Method for treating ammonium paratungstate crystal crystallization mother liquor

A technology of crystallization mother liquor and ammonium paratungstate, which is applied in the post-production treatment of ammonium paratungstate and the treatment of ammonium paratungstate crystallization mother liquor, which can solve problems affecting product quality, achieve the effects of lowering temperature, increasing income, and simple process flow

Inactive Publication Date: 2018-08-24
CNMC GUANGXI PGMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Publication No. CN102910648A Invention Patent Ammonium Paratungstate crystallization mother liquor treatment method, the process uses the crystallization mother liquor to prepare the desorption liquid, and the impurities will be brought into the second stage liquid during ion column desorption, which will eventually affect the quality of the product

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  • Method for treating ammonium paratungstate crystal crystallization mother liquor

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Embodiment 1

[0024] A method for treating ammonium paratungstate crystallization mother liquor, comprising the following steps:

[0025] (1) Desulfurization treatment: put 3m 3 Pump the mother liquor of ammonium paratungstate crystallization into the stirring tank, add 5kg of hydrogen peroxide to the mother liquor, stir at 45r / min for 10min, and record it as material 1;

[0026] (2) Transformation reaction: adding alkali concentration in material 1 is the production recovery surplus alkali of 200g / L, wherein, the addition amount of production recovery surplus alkali is 0.288m 3 , the pH value of material 1 was adjusted to 11, stirred for 5 minutes at a speed of 45 r / min, and recorded as material 2;

[0027] (3) stripping reaction: the material 2 is pumped into the stripping tower to obtain ammonia gas and deamination solution;

[0028] (4) Spray: the ammonia in the step (3) is passed through the steam-water separator, sprayed with the mixed solution, the concentration prepared into ammon...

Embodiment 2

[0031] A method for treating ammonium paratungstate crystallization mother liquor, comprising the following steps:

[0032] (1) Desulfurization treatment: put 3m 3 Pump the mother liquor of ammonium paratungstate crystallization into the stirring tank, add 15kg of hydrogen peroxide to the mother liquor, stir at 90r / min for 30min, and record it as material 1;

[0033] (2) Transformation reaction: adding alkali concentration in material 1 is the production recovery surplus alkali of 350g / L, wherein, the addition amount of production recovery surplus alkali is 0.432m 3 , adjust the pH value of material 1 to 13, stir at 90r / min for 30min, and record it as material 2;

[0034] (3) stripping reaction: the material 2 is pumped into the stripping tower to obtain ammonia gas and deamination solution;

[0035] (4) Spray: the ammonia in the step (3) is passed through the steam-water separator, sprayed with the mixed solution, the concentration prepared into ammonium chloride is 270g / L,...

Embodiment 3

[0038] A method for treating ammonium paratungstate crystallization mother liquor, comprising the following steps:

[0039] (1) Desulfurization treatment: put 3m 3 Pump the mother liquor of ammonium paratungstate crystallization into the stirring tank, add 10kg of hydrogen peroxide into the mother liquor, stir at 65r / min for 10-30min, and record it as material 1;

[0040] (2) Conversion reaction: adding alkali concentration in material 1 is the production recovery residual alkali of 280g / L, wherein, the addition amount of production recovery residual alkali is 0.325m 3 , the pH value of material 1 was adjusted to 12, stirred at 65r / min for 15 minutes, and recorded as material 2;

[0041] (3) stripping reaction: the material 2 is pumped into the stripping tower to obtain ammonia gas and deamination solution;

[0042](4) Spray: the ammonia in the step (3) is passed through the steam-water separator, sprayed with the mixed solution, the concentration prepared into ammonium chlo...

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Abstract

The invention relates to the technical field of production of ammonium paratungstate, specifically to a method for production post-processing of ammonium paratungstate. More specifically, the invention relates to the method for treating an ammonium paratungstate crystal crystallization mother liquor. The method comprises the following steps: (1) desulfurization treatment; (2) a conversion reaction; (3) an air-stripping reaction; (4) spraying; and (5) preparation of an ammonium tungstate solution. The method provided by the invention has the advantages of simple process flow, easy operation andlow treatment cost, realizes zero discharge of a mother liquor, effectively utilizes excess alkali and four-stage liquids recovered from production, achieves considerable economic benefits, effectively removes impurities from the mother liquor, recovers tungsten in the mother liquor to a maximum extent, and improves profits.

Description

technical field [0001] The invention relates to the technical field of ammonium paratungstate production, in particular to a method for post-production ammonium paratungstate production. More specifically, it relates to a method for treating ammonium paratungstate crystallization mother liquor. Background technique [0002] At present, ammonium paratungstate is widely produced by alkali decomposition→ion exchange→evaporation crystallization process in my country. During the APT production process, about 5-15% of tungsten metal enters the crystallization mother liquor of ammonium paratungstate and various slag washing water. Since the chloride ion content in the crystallization mother liquor is relatively high, it cannot be directly returned to the main process, and an auxiliary process has to be set up to recover the tungsten trioxide in the crystallization mother liquor. In essence, the treatment process of APT crystallization mother liquor is the process of removing impur...

Claims

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Application Information

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IPC IPC(8): C01G41/00
CPCC01G41/003
Inventor 谢泉文
Owner CNMC GUANGXI PGMA
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