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Method for preparing aluminum oxide from low aluminum-silicon ratio aluminum-containing mineral

A technology of aluminum-silicon ratio and alumina, which is applied in the fields of alumina/hydroxide preparation, aluminate/alumina/aluminum hydroxide purification, chemical instruments and methods, etc., can solve problems such as losses and process troubles, and achieve The effect of simple equipment and simple process flow

Inactive Publication Date: 2008-01-09
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the flotation process, the aluminum-containing concentrate contains organic flotation agents, which brings troubles to the subsequent process, and the flotation process will cause silica and a part of aluminum oxide in the raw ore to enter the tailings and be lost
The production of alumina from materials containing aluminum compounds and silicon compounds such as clay, kaolin or coal gangue has not been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The raw material is bauxite containing 33.6% alumina and the ratio of aluminum to silicon is less than 1, and its composition is calculated as SiO by mass percentage 2 49.7%, Al 2 o 3 33.6%, MgO 0.8%, Fe 2 o 3 1.2%, CaO 0.6%, impurity 1.1%, loss on ignition 13.0%.

[0034] Grind the low-grade bauxite to less than 10 μm, preheat to 200°C after magnetic separation and iron removal, add 90% concentrated sulfuric acid, the ratio of minerals to concentrated sulfuric acid is 1:1.5 by mass and volume, and heat at 330°C Under roasting reaction, after 2 hours of reaction, keep warm at 380°C for 2h to escape the remaining sulfuric acid, then lower the temperature to 200°C, add 5 times the volume of water, cook at 80°C for 40 minutes, and dissolve aluminum sulfate. Filtration, the filtered filtrate is aluminum sulfate solution, evaporated and crystallized to obtain Al 2 (SO 4 ) 3 18H 2 O, the filter residue is mainly silica.

[0035] Will Al 2 (SO 4 ) 3 18H 2 O is ...

Embodiment 2

[0042] The clay composition used is calculated as SiO by mass percentage 2 47.20%, Al 2 o 3 37.40%, Fe 2 o 3 0.68%, MgO 0.1%, CaO 0.36%, K 2 O 2.01%, impurity 0.22%, loss on ignition 12.03%.

[0043] Grind the clay to less than 10 μm, remove iron by magnetic separation, mix it with 90% concentrated sulfuric acid in a ratio of 1:5 by mass and volume, stir and leaching the clay in a heating mantle at a temperature of 220°C, and cool down to At 150°C, solid-liquid separation is carried out, the filtrate is water and the remaining sulfuric acid from the reaction, and the filter cake contains the product aluminum sulfate. Roast the filter cake at 380°C for 1 hour to decompose a small amount of sulfuric acid adsorbed in the filter cake and part of the sulfuric acid into SO 3 Escapes as a gas. Then cool down the filter cake, add 3 times the volume of water, and cook at 90°C for 30 minutes to dissolve aluminum sulfate. Filtration, the filtrate is aluminum sulfate solution, ...

Embodiment 3

[0050] The composition of kaolin used is calculated as SiO by mass percentage 2 51.25%, Al 2 o 3 33.75%, Fe 2 o 3 0.8%, impurity 0.2%, and the remainder is loss on ignition 14%.

[0051] Grind kaolin to less than 10 μm, add 95% concentrated sulfuric acid after magnetic separation to remove iron, the ratio of minerals to concentrated sulfuric acid is 1:4 by mass and volume, react at 180°C, and cool down to 100°C after 3 hours of reaction , using a suction filter for solid-liquid separation, the filtrate is water and the remaining sulfuric acid from the reaction, the filter residue contains silicon dioxide, the reaction product aluminum sulfate and impurities. Roast the filter residue at 370°C for 2 hours to decompose a small amount of sulfuric acid adsorbed in the filter residue and part of the sulfuric acid into SO 3Escapes as a gas. Then cool down the filter residue, add 2 times the volume of water, and cook at 60°C for 50 minutes to dissolve aluminum sulfate. Filtr...

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Abstract

This invention discloses a method for producing aluminium oxide by using aluminium-containg are with low aluminium / silicon ratio. The method comprises procedures of: (1), atomizing raw material ore; (2), dressing by magnetic separation; (3), acid treatment; (4), filtering and separation; (5), heating for dehydration decomposition; (6), recovering sulfur trioxide. After that, produced is the inventive product aluminium sesquioxide with high pureness upto 99.5%, meeting the standard of Non-Ferrous Metals Industries SY / T274-1998. The advantages of this invention are; full reutilization of materials, simple process, simple equipment, no discharge of wastes of solid, liquid and gas, no secondary pollution.

Description

technical field [0001] The invention relates to the technical field of extraction metallurgy, in particular to a method for preparing alumina from aluminum-containing resources with a low aluminum-silicon ratio. Background technique [0002] There is a shortage of bauxite in my country, but there are large reserves of materials containing aluminum compounds and silicon compounds. For example, bauxite, clay, kaolin, coal gangue, etc. with low aluminum-silicon ratio. Their typical composition is as follows, the composition of bauxite with medium and low aluminum-silicon ratio is SiO in mass percentage 2 20%~60%, Al 2 o 3 30%~70%,TiO 2 0.1%~4%, Fe 2 o 3 0.1%~5%, MgO 0.1%~1%, CaO 0.1%~2%, K 2 O 0.01~5%, the rest is trace; the composition of clay is calculated as SiO by mass percentage 2 35%~80%, Al 2 o 3 15%~70%, Fe 2 o 3 0.1% to 10%, MgO 0.1% to 10%, CaO 0.1% to 10%, and trace amounts of the rest; the composition of kaolin is calculated as SiO by mass percent...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F7/26C01F7/32C01F7/46C01B17/775B03C1/02
Inventor 翟玉春吴艳李来时王佳东牟文宁管秀荣刘瑛瑛王瑞芹王海季芳
Owner NORTHEASTERN UNIV
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