Method for producing sponge iron co-production sodium aluminate solution by using Bayer process red mud

A Bayer red mud and sodium aluminate technology, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, can solve the problems of increased red mud discharge, complicated process, and high cost, and achieves Environmental protection, easy technical parameters, and the effect of improving production capacity

Active Publication Date: 2010-09-15
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the complex process and high cost of processing the Bayer red mud by the series method at present, and the discharge of the red mu

Method used

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  • Method for producing sponge iron co-production sodium aluminate solution by using Bayer process red mud
  • Method for producing sponge iron co-production sodium aluminate solution by using Bayer process red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] In this example, Fe in the Bayer process red mud 2 o 3 The mass content is 28%, comprises the following steps:

[0059] (1) drying and crushing after washing the Bayer red mud, so that the particle size of the broken Bayer red mud is 30 microns;

[0060] (2) Mix the crushed Bayer process red mud with the first type of auxiliary agent, the second type of auxiliary agent and the catalytic auxiliary agent to make the mixture raw meal,

[0061] Among them, the first type of additive is a mixture of coke, anthracite, lignite and returned sintered material (the mass ratio of the four substances is 3:2:2:3), including 70% of the particles with a particle size of 20 microns by weight percentage. The first type of additives and 30% of the first type of additives with a particle size of 5 microns, the amount of the first type of additives is 1.8 times the theoretical carbon content required to reduce all the iron oxide in the Bayer process red mud ,

[0062] The second type o...

Embodiment 2

[0072] In this example, Fe in the Bayer process red mud 2 o 3 The mass content is 38%, comprises the following steps:

[0073] (1) drying and crushing after washing the Bayer red mud, so that the particle size of the broken Bayer red mud is 70 microns;

[0074] (2) Mix the crushed Bayer process red mud with the first type of auxiliary agent, the second type of auxiliary agent and the catalytic auxiliary agent to make the mixture raw meal,

[0075] Wherein, the first type of auxiliary agent is a mixture of graphite, coke and anthracite (the mass ratio of the three substances is 4:2:4), including 80% of the first type of auxiliary agent with a particle size of 100 microns and 20% of the first type of additives with a particle size of 3 microns, the amount of the first type of additives is 1.1 times the theoretical carbon content required after all the iron oxide in the Bayer process red mud is reduced,

[0076] The second type of auxiliary agent is a mixture of sodium hydroxi...

Embodiment 3

[0086] In this example, Fe in the Bayer process red mud 2 o 3 The mass content is 58%, comprises the following steps:

[0087] (1) drying and crushing after washing the Bayer red mud, so that the particle size of the broken Bayer red mud is 40 microns;

[0088] (2) Mix the crushed Bayer process red mud with the first type of auxiliary agent, the second type of auxiliary agent and the catalytic auxiliary agent to make the mixture raw meal,

[0089]Among them, the first type of auxiliary agent is a mixture of graphite, lignite and returned sintered material (the mass ratio of the three substances is 3:5:2), including 75% of the first type of auxiliary agent with a particle size of 60 microns by weight percentage. additives and 25% of the first type of additives with a particle size of 2 microns, the amount of the first type of additives is 1.6 times the theoretical carbon content required after all the iron oxide in the Bayer process red mud is reduced,

[0090] The second ty...

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Abstract

The invention relates to a method for producing sponge iron co-production sodium aluminate solution by using Bayer process red mud. The method comprises the following steps of: washing the Bayer process red mud, and then drying and crushing the washed Bayer process red mud; mixing the crushed Bayer process red mud with a first type auxiliary agent, a second type auxiliary agent and a catalytic auxiliary agent so as to prepare a mixed green stock; sintering the mixed green stock to prepare a high-temperature sintered clinker; performing dry magnetic separation on the high-temperature sintered clinker, and then grinding the high-temperature sintered clinker to obtain a magnetic material and a first type non-magnetic material; performing dissolution reaction on the magnetic material and a carbon content mother liquor which is obtained by decomposing the sodium aluminate solution in an alumina refinery to obtain the sodium aluminate solution and a ferruginous filter cake; and performing wet magnetic separation on the ferruginous filter cake to obtain a magnetic sponge iron and a second type non-magnetic material. The method for producing the sponge iron co-production sodium aluminate solution by using the Bayer process red mud uses waste materials generated in an alumina production process, changes the waste materials into valuable, and reduces pollutions to the environment because of the deposition of the red mud.

Description

technical field [0001] The invention relates to a method for producing sponge iron co-production sodium aluminate solution, in particular to a method for producing sponge iron co-production sodium aluminate solution using Bayer process red mud. Background technique [0002] Red mud is the waste produced in the process of extracting alumina from bauxite. It is named for its red mud. With the continuous development of the aluminum industry, the world currently produces about 60 million tons of red mud every year, and the discharge of red mud in my country is more than 4.5 million tons per year. Most of the alumina plants in the world pile up or pour red mud into the deep sea. The storage of red mud not only takes up a lot of land and farmland, but also consumes more yard construction and maintenance costs, and the remaining lye in the red mud goes to the sea. Underground seepage, causing groundwater pollution. In addition, the dust formed by the red mud in the storage yard i...

Claims

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Application Information

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IPC IPC(8): C21B13/00C01F7/04
Inventor 高建阳李文成鹿中科周晓燕陈玉海张爱民郑霞
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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