Manufacture of sapphire alumina is how to produce? - Shanghai appropriate xin chemical co. , LTD

a sapphire, it is a kind of single crystal alumina, alias called corundum, sapphire crystal as an important technology, widely used in many fields, growing sapphire companies in the country in recent years, foreign also has a lot of set up production base in China.

sapphire crystal manufacturer to the increase in the number of promoting to increase demand for alumina, at the same time, also requires a high degree of purity of alumina sapphire, so, the requirements of the sapphire high purity alumina is how to produce?

at present, both at home and abroad, mainly for the production of high purity alumina have aluminum alkaline hydrolysis method, ammonium aluminum sulfate pyrolysis and isopropanol aluminum hydrolysis method.

( 1) First the purity of 99 aluminum bile alkaline hydrolysis method. 9% of aluminum foil cutter, use strong anion exchange resin turn choline chloride generated choline, then add the aluminum foil which reaction, cyclical reaction, finally will be filtered aluminum hydroxide drying and calcining alumina powder, the purity can reach 99. 99%.

( 2) Ammonium aluminum sulfate pyrolysis method, this method need to sulfuric acid and aluminium hydroxide reaction of aluminium sulfate solution, then add ammonium alum, according to many times for recrystallization purity requirements is delicate and ammonium alum, and then decomposed under the high temperature alumina powder.

( 3) Alcohol aluminum hydrolyzing method, this method is the preparation of high purity alumina abroad mainly adopts the method, this method adding aluminum and organic alcohol catalyst synthesis, purification, hydrolysis and calcination technology of ultrafine aluminum oxide powder, the process has divided into distillation and distillation in the purification, the purity is different also. The purity of distillation method can reach 99. 999%, slightly lower distillation.