Method for separating iron oxide from fly ash of pulverized coal furnace

A technology of fly ash and iron oxide, which is applied in the direction of iron oxide/iron hydroxide, ferric oxide, aluminum chloride, etc., which can solve the problems of poor implementation effect of iron oxide, low recovery rate of iron oxide, and limitation of process conditions and other problems, to achieve the effect of broadening the scope of comprehensive utilization, large processing capacity, and simple production process

Inactive Publication Date: 2016-06-22
ZHUO DA NEW MATERIAL TECH GRP
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  • Abstract
  • Description
  • Claims
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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 from fly ash of pulverized coal furnace

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Effect test

Embodiment 1

[0032] Example 1, the fly ash was subjected to 4 times of magnetic separation, then mixed with 3% hydrochloric acid at a solid-to-liquid ratio of 1:3, and reacted at 90°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 1:1 to obtain a solution of iron hydrochloride and aluminum hydrochloride; add methanol according to the volume ratio of methanol to iron hydrochloride and aluminum hydrochloride solution at 5:1, and stir for 5 minutes , suction filtration to obtain aluminum hydrochloride filter cake, and reclaim the filtrate; mix aluminum hydrochloride filter cake with 80% methanol aqueous solution at a ratio of 1:3, stir for 15 minutes, and suction filter to obtain aluminum hydrochloride filter cake, and recycle Filtrate: Repeat this methanol water washing process for 6 times, and recover the filtrate; mix the hydrogen peroxid...

Embodiment 2

[0033] Example 2, after 3 times of magnetic separation, the fly ash was mixed with 5% hydrochloric acid at a solid-to-liquid ratio of 1:2, and reacted at 95°C for 2 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 hydrochloride and aluminum hydrochloride; prepare methanol at a volume ratio of 12:1 to the solution of iron hydrochloride and aluminum hydrochloride, add methanol, and stir for 3 minutes , suction filtration to obtain aluminum hydrochloride filter cake, and recycle the filtrate; mix aluminum hydrochloride filter cake with 70% methanol aqueous solution at a ratio of 1:5, stir for 30 minutes, and suction filter to obtain aluminum hydrochloride filter cake, and recycle Filtrate: Repeat this methanol water washing process 4 times, and recover the filtrate; mix the hydrogen peroxide and the reco...

Embodiment 3

[0034] Example 3, after 3 times of magnetic separation, the fly ash was mixed with 4% hydrochloric acid at a solid-to-liquid ratio of 1:4, and reacted at 100°C for 1 hour; 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 hydrochloride and aluminum hydrochloride; add methanol according to the volume ratio of methanol to ferric hydrochloride and aluminum hydrochloride solution as 8:1, and stir for 5 minutes , suction filtration to obtain aluminum hydrochloride filter cake, and reclaim the filtrate; mix aluminum hydrochloride filter cake with 90% methanol aqueous solution at a ratio of 1:2, stir for 10 minutes, and suction filter to obtain aluminum hydrochloride filter cake, and recycle Filtrate: Repeat this methanol water washing process for 6 times, and recover the filtrate; mix hydrogen peroxide and recove...

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Abstract

The invention provides a method for separating iron oxide from the fly ash of a pulverized coal furnace. In the method, through low-temperature hydrothermal reaction between hydrochloric acid and fly ash, all Fe2O3 and FeO and part of amorphous Al2O3 in the fly ash are dissolved out; and Fe2O3 and FeO are separated and extracted from the solution using methanol to obtain high-purity iron oxide. The method provided by the invention imposes no special requirements on equipment, adopts low-temperature reaction and can efficiently separate and extract iron oxide from the fly ash; 90-96% of aluminum oxide and 98-100% of iron oxide in the fly ash can be dissolved out; and in the technical scheme provided by the invention, the fly ash resource is fully utilized, the preparation technology 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 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): C01G49/02C01G49/08C01F7/56
CPCC01G49/02C01F7/56C01G49/08C01P2004/61
Inventor 杨卓舒张磊邝清林
Owner ZHUO DA NEW MATERIAL TECH GRP
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