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Method for separating Fe2O3 from circulating fluidized bed fly ash

A circulating fluidized bed and fly ash technology, applied in chemical instruments and methods, iron oxide/iron hydroxide, magnetic separation, etc., can solve the problems of poor implementation effect of iron oxide, low recovery rate of iron oxide, and limitation of process conditions, etc. problems, to achieve the effect of broadening the scope of comprehensive utilization, large processing capacity, and simple production process

Inactive Publication Date: 2016-06-15
ZHUO DA NEW MATERIAL TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] At present, scholars at home and abroad have proposed some methods for separating and extracting iron oxide from fly ash, such as: calcium oxide sintering method, soda lime sintering method, etc., but these methods are limited by technological conditions, low iron oxide recovery rate, and energy consumption. Large size, high production cost, large amount of slag discharge, etc., resulting in poor implementation effect of separation and extraction of iron oxide

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  • Method for separating Fe2O3 from circulating fluidized bed fly ash

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Effect test

Embodiment 1

[0031] Example 1, after 3 times of magnetic separation, the fly ash was mixed with 5% nitric acid at a solid-to-liquid ratio of 1:3, and reacted at 80°C for 4 hours; after the reaction was completed and cooled to room temperature, the filter cake was obtained by suction filtration, And wash with water with a solid-to-liquid ratio of fly ash to water of 2:1 to obtain a solution of ferric nitrate and aluminum nitrate; add acetone according to the volume ratio of acetone to ferric nitrate and aluminum nitrate solution as 1:1, and then press oxidation The molar ratio of aluminum to ammonium nitrate is 1:3. Add ammonium nitrate to prepare a mixed solution. After stirring for 2 hours, filter with suction to obtain aluminum nitrate filter cake; Wash with acetone, and recover the filtrate; add ammonia water to the recovered filtrate dropwise until the pH of the solution is >8, and filter to obtain ferric hydroxide.

Embodiment 2

[0032] Example 2, after 4 times of magnetic separation, the fly ash was mixed with 4% nitric acid at a solid-to-liquid ratio of 1:4, and reacted at 70°C for 3 hours; after the reaction was completed and cooled to room temperature, the filter cake was obtained by suction filtration, And wash with water with a solid-to-liquid ratio of fly ash to water of 1:2 to obtain a solution of ferric nitrate and aluminum nitrate; add acetone according to the volume ratio of acetone to ferric nitrate and aluminum nitrate solution as 2:1, and then oxidize The molar ratio of aluminum to ammonium nitrate is 1:4, add ammonium nitrate to prepare a mixed solution, stir for 1 hour, and filter with suction to obtain an aluminum nitrate filter cake; Wash with acetone, and recover the filtrate; add ammonia water to the recovered filtrate dropwise until the pH of the solution is >8, and filter to obtain ferric hydroxide.

Embodiment 3

[0033] Example 3, after five times of magnetic separation, the fly ash was mixed with 3% nitric acid at a solid-to-liquid ratio of 1:5, and reacted at 60°C for 3 hours; after the reaction was completed and cooled to room temperature, the filter cake was obtained by suction filtration, And wash with water with a solid-to-liquid ratio of fly ash to water of 2:1 to obtain a solution of ferric nitrate and aluminum nitrate; add acetone according to the volume ratio of acetone to ferric nitrate and aluminum nitrate solution at a volume ratio of 3:1, and then oxidize The molar ratio of aluminum to ammonium nitrate is 1:3, add ammonium nitrate to prepare a mixed solution, stir for 1.5 hours, and filter with suction to obtain aluminum nitrate filter cake; Wash with water and acetone, and recover the filtrate; add ammonia water to the recovered filtrate dropwise until the pH of the solution is greater than 8, and filter to obtain ferric hydroxide.

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Abstract

The invention provides a method for separating Fe2O3 from circulating fluidized bed fly ash. According to the method, all Fe2O3 and FeO and part of amorphous Al2O3 in the fly ash are dissolved out through a low-temperature hydrothermal reaction of HNO3 and the fly ash, and then high-purity Fe2O3 is obtained by separating and extracting Fe2O3 and FeO from the solution through acetone. The method has no special requirement for equipment, adopts the low-temperature reaction and can separate and extract Fe2O3 from the fly ash efficiently; with adoption of the method, 90%-96% of Al2O3 in the fly ash can be dissolved out, and 98%-100% of Fe2O3 can be dissolved out; according to the technical scheme, the fly ash resource can be used sufficiently, a manufacture process is simple, the production cost is low, and the method is applicable to large-scale production.

Description

technical field [0001] The invention relates to a resource utilization method of fly ash, in particular to a method for separating iron oxide from fly ash in a circulating fluidized bed. Background technique [0002] Coal-fired power generation is one of the power production methods commonly used in countries all over the world, and the effective utilization of a large amount of fly ash produced by coal-fired coal has become a worldwide issue. At present, more than 70% of my country's electricity is generated by coal-fired power generation, and about 30% of the country's coal output is used for power generation. If the resulting fly ash is not utilized enough, it will not only occupy a large amount of land, but also cause serious environmental pollution. It is also a waste of resources. [0003] Due to the low-temperature cycle sintering characteristics of fluidized bed fly ash, circulating fluidized bed ash cannot form a glass phase, resulting in relatively low activity. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/02C01G49/08B03C1/00C01F7/66
CPCC01G49/02B03C1/00C01F7/66C01G49/08C01P2004/32C01P2004/61
Inventor 杨卓舒张磊邝清林
Owner ZHUO DA NEW MATERIAL TECH GRP