A kind of method utilizing fly ash to prepare aluminum chloride

A technology of fly ash and crystalline aluminum chloride, applied in aluminum chloride, aluminum halide and other directions, can solve the problems of reduced equipment corrosion, low impurity content, equipment corrosion, etc., to reduce process energy consumption, high purity, high Efficiency transforms the effect of crystallization

Active Publication Date: 2021-07-02
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the problem that the existing method for preparing crystalline aluminum chloride by using fly ash seriously corrodes the equipment, and provides a method for preparing crystalline aluminum chloride by using fly ash, which can realize low energy consumption and high efficiency leaching powder Alumina in coal ash, and the corrosion degree of equipment in the whole process is significantly reduced, and crystalline aluminum chloride products with low impurity content can be produced

Method used

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  • A kind of method utilizing fly ash to prepare aluminum chloride
  • A kind of method utilizing fly ash to prepare aluminum chloride

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Take 1kg of fly ash ground to 100~200 mesh, add 0.6kg of water, mix thoroughly in a well-insulated 5L enamel tank, take 2kg of 98% concentrated sulfuric acid and add it to the enamel reaction kettle, seal the kettle body, and adjust the pressure to 0.3 MPa, temperature is 140°C, heat preservation reaction for 6h; when the pressure of the reaction kettle drops to atmospheric pressure, add 1.2kg of hot water at 90°C, filter it with a plate and frame filter press, put the obtained aluminum sulfate solution into an enamel evaporation tank; add Aluminum hydroxide adjusts the remaining acid, and after stabilization, the measured pH is 2.3. Use the residual heat of the solution and the neutralization heat released by aluminum hydroxide to evaporate and concentrate, and naturally cool to 30°C for separation to obtain crystalline aluminum sulfate; heat the aluminum sulfate at 80°C Dissolve in water, keep warm and stir for 3 hours, then cool to 50°C, stand still and filter to obta...

Embodiment 2

[0035] Take 1kg of fly ash ground to 100~200 mesh, add 1.5kg of water, mix thoroughly in a well-insulated 5L enamel tank, take 3kg of 98% concentrated sulfuric acid and add it to the enamel reaction kettle, seal the kettle body, and adjust the pressure to 0.4 MPa, temperature is 160°C, heat preservation reaction for 5h; when the pressure of the reaction kettle drops to atmospheric pressure, add 0.4kg of hot water at 90°C, filter it with a plate and frame filter press, put the obtained aluminum sulfate solution into an enamel evaporation tank; add Aluminum hydroxide adjusts the remaining acid, and after stabilization, the measured pH is 2.2. Use the residual heat of the solution and the neutralization heat released by aluminum hydroxide to evaporate and concentrate, and naturally cool to 30°C for separation to obtain crystalline aluminum sulfate; heat the aluminum sulfate at 80°C Dissolve in water, keep warm and stir for 3.5h, then cool to 55°C, stand still and filter to obtain ...

Embodiment 3

[0037]Take 20kg of fly ash ground to 100~200 mesh, add 20kg of water, mix thoroughly in a well-insulated 50L enamel reaction kettle, take 25kg of 98% concentrated sulfuric acid into the enamel kettle, seal the kettle body, and adjust the pressure to 0.45MPa , the temperature is 160°C, heat preservation reaction for 6h; when the pressure of the reaction kettle drops to atmospheric pressure, add 22kg of hot water at 90°C, filter it with a plate and frame press, put the obtained aluminum sulfate solution into an enamel evaporation tank; add aluminum hydroxide Adjust the remaining acid, and after stabilization, the measured pH is 2.1. Use the residual heat of the solution and the neutralization heat released by aluminum hydroxide to evaporate and concentrate, and naturally cool to 30°C to separate to obtain crystalline aluminum sulfate; dissolve the aluminum sulfate with hot water at 80°C, And keep stirring for 5 hours, then cool to 60°C, stand still, and filter to obtain refined a...

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Abstract

A method for preparing aluminum chloride from fly ash belongs to the technical field of comprehensive utilization of fly ash, and can solve the problem of serious corrosion of equipment by the existing method for preparing crystalline aluminum chloride from fly ash, comprising the following steps: The aluminum sulfate in the fly ash is leached by self-heating and self-pressing acid leaching with sulfuric acid to obtain an aluminum sulfate solution, and then crystallized under temperature control to obtain aluminum sulfate; the aluminum sulfate is reacted with ammonia water, and then reacted with hydrochloric acid to prepare crystalline aluminum chloride. This process can realize the low-energy-consumption and high-efficiency dissolution of alumina in the fly ash, and realize the low-energy-consumption and high-efficiency crystallization of aluminum chloride, and obtain a crystalline aluminum chloride product with a purity higher than 95%. The method makes full use of the dilution heat of sulfuric acid and the reaction heat of the process, the leaching process does not need an external heating source, the energy consumption of the process is significantly reduced, and the use of sulfuric acid leaching significantly reduces equipment corrosion, so that the overall cost of the technology is significantly reduced, and it is convenient for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of fly ash, in particular to a method for preparing aluminum chloride by using fly ash. Background technique [0002] Fly ash is a bulk solid waste produced during coal combustion and gasification. In recent years, the total output has reached about 600 million tons. However, due to the limitation of a single utilization method, nearly 200 million tons are still piled up every year, causing serious environmental pollution. and waste of resources. Low calorific value coal circulating fluidized bed combustion power generation is a combustion technology that has developed rapidly in recent years. It mainly uses low calorific value coal resources such as medium coal, coal gangue, and coal slime as fuel. The generated circulating fluidized bed fly ash is mainly composed of burnt clay amorphous phase material, which is difficult to use and is basically stockpiled at present. Circulat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/56
CPCC01F7/56C01P2006/80
Inventor 郭彦霞赵泽森崔莉成怀刚程芳琴
Owner SHANXI UNIV
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