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Production process for preparing ultra-white nanometer sodium pyroantimonate

A technology for ultra-white sodium pyroantimonate and production process, which is applied in antimonate/antimonite and other directions, can solve the problems of complex process, high raw material requirements, low production cost, etc., and achieves simple process flow and raw material. The effect of low requirements and extremely low production cost

Inactive Publication Date: 2010-04-14
ZHUZHOU ANTE ANTIMONY CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sodium nitrate oxidation method: use thick antimony oxide powder or antimony white as raw material, add sodium carbonate as solvent, and sodium nitrate as oxidant to react and synthesize the product at high temperature. This method has simple process, low investment and low production cost, but Poor product quality, difficult to control waste gas pollution
Hydrogen peroxide oxidation method uses antimony white as raw material, sodium hydroxide as solvent, and hydrogen peroxide as oxidant to directly synthesize the product. This method has simple process, low investment, good product quality and no "three wastes", but has high requirements for raw materials, that is, production high cost
The chlorine gas method uses crude antimony oxide powder or antimony sulfide ore as raw material, hydrochloric acid as solvent, chlorine gas as oxidant, and the product is obtained through leaching, oxidation hydrolysis, neutralization and other steps. The product quality of this method is excellent, but the process is complicated, the investment is large, and the equipment High anti-corrosion requirements, large amount of waste water
The air oxidation method uses antimony sulfide as raw material, sodium hydroxide and sodium sulfide as solvent, air as oxidant, and synthesizes products through leaching, oxidation and other steps. This method has simple equipment and low production cost, but its product grade is low and sodium thiosulfate

Method used

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  • Production process for preparing ultra-white nanometer sodium pyroantimonate
  • Production process for preparing ultra-white nanometer sodium pyroantimonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The preparation concentration is 1200L of potassium hydroxide aqueous solution of 1.12 (specific gravity), 200kg of antimony oxide powder (Sb: 147.6kg) is added in the oxidation reaction kettle respectively, and the temperature is at 60 ℃. The temperature rises to about 120°C, and the antimony trioxide is all converted into potassium antimonate, and the reaction ends without foam in the reaction kettle; Reaction equation: Sb 2 O 3 +2KOH+2H 2 O 2 +3H 2 O→2KSb(OH) 6 ;

[0016] The reaction solution was pumped into the clarification kettle, clarified for more than half an hour, then the clear liquid was pumped into the double decomposition kettle, and 49 kg of NaOH was added to prepare an aqueous solution with a concentration of 1.3 (specific gravity), and the reaction was carried out under normal pressure and at a temperature not greater than 120 ° C. React for more than half an hour to get the precipitate sodium pyroantimonate (reaction equation is: KSb(OH) 0 +NaOH...

Embodiment 2

[0018] The formula is 1500L of potassium hydroxide aqueous solution of 1.20 (specific gravity), 250kg of antimony oxide powder (Sb: 184.5kg) is added to the oxidation reaction kettle respectively, and 220 liters of 27.5% hydrogen peroxide are added at 70 ° C to carry out stirring reaction, and rise to 110 ° C for reaction 2 After 1 hour, the reaction solution was pumped into the clarification kettle, clarified for more than half an hour, and then pumped into the double decomposition kettle, and the aqueous solution prepared by 61 kg of NaOH was added to react, and the reaction was carried out under normal pressure and temperature not higher than 110 ° C for 1 hour, and the precipitate was centrifuged and dried. The sodium pyroantimonate with whiteness ≥93 is obtained by sieving, and the mother liquor is returned to the oxidation process.

[0019] The method firstly converts antimony into water-soluble potassium antimonate, removes other heavy metals and impurities, and then con...

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Abstract

The invention relates to a production process for preparing ultra-white nanometer sodium pyroantimonate. The process comprises the following steps: adopting low-quality antimonious oxide powder and adding 27.5 percent hydrogen peroxide for reacting at 60-120 DEG C for 1-2 h by using a potassium hydroxide solution as a leaching agent, wherein the solid-liquid ratio of the antimonious oxide powder and the potassium hydroxide solution is 1:5-20; clarifying the reaction liquid for more than half an hour, pumping the supernate into a double decomposition kettle and adding a sodium hydroxide solution into the double decomposition kettle for reaction under normal pressure to convert potassium antimonate into sodium antimonate; separating the sediment by centrifugation, drying and screening to obtain the ultra-white nanometer sodium pyroantimonate product with the whiteness of more than 93 percent; and leaching and oxidizing the double decomposition mother liquor for recycling. The obtained product has the whiteness of more than 93 percent and can be used as a clarifying defoaming agent and a flame retardant agent in solar power generation and dominant white glass.

Description

Technical field [0001] The invention belongs to the field of metallurgical chemical industry and relates to a production process for preparing sodium pyroantimonate, in particular to a production process for preparing ultra-white sodium sodium pyroantimonate. Background technique [0002] Ordinary sodium pyroantimonate is mainly used for black and white, color display screens, picture tubes, glass clarifiers, glass fiber, gem glass, high-end glass tableware; there are currently four main methods for producing sodium pyroantimonate, namely 1. Nitric acid Sodium oxidation method 2. Hydrogen peroxide oxidation method; 3. Chlorine oxidation method; 4. Air oxidation method. Sodium nitrate oxidation method: It uses crude antimony oxygen powder or antimony white as raw material, adds sodium carbonate as solvent, and sodium nitrate as oxidant to react and synthesize the product at high temperature. This method has simple process, low investment and low production cost, but Product ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G30/02
Inventor 李伟星陶树阳明
Owner ZHUZHOU ANTE ANTIMONY CHEM IND
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