Bauxite low temperature continuous dissolving out technology

A bauxite, low-temperature technology, applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problems of high energy consumption and large equipment investment, and achieve the simplification of employee operation, reduction of operation intensity and operation. simple effect
CN1260128CActive Publication Date: 2006-06-21GUIZHOU BRANCH CHINA ALUMINUM IND
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUIZHOU BRANCH CHINA ALUMINUM IND
Publication Date
2006-06-21

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Abstract

The invention belongs to the technical field of alumina production, and specifically relates to a low-temperature continuous dissolution process for bauxite, which includes pipeline dissolution, heat preservation and desilication under pressure, and self-evaporation cooling. The cooled exhaust steam is used for dissolution preheating; the pipeline dissolution is indirect steam heating and dissolution, and there is a heating steam chamber outside the dissolution pipeline, and the spirally coiled dissolution tube from bottom to top corresponds to the feed layer. First-level exhaust steam heating, first-level exhaust steam heating and fresh steam heating. The indirect heating of the bauxite low-temperature dissolution process of the present invention avoids the situation of directly heating the condensed water in the slurry, realizes continuous production, and makes effective use of steam condensed water and exhaust steam waste heat from evaporation and cooling, reducing The amount of steam is reduced, the energy consumption of production is reduced, the operation is simple, it is beneficial to the actual industrial production, and the economic and social benefits are considerable.
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Description

technical field

[0001] The invention relates to a bauxite dissolution process technology in alumina production, and belongs to the technical field of alumina production. Background technique

[0002] Bauxite is currently the most important raw material in alumina production. It is divided into gibbsite type, boehmite type, diaspore type and various mixed types. Its properties and mineral composition determine alumina Currently, the production methods of alumina in the world mainly include Bayer method, sintering method and combined method. Most foreign alumina manufacturers use the Bayer method to produce alumina because they have gibbsite-type bauxite; my country is rich in bauxite resources, but most of the bauxite that has been discovered is diaspore type , gibbsite-type bauxite is very little, therefore, using imported gibbsite-type bauxite to produce alumina by Bayer process is a method for domestic production of alumina.

[0003] The dissolution process is one of the ...

Claims

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