Production Method Of Aluminum Hydroxide

1. In the aluminum sulfate solution, add alkaline solution under stirring to form a precipitate, which is washed, filtered, and dried at low temperature, and then pulverized to obtain the finished product. The dehydrated paste can also be used directly as a product. The concentration, temperature, reaction temperature control and drying temperature of the solution in the preparation affect the product quality.

2. The action of sulfuric acid and aluminum powder or aluminum ash to generate aluminum sulfate, and then metathesis reaction with ammonium bicarbonate to obtain aluminum hydroxide. Or neutralize with sodium aluminate solution and aluminum sulfate solution to pH 6.5 to form aluminum hydroxide precipitate, wash with water, filter under pressure, dry at 70-80°C, and then pulverize to obtain aluminum hydroxide. Its reaction formula:

3. Water aluminum oxygen has:

(1) under the condition of 40～60℃, pH>12, blow carbon dioxide into the sodium aluminate aqueous solution; place at room temperature without adding or adding hydrate aluminum oxide crystal seed to the sodium aluminate aqueous solution;

(2) Al(OC2H5)3 and 1%-20% ethanolamine NH2C2H4OH coexist, hydrolyze at 20-60°C, and age the resulting gel for several months.

Bayerite has:

1) Blow carbon dioxide into sodium aluminate aqueous solution at normal temperature;

2) The aluminum amalgam is hydrolyzed at normal temperature;

(3) Al(OC2H5)3 is hydrolyzed below 70℃;

(4) A method of neutralizing an aqueous aluminum chloride solution with an alkali metal hydroxide or ammonia, and the like. The boehmite has methods such as hydrothermal treatment of aluminum hydroxide in aluminum hydroxide aqueous solution or weak alkaline aqueous solution at 150-300 ° C; aluminum amalgam is oxidized with boiling water. The stable region of diaspore is 275～425℃, and the water vapor pressure is above 140atm (1atm=98.066kPa). According to reports, diaspore can be obtained by hydrothermal treatment of aluminum hydroxide, and hydrothermal treatment of ρ alumina and χ alumina generated by hydrazine-oxygen vacuum dehydration.