Method for producing alumina with aluminum-containing metallurgical material

Abstract

The invention relates to a method for producing alumina with aluminum-containing metallurgical material; the process comprises sulfuric acid decomposition of aluminum-containing metallurgical material, aluminium sulfate solution purification, aluminum precipitation of sodium carbonate salt, aluminum hydroxide calcination, sodium carbonate salt regeneration, sulphuric acid regeneration and other main procedures; the sulphuric acid, sodium bicarbonate and other chemical raw materials used in an alumina production process can be regenerated and recycled; and the method has the advantages of goodalumina product quality, low production cost, environmental-friendliness and the like.

Description

technical field

[0001] The invention relates to a method for producing alumina from aluminum-containing metallurgical materials. Background technique

[0002] Alkaline, acid, combined acid-base and thermal processes can be used to produce alumina. Alkali method process is: aluminum-containing metallurgical materials are decomposed by alkali to obtain sodium aluminate solution, sodium aluminate solution is decomposed to obtain aluminum hydroxide, and aluminum hydroxide is calcined to obtain aluminum oxide; acid method process is: decomposed with nitric acid, sulfuric acid or hydrochloric acid Acidic aluminum salt solution is obtained from aluminum-containing metallurgical materials, aluminum salt solution is crystallized to obtain hydrated aluminum salt crystals or alkali neutralized to obtain aluminum hydroxide, hydrated aluminum salt crystals or aluminum hydroxide is calcined to obtain alumina; the process of acid-base combined method is: first Use the acid method to prepa...