Method using alkaline process to extract alumina in coal ash

A technology of alkaline extraction and fly ash, which is applied in chemical instruments and methods, alumina/hydroxide preparation, inorganic chemistry, etc., can solve the problems of high energy consumption, large amount of slagging, and large amount of clinker, etc. Achieve the effects of small material flow, high output rate, and less solid residue

Active Publication Date: 2012-08-08
河南华慧有色工程设计有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large amount of clinker in the alkaline method, the energy consumption is too high, and the amount of slagging after alumina extraction is large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The raw material is fly ash from a thermal power plant, the main chemical composition is Al 2 o 3 39%, SiO 2 44.1%, the ground fineness is -80 mesh limestone powder or lime powder and sodium carbonate and evaporated carbonation decomposition mother liquor according to CaO and SiO 2 The molar ratio is 1.0 control, sodium carbonate (including the Na in the carbonation decomposition mother liquor after evaporation 2 O) The amount added is in accordance with Na 2 O and Al 2 o 3 + Fe 2 o 3 The molar ratio is 1.1 to control the ingredients to prepare raw slurry; burn the raw slurry at a temperature of 1110°C to obtain qualified clinker; use the adjusting liquid to leach the clinker under the condition of 80-90°C, and the clinker The leaching rate of alumina can reach 69.97%, and the leaching rate of sodium oxide in clinker can reach 70.46%. The clinker leachate is desiliconized and decomposed by carbonation to obtain aluminum hydroxide, which is roasted to obtain meta...

Embodiment 2

[0037] The raw material is fly ash from a thermal power plant, the main chemical composition is Al 2 o 3 41%, SiO 2 47%, the ground fineness is -80 mesh limestone powder or lime powder and sodium carbonate and evaporated carbonation decomposition mother liquor according to CaO and SiO2 The molar ratio is 1.3 control, sodium carbonate (including the Na in the carbonation decomposition mother liquor after evaporation 2 O) The amount added is in accordance with Na 2 O and Al 2 o 3 + Fe 2 o 3 The molar ratio is 1.0 to control the ingredients to prepare raw slurry; burn the raw 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 clinker The leaching rate of alumina can reach 77.76%, and the leaching rate of sodium oxide in clinker can reach 82.78%. The clinker leachate is desiliconized and decomposed by carbonation to obtain aluminum hydroxide, which is roasted to obtain metallur...

Embodiment 3

[0040] The raw material is fly ash from a thermal power plant, the main chemical composition is Al 2 o 3 47%, SiO 2 43%, the ground fineness is -80 mesh limestone powder or lime powder and sodium carbonate and evaporated carbonation decomposition mother liquor according to CaO and SiO 2 The molar ratio is 1.5 control, sodium carbonate (including Na in the carbonation decomposition mother liquor after evaporation 2 O) The amount added is in accordance with Na 2 O and Al 2 o 3 + Fe 2 o 3 The molar ratio is 1.2 to control the ingredients to prepare raw slurry; burn the raw slurry at a temperature of 1120°C to obtain qualified clinker; use the adjusting liquid to leach the clinker under the condition of 80-90°C, and the clinker The leaching rate of alumina can reach 84.97%, and the leaching rate of sodium oxide in clinker can reach 92.82%. The clinker leachate is desiliconized and decomposed by carbonation to obtain aluminum hydroxide, which is roasted to obtain metallurgi...

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PUM

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Abstract

A method using an alkaline process to extract alumina in coal ash relates to a method using coal ash to produce alumina and is characterized by comprising the steps of (1) manufacturing coal ash, limestone or lime into raw slurry with alkali liquid; (2) firing the raw slurry into clinker; (3) performing alkaline leaching on the clinker; (4) desiliconizing leaching liquid to perform liquid-solid separation; (5) carbonating and resolving desiliconized liquid after liquid-solid separation to obtain aluminium hydroxide; (6) roasting the aluminium hydroxide to achieve alumina; (7) performing alkaline leaching on solid phase residues obtained from the step (3); (8) using leaching liquid obtained from the step (7) to adjust molecular ratio of a system in desiliconization treatment; or adding lime in the leaching liquid obtained from the step (7), filtering after reaction, and obtaining filter residues which are used for desiliconization of the step (4). The method can be used for treating coal ash raw materials from different sources to produce alumina.

Description

[0001] technical field [0002] The invention relates to a method for extracting aluminum oxide in fly ash by alkaline method. Background technique [0003] Fly ash is a finely powdered material collected from the flue gas of coal combustion. The mineral composition and chemical composition of fly ash are related to the source of coal. Its phase composition is mainly vitreous, and it also contains mullite, quartz, hematite, magnetite, anhydrite, tricalcium phosphate and yellow feldspar, etc. Powdery material; the chemical composition is mainly Al 2 o 3 , SiO 2 , Fe 2 o 3 , CaO, MgO, etc., and also contains a small amount of rare elements. Fly ash storage will occupy a large amount of land, and will also cause a certain degree of pollution to the surrounding environment. Therefore, it is of great significance to study the comprehensive utilization of fly ash, turn waste into treasure, protect the environment, improve resource utilization, and build an environmentally f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30C04B7/24C01F7/0693C01F7/0613
CPCC04B28/02C04B7/24C01F7/0693C04B18/08C01F7/30C01F7/0613C22B7/04Y02P10/20Y02W30/91C04B20/023C04B20/04
Inventor 李旺兴尹中林杨志民吴拓宇
Owner 河南华慧有色工程设计有限公司
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