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Method for dissolving aluminum out of circulating fluidized bed coal ash

A circulating fluidized bed and fly ash technology, applied in aluminum chloride, aluminum halide, aluminum sulfate and other directions, can solve the problems of low activity and low alumina extraction rate, and achieve pollution reduction, energy saving, and improvement of utilization rate. Effect

Active Publication Date: 2011-08-17
CHINA SHENHUA ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

But as mentioned before, pulverized coal furnace fly ash is mainly composed of glass phase, which has low activity with acid reaction, resulting in low extraction rate of alumina

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take circulating fluidized bed fly ash, its chemical composition is shown in Table 1 (after drying at 110°C). Crush the fly ash of the circulating fluidized bed to 120 mesh, put it into an acid-resistant reaction kettle, add industrial hydrochloric acid with a concentration of 28wt% to carry out the acid dissolution reaction, and the molar ratio of HCl in the hydrochloric acid to alumina in the fly ash is 5:1 , the reaction temperature is 200° C., the reaction pressure is 2.1 MPa, and the reaction time is 2 hours. After the reaction product is filtered and washed by a basket filter press, an acid dipping solution whose main component is aluminum chloride is obtained. It was determined that the dissolution rate of alumina in fly ash was 88.3%.

Embodiment 2

[0019] The chemical composition of the fluidized bed ash is shown in Table 1 (after drying at 110°C). Crush the fly ash of the circulating fluidized bed to 120 mesh, put it into an acid-resistant reaction kettle, add industrial hydrochloric acid with a concentration of 20wt% to carry out acid dissolution reaction, the molar ratio of HCl in the hydrochloric acid to alumina in the fly ash is 9:1, The reaction temperature is 100° C., the reaction pressure is 0.1 MPa, and the reaction time is 1 hour. After the reaction product is filtered and washed by a basket filter press, an acid dipping solution whose main component is aluminum chloride is obtained. It was determined that the dissolution rate of alumina in fly ash was 80.1%.

Embodiment 3

[0021] The chemical composition of the fluidized bed ash is shown in Table 1 (after drying at 110°C). Crush the fly ash of the circulating fluidized bed to 150 mesh, put it into an acid-resistant reaction kettle, add industrial hydrochloric acid with a concentration of 22wt% to carry out acid dissolution reaction, the molar ratio of HCl in the hydrochloric acid and alumina in the fly ash is 5:1, The reaction temperature is 160° C., the reaction pressure is 1.3 MPa, and the reaction time is 2 hours. After the reaction product is filtered and washed by a basket filter press, an acid dipping solution whose main component is aluminum chloride is obtained. It was determined that the dissolution rate of alumina in fly ash was 82.2%.

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Abstract

The invention relates to a method for dissolving aluminum out of circulating fluidized bed coal ash. The method includes the steps of mixing the circulating fluidized bed coal ash with acid according to a certain ratio for acid dissolution reaction, and conducting solid-liquid separation and washing on a product produced after acid dissolution reaction to obtain acid leaching liquor, namely the aluminum is thus dissolved out of from the coal ash. In the method, the circulating fluidized bed coal ash is taken as a raw material and the acid dissolution method is utilized for dissolving out the aluminum; the dissolution rate of the aluminum is above 80%; and the method is simple in technology, saves energy, reduces waste, greatly improves the utilization rate of the coal ash and lowers pollution.

Description

technical field [0001] The invention belongs to the field of fly ash utilization and relates to a method for dissolving aluminum from fly ash in a circulating fluidized bed. Background technique [0002] Fly ash is one of the largest industrial wastes in my country. With the development of coal-based heavy industries such as the electric power industry, the discharge of coal-fired fly ash is increasing year by year. The pollution of fly ash to the environment is multifaceted and cannot be ignored. Therefore, the treatment and utilization of fly ash has attracted widespread attention. Fly ash mainly contains alumina and silica, so the comprehensive utilization of fly ash mainly focuses on the extraction of alumina and silica contained in it. [0003] At present, the research on the comprehensive utilization of fly ash is mainly aimed at the fly ash of pulverized coal furnace. Pulverized coal furnace is a traditional combustion technology. The fly ash of pulverized coal furn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/56C01F7/74B09B3/00
Inventor 蒋引珊魏存弟郭昭华李楠孙延彬徐少南田慎重
Owner CHINA SHENHUA ENERGY CO LTD
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