What are the properties and uses of aluminum fluoride?

Aluminum fluoride properties:

Anhydrous aluminum fluoride is a white powder with a specific gravity of 2.882-3.13g/cm3, a capacity of 1.3-1.6g/cm3, an angle of repose of about 30°, and a flow coefficient of less than 60s/kg. Insoluble in water, acid and alkali solution, very stable

Wet process aluminum fluoride is white powder, which is needle crystal, specific gravity is about 2.882～3.13g/cm3, sublimation temperature is 1272°C, slightly soluble in water, and has relatively large solubility in hydrofluoric acid solution; no The chemical performance of aluminum fluoride water is very stable, but at high temperature, aluminum fluoride containing a certain amount of crystal water will be hydrolyzed into Al2O3 and release HF gas.

Physical and chemical properties: aluminum fluoride, colorless triclinic crystal. Appearance is white powder or large orthorhombic hexahedral crystals. Density 3.00g/cm3. The melting point is 1040°C. The boiling point (sublimation) is 1272°C. Slightly soluble in cold water, soluble in hot water. Insoluble in acid and alkali solution, insoluble in most organic solvents, insoluble in hydrofluoric acid and liquefied hydrogen fluoride. Co-heating with liquid ammonia or concentrated sulfuric acid, or co-melting with potassium hydroxide has no reaction. It is not reduced by hydrogen, does not decompose but sublimes under strong heat, and is very stable in nature. When heated to 300-400°C, it can be partially decomposed into hydrogen fluoride and aluminum oxide by water vapor. There are three hydrates, namely monohydrate, trihydrate and nonahydrate.

Uses of aluminum fluoride:

In the aluminum electrolysis industry, it is used to reduce the melting temperature of the electrolyte and increase the conductivity. It is used as a flux for non-ferrous metals, a flux for ceramic glazes and enamel glazes and a component of glazes, and an inhibitor of secondary fermentation in essential oil production. . Used as an inhibitor of secondary fermentation in alcohol production.

Safety protection of aluminum fluoride:

1. Skin contact: Take off the contaminated clothing, rinse immediately with water for at least 15 minutes

2. Eye contact: Immediately lift the eyelids, rinse with running water for 10 minutes or rinse with 2% sodium bicarbonate solution

3. Inhalation: Quickly leave the scene to a place with fresh air. Keep airway open. Give oxygen if breathing is difficult. Once breathing stops, begin CPR immediately. Seek medical attention.

4. Ingestion: Immediate gastric lavage if swallowed by mistake. seek medical attention