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Method of removing tin from sodium tungstate solution

A technology from sodium tungstate and sodium tungstate, applied in the field of tin removal from sodium tungstate solution, can solve the problems such as poor tin removal effect

Inactive Publication Date: 2017-08-01
JIANGXI RARE EARTH & RARE METALS TUNGSTEN GRP HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The methods disclosed in the above two patent applications can only deal with sodium tungstate solutions with low tin content. If the tin content in the sodium tungstate solution is too high, the method will not be effective in removing tin.

Method used

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  • Method of removing tin from sodium tungstate solution

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Effect test

Embodiment 1

[0056] A kind of method for removing tin from sodium tungstate solution provided by the invention comprises the following steps:

[0057] (1) Take 1000ml tin-containing sodium tungstate solution, wherein WO 3 The concentration of Sn is 132g / l, the concentration of Sn is 21mg / l, add 1ml of industrial hydrogen peroxide, slowly add sulfuric acid to adjust the alkalinity of sodium tungstate solution, maintain the alkalinity at 1.8g / l, the temperature is 35°C, and react for 30min to prepare Contains SnO 3 2- Sodium tungstate solution;

[0058] (2) the SnO containing SnO prepared in step (1) 3 2- First add 1.81g of ferric chloride to the sodium tungstate solution, the mass ratio of Fe to Sn is 30, then add sodium hydroxide, keep stirring, keep the temperature at 40°C, and react for 50min to make the tin in the sodium tungstate solution adsorb In the ferric hydroxide precipitate formed.

[0059] (3) finally the solid-liquid mixture containing ferric hydroxide precipitation that...

Embodiment 2

[0061] A kind of method for removing tin from sodium tungstate solution provided by the invention comprises the following steps:

[0062] (1) Take 1000ml tin-containing sodium tungstate solution, wherein WO 3 The concentration of Sn is 123g / l, the concentration of Sn is 34mg / l, add 1ml of industrial hydrogen peroxide, slowly add sulfuric acid to adjust the alkalinity of sodium tungstate solution, maintain the alkalinity at 2.0g / l, the temperature is 40°C, and react for 40min to prepare Contains SnO 3 2- Sodium tungstate solution;

[0063] (2) the SnO containing SnO prepared in step (1) 3 2- First add 6.1g of iron sulfate to the sodium tungstate solution, the mass ratio of Fe to Sn is 50, then add sodium hydroxide, keep stirring, keep the temperature at 60°C, and react for 50min to make the tin in the sodium tungstate solution adsorb on The resulting ferric hydroxide precipitates.

[0064] (3) finally the solid-liquid mixture containing ferric hydroxide precipitation that...

Embodiment 3

[0066] A kind of method for removing tin from sodium tungstate solution provided by the invention comprises the following steps:

[0067] (1) Take 1000ml tin-containing sodium tungstate solution, wherein WO 3 The concentration of Sn is 146g / l, the concentration of Sn is 41mg / l, adding 1ml of industrial hydrogen peroxide, slowly adding sulfuric acid to adjust the alkalinity of sodium tungstate solution, maintaining the alkalinity at 2.2g / l, the temperature is 45°C, and reacting for 40min to prepare Contains SnO 3 2- Sodium tungstate solution;

[0068] (2) the SnO containing SnO prepared in step (1) 3 2- Add 14.2g of ferric nitrate to the sodium tungstate solution, the mass ratio of Fe to Sn is 80, then add sodium hydroxide, keep stirring, keep the temperature at 60°C, and react for 50min to make the tin in the sodium tungstate solution adsorb on The resulting ferric hydroxide precipitates.

[0069] (3) finally the solid-liquid mixture containing ferric hydroxide precipita...

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Abstract

The invention discloses a method of removing tin from a sodium tungstate solution. The method comprises the following steps: (1) an oxidizing agent is added to the sodium tungstate solution containing tin, acid is slowly dropwise added for adjusting the alkalinity of the sodium tungstate solution, and reaction lasts for 20-60min with the temperature being maintained at 30-60 DEG C; (2) soluble molysite and alkali are added to a solution in the step (1) sequentially, reaction lasts for 30-90min with the temperature being maintained at 30-100 DEG C, and a solid-liquid mixture containing ferric hydroxide sediment is prepared, wherein a mass ratio of iron to tin in the soluble molysite is (30-100):1; and (3) the prepared solid-liquid mixture is filtered for 3-5 times with deionized water, the ferric hydroxide sediment is removed, finally filtrate is subjected to vulcanization, acid adjustment, extraction and crystallization, and a ammonium paratungstate product with the tin content being less than 2ppm is obtained. The method can remove high-content tin in the sodium tungstate solution and does not cause tungsten loss.

Description

technical field [0001] The invention relates to the technical field of tungsten hydrometallurgy, in particular to a method for removing tin from sodium tungstate solution. Background technique [0002] Tungsten is a refractory non-ferrous metal and an important strategic resource. It is widely used because of its excellent properties such as high melting point, high hardness, strong ductility, wear resistance and corrosion resistance. With the development of tungsten products towards high purity With the development of the direction, the requirements for impurity removal in the smelting process are getting higher and higher. [0003] Tin is an impurity element that needs to be strictly limited in tungsten products. According to my country's national standard on ammonium paratungstate (APT), GB10116-88 stipulates that the tin content in APT-0 grade products cannot exceed 2ppm. Since all tungsten smelting enterprises in my country used standard ore in the past, the tin conten...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B34/36
CPCC22B3/44C22B34/36Y02P10/20
Inventor 黄亮徐双谢金明李继红卢瑞平
Owner JIANGXI RARE EARTH & RARE METALS TUNGSTEN GRP HLDG CO LTD
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