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Multi-pipeline preheating method for bauxite slurry

A multi-pipeline and slurry technology, which is applied in the preparation of alkali metal aluminate/alumina/hydroxide, etc., can solve the problems of bauxite slurry scabbing and other problems

Inactive Publication Date: 2005-01-26
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies in the above-mentioned prior art, and propose a method that can effectively solve the serious problem of scabbing during indirect heating of bauxite pulp, strengthen the heat transfer process of pulp preheating, stabilize operation, and prolong pulp preheating. Slurry preheating method for periodic exchange of multi-pipelines in the operating cycle of the system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Two pipelines are used to preheat the mother liquor and pulp separately. After heating, the temperature of the pulp and mother liquor is 255°C-265°C, and the confluence is dissolved at 260°C±2°C. The two pipes are used alternately every 7 days; the operation of the preheating system The cycle was extended by 35 days.

Embodiment 2

[0021] Three pipelines are used to preheat the mother liquor and pulp respectively, one of which is used to preheat the mother liquor, and two pipes are used to preheat the pulp. After heating, the temperature of the pulp and mother liquor is 265°C±5°C, and the confluence is dissolved at a temperature of 265°C±2°C. The pipeline of the mother liquor and the slurry pipeline are rotated every five days, and the operation cycle of the preheating system is extended by 30 days.

Embodiment 3

[0023] Four pipelines are used to preheat the mother liquor and the pulp respectively, one of which is used to preheat the mother liquor, and three pipes are used to preheat the pulp. After heating, the temperature of the pulp and mother liquor is 275°C±5°C, and the confluence is dissolved at a temperature of 275°C±5°C. The pipeline of the mother liquor and the slurry pipeline are rotated every three days, and the operation period of the preheating system is extended by 20 days.

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Abstract

The multipipeline bauxite slurry preheating method relates to an alumina production method by using Bayer process, in particular it relates to a method for preheating bauxite slurry and mother liquor for producing alumina by using Bayer process. It is characterized by that said preheating process of the ore slurry raw material is implemented by adopting two or more than two pipelines at the same time, in which at least one pipelins is used for heating mother liquor and other pipelines are used for heating ore slurry, and the said pipelines are periodically exchange. Said method can effectively reduce scabbing on the heated surface of ore slurry to smoothly implement indirect heating of ore slurry.

Description

Technical field [0001] The multi-pipeline bauxite slurry preheating method relates to a Bayer process alumina production method, in particular to a preheating method for bauxite slurry and mother liquor in the Bayer process alumina production process. Background technique [0002] The production process of Bayer process alumina mainly includes preparation of bauxite slurry, preheating and dissolution of bauxite slurry, sedimentation and separation of dissolved red mud (solid phase residue after dissolution), seeding decomposition after refining of the solution, and Evaporation of sodium aluminate solution after decomposition, etc. [0003] Most of the bauxite currently used in alumina production in my country is diaspore type bauxite. The dissolution process in the Bayer process requires high temperature and high alkali concentration conditions. In order to further reduce the energy consumption of alumina production, Further reducing production costs and realizing indirect h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/04
Inventor 尹中林
Owner GUIZHOU BRANCH CHINA ALUMINUM IND