Alumina production process by using monohydrate bauxite lime Bayer process

Abstract

The production process of alumina by using monohydrate bauxite ore and adopting Bayer process is characterized by that when preparing ore pulp, the lime is added according to the demand for that the CaO content being in lime and TiO2 content being in bauxite are reacted to produce perovskite and the CaO in the lime and SiO2 being in bauxite are reacted to form hydrated calcium silicate, in which the molecular ratio of CaO added for balancing TiO2 is C/T=1-1.5 and the molecular ratio of CaO added for balancing SiO2 is C/S=1.5-3.0 and then the ore pulp is undergone the process of desilication pretreatment at 90-110 deg.c for 2-12 hr. and then undergone the conventional Bayer process. Its desilicated product mainly is hydrated calcium silicate.

Description

(1) Technical field [0001] The process of producing alumina by the Bayer process of monohydrate bauxite lime relates to a process for producing alumina by using the Bayer process with monohydrate bauxite, especially the production of alumina by the Bayer process using monohydrate bauxite as raw material. Aluminum process methods. (2) Background technology [0002] At present, in the production of alumina, there are mainly Bayer method, sintering method or hybrid method to realize industrial production. Among them, the Bayer method has the advantages of low energy consumption, simple process, and low production cost. However, the production of alumina by the Bayer method has strict requirements on raw materials. Generally, the raw material aluminum-silicon ratio is required to be greater than 10, which is especially suitable for the use of high-aluminum-silicon ratio. Alumina production from trihydrate bauxite raw materials. Most of my country's bauxite resources are monohy...

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Problems solved by technology

However, this method is still not ideal in the