Method of acid extracting aluminium from high-silicon alumina-containing raw mineral materials

Abstract

The invention relates the method of extracting aluminium from high-silicon siliceous mineral. The method comprises the following steps: mixing the aluminous ore and sulfuric acid, baking, leaching with water, filtering leachate, getting aluminium sulphate solvent, thickening filter liquor, separating out aluminium sulphate, drying, dewatering, getting anhydrous aluminium sulphate; calcining aluminium sulphate, and getting Al2O3. The invention can extracte aluminium from high-silicon siliceous mineral, coal gangue, coal ash, China clay, andalusite, feldspath, ganister, nepheline and vermiculite without baking. The method has the advantages of simple technology, little corrosion, easy operation and high recovery ratio.

Description

technical field

[0001] A method for extracting aluminum from high-silicon and aluminum-containing mineral raw materials by acid method, involving comprehensive utilization of a low-grade, refractory aluminum-containing mineral raw material, especially involving high-silicon bauxite and aluminosilicate as the main A method for extracting aluminum from high-silicon and aluminum-containing mineral raw materials such as coal gangue, fly ash, clay, kaolin, andalusite, feldspar, sillimanite, nepheline, and vermiculite. Background technique

[0002] With the rapid development of modern industry, resource scarcity has become one of the main social problems facing people. The raw material for producing alumina is mainly bauxite. The traditional smelting method is the production of alumina by the alkali method. The silicon oxide in the ore is the main harmful element in the production by the alkali method. The ratio of aluminum to silicon in the bauxite is required to be A / S (ore The...

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