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Method for separating useful components from bayer process red mud

A Bayer process red mud, a useful technology, applied in the field of comprehensive utilization of red mud, can solve the problems of unreachable industrial production, increased slag viscosity, high iron and alkali content, etc., and achieve the effect of simple process, easy industrialization, and realization of industrialization

Active Publication Date: 2014-03-05
潘爱芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Up to now, there is no effective industrialized treatment method at home and abroad. Even in the past, developed countries mostly discharged it into the sea, which has become a worldwide environmental protection problem.
[0003] Since the 1940s, many countries have proposed dozens of methods for the comprehensive utilization of Bayer red mud, but most of them have not met the requirements of industrial production, mainly because this type of red mud is not easy to dry, and dehydration consumes more energy. Large, and because of the high content of iron and alkali, it is not conducive to the manufacture of cement
If it is used for ironmaking, the alkali in it will corrode the refractory material of the furnace lining, and the titanium oxide in the red mud will also increase the viscosity of the slag, making it difficult to operate the blast furnace, etc.

Method used

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  • Method for separating useful components from bayer process red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] In the step (1): the water content of the red mud slurry is 36%.

[0049] In the step (2): roasting at 800° C. for 30 minutes to obtain roasted clinker.

[0050] In the step (3): water is added to the calcined clinker obtained in the step (2) at a solid-to-liquid ratio of 1:6, and leached at a temperature of 60°C for 10 minutes; and filtered after leaching to obtain The secondary filtrate and the primary filter residue; the obtained secondary filtrate is recycled for leaching the roasted clinker obtained in step (2).

[0051] In the step (4): add 4mol / L industrial sulfuric acid to the first filter residue obtained in step (3), and make the solid-liquid mass ratio 1:4; filter to obtain the second filter residue and the third filtrate; the third filtrate Contains silicon, aluminum and iron; the second filter residue is washed to obtain calcium sulfate product.

[0052] In the step (5): the three filtrates obtained in the step (4) are kept at a temperature of 60° C. for ...

Embodiment 2

[0057] In the step (1): the water content of the red mud slurry is 46%.

[0058] In the step (2): roasting at a temperature of 990° C. for 60 minutes to obtain roasted clinker.

[0059] In the step (3): water is added to the calcined clinker obtained in the step (2) at a solid-to-liquid ratio of 1:50, and leached for 30 minutes at a temperature of 80° C.; and filtered after leaching to obtain The secondary filtrate and the primary filter residue; the obtained secondary filtrate is recycled for leaching the roasted clinker obtained in step (2).

[0060] In the step (4): add 10mol / L industrial sulfuric acid to the first filter residue obtained in step (3), and make the solid-liquid mass ratio 1:20; filter to obtain the second filter residue and the third filtrate; the third filtrate Contains silicon, aluminum and iron; the second filter residue is washed to obtain calcium sulfate product.

[0061] In the step (5): filter the three filtrates obtained in the step (4) at a temper...

Embodiment 3

[0066] In the step (1): the water content of the red mud slurry is 40%.

[0067] In the step (2): roasting at 900° C. for 40 minutes to obtain roasted clinker.

[0068] In the step (3): add water to the roasted clinker obtained in the step (2) according to the ratio of solid to liquid ratio of 1:20, and leaching at a temperature of 70°C for 20 minutes; and filtering after leaching to obtain The secondary filtrate and the primary filter residue; the obtained secondary filtrate is recycled for leaching the roasted clinker obtained in step (2).

[0069] In the step (4): add 7mol / L industrial sulfuric acid to the first filter residue obtained in step (3), and make the solid-liquid mass ratio 1:10; filter to obtain the second filter residue and the third filtrate; the third filtrate Contains silicon, aluminum and iron; the second filter residue is washed to obtain calcium sulfate product.

[0070] In the step (5): the three filtrates obtained in the step (4) are kept at a tempera...

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Abstract

The invention discloses a method for separating useful components from bayer process red mud. The method comprises the following steps: settling separation of bayer process red mud; slurry roasting; water immersion; circulating acid leaching; aging for silicon purification; aluminum-iron separation and the like so as to obtain aluminum hydroxide, fine silica, iron powder, gypsum and other products. In the whole production process, all components in the bayer process red mud can be completely separated and transformed into products without adding raw materials except for sulfate, and zero discharge is realized. Compared with the conventional comprehensive utilization method of the bayer process red mud, the method not only can realize complete separation and utilization of various components, but also has the advantages of high separation and extraction rates of various components, simple technological process, no special requirements for equipment, low energy consumption, easiness in realization of industrialization and the like, thereby opening up a new way for the comprehensive utilization of the bayer process red mud.

Description

Technical field: [0001] The invention belongs to the technical field of comprehensive utilization of solid waste, and relates to a comprehensive utilization technology of solid waste discharged in the comprehensive production process of power generation, metallurgy and chemical industry, especially a kind of red mud discharged from the production of alumina by Bayer process Comprehensive utilization method. Background technique: [0002] Red mud is the polluting waste slag discharged when the aluminum industry extracts alumina. Generally, for every ton of alumina produced, 1.0 to 2.0 tons of red mud are incidentally produced. As the world's fourth largest producer of alumina, China discharges millions of tons of red mud every year. The stacking of a large amount of red mud not only occupies a large amount of land, but also causes serious pollution to the environment. Among them, red mud contains a large amount of strong alkaline chemical substances, and its pH value is sti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46C01B33/12C01F7/02C01G49/02B09B3/00
Inventor 潘爱芳马润勇马昱昭
Owner 潘爱芳
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