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Method for dissolving out aluminum from pulverized fuel ash

A technology of fly ash and aluminum solution, applied in aluminum chloride, aluminum halide, alumina/aluminum hydroxide, etc., can solve the problems of high capital construction investment of pressurized dissolution equipment, low aluminum dissolution rate, and high operating cost, and achieve The effect of high aluminum dissolution rate, improving economic benefits and reducing infrastructure investment

Inactive Publication Date: 2017-05-10
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, an object of the present invention is to propose a kind of method that dissolves aluminum from fly ash, to solve the low aluminum dissolution rate of the normal pressure stripping method in the prior art, the high capital investment of the pressurized stripping equipment, and the high operating cost The problem

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  • Method for dissolving out aluminum from pulverized fuel ash
  • Method for dissolving out aluminum from pulverized fuel ash
  • Method for dissolving out aluminum from pulverized fuel ash

Examples

Experimental program
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Effect test

Embodiment 1

[0055] A circulating fluidized bed fly ash (see Table 1 for the main components) was mixed with 28% concentration of hydrochloric acid for normal pressure dissolution treatment to obtain a stripped pulp; a thickener was used to concentrate the stripped pulp to obtain the first aluminum chloride-containing The stripping liquid and concentrated pulp; the concentrated stripping pulp is mixed with 28% hydrochloric acid for pressure stripping, and oxygen (99% purity) and steam (200°C) are introduced into the stripping process; solid-liquid separation is carried out after pressurized stripping The second eluate containing aluminum chloride and the eluate slag are obtained; the first eluate and the second eluate are combined to obtain the eluate containing aluminum chloride. Among them, the solid-liquid ratio of normal pressure dissolution is 1:1.3, the normal pressure dissolution temperature is 95 degrees Celsius, the dissolution time is 2 hours, and the end point acidity is 10.3g / L;...

Embodiment 2

[0061] A circulating fluidized bed fly ash (see Table 1 for the main components) was mixed with 28% concentration of hydrochloric acid for normal pressure dissolution treatment to obtain a stripped pulp; a thickener was used to concentrate the stripped pulp to obtain the first aluminum chloride-containing The stripping liquid and concentrated pulp; the concentrated stripping pulp is mixed with 28% hydrochloric acid for pressure stripping, and oxygen (99% purity) and steam (200°C) are introduced into the stripping process; solid-liquid separation is carried out after pressurized stripping The second eluate containing aluminum chloride and the eluate slag are obtained; the first eluate and the second eluate are combined to obtain the eluate containing aluminum chloride. Among them, the solid-liquid ratio of normal pressure dissolution is 1:1.5, the normal pressure dissolution temperature is 103 degrees Celsius, the dissolution time is 3 hours, and the terminal acidity is 10.4g / L;...

Embodiment 3

[0066] A circulating fluidized bed fly ash (see Table 1 for the main components) was mixed with 28% concentration of hydrochloric acid for normal pressure dissolution treatment to obtain a stripped pulp; a thickener was used to concentrate the stripped pulp to obtain the first aluminum chloride-containing The stripping liquid and concentrated pulp; the concentrated stripping pulp is mixed with 28% hydrochloric acid for pressure stripping, and oxygen (99% purity) and steam (200°C) are introduced into the stripping process; solid-liquid separation is carried out after pressurized stripping The second eluate containing aluminum chloride and the eluate slag are obtained; the first eluate and the second eluate are combined to obtain the eluate containing aluminum chloride. Among them, the solid-liquid ratio of normal pressure dissolution is 1:1.7, the normal pressure dissolution temperature is 103 degrees Celsius, the dissolution time is 3 hours, and the terminal acidity is 14.8g / L;...

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Abstract

The invention discloses a method for dissolving out aluminum from pulverized fuel ash. The method comprises the following steps of mixing the pulverized fuel ash with hydrochloric acid, and carrying out normal-pressure dissolving-out treatment on an obtained first mixture, so as to obtain first slurry; carrying out thickening separation treatment on the first slurry, so as to obtain concentrated slurry and a first aluminum-containing solution; mixing the concentrated slurry with the hydrochloric acid, and carrying out pressurized dissolving-out treatment on an obtained second mixture, so as to obtain second slurry; carrying out solid-liquid separation treatment on the second slurry, so as to obtain a second aluminum-containing solution; merging the first aluminum-containing solution and the second aluminum-containing solution. By adopting the method, the higher aluminum dissolving-out rate can be obtained; meanwhile, the quantity or the specification of pressurizing devices can be obviously decreased, so as to dramatically decrease the investment of capital construction; the economic benefit of a project is improved.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, in particular, the invention relates to a method for dissolving aluminum from fly ash. Background technique [0002] There are large-scale coal-fired power plants built in Northwest my country, which produce a large amount of fly ash. At present, they are generally stored as industrial waste residues or treated as road paving and building materials with low industrial value. Fly ash mainly contains alumina and silicon oxide, both of which account for more than 80%, and the metal aluminum in it contains high utilization value. [0003] Most of the fly ash produced by traditional coal-fired power plants is pulverized coal furnace fly ash. Due to its high combustion temperature (1400-1600°C), the stability of the alumina component in it is very high. For pulverized coal furnace fly ash, limestone sintering method, sodium carbonate sintering method and acid method are usually used to extract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/56C01F7/02
CPCC01F7/02C01F7/56
Inventor 殷书岩李少龙傅建国陆业大丁淑荣赵鹏飞张晓涛池文荣
Owner CHINA ENFI ENGINEERING CORPORATION