Method for preparing low-ferrum crystalline aluminium chloride from coal ash

A technology for crystallizing aluminum chloride and fly ash, applied in the directions of aluminum chloride, aluminum halide, etc., can solve the problems of adverse effects on the physical and chemical properties of crystallized aluminum chloride products, high iron content, and achieve good iron removal effect. The effect of high utilization rate of raw materials and small amount of residues

Inactive Publication Date: 2010-09-22
CHINA SHENHUA ENERGY CO LTD +1
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  • Application Information

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Problems solved by technology

Because iron in fly ash is easily dissolved in acid, and in this method, there is no necessary measure for removing iron, so it will cause high iron content in the product crystalline aluminum chloride, and the presence of iron will affect the crystallized chlorine. Adversely affect the physical and chemical properties of aluminum products
[0005] At present, there is no method for directly producing low-iron crystalline aluminum chloride with fly ash, therefore, it is necessary to design a method for preparing low-iron crystalline aluminum chloride with fly ash as raw material, so as to overcome the above-mentioned defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Get the fluidized bed fly ash and pulverize to 200 orders, add water to make a slurry with a solid content of 33wt%, use the vertical ring magnetic separator for fly ash iron removal disclosed in the Chinese invention application 201010112520.3 Magnetic separation under 12,000 GS for 3 times, the iron oxide content in the fly ash is reduced to 0.8wt%, and the solid content is 37.5 wt% filter cake;

[0038] (2) filter cake is put into acid-resistant reactor, and adding concentration is that the industrial hydrochloric acid of 28wt% carries out acid dissolution reaction, and the mol ratio of aluminum oxide in the HCl in the hydrochloric acid and the fly ash is 4.5: 1, and stripping temperature 150 ℃, stripping Pressure 1.0MPa, dissolution time 2h, after the reaction product is press-filtered and washed by the above-mentioned plate basket filter press, an acid dipping solution with a pH value of 1.5 is obtained;

[0039] (3) Concentrate the pickling liquid under reduc...

Embodiment 2

[0043] Except step (1), other operating process conditions are all identical with embodiment 1. The operating process condition adjustment in the step (1) is:

[0044] (1) Get the fluidized bed fly ash and pulverize to 300 orders, add water and make the slurry that the solid content is 35wt%, use the vertical ring magnetic separator disclosed in No. 201010112520.3 for fly ash iron removal in China Magnetic separation under 17,500 GS for 4 times, the iron oxide content in the fly ash is reduced to 0.5wt%, and it is 38wt to obtain the solid content after pressing with a plate basket filter press (Henan Yuzhou filter press factory, model: BAS320) % of filter cake;

[0045] After determination, the content of iron (Fe) in the crystalline aluminum chloride product is 0.020wt%.

Embodiment 3

[0047] Except step (1), other operating process conditions are all identical with embodiment 1. The operating process condition adjustment in the step (1) is:

[0048] (1) Get the fluidized bed fly ash and pulverize to 200 orders, add water to make a slurry with a solid content of 30wt%, use the vertical ring magnetic separator disclosed in the Chinese invention application No. 201010112520.3 for fly ash iron removal Magnetic separation under 20,000 GS for 2 times, the iron oxide content in the fly ash is reduced to 0.7wt%, and it is 35wt to obtain the solid content after pressing with a plate basket filter press (Henan Yuzhou filter press factory, model: BAS320) % of filter cake;

[0049] After determination, the content of iron (Fe) in the crystalline aluminum chloride product is 0.022wt%.

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Abstract

The invention provides a method for preparing low-ferrum crystalline aluminium chloride from coal ash, which comprises the following steps of: 1, crushing the coal ash, and performing wet magnetic separation on the crushed coal ash to remove ferrum; 2, reacting the coal ash subjected to ferrum removal and hydrochloric acid to obtain pickle liquor; 3, concentrating the pickle liquor under a reduced pressure, cooling and crystallizing to obtain crystalline aluminium chloride slurry; and 4, performing solid-liquid separation on the crystalline aluminium chloride slurry, rinsing with leacheate, performing solid-liquid separation and drying to obtain low-ferrum crystalline aluminium chloride products. The method has the advantages of wide raw material source, low cost, simple operation step, easily controlled production process, stable product quality and the like. The ferrum (Fe) content of the crystalline aluminium chloride products prepared by the method of the invention is no more than 0.025 weight percent.

Description

technical field [0001] The invention relates to a method for preparing crystalline aluminum chloride, in particular to a method for preparing low-iron crystalline aluminum chloride by using fly ash as a raw material. Background technique [0002] Fly ash is a waste discharged from coal-fired power plants. my country is a country where coal is the main energy source. The fly ash discharged from power plants is as high as hundreds of millions of tons every year. The discharge of fly ash not only occupies a large amount of land, but also seriously pollutes the environment. How to deal with and utilize fly ash has become a very important issue. On the other hand, fly ash contains a variety of components that can be used. Studies have shown that circulating fluidized bed fly ash usually contains 30-50% aluminum (calculated as alumina). In today's increasingly scarce resources, Extracting aluminum from fly ash to prepare crystalline aluminum chloride is an effective way to turn fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/62
Inventor 池君洲郭昭华杨殿范徐少南孙延彬李文清
Owner CHINA SHENHUA ENERGY CO LTD
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