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A method of producing high-purity sodium sulfide

A production method and technology for sodium sulfide, applied in chemical instruments and methods, sulfur compounds, alkali metal sulfides/polysulfides, etc., can solve the problems of incomplete calcination of pulverized coal, high iron content, small contact area, etc. The effect of improving the conversion rate of raw materials, reducing the content of SO2, and reducing the content of iron ions

Inactive Publication Date: 2017-02-15
马艳玲
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing mixture of Glauber's salt and coal powder is only simple mixing, and Glauber's salt is usually irregular flakes or granules. Simple mixing has a small contact area. Powder calcination is not complete, a large amount of waste gas is produced, and the output of sodium sulfide is low
The above two kinds of industrial sodium sulfide produced have the problems of many impurities and high iron content, which will affect the quality of the final product during the application process. For example, if the sodium sulfide product with high iron content is applied to the copper ore beneficiation industry, the production of copper products will be difficult. There will be problems with impure quality
If sodium sulfide products with high iron content are used in the leather industry, the leather products produced by customers will have poor color and quality problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The present embodiment focuses on the production method of high-purity sodium sulfide, which may further comprise the steps:

[0011] S100: Put raw coal, Glauber's salt, and catalyst ferric oxide in a ball mill, and grind to 120-130 mesh. Among them, Glauber's salt: coal: ferric oxide is: 5:2:0.04 (weight ratio).

[0012] S200: After grinding, send it to the mixer for mixing and stirring. After grinding, the contact area between pulverized coal powder and Glauber's salt increases, thereby improving the completeness of the reaction. Stir the pulverized coal powder and thenardite powder to make it evenly mixed, so as to make the full contact between the thenardite powder and the coal powder, and improve the completeness of the reaction.

[0013] S300: After the stirring is completed, the mixture is sprayed into a calciner, and calcined and reduced at a high temperature of 900-1100°C. The impurity in industrial sodium sulfide products is Na 2 CO 3 、Na 2 S x 、Na 2 S...

experiment example 1

[0019] Add 3100g / m 3 Sodium carbonate and 900g / m 3 Sodium sulfide, then add sodium hydroxide to make the pH value of Glauber's salt carbon reduction leaching solution reach 10; then add 0.35%wt polyferric chloride to settle the various precipitates generated, and finally add sulfuric acid to adjust Glauber's salt carbon reduction leaching solution The PH value reaches 7.2, so that the Glauber's salt carbon reduction leaching solution with extremely low impurity content can be obtained after refining and purification treatment, and then input into the Glauber's salt carbon reduction leaching solution storage tank, and then pumped into the crystallizer for 70 minutes to quickly freeze and crystallize in a vacuum to the process The temperature is 30°C, the vacuum degree is controlled at -0.096Mp, and it is put into a static separation device for 35 minutes, and then the centrifuge is used for solid-liquid separation. The mother liquor is sent to the mother liquor storage tank, an...

experiment example 2

[0021] Add 2900g / m 3 Sodium carbonate and 980.3g / m 3Sodium sulfide, then add sodium hydroxide to make the pH value of Glauber's salt carbon reduction leaching solution reach 10; then add 0.45%wt polyferric chloride to settle the various precipitates generated, and finally add sulfuric acid to adjust Glauber's salt carbon reduction leaching solution The PH value reaches 6.8. In this way, the Glauber’s salt carbon reduction leaching solution with extremely low impurity content can be obtained after refining and purification treatment, which is input into the Glauber’s salt carbon reduction leaching solution storage tank, and then pumped into the crystallizer for 80 minutes to freeze and crystallize quickly in a vacuum. The process temperature is 60°C, the vacuum degree is controlled at -0.089Mpa, and it is put into a static separation device for 40 minutes, and then the centrifuge is used for solid-liquid separation. The mother liquor is sent to the mother liquor storage tank, a...

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PUM

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Abstract

A method of producing high-purity sodium sulfide is disclosed. The method includes S100) a step of adding raw coal, mirabilite and a catalyst that is ferric oxide into a ball mill, and grinding, with the weight ratio of the mirabilite, the raw coal and the ferric oxide being 5:2:0.04, S200) a step of, after grinding, conveying into a stirrer, and stirring to fully mix the mixture, and S300) a step of, after stirring is finished, spraying the mixture into a calciner, maintaining a slightly-negative pressure atmosphere in the calciner, controlling the air excessive amount during calcination through a flue residual-oxygen detecting device, and maintaining the calcination temperature to be 1000-1100 DEG C through a material temperature monitoring device and a flue gas temperature monitoring device. The sodium sulfide produced by the method is high in purity and wide in application.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a production method of high-purity sodium sulfide. Background technique [0002] Sodium sulfide is also called smelly alkali, smelly soda, yellow alkali, and alkali sulfide. Sodium sulfide is an inorganic compound, and pure sodium sulfide is a colorless crystalline powder; it has strong moisture absorption and is easily soluble in water; the aqueous solution is strongly alkaline; it will cause burns when it touches the skin and hair; therefore, sodium sulfide is commonly known as alkali sulfide. At present, there are two main production methods of industrial sodium sulfide in my country, one is the main production method - Glauber's salt calcination method; the other is the secondary production method - precipitation of barium sulfate and secondary production of sodium sulfide. The existing mixture of Glauber's salt and coal powder is only simple mixing, and Glauber's salt is us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/26C01B17/36
CPCC01B17/26C01B17/36C01P2006/80
Inventor 马艳玲
Owner 马艳玲
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