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Method for producing aluminum oxide by using alkaline method

An alumina and alkali process technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of large material flow, high energy consumption, poor technical economy, etc., and achieve small material flow, low energy consumption, and solid residue volume less effect

Inactive Publication Date: 2013-06-05
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The soda lime sintering method is an effective method for processing low-grade bauxite. It has the advantages of high recovery rate of alumina and low alkali consumption, but its technical economy is poor due to large material flow and high energy consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The raw material is bauxite from a certain place, the main chemical composition is Al 2 o 3 56%, SiO 2 22%, the ground fineness is -80 mesh limestone powder and sodium carbonate and evaporated carbonation decomposition mother liquor according to CaO and SiO 2 The molar ratio of 1.1, Na 2 O and Al 2 o 3 + Fe 2 o 3 The molar ratio is 1.4 to control the ingredients to prepare raw meal; burn the raw meal slurry at a temperature of 1200°C to obtain qualified clinker; use the adjusting liquid to leach the clinker under the condition of 80-90°C, and the alumina in the clinker The leaching rate was 86%, and the leaching rate of sodium oxide in clinker was 81%.

[0040] The concentration of caustic alkali for the solid phase residue after the clinker is dissolved is Na 2 o K 30g / L lye was leached for 300 minutes at a temperature of 95°C, the leaching liquid-solid ratio was 3, and Al in the solid phase residue 2 o3 The leaching rate is 19%, the Na in the solid phase...

Embodiment 2

[0042] The raw material is bauxite from a certain place, the main chemical composition is Al 2 o 3 55.21%, SiO 2 15.28%, the ground fineness is -80 mesh lime powder and sodium carbonate and evaporated carbonation decomposition mother liquor according to CaO and SiO 2 The molar ratio of 1.2, Na 2 O and Al 2 o 3 + Fe 2 o 3 The molar ratio is 1.6 to control the ingredients to prepare raw meal; burn the raw meal slurry at a temperature of 1220°C to obtain qualified clinker; use the adjusting liquid to leach the clinker under the condition of 75-95°C, and the alumina in the clinker The leaching rate can reach 91%, and the leaching rate of sodium oxide in clinker is 83%.

[0043] The concentration of caustic alkali for the solid phase residue after the clinker is dissolved is Na 2 o K 100g / L lye was leached for 240 minutes at a temperature of 95°C, the leaching liquid-solid ratio was 5, and Al in the solid phase residue 2 o 3 The leaching rate is 21%, the Na in the so...

Embodiment 3

[0045] The raw material is white nepheline syenite (the main chemical composition is Al 2 o 3 23.21%, SiO 2 55.90%), the ground fineness is -80 mesh limestone powder and sodium carbonate and evaporated carbonation decomposition mother liquor according to CaO and SiO 2 The molar ratio is 1.0, Na 2 O and Al 2 o 3 + Fe 2 o 3 The molar ratio of the raw material is 2.0 to control the ingredients to prepare raw meal; the raw material slurry is fired at a temperature of 1230°C to obtain qualified clinker; the clinker is leached with an adjustment solution at a temperature of 80-90°C, and alumina in the clinker The leaching rate is 83%, and the leaching rate of sodium oxide in clinker is 79%. .

[0046] The concentration of caustic alkali for the solid phase residue after the clinker is dissolved is Na 2 o K 120g / L, α k The sodium aluminate solution of 10.5 was leached for 120 minutes at a temperature of 90°C, the leaching liquid-solid ratio was 7, and the Al in the so...

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PUM

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Abstract

The invention discloses a method for producing an aluminum oxide by using an alkaline method. The method is characterized in that the production process comprises the following steps of: (1) adding lime and sodium carbonate into aluminum-containing mineral so as to prepare into a raw material; (2) sintering so as to prepare into clinker; (3) carrying out alkaline leaching on the clinker; (4) carrying out desilicication refining on the lixivium; (5) carrying out carbonation decomposition on the refined liquid; (6) roasting aluminum oxide; (7) carrying out alkaline leaching on the solid phase residue obtained in the step (3) and subsequently carrying out liquid-solid separation; (8) dealuminizing the lixivium; (9) using the dealuminized residue as the desilicication seed crystal in the step (4); (10) using the dealuminized liquid in the step (8) for circulation leaching and blending the dealuminized liquid with the lixivium obtained in the step (3), or using the dealuminized liquid as an evaporation stoste; and (11) using the obtained solid phase residue as raw materials of cement or other building materials. The method disclosed by the invention has the characteristics of low consumption and high aluminum oxide recycling rate; and the residue can be directly used as raw materials for producing cement or other building materials.

Description

technical field [0001] The invention discloses a method for producing alumina by an alkali process, which relates to an improvement of a process for producing alumina by using aluminum-containing minerals such as bauxite, Bayer process red mud, nepheline, alunite and kaolinite. Background technique [0002] In 1858, Le Chatelier of France proposed to sinter bauxite with sodium carbonate. After the sintered product was dissolved, the obtained sodium aluminate solution was decomposed by carbon dioxide gas, and aluminum hydroxide was precipitated, and then the aluminum hydroxide was calcined. Alumina, the first alumina was produced in 1860. In some documents of Western countries at that time, the sintering method was called Lu Chadri method. When using this method to treat bauxite with high silica content, the loss of alumina and alkali is very large. In 1880, Muller (G. Muller) proposed adding limestone to the sintering batch to reduce the loss of alumina and alkali. In 190...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 李旺兴尹中林杨志民吴拓宇
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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