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Method for jointly producing aluminum oxide and cement by use of bauxite

A joint production and alumina technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problem of high raw material cost, achieve the effect of reducing raw material cost, optimizing technical and economic indicators, and optimizing wet series process

Inactive Publication Date: 2014-09-24
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, it is made of high-quality limestone (CaO≥55%) and industrial alumina, and the cost of raw materials is high.

Method used

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  • Method for jointly producing aluminum oxide and cement by use of bauxite
  • Method for jointly producing aluminum oxide and cement by use of bauxite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The dealuminated slag obtained by adding lime to the red mud dissolution process in the wet series process is mixed with industrial aluminum hydroxide at a mass ratio of 1:1.3 and ground, and sintered at 1600 ° C for 30 minutes to obtain pure calcium aluminate cement. Chemical CompositionAl 2 o 3 content of 69%, CaO content of 28%, SiO 2 The content is 0.42%, Na 2 O content is 0.26%, MgO content is 0.42%, Fe 2 o 3 The content is 0.16%, TiO 2 The content is 0.033%. Its mineral composition is calcium aluminate CaO·Al 2 o 3 and calcium dialuminate CaO·2Al 2 o 3 , basically no 12CaO·7Al 2 o 3 .

Embodiment 2

[0025] The dealuminized slag obtained by adding lime to the red mud dissolution process in the wet series process is mixed with industrial alumina at a mass ratio of 1:1.2, mixed and ground, and sintered at 1550 ° C for 60 minutes to obtain pure calcium aluminate cement. CompositionAl 2 o 3 content of 74%, CaO content of 23%, SiO 2 The content is 0.32%, Na 2 O content is 0.25%, MgO content is 0.44%, Fe 2 o 3 The content is 0.22%, TiO 2 The content is 0.05%. Its mineral composition is calcium aluminate CaO·Al 2 o 3 and calcium dialuminate CaO·2Al 2 o 3 , basically no 12CaO·7Al 2 o 3 .

Embodiment 3

[0027] Add the dealuminized slag obtained by adding lime to the red mud solution in the wet series process and industrial alumina at a mass ratio of 1:1.2, and sinter at 1450°C for 60 minutes to obtain pure calcium aluminate cement with its chemical composition Al 2 o 3 content of 72%, CaO content of 24%, SiO 2 The content is 0.45%, Na 2 O content is 0.26%, MgO content is 0.37%, Fe 2 o 3 The content is 0.46%, TiO 2 The content is 0.04%. Its mineral composition is calcium aluminate CaO·Al 2 o 3 and calcium dialuminate CaO·2Al 2 o 3 , basically no 12CaO·7Al 2 o 3 .

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Abstract

The invention relates to a method for jointly producing aluminum oxide and cement by use of bauxite. The method is characterized in that by adopting a wet process to produce aluminum oxide in series, dealumination slags in the process of producing aluminum oxide by a wet process serial process are directly used as raw materials to produce calcium aluminate cement. According to the method provided by the invention, by adopting the wet process serial process to produce aluminum oxide, the dealumination slags in the production process are used as the raw material to prepare calcium aluminate and pure calcium aluminate cement, so that on the one hand, the technical-economic indicator of the wet process serial process is further optimized, and on the other hand, the cost of the raw material for producing calcium aluminate cement is lowered.

Description

technical field [0001] The invention discloses a method for joint production of alumina and cement from bauxite, which relates to the generation and application of dealumination slag in the process of producing alumina from medium and low-grade bauxite and the preparation method of calcium aluminate cement. Background technique [0002] my country's bauxite resources are mostly high-alumina, high-silicon, and low-to-medium grade diaspore-type bauxite. In order to reduce alkali consumption, energy consumption and make more effective use of bauxite resources, a new wet series process suitable for processing low- and medium-grade bauxite has been successfully developed. "Method" (Patent No.: ZL 200710118667.1), firstly the bauxite is leached by the Bayer method, and then the Bayer red mud is wet-processed with a high-molecular ratio circulating lye, and the Bayer red mud leaching solution is added with lime to dealuminate the obtained high Molecular ratio dealuminated circulat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C04B7/32
Inventor 尹中林李新华顾松青杨桂丽
Owner GUIZHOU BRANCH CHINA ALUMINUM IND