Method for preparing ammonium paratungstate by ion exchange method

A technology for preparing ammonium paratungstate and ion exchange method is applied in the field of preparing ammonium paratungstate by ion exchange method, which can solve the problems of low processing capacity of strong basic resin, large amount of waste water and large volume of processing solution.

Active Publication Date: 2014-07-30
CHONGYI ZHANGYUAN TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This consumes a lot of water resources and makes the treatment solution volume large
A large amount of water needs to be transported during production, which consumes a lot of energy and power
[0006] (2) The unit processing capacity of strong basic resin is not high, and the working exchange capacity of resin is small
[0007] (3) The amount of wastewater is large and difficult to handle
This method has achieved certain research results, but there are also technical difficulties, such as the need to consume a large amount of acid to adjust the pH to below 7, and APT is precipitated during the ammonia desorption process, and the desorption is not complete.

Method used

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  • Method for preparing ammonium paratungstate by ion exchange method
  • Method for preparing ammonium paratungstate by ion exchange method
  • Method for preparing ammonium paratungstate by ion exchange method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] refer to figure 2 , take 200ml of concentrated sodium tungstate feed solution obtained by alkali decomposition of tungsten concentrate (WO 3 Concentration greater than 100g / L), add 30g of tungsten oxide waste under stirring conditions, heat and boil for neutralization, and filter when the pH reaches 8-9. Dilute the neutralized feed solution to a pre-delivery solution with a tungsten trioxide concentration of about 60g / L. At a linear speed of 2 cm / min, the pre-exchange solution was passed through an ion exchange column filled with 100 g of 312 resin for adsorption exchange until leakage. Use concentrated ammonia water for desorption, and control the desorption rate to 1cm / min. The desorption liquid with higher concentration of tungsten in the front section (the desorption liquid collected before the Baume degree drops to 13Be) is 150ml of desorption peak liquid, and the desorption liquid with lower tungsten concentration in the later stage (the desorption liquid colle...

Embodiment 2

[0065] refer to figure 2 , take 500ml of concentrated sodium tungstate feed solution obtained by alkali decomposition of tungsten concentrate (WO 3 Concentration greater than 100g / L), add 175g of crude tungstic acid under stirring conditions, heat and boil for neutralization, and filter when the pH reaches 8-9. Dilute the neutralized feed solution to a pre-delivery solution with a tungsten trioxide concentration of about 60g / L. At a linear speed of 2 cm / min, the pre-exchange solution was passed through an ion-exchange column equipped with 200 g of 640 resin for adsorption and exchange until leakage. Use ammonium chloride + ammonia water (Cl ion concentration 150-160g / L, ammonia water 2.5mol / L) for desorption, and control the desorption rate to 1cm / min. The desorption solution with higher concentration of tungsten in the front section (the desorption solution collected before the Baume degree drops to 13Be) is 289ml of desorption peak solution, and the desorption solution wi...

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Abstract

The invention discloses a method for preparing ammonium paratungstate by an ion exchange method. The method includes the steps: (1) carrying out alkali treatment of a tungsten concentrate, so as to obtain an alkaline sodium tungstate material solution; (2) adding an acidic substance into the alkaline sodium tungstate material solution, heating, and carrying out neutralization treatment, so as to obtain a sodium tungstate material solution; (3) diluting the sodium tungstate material solution, so as to obtain a solution before ion exchange; (4) carrying out adsorption treatment of the solution before ion exchange by a weakly alkaline anion exchange resin, so as to allow tungsten in the solution before ion exchange to be adsorbed by the weakly alkaline anion exchange resin; (5) carrying out desorption treatment of the weakly alkaline anion exchange resin adsorbed with tungsten by using a desorption agent, so as to obtain a desorption solution; (6) carrying out impurity-removal treatment of the desorption solution, so as to obtained a solution after impurity removal; and (7) carrying out evaporation crystallization treatment of the solution after impurity removal, so as to obtain ammonium paratungstate. With use of the method, the concentration of tungsten trioxide in the solution before ion exchange can be significantly improved, generation of wastewater is reduced, and the qualified APT is prepared.

Description

technical field [0001] The invention belongs to the field of tungsten metallurgy, in particular, the invention relates to a method for preparing ammonium paratungstate by an ion exchange method. Background technique [0002] Tungsten has the characteristics of high melting point, high density and high hardness. It is widely used in the fields of electric power, metallurgy, machining and aerospace, and is an important strategic reserve metal. China is the main supplier of tungsten in the world, and its resource reserves rank first in the world. my country's tungsten smelting technology has become mature, among which the tungsten smelting ion exchange process is a smelting technology proposed and developed by Chinese scientific and technological workers. The promotion of ion exchange technology in tungsten smelting has greatly improved the overall level of tungsten smelting in my country, and the product quality has risen to a higher level. [0003] As a unique separation te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00
Inventor 黄泽辉邓声华李红超邓登飞龚丹丹
Owner CHONGYI ZHANGYUAN TUNGSTEN
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