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Application of additive for promoting dissolution of bauxite and adding equipment

An additive, bauxite technology, applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, aluminum compound, inorganic chemistry, etc., can solve the increase of alumina production cost, increase the amount of red mud and red mud washing Water volume, evaporative salt discharge increase and other issues, to achieve the effect of improving the dissolution rate of alumina, reducing the amount of production, and eliminating the impact

Pending Publication Date: 2021-12-10
国家电投集团山西铝业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Due to the production of hydrated garnet, the loss of alumina increases
[0006] 2. Significantly increase the amount of red mud and red mud washing water, and increase the burden of red mud sedimentation and washing, and at the same time cause the dilution of various valuable elements in red mud and the increase of energy consumption in the evaporation process
[0007] 3. Calcined lime inevitably contains calcium carbonate, and causticization occurs during the bauxite dissolution process, which increases the concentration of sodium carbonate in the system, resulting in an increase in evaporation and salt discharge, and an increase in causticization
[0008] 4. Due to the large amount of lime added and cannot be recycled, the production cost of alumina increases

Method used

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  • Application of additive for promoting dissolution of bauxite and adding equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, additive

[0029] This embodiment provides an additive for replacing lime and promoting the dissolution of alumina from bauxite. The additive consists of iron powder and ether cellulose.

[0030] In one example, in the additive, the mass ratio between iron powder and ether cellulose is (1:99)-(99:1). In one example of this example, the mass ratio between iron powder and ether cellulose is 1:1. In one example of this example, the mass ratio between iron powder and ether cellulose is 1:10. In one example of this example, the mass ratio between iron powder and ether cellulose is 1:20. In one example of this example, the mass ratio between iron powder and ether cellulose is 1:50. In one example of this example, the mass ratio between iron powder and ether cellulose is 10:1. In one example of this example, the mass ratio between iron powder and ether cellulose is 20:1. In one example of this example, the mass ratio between iron powder and ether cellulose ...

Embodiment 2

[0036] Embodiment 2, the addition equipment of additive

[0037] In order to add the additive prepared in Example 1 during the alumina production process, this example provides an adding device.

[0038] refer to figure 1 , the adding equipment includes a premix tank. Additives can be added to the premix tank, wherein the additive can be added to the premix tank at a rate of 1.1 tons / 4h. That is, the speed of adding additives to the premixing tank is: every 4 hours (h), add 1.1 tons (t) of additives.

[0039] The premixing tank communicates with the circulation mother liquor pipeline, so as to receive the circulation mother liquor from the circulation mother liquor pipeline (not shown). Among them, when the speed of adding additives to the premixing tank is 1.1 tons / 4h, the speed of circulating mother liquor pipeline to the premixing tank is 11m 3 / 4h. That is to add 11 cubic meters of circulating mother liquor to every 1.1 tons of additives.

[0040] The additive in the...

Embodiment 3

[0046] Embodiment 3, the adding process of additive

[0047] In the process of producing alumina by using diaspore type bauxite as raw material, the dosage of the additive is 0.1% of the dry ore mass of the diaspore type bauxite. In this proportion, additives in the form of solid powders can be added to the figure 1 Add a certain amount of circulating mother liquor to the premixing tank shown at the same time, and mix thoroughly by stirring and self-circulating pump. Among them, for every 1.1 tons of additives, 11 cubic meters of circulating mother liquor are added.

[0048] The premixed additive prepared in the premixing tank is pumped into the preparation tank (preparation tank A or preparation tank B) by the preparation pump. Add appropriate amount of circulating mother liquor to the preparation tank. Among them, 44 cubic meters of circulating mother liquor are added to the premixed additive prepared by every 1.1 tons of additive. Thus, an additive slurry with a solid c...

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Abstract

The invention relates to the technical field of aluminum oxide production, in particular to application of an additive for promoting dissolution of bauxite and and adding equipment. The additive comprises iron powder and ether cellulose. The additive can be used for replacing lime and promoting aluminum oxide to be dissolved out of bauxite. While normal high-pressure dissolution of the diasporic bauxite is ensured, the use amount of the lime in the process of producing the aluminum oxide by taking the diasporic bauxite as the raw material is reduced, so that the harm of the lime in the process of producing the aluminum oxide by taking the diasporic bauxite as the raw material is avoided or reduced.

Description

technical field [0001] The invention relates to the technical field of alumina production, in particular to the use of an additive for promoting the dissolution of bauxite and the addition equipment. Background technique [0002] The vast majority of China's bauxite is diaspore type bauxite, which has the characteristics of high aluminum and high silicon, and generally contains 2 to 4% titanium minerals. Among them, titanium minerals exist in the form of rutile, anatase and brookite. During the Bayer dissolution process of diaspore bauxite, titanium minerals will significantly reduce the dissolution rate of alumina, and the higher the content of titanium minerals in the ore and the more dispersed, the greater the effect on the dissolution of alumina. Big. [0003] At present, in order to eliminate the influence of titanium minerals on the dissolution of alumina, lime is added to the dissolution system. The amount of lime added is usually 10-20% of the bauxite. [0004] A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/06
CPCC01F7/0633
Inventor 廖鹏王一霖解晓阳李小斌齐天贵周秋生刘桂华彭志宏吴庆君刘文远杨伟李海东马志博王宽宽
Owner 国家电投集团山西铝业有限公司
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