Method for producing alumina by sintering lime of sulfur-containing bauxite

Abstract

The invention relates to the technical field of aluminum oxide, and in particular relates to a method for producing aluminum oxide through sintering sulfur-containing monohydrallite and lime. According to the method, through properly adding a small amount of flue gas desulfurization slag and the lime into sulfur-containing monohydrallite for sintering, the aluminum oxide is produced, enabling aluminum element and sulphur element in a raw material to form a 4Cao.3Al2O3.SO3 phase, and by enabling silicon element to form a gamma-2CaO.SiO2 phase, and then adopting a low-temperature dissolution technology to perform aluminum oxide production, the deleterious effect of the sulphur element is reduced, the aluminum oxide dissolution performance of clinker is improved, and better market application value and social benefit are realized.

Description

technical field

[0001] The invention relates to the technical field of alumina production, in particular to a process for producing alumina by a lime sintering method containing sulfur in raw materials such as low-grade bauxite or limestone. Background technique

[0002] The rapid development of the alumina industry has caused a sharp decline in the grade of available bauxite resources, and the development of new available bauxite resources has become the focus of current research work. my country is rich in high-sulfur bauxite resources, with a sulfur content between 0.7% and 4%. The current proven reserves are 150 million tons, accounting for 11% of the total reserves of bauxite resources. Therefore, there is an urgent need for a sulfur-containing aluminum The comprehensive utilization method of soil ore.

[0003] At present, there are two kinds of alumina production technologies for industrial application. One is the Bayer alumina production process. The Bayer process has...

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