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

A technology of fly ash and aluminum chloride, applied in the direction of aluminum chloride, aluminum halide, recycling technology, etc., can solve the problems of adverse effects on physical and chemical properties of crystalline aluminum chloride products, high iron content, etc., and achieve iron removal Good effect, high raw material utilization rate and low production cost

Inactive Publication Date: 2010-09-22
CHINA SHENHUA ENERGY CO LTD +1
View PDF4 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing low-ferrum crystalline aluminium chloride from coal ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Get the fluidized bed fly ash and pulverize to 120 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 17,500 GS for 3 times, obtain a filter cake with a solid content of 37.5wt% after press filtration with a plate basket filter press (Henan Yuzhou filter press factory, model: BAS320);

[0040] (2) Put the filter cake into an acid-resistant reaction kettle, add industrial hydrochloric acid with a concentration of 28wt% to carry out acid-dissolution reaction, the mol ratio of HCl in hydrochloric acid and aluminum oxide in fly ash is 5: 1, and the stripping temperature is 150° C., stripping pressure 1.0MPa, stripping 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;

[0041](3) A...

Embodiment 2

[0046] (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 10,000 GS for 4 times, after pressing with a BAS320 plate basket filter press, a filter cake with a solid content of 35wt% was obtained;

[0047] Step (2) is with embodiment 1;

[0048] (3) After cooling the pickling solution to 90°C by heat exchange, use a corrosion-resistant pump to press into a resin column equipped with JK008 macroporous cationic resin (manufacturer: Anhui Wandong Chemical Factory) to remove iron. The immersion liquid flow rate is 2 times of resin volume / hour, obtains aluminum chloride refining liquid;

[0049] When the macroporous cationic resin is adsorbed and saturated, the resin can recover its adsorption capacity through elution and regeneration. The elution conditions ...

Embodiment 3

[0053] (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 20,000 GS for 3 times, and a filter cake with a solid content of 40wt% was obtained after pressing with a BAS320 plate basket filter press;

[0054] Step (2) is with embodiment 1;

[0055] (3) After cooling the pickling solution to 70°C by heat exchange, use a corrosion-resistant pump to press into a resin column equipped with SPC-1 macroporous cationic resin (manufacturer: Shanghai Resin Factory) to remove iron. The immersion liquid flow rate is 3 times of resin volume / hour, obtains aluminum chloride refining liquid;

[0056] When the macroporous cationic resin is adsorbed and saturated, the resin is eluted and regenerated to restore its adsorption capacity. The elution conditions are: water is used as the eluent,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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 magnetic separation and hydrochloric acid to obtain pickle liquor; 3, introducing the pickle liquor into a resin column to perform deep ferrum removal to obtain refined crystalline aluminium chloride solution; and 4, concentrating and crystallizing the refined crystalline aluminium chloride solution, performing solid-liquid separation and drying to obtain crystalline aluminium chloride products. The method has the advantages of wide raw material source, high utilization rate of raw materials, simple operation step and low cost. The crystalline aluminium chloride product prepared by the method of the invention is pure white crystal, and has the A1C13.6H2O content of more than or equal to 96 weight percent and ferrum (Fe) content of below 2*10-5 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01F7/56
CPCY02W30/82
Inventor魏存弟郭昭华张培萍池君洲李楠赵以辛
OwnerCHINA SHENHUA ENERGY CO LTD