Production method of selenium sulfide

A technology of selenium disulfide and a production method, which is applied in the direction of binary selenium/tellurium compounds, etc., can solve the problems of low utilization rate of hydrogen sulfide, easy environmental pollution of hydrogen sulfide, etc., so as to avoid excessive volatilization, be environmentally friendly, and control production costs. Effect

Active Publication Date: 2013-03-06
广东先导稀贵金属材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method hydrogen sulfide utilization rate is low, and hydrogen sulfide easily pollutes the environment

Method used

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  • Production method of selenium sulfide

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Effect test

Embodiment 1

[0027] A kind of selenium sulfide production technique, operation is as follows:

[0028] (1) Dissolve selenium dioxide in water under stirring and filter the solution to control the concentration of selenium dioxide solution to be 100g / L.

[0029] (2) Dissolve technical grade sodium sulfide in water and filter the solution to control the solution concentration to 150g / L.

[0030] (3) While stirring the selenium dioxide aqueous solution, drip sodium sulfide solution and glacial acetic acid simultaneously in the selenium dioxide aqueous solution, continue to stir for 0.5~3 hours after the dropwise addition so that selenium dioxide, sodium sulfide and glacial acetic acid fully During the reaction, the reaction temperature was controlled to be ≤40°C, and the stirring was continued for 1 hour after feeding.

[0031] (4) Put the solution that has completed step (3) into a centrifuge for centrifugation, and wash it with pure water in the centrifuge until it is neutral.

[0032] (5...

Embodiment 2

[0035] A kind of selenium sulfide production technique, operation is as follows:

[0036] (1) Dissolve selenium dioxide in water under stirring and filter the solution, and control the concentration of selenium dioxide solution to be 150g / L.

[0037] (2) Dissolve technical grade sodium sulfide in water and filter the solution to control the solution concentration to 200g / L.

[0038] (3) While stirring the selenium dioxide aqueous solution, drip sodium sulfide solution and glacial acetic acid simultaneously in the selenium dioxide aqueous solution, continue to stir for 0.5~3 hours after the dropwise addition so that selenium dioxide, sodium sulfide and glacial acetic acid fully to react. During the reaction process, the reaction temperature was controlled to be less than or equal to 40°C, and stirring was continued for 2.5 hours after feeding.

[0039] (4) Put the solution that completed step (3) into a centrifuge for centrifugation, and wash with pure water in the centrifuge...

Embodiment 3

[0043] A kind of selenium sulfide production technique, operation is as follows:

[0044] (1) Dissolve selenium dioxide in water under stirring and filter the solution, and control the concentration of selenium dioxide solution to be 200g / L.

[0045] (2) Dissolve technical grade sodium sulfide in water and filter the solution to control the solution concentration to 350g / L.

[0046] (3) While stirring the selenium dioxide aqueous solution, drip sodium sulfide solution and glacial acetic acid simultaneously in the selenium dioxide aqueous solution, continue to stir for 0.5~3 hours after the dropwise addition so that selenium dioxide, sodium sulfide and glacial acetic acid fully to react. During the reaction process, the reaction temperature was controlled to be less than or equal to 40°C, and the stirring was continued for 2 hours after feeding.

[0047] (4) Put the solution that completed step (3) into a centrifuge for centrifugation, and wash with pure water in the centrifu...

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Abstract

The invention relates to a production method of selenium sulfide. The method comprises the following steps: preparing 100-200g / L selenium dioxide solution through stirring, filtering, preparing 150-350g / L sodium sulfide solution, filtering, dropping sodium sulfide solution and glacial acetic acid at the same time in the selenium dioxide solution under stirring, stirring continuously to promote the reaction; placing the obtained solution in a centrifugal machine after the reaction for centrifugal separation, washing the obtained selenium sulfide product to be neutral; and drying to obtain the selenium sulfide product. The method in the invention has simple and practical technology, is easy to operate and can meet the requirements of environmental protection. In the operation, the dropping speed is required to be controlled when sodium sulfide and glacial acetic acid are dropped; hydrazine hydrate can be added in the residual solution with unreacted selenium dioxide after the centrifugal separation to reduce selenium dioxide and recycle selenium, thus the production cost can be effectively reduced and controlled and the method is environmentally friendly; and the reaction temperature is controlled in the reaction process, thus less acetic acid can be volatilized.

Description

technical field [0001] The invention relates to a method for producing selenium disulfide, in particular to a method for preparing selenium disulfide by reacting in an aqueous solution with selenium dioxide, glacial acetic acid and sodium sulfide as raw materials. Background technique [0002] Selenium Sulfide is bright orange to reddish brown powder, molecular weight: 143.08, with a faint smell of hydrogen sulfide, insoluble in water, slightly soluble in chloroform, very slightly soluble in ether, basically insoluble in other organic solvents. Selenium disulfide is mainly used to treat eczema and bacterial infection in cats or dogs, 25% suspension is used as shampoo for chronic seborrheia, and it is also used in instrument and instrument industry. This product has a strong stimulating effect on the eyes, skin, and mucous membranes, and can cause poisoning if taken by mistake. This product is poisonous, incombustible, and releases toxic gas when it is decomposed by high hea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/04
Inventor 朱世会朱世明朱刘
Owner 广东先导稀贵金属材料有限公司
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