Method for separating Fe2O3 in pulverized coal ash of circulating fluidized bed

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

Inactive Publication Date: 2016-07-20
ZHUO DA NEW MATERIAL TECH GRP
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  • Abstract
  • Description
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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 in pulverized coal ash of circulating fluidized bed

Examples

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Effect test

Embodiment 1

[0033] Example 1, the fly ash was subjected to 4 times of magnetic separation, then mixed with 5% sulfuric acid at a solid-to-liquid ratio of 1:1, 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 1:1 to obtain a solution of ferric sulfate and aluminum sulfate; prepare acetone at a volume ratio of 3:1 to the solution of ferric sulfate and aluminum sulfate, add acetone, and stir for 5 minutes , suction filtration to obtain aluminum sulfate filter cake, and reclaim the filtrate; mix aluminum sulfate filter cake with 70% acetone aqueous solution at a ratio of 1:3, stir for 15 minutes, and suction filter to obtain aluminum sulfate filter cake, and recycle Filtrate: Repeat the washing process with acetone aqueous solution for 6 times, and recover the filtrate; mix hydrogen peroxide and recovered filtrate at a volu...

Embodiment 2

[0034] Example 2, after 3 times of magnetic separation, the fly ash was mixed with 10% sulfuric acid at a solid-to-liquid ratio of 1:3, and reacted at 90°C for 6 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 iron sulfate and aluminum sulfate; prepare acetone at a volume ratio of acetone to iron sulfate and aluminum sulfate solution of 2:1, add acetone, and stir for 3 minutes , suction filtration to obtain aluminum sulfate filter cake, and reclaim the filtrate; mix aluminum sulfate filter cake with 60% acetone aqueous solution at a ratio of 1:5, stir for 30 minutes, and suction filter to obtain aluminum sulfate filter cake, and recycle Filtrate: repeat this acetone aqueous solution washing process 4 times, and recover the filtrate; mix the hydrogen peroxide and the recovered filtrate at a volume ratio of...

Embodiment 3

[0035]Example 3, after 3 times of magnetic separation, the fly ash was mixed with 1% sulfuric acid at a solid-to-liquid ratio of 1:3, and reacted at 60°C for 6 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 iron sulfate and aluminum sulfate; prepare acetone according to the volume ratio of acetone to iron sulfate and aluminum sulfate solution of 1:1, add acetone, and stir for 5 minutes , filtered with suction to obtain an aluminum sulfate filter cake, and reclaim the filtrate; mix the aluminum sulfate filter cake with 50% acetone aqueous solution at a ratio of 1:2, stir for 10 minutes, and then suction filter to obtain an aluminum sulfate filter cake, and recycle Filtrate: repeat the washing process with acetone aqueous solution 6 times, and recover the filtrate; mix hydrogen peroxide and recovered filtr...

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Abstract

The method provides a method for separating Fe2O3 in pulverized coal ash of a circulating fluidized bed.The method includes the steps that sulfuric acid and pulverized coal ash are subjected to a low-temperature hydrothermal reaction so that all Fe2O3 and FeO and part of amorphous Al2O3 in pulverized coal ash can be dissolved out; then, Fe2O3 and FeO in the solution are separated and extracted with acetone to obtain high-purity Fe2O3.According to the method, no special requirement for equipment exists, only the low-temperature reaction is needed, and Fe2O3 in pulverized coal ash can be efficiently separated and extracted; Al2O3 in pulverized coal ash can be dissolved out by 90%-96%, and Fe2O3 in pulverized coal ash can be dissolved out by 98%-100%.By means of the technical scheme, the resource of pulverized coal ash is fully utilized, the manufacturing process is simple, the production cost is low, and the method is suitable for 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): C01G49/06
CPCC01G49/06
Inventor 杨卓舒张磊邝清林
Owner ZHUO DA NEW MATERIAL TECH GRP
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