the preparation of sodium tungstate into sodium tungstate. The specific process is as follows:

[0023] a Removal of impurities: Grind the raw tungsten block to 2400 mesh, put it in the mixing bucket and add concentrated H2SO4 gradient stirring. The gradient stirring procedure includes ordinary stirring at a speed of 800r / min for 8 minutes, and medium speed stirring at a speed of 1200r / min Stir for 15 minutes, stir at a high speed of 2000r / min for 10 minutes, use tungsten trioxide as the anode electrode, and use graphene-modified carbon rods as the cathode electrode to energize and catalyze the reaction, let it stand for 80 minutes, filter out dissolved impurities, and prepare the tungstic acid solution spare;

[0...

Embodiment 2

[0034] A kind of preparation technology of ammonium paratungstate, its technological process comprises:

[0035] (1) Preparation of sodium tungstate: use tungsten trioxide as the anode electrode, and graphene-modified carbon rod as the cathode electrode to catalyze the preparation of sodium tungstate into sodium tungstate. The specific process is as follows:

[0036] a Removal of impurities: Grind the raw tungsten block to 2400 mesh, put it in the mixing bucket and add concentrated H2SO4 gradient stirring. The gradient stirring procedure includes ordinary stirring at a speed of 800r / min for 8 minutes, and medium speed stirring at a speed of 1200r / min Stir for 15 minutes, stir at a high speed of 2000r / min for 10 minutes, use tungsten trioxide as the anode electrode, and use graphene-modified carbon rods as the cathode electrode to energize and catalyze the reaction, let it stand for 80 minutes, filter out dissolved impurities, and prepare the tungstic acid solution spare;

[0...

Embodiment 3

[0047] A kind of preparation technology of ammonium paratungstate, its technological process comprises:

[0048] (1) Preparation of sodium tungstate: use tungsten trioxide as the anode electrode, and graphene-modified carbon rod as the cathode electrode to catalyze the preparation of sodium tungstate into sodium tungstate. The specific process is as follows:

[0049] a Removal of impurities: Grind the raw tungsten block to 2400 mesh, put it in the mixing bucket and add concentrated H2SO4 gradient stirring. The gradient stirring procedure includes ordinary stirring at a speed of 800r / min for 8 minutes, and medium speed stirring at a speed of 1200r / min Stir for 15 minutes, stir at a high speed of 2000r / min for 10 minutes, use tungsten trioxide as the anode electrode, and use graphene-modified carbon rods as the cathode electrode to energize and catalyze the reaction, let it stand for 80 minutes, filter out dissolved impurities, and prepare the tungstic acid solution spare;

[0...

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Abstract

The invention discloses a preparation process for ammonium paratungstate. The preparation process comprises preparation of sodium tungstate, preparation of sodium tungstate ammonium, decomposition, washing and impurity-removal, and purifying and re-crystallization. The process adopts an electro-catalysis way to prepare an intermediate product sodium tungstate, so that the reaction conditions are reduced, reaction is easier, and production energy consumption is reduced; and ammonium paratungstate is subjected to impurity-removal and purification through a cleaning, re-crystallizing and purifying way, so that purity of ammonium paratungstate prepared in the process is relatively high.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a preparation process of ammonium paratungstate. Background technique [0002] Ammonium paratungstate is a kind of chemical substance, mainly white crystal, there are two kinds of flakes or needles, used to make metal tungsten powder made of tungsten trioxide or blue tungsten oxide. It is also used to manufacture ammonium metatungstate and other tungsten compounds, which are used as additives in the petrochemical industry. [0003] CN200880003920.1 The present invention discloses a method for producing ammonium paratungstate tetrahydrate by heat-treating ammonium paratungstate decahydrate in aqueous suspension. Ammonium paratungstate tetrahydrate can be prepared with high purity and high yield. The production method can also be carried out in a simple and energy-saving manner. [0004] CN201210529185.6 The present invention discloses a preparation method of ammonium paratungstate, com...

Claims

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Application Information

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IPC IPC(8): C01G41/00
CPCC01G41/00C01P2006/80
Inventor 丁伟邹元焘王松林郭荣金冯志文
Owner 江西省修水赣北钨业有限公司
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