Chemical properties of refined fluorosilicic acid

Exquisite fluorosilicic acid has stronger acidity than sulfuric acid, and when heated, it decomposes and releases toxic fluoride gases. Has strong corrosiveness.

Physical and chemical properties

White particles or crystalline powder. Odorless. Odorless. After scorching (at 300 ° C), it decomposes into sodium fluoride and silicon tetrafluoride. Decompose in alkaline solution. Generate fluoride and silica. Has hygroscopicity. Dissolve in 150 parts cold water, 40 parts boiling water, insoluble in ethanol. Its cold water solution is neutral, and it decomposes into acidity in hot water. The relative density is 2.679. Moderate toxicity, LD50 (rat, oral) 125mg/kg. It is stimulating.

technological process

The enterprise adopts the sedimentation process for production. The chemical equation for the reaction between fluorosilicic acid and sodium chloride solution is: H2SiF6+2NaCl=Na2SiF6 ↓+2HCl to form a precipitate of fluorosilicic acid sodium; The product is produced through liquid-solid separation, washing, drying and other processes (anti caking agents can also be added according to customer needs).

1. Phosphate fertilizer recycling method: It is a method of absorbing fluorine-containing waste gas from the production process of phosphate fertilizer (or wet process phosphoric acid) with water, and then reacting it with sodium chloride to obtain it. It is a comprehensive utilization method that turns harm into benefit, making it the main way for industrial production of sodium fluorosilicate.

2. Neutralization method: It is obtained by neutralizing fluorosilicic acid with sodium carbonate (or sodium hydroxide). Exquisite fluorosilicic acid