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Method for preparing anhydrous aluminum chloride by microwave chlorination of fly ash

An anhydrous aluminum chloride, fly ash technology, applied in aluminum chloride, chemical instruments and methods, aluminum halide and other directions, can solve the problems of high production cost, high energy consumption, complicated operation, etc. The effect of high thermal efficiency and cheap and easy-to-obtain raw materials

Inactive Publication Date: 2016-10-12
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method uses fly ash as a raw material to directly produce anhydrous aluminum chloride, and the added value of the product is improved, and the method overcomes the disadvantages of complicated operation, high energy consumption and high production cost in the prior art

Method used

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  • Method for preparing anhydrous aluminum chloride by microwave chlorination of fly ash

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Embodiment 1

[0033]A method for preparing anhydrous aluminum chloride by microwave chlorination of fly ash, comprising the following steps:

[0034] Step 1, high aluminum fly ash microwave heating chlorination decomposition:

[0035] Add activated carbon to the high-alumina fly ash containing 25% alumina, mix evenly, pass in chlorine gas, the pressure is normal pressure, use a microwave fluidized bed with a microwave frequency of 2.5 GHz to heat for 10 minutes, reach 800 ° C, keep the temperature for 20 minutes, Fully decompose the high-alumina fly ash to obtain a variety of chlorinated mixed gases containing aluminum chloride; wherein, according to the mass ratio, high-alumina fly ash: activated carbon = 1: 2, high-alumina fly ash: chlorine = 1: 4;

[0036] Step 2, separation and purification:

[0037] A variety of chlorinated mixed gases containing aluminum chloride remove impurities through a three-stage condensation recovery device to obtain anhydrous aluminum chloride products with ...

Embodiment 2

[0040] A method for preparing anhydrous aluminum chloride by microwave chlorination of fly ash, comprising the following steps:

[0041] Step 1, high aluminum fly ash microwave heating chlorination decomposition:

[0042] Add petroleum coke to the high-alumina fly ash containing 30% alumina, mix evenly, pass in chlorine gas, the pressure is normal pressure, use a microwave fluidized bed with a microwave frequency of 2.5GHz to heat for 5 minutes, reach 700°C, and keep the temperature constant for 30 minutes , the high-alumina fly ash is fully decomposed to obtain a variety of chlorinated mixed gases containing aluminum chloride; wherein, by mass ratio, high-alumina fly ash: petroleum coke = 1: 1.5, high-alumina fly ash: chlorine gas = 1:3;

[0043] Step 2, separation and purification:

[0044] A variety of chlorinated mixed gases containing aluminum chloride remove impurities through a three-stage condensation recovery device to obtain anhydrous aluminum chloride products wit...

Embodiment 3

[0047] A method for preparing anhydrous aluminum chloride by microwave chlorination of fly ash, comprising the following steps:

[0048] Step 1, high aluminum fly ash microwave heating chlorination decomposition:

[0049] Add charcoal to the high-alumina fly ash containing 25% alumina, mix evenly, pass in chlorine gas, the pressure is normal pressure, use a microwave fluidized bed with a microwave frequency of 2.3GHz to heat for 30min, reach 900°C, and keep the temperature constant for 10min , the high-alumina fly ash is fully decomposed to obtain a variety of chlorinated mixed gases containing aluminum chloride; wherein, by mass ratio, high-alumina fly ash: charcoal = 1: 3, high-alumina fly ash: chlorine = 1:5;

[0050] Step 2, separation and purification:

[0051] A variety of chlorinated mixed gases containing aluminum chloride remove impurities through a three-stage condensation recovery device to obtain anhydrous aluminum chloride products with a purity greater than 99%...

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Abstract

The invention relates to a method for preparing anhydrous aluminum chloride by microwave chlorination of fly ash and belongs to the technical field of aluminum chloride production. The method comprises a step 1 of causing high-alumina fly ash to undergo microwave heating chlorination decomposition: adding the high-alumina fly ash into solid carbon, performing mixing evenly, leading chlorine into the mixture, adopting a microwave fluidized bed with a microwave frequency of 2.3-2.5 GHz to perform heating for 5-60 min to reach 300-1200 DEG C, maintaining the constant temperature for 10-60 min, fully decomposing the high-alumina fly ash, and obtaining various chlorinated mixed gases containing aluminum chloride; a step 2 of performing separation and purification: causing the various chlorinated mixed gases containing aluminum chloride to undergo impurity removal and refining through a three-level condensation recycling device, and obtaining the anhydrous aluminum chloride product with a purity of larger than 99%. According to the method, the fly ash is adopted as a raw material to directly produce anhydrous aluminum chloride, the additional value of the product is improved, and the shortcomings of complexity in operation, high energy consumption and high production cost in the prior art are overcome through the method.

Description

technical field [0001] The invention belongs to the technical field of aluminum chloride production, in particular to a method for preparing anhydrous aluminum chloride by microwave chlorination of fly ash. Background technique [0002] Fly ash is a solid waste after coal combustion. The annual discharge of fly ash from coal-fired thermal power plants is nearly 400 million tons, and there are many oxides (Al 2 o 3 , SiO 2 , Fe 2 o 3 , K 2 O, Na 2 O, TiO 2 , CaO, MgO), in which the alumina content is equivalent to that in my country's medium and low-grade bauxite, and high-alumina fly ash is a potential resource that can replace bauxite in my country's alumina industry. Fly ash is the main source of suspended particulate matter, causing regional air pollution and endangering human health. Long-term stockpiling of fly ash will also pollute soil and water bodies, threatening human health and wasting a lot of water resources. The comprehensive utilization of bulk solids...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/60B01J19/12C01B33/107
CPCC01F7/60B01J19/126B01J2208/00442B01J2219/00141C01B33/10721C01P2006/80
Inventor 吕国志张廷安刘燕豆志河王龙王艳秀李小龙赵秋月
Owner NORTHEASTERN UNIV
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