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Purifying agent for purifying ammonium paratungstate and method for purifying ammonium paratungstate

A technology of ammonium paratungstate and purification agent, which is applied in chemical instruments and methods, inorganic chemistry, tungsten compounds, etc. It can solve the problems of poor purification effect of K and Na elements, achieve low cost, ensure recovery rate, and improve purification effect.

Active Publication Date: 2022-03-04
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved in the present invention is to overcome the defects in the prior art that the purification effect of K and Na elements in ammonium paratungstate is not good enough, thereby providing a kind of purification effect of K and Na elements, and a kind of purifying ammonium paratungstate with low cost. purifier
[0006] Another technical problem to be solved by the present invention is to overcome the defects in the prior art that the purification effect of K and Na elements in ammonium paratungstate is not good enough, so as to provide a kind of K and Na elements with good purification effect, simple operation and low cost. Method for purifying ammonium paratungstate

Method used

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  • Purifying agent for purifying ammonium paratungstate and method for purifying ammonium paratungstate

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Experimental program
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Embodiment 1

[0032] In this example, 4 kinds of ammonium paratungstate solids, A, B, C, and D, whose contents of K and Na elements exceed the standard are used for purification. According to GB / T 11064.4-1989, the contents of initial K and Na elements are respectively detected as follows: A ammonium paratungstate, K 17ppm , Na 623ppm; B ammonium paratungstate, K 36ppm, Na 1223ppm; C ammonium paratungstate, K 11ppm, Na 135ppm; D ammonium paratungstate, K 18ppm, Na365ppm.

[0033] The present embodiment provides a purging agent for purifying ammonium paratungstate, including free ammonia (NH 3 ) and ammonium chloride, of which free ammonia (NH 3 ) and ammonium chloride in a molar ratio of 1:2.

[0034] The present embodiment provides a kind of method for purifying ammonium paratungstate, comprising,

[0035] S1, add concentrated ammonia water and ammonium chloride solid respectively to water, prepare free ammonia (NH 3 ) concentration of 0.5mol / L, ammonium ion concentration of 1mol / L puri...

Embodiment 2

[0041] In this example, 4 kinds of ammonium paratungstate solids, A, B, C, and D, whose contents of K and Na elements exceed the standard are used for purification. According to GB / T 11064.4-1989, the contents of initial K and Na elements are respectively detected as follows: A ammonium paratungstate, K 17ppm , Na 623ppm; B ammonium paratungstate, K 36ppm, Na 1223ppm; C ammonium paratungstate, K 11ppm, Na 135ppm; D ammonium paratungstate, K 18ppm, Na365ppm.

[0042] The present embodiment provides a purging agent for purifying ammonium paratungstate, including free ammonia (NH 3 ) and ammonium bicarbonate, of which free ammonia (NH 3 ) and ammonium bicarbonate in a molar ratio of 2:1.

[0043] The present embodiment provides a kind of method for purifying ammonium paratungstate, comprising,

[0044] S1, add concentrated ammonia water and ammonium bicarbonate solid respectively to water, prepare free ammonia (NH 3 ) with a concentration of 1mol / L and an ammonium ion concentr...

Embodiment 3

[0050] In this example, 4 kinds of ammonium paratungstate solids, A, B, C, and D, whose contents of K and Na elements exceed the standard are used for purification. According to GB / T 11064.4-1989, the contents of initial K and Na elements are respectively detected as follows: A ammonium paratungstate, K 17ppm , Na 623ppm; B ammonium paratungstate, K 36ppm, Na 1223ppm; C ammonium paratungstate, K 11ppm, Na 135ppm; D ammonium paratungstate, K 18ppm, Na365ppm.

[0051] The present embodiment provides a purging agent for purifying ammonium paratungstate, including free ammonia (NH 3 ) and ammonium nitrate, of which free ammonia (NH 3 ) and ammonium nitrate in a molar ratio of 1:1.

[0052] The present embodiment provides a kind of method for purifying ammonium paratungstate, comprising,

[0053] S1, add concentrated ammonia water and ammonium nitrate solid respectively to water, prepare free ammonia (NH 3 ) with a concentration of 1mol / L and ammonium ion concentration of 1mol / L...

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Abstract

The invention provides a purifying agent for purifying ammonium paratungstate, which includes free ammonia and ammonium salt. The purifying agent has better purifying effect on K and Na elements in ammonium paratungstate. The present invention also provides a method for purifying ammonium paratungstate, comprising: S1, mixing ammonium paratungstate with the purifying agent to make a slurry; S2, heating the slurry to higher than room temperature; S3, heating the heated Filtrate the slurry, separate the filter residue and filtrate, wash the filter residue with water and dry to obtain purified ammonium paratungstate. Through the above method, the K and Na in the ammonium paratungstate solid can be better dissolved, and the ammonium paratungstate whose K and Na content exceed the standard A better purification effect is achieved, and the operation is simple and the cost is low.

Description

technical field [0001] The invention relates to the field of rare metal utilization, in particular to a purifying agent for purifying ammonium paratungstate and a method for purifying ammonium paratungstate. Background technique [0002] Ammonium paratungstate (APT) is an important precursor for producing tungsten powder. The main process for producing ammonium paratungstate is sodium hydroxide decomposition / sodium carbonate decomposition-ion exchange adsorption, purification, transformation / alkaline extraction purification, transformation / acid extraction purification, transformation- Copper salt selective precipitation purification molybdenum removal / special resin molybdenum removal-evaporation crystallization method. In recent years, tungsten mineral raw materials have become more and more complicated, and the process control of tungsten smelting to produce ammonium paratungstate has become more complicated, and the problem of K and Na being entrained in high-purity feed l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/00
CPCC01G41/00C01P2006/80
Inventor 黄万抚曾斌曾祥荣李新冬黄李金鸿胡运祯张天锡
Owner JIANGXI UNIV OF SCI & TECH