Aluminum sulfate octahydrate CAS 7784-31-8 is not easily weathered and loses crystalline water, which is relatively stable. When heated, it will lose water, and at high temperatures, it will decompose into oxides of aluminum oxide and sulfur. Heating to 770 ℃ begins to decompose into alumina, sulfur trioxide, sulfur dioxide, and water vapor. Soluble in water, acid, and alkali, insoluble in ethanol. The aqueous solution is acidic. After hydrolysis, aluminum hydroxide is generated. Long term boiling of aqueous solution can generate basic aluminum sulfate. Industrial products are gray white flakes, granules, or blocks, with a light green color due to the presence of low iron salts, and a yellow surface due to the oxidation of low iron salts. The coarse product is a gray white fine crystalline porous material. Non toxic, dust can irritate the eyes.

Chemical name: Aluminum sulfate octahydrate

Appearance and properties: White crystals with a sweet taste.

Melting point (℃): 770 (decomposition)

CAS number: 7784-31-8

Relative density (water=1): 2.71

Molecular formula: Al2 (SO4) 3 · 18H2O

Molecular weight: 666.17

Solubility: Soluble in water, insoluble in ethanol, etc.

Function and purpose

In the paper industry, it is used as the precipitator of rosin size, wax lotion and other sizing materials, as the flocculant in water treatment, as well as as the retention agent of foam fire extinguishers, raw materials for manufacturing alum and aluminum white, as well as raw materials for oil decolorization, deodorant and some drugs. It can also manufacture artificial gemstones and high-grade ammonium alum. Products with arsenic content not exceeding 5mg/kg can be used as water treatment flocculants.

1. Used as a paper sizing agent in the papermaking industry to enhance the water resistance and impermeability of paper;

2. After being dissolved in water, it can cause small particles and natural colloidal particles in the water to condense into large flocs, which can be removed from the water. Therefore, it is used as a coagulant for water supply and wastewater;

3. Used as a turbid water purification agent, as well as a precipitator, color fixing agent, filling agent, etc. Used as a raw material (astringent) for anti sweat cosmetics in cosmetics;

4. In the fire protection industry, foam extinguishing agent is composed of baking soda and foaming agent;

5. Analytical reagents, mordants, tanning agents, oil decolorizers, wood preservatives;

6. Stabilizers for albumin pasteurization (including liquid or frozen whole eggs, protein or egg yolk);

7. Can be used as raw materials for manufacturing artificial gemstones, high-grade ammonium alum, and other aluminates;

8. In the fuel industry, it serves as a precipitator in the production of chrome yellow and lake dyes, while also serving as a fixing and filling agent

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