Method for producing alumina through mineral containing aluminum

Abstract

The invention discloses a method for producing alumina through mineral containing aluminum, and relates to a method for economically and effectively recycling alumina from low-quality mineral resources containing aluminum. The method is characterized in that the production process comprises the following steps: (1), the mineral containing the aluminum are mixed with lime and sodium carbonate, and the mixture is processed into chamotte through dry-method sintering; (2), after being pulverized, the sintered chamotte is dissolved out, and the dissolved-out slurry is separated and cleansed to obtain the sodium aluminate solution and red mud slag; (3), aluminium hydroxide is decomposed and separated out after the silicon of the sodium aluminate solution is removed, the mother liquid after the decomposition returns to the dissolve-out work procedure, and the aluminum hydroxide is roasted to obtain the alumina product; (4), and the red mud slag is directly used for cement production. The method can be used for processing the low-quality mineral resources containing the aluminum, which is not in the concept scope of bauxite. The production technical flow is energy-saving and environmental-friendly, and all heat resources used in the production process are the residual heat of clinker kilns, lime kilns and calcinators. In the production flow, the red mud is used as the raw material for producing cement, no red mud slag is piled, and clean production is realized.

Description

Technical field

[0001] A method for producing alumina from aluminum-containing minerals relates to a method for economically and efficiently recovering alumina from low-quality aluminum-containing mineral resources. Background technique

[0002] Alumina production usually uses bauxite as a raw material. With the continuous decline in the grade of bauxite ore, alumina production resources are in short supply and even face the danger of exhaustion. How to economically and efficiently produce alumina from low-quality aluminum-containing mineral resources within the scope of non-bauxite has become a major technical problem restricting the development of alumina production.

[0003] At present, the effective ore range stipulated by the state of bauxite resources A / S> 2.6, 1 <A / S The amount of low-quality aluminum-containing mineral resources that are not within the scope of the concept of bauxite is large, and it is currently difficult to economically utilize them. Summary of the...