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Lime slaking process for alumina production

A technology of alumina and lime, applied in the direction of alumina/aluminum hydroxide, etc., can solve problems such as increased alumina consumption and alkali consumption, hindering the dissolution of diaspore, and slow decomposition of hydrated garnet, etc., to achieve Effects of increasing effective production capacity, reducing red mud output rate, and increasing saturation coefficient

Inactive Publication Date: 2007-01-03
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

During the dissolution process, the well-crystallized hydrated garnet decomposes slowly, that is, the activity of lime decreases, and calcium oxide cannot completely and timely react with titanium minerals, resulting in titanium minerals wrapping on the surface of diaspore to form titanic acid The sodium protective film hinders the dissolution of diaspore, which deteriorates the dissolution index, and the A / S of red mud is high, which leads to the increase of mineral consumption and alkali consumption in alumina production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] With 30℃, Al 2 o 3 : 55g / l, SiO 2 : The aluminum hydroxide lotion of 0.42g / l digests industrial lime, and the solid content of the milk of lime after deslagging is 322g / l, and the raw ore pulp is prepared by using this milk of lime and the pulp after grinding, and after 8 hours of pretreatment After desiliconization, under the conditions of dissolution temperature 260°C, time 60min, dissolution liquid Nk 210g / l, conventional high-pressure dissolution was carried out, and the obtained red mud A / S was 1.46, and N / S was 0.21.

Embodiment 2

[0023] With 52℃, Al 2 o 3 : 79g / l, SiO 2 : 0.46g / l aluminum hydroxide lotion to digest industrial lime, the solid content of the milk of lime after deslagging is 179g / l, use this milk of lime, the concentrate obtained through flotation, and circulating lye to prepare and dissolve the raw ore slurry , pre-desilication and stripping conditions are the same as in Example 1, and the obtained stripping red mud has an A / S of 1.48 and an N / S of 0.19.

Embodiment 3

[0025] With 92℃, Al 2 o 3 : 58g / l, SiO 2 : 0.45g / l primary red mud washing liquid to digest industrial lime, the solid content of the milk of lime after deslagging is 285g / l, use this milk of lime, the concentrate obtained through flotation, and circulating lye to prepare and dissolve the raw ore slurry , pre-desilication and stripping conditions are the same as in Example 1, stripped red mud A / S is 1.52, N / S is 0.07.

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Abstract

The present invention relates to alumina producing technology, and is especially lime slaking process for producing alumina through Bayer process with diaspore type bauxite as material. The present invention features that lime is slaked with low concentration solution of Al2O3<80 g / L and SiO2<0.8 g / L. The lime slaking process can raise activity of lime, raise SiO2 saturation coefficient of red mud leaching calcium silica slag, lower the mineral consumption and alkali consumption in alumina production, low production cost, lower red mud discarding rate and raise apparatus capacity.

Description

technical field [0001] The invention discloses a lime digestion method in alumina production, relates to alumina production technology, and is particularly suitable for the lime digestion production process of alumina production by Bayer process using diaspore type bauxite as raw material. Background technique [0002] The methods of industrial production of alumina mainly include Bayer method, sintering method and hybrid method. The Bayer method has the characteristics of simple production process, low energy consumption, low production cost, good product quality and high purity. For economic considerations, diaspore-type bauxite is generally produced by sintering method or hybrid method, which has complex technological process, high consumption, low product quality and difficult process control. [0003] In order to reduce production costs and improve the quality of alumina products, at present, the development and application of alumina production methods based on the Ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 郝红杰黄昂郭刚赵东峰李培增陆维和晏华钎王新武王海军幺海青胡少伟尹海军
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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