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Method for processing crude ammonium tungstate solution

An ammonium tungstate and copper sulfate solution technology, applied in chemical instruments and methods, tungsten compounds, inorganic chemistry, etc., can solve the problems of small tungsten loss, high product purity, and no explanation of filtration treatment.

Active Publication Date: 2016-06-29
CHONGYI ZHANGYUAN TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only has good impurity removal effect, high product purity, small tungsten loss, but also can remove various impurities, and has short process, simple equipment, easy implementation and low cost, but this patent does not explain how to filter the precipitated substances, Production practice found that this is also a problem that needs to be solved
[0004] Therefore, the current method of treating ammonium tungstate solution needs to be further studied

Method used

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  • Method for processing crude ammonium tungstate solution
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specific Embodiment

[0021] For this reason, according to one aspect of the present invention, the present invention proposes a kind of method of processing crude ammonium tungstate solution. According to a specific embodiment of the present invention, the method may specifically include:

[0022] (1) Wash the activated carbon powder with dilute hydrochloric acid;

[0023] (2) Add copper sulfate solution, ammonium sulfide solution and washed activated carbon powder to the crude ammonium tungstate solution to purify the crude ammonium tungstate solution;

[0024] (3) Filter the purified ammonium tungstate solution to obtain filter residue containing activated carbon powder and pure ammonium tungstate solution; and

[0025] (4) Evaporate and crystallize the pure ammonium tungstate solution to obtain ammonium paratungstate.

[0026] The method for processing the thick ammonium tungstate solution according to the embodiments of the present invention is by adding activated carbon powder in the thick ...

Embodiment 1

[0049] The activated carbon powder was washed with dilute hydrochloric acid, and the physical properties of the washed activated carbon powder are shown in Table 1.

[0050] Table 1

[0051] Activated carbon powder particle size

Subblue decolorization (ml / 0.1)

Iodine adsorption value (mg / g)

PH value

325 mesh (46 micron)

13

1104

10.5

[0052] refer to figure 2 , add ammonium sulfide solution (in S 2+ Calculated, the concentration is 80g / l) 0.98ml, copper sulfate solution (200g / l) 0.12ml and washed activated carbon powder 8g, stirred for 20 minutes, and filtered with a suction filtration device. The filtrate was evaporated and crystallized, and the pH at the end point was 6.7. The test results are shown in Table 2.

[0053] Table 2

[0054] K

Na

P

S

Al

As

Bi

Ca

Cd

co

Cr

Cu

4

3

<5

<5

<4

<8

<1

<5

<1

<4

<4

1

Fe

Mg

mn

M...

Embodiment 2

[0058] The activated carbon powder was washed with dilute hydrochloric acid, and the physical properties of the washed activated carbon powder are shown in Table 1.

[0059] refer to figure 2 , add ammonium sulfide solution (in S 2+ Calculated, the concentration is 80g / l) 0.98ml, copper sulfate solution (200g / l) 0.12ml and washed activated carbon powder 15g, stirred for 20 minutes, and filtered with a suction filtration device. The filtrate was evaporated and crystallized, and the pH at the end point was 6.7. The test results are shown in Table 3.

[0060] table 3

[0061] K

Na

P

S

Al

As

Bi

Ca

Cd

co

Cr

Cu

8

6

<5

<5

<4

<8

<1

<5

<1

<4

<4

1

Fe

Mg

mn

Mo

Ni

Pb

Sb

Si

sn

Ti

V

<5

<3

<5

5

<3

<1

<5

<5

<1

<4

<4

[0062] The filter residue containing activated carbon powder is washed to o...

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Abstract

The invention discloses a method for treating a crude ammonium tungstate solution. The method comprises the steps of (1) washing activated carbon powder by utilizing dilute hydrochloric acid; (2) adding an ammonium sulfide solution, a copper sulfate solution and the washed activated carbon powder into the crude ammonium tungstate solution to carry out purification treatment on the crude ammonium tungstate solution; (3) filtering the purified crude ammonium tungstate solution to obtain filter residue containing the activated carbon powder and a pure ammonium tungstate solution; and (4) carrying out evaporation crystallization on the pure ammonium tungstate solution to obtain ammonium paratungstate. By utilizing the method, a lot of sedimentation time and filtering equipment can be saved, the treatment efficiency can be significantly improved, and the treatment cost can be reduced.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular, the invention relates to a method for processing crude ammonium tungstate solution. Background technique [0002] In tungsten smelting, molybdenum has a great influence on the performance of subsequent products, and tungsten and molybdenum are elements of the same subgroup, with similar properties and difficult to remove. How to remove molybdenum in tungsten smelting has always been a difficult and important problem. [0003] CN101177303A discloses a method for removing molybdenum, arsenic, antimony, and tin by precipitation from tungstate solution, by adding a precipitating agent in the tungstate solution containing molybdenum, arsenic, antimony, and tin after sulfidation, so that the above impurities Thio salts are combined to form insoluble compounds to precipitate, while tungsten compounds remain in solution, thereby obtaining a pure tungstate solution. This method not only h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/00
Inventor 邓登飞黄泽辉李红超
Owner CHONGYI ZHANGYUAN TUNGSTEN
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