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Method for separating iron oxide in coal-powder boiler fly ash

A technology for fly ash and iron oxide, which is applied in the field of separating iron oxide from fly ash of a pulverized coal furnace, can solve the problems of poor implementation effect of iron oxide, low recovery rate of iron oxide, limitation of process conditions, etc., and achieves widening and comprehensive utilization. The effect of large scope, large processing capacity and simple production process

Inactive Publication Date: 2016-05-25
ZHUO DA NEW MATERIAL TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 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 iron oxide in coal-powder boiler fly ash

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Effect test

Embodiment 1

[0032] Example 1, after 4 times of magnetic separation, the fly ash was mixed with 5% phosphoric acid at a solid-to-liquid ratio of 1:2, and reacted at 130°C for 5 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 iron phosphate and aluminum phosphate; add acetone according to the volume ratio of acetone to iron phosphate and aluminum phosphate solution at a volume ratio of 3:1, and stir for 5 minutes , suction filtration to obtain aluminum phosphate filter cake, and reclaim the filtrate; mix aluminum phosphate filter cake with 70% acetone aqueous solution at a ratio of 1:3, stir for 15 minutes, then suction filter to obtain aluminum phosphate 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...

Embodiment 2

[0033] Example 2, after 3 times of magnetic separation, the fly ash was mixed with 8% phosphoric acid at a solid-to-liquid ratio of 1:3, and reacted at 120°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 phosphate and aluminum phosphate; add acetone according to the volume ratio of acetone to iron phosphate and aluminum phosphate solution at 2:1, and stir for 3 minutes , filtered with suction to obtain an aluminum phosphate filter cake, and reclaim the filtrate; mix the aluminum phosphate filter cake with 60% acetone aqueous solution at a ratio of 1:5, stir for 30 minutes, and then filter with suction to obtain an aluminum phosphate filter cake, and recover Filtrate: repeat this acetone aqueous solution washing process 4 times, and recover the filtrate; mix the hydrogen peroxide and the recov...

Embodiment 3

[0034] Example 3, after three times of magnetic separation, the fly ash was mixed with 3% phosphoric acid at a solid-to-liquid ratio of 1:2, and reacted at 150°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 iron phosphate and aluminum phosphate; add acetone according to the volume ratio of acetone to iron phosphate and aluminum phosphate solution at a volume ratio of 1:1, and stir for 5 minutes , filtered with suction to obtain an aluminum phosphate filter cake, and reclaim the filtrate; mix the aluminum phosphate filter cake with 50% acetone aqueous solution at a ratio of 1:2, stir for 10 minutes, and then filter with suction to obtain an aluminum phosphate filter cake, and recover Filtrate: repeat the washing process with acetone aqueous solution 6 times, and recover the filtrate; mix hydrogen ...

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Abstract

The invention provides a method for separating iron oxide in coal-powder boiler fly ash. In the method, through a low-temperature hydrothermal reaction between phosphoric acid and fly ash, all Fe2O3 and FeO and some amorphous-state Al2O3 in the fly ash are dissolved out; and Fe2O3 and FeO in the solution are separated and extracted using acetone to obtain high-purity iron oxide. The method provided by the invention imposes no special requirements on equipment, adopts low-temperature reaction and can be used for efficiently separating and extracting iron oxide in fly ash. By adopting the method, 90-96% of aluminum oxide in the fly ash can be dissolved out, and 98-100% of iron oxide can be dissolved out; and the technical solution provided by the invention makes full use of the fly ash resource and has the advantages of simple production technology and low production cost and 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 of a pulverized coal furnace. 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] From another point of view, fly ash is rich in various oxides, such as Al 2 o 3 , SiO 2 , Fe 2 o 3 , FeO, CaO, MgO, SO 3 , Na 2 O, K 2 O, etc., in addition to containing a smal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/02C01G49/08C01B25/36
CPCC01G49/02C01B25/36C01G49/08
Inventor 杨卓舒张磊邝清林
Owner ZHUO DA NEW MATERIAL TECH GRP