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Dissolution method of aluminum from fly ash

A fly ash, acid-soluble technology, applied in the direction of improving process efficiency, can solve the problems of complex process and high energy consumption, and achieve the effect of simplifying the process flow, saving energy and reducing costs

Active Publication Date: 2014-05-28
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to provide a method for dissolving aluminum from fly ash to solve the problems of complicated process and high energy consumption in the prior art when dissolving fly ash in a fluidized bed

Method used

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  • Dissolution method of aluminum from fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take 1000kg circulating fluidized bed fly ash and use TNG-7518 dry magnetic separator to pretreat the fly ash to remove Fe 2 o 3 , where the magnetic induction intensity on the surface of the cylinder is 300mT, and the Fe in the fly ash after magnetic separation 2 o 3 The content is less than 1%.

[0036] Put the pretreated fly ash into an acid-resistant reaction kettle, add 30wt% hydrogen chloride ethanol solution to the fly ash for acid-dissolution reaction, and obtain an acid-dissolved product. The molar ratio of HCl in the added hydrogen chloride ethanol solution to the alumina in the fly ash is 5:1, the acid dissolution reaction temperature is 100°C, the pressure is 1.5MPa, and the time is 1.5 hours.

[0037] A plate and frame filter press is used to filter the acid-dissolved product under pressure, and separate solid and liquid to obtain an alcoholic solution whose main component is aluminum chloride. The pressure of pressure filtration is 0.5Mpa and the temper...

Embodiment 2

[0039] Take 1000kg circulating fluidized bed fly ash and use TNG-7518 dry magnetic separator to pretreat the fly ash to remove Fe 2 o 3 , where the magnetic induction intensity on the surface of the cylinder is 300mT, and the Fe in the fly ash after magnetic separation 2 o 3 The content is less than 1%.

[0040] The pretreated fly ash is put into an acid-resistant reaction kettle, and a hydrogen chloride ethanol solution with a concentration of 20wt% is added to the fly ash for acid-dissolving reaction to obtain an acid-dissolved product. Among them, the molar ratio of HCl in hydrogen chloride ethanol solution to alumina in fly ash is 6:1, the reaction temperature is 160°C, the reaction pressure is 0.3MPa, and the acid dissolution reaction time is 2.5 hours.

[0041] A plate and frame filter press is used to filter the acid-dissolved product under pressure, and separate solid and liquid to obtain an alcoholic solution whose main component is aluminum chloride. The pressure...

Embodiment 3

[0043] Take 1000kg circulating fluidized bed fly ash and use TNG-7518 dry magnetic separator to pretreat the fly ash to remove Fe 2 o 3 , where the magnetic induction intensity on the surface of the cylinder is 300mT, and the Fe in the fly ash after magnetic separation 2 o 3 The content is less than 1%.

[0044] The pretreated fly ash is put into an acid-resistant reaction kettle, and a hydrogen chloride ethanol solution with a concentration of 25wt% is added to the fly ash for acid-dissolving reaction to obtain an acid-dissolved product. Among them, the molar ratio of HCl in hydrogen chloride ethanol solution to alumina in fly ash is 7:1, the reaction temperature is 180°C, the acid dissolution reaction pressure is 2.5MPa, and the acid dissolution reaction time is 1.5 hours.

[0045] A plate and frame filter press is used to filter the acid-dissolved product under pressure, and separate solid and liquid to obtain an alcoholic solution whose main component is aluminum chlori...

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Abstract

The invention discloses a dissolution method of aluminum from fly ash. The method comprises the following steps of: S1, pretreating the fly ash; S2, adding a hydrochloric acid alcohol solution into the pretreated fly ash to carry out an acid dissolution treatment so as to obtain acid soluble products; S3, carrying out solid-liquid separation on the acid soluble products to obtain an alcohol solution of aluminum chloride; S4, evaporating the alcohol solution of aluminum chloride and carrying out solid electrolysis on obtained anhydrous aluminum chloride to obtain primary aluminum. The acid dissolution treatment and the solid-liquid separation are carried out on fluidized bed fly ash with higher reactivity by using the hydrochloric acid alcohol solution, then the alcohol solution of aluminum chloride can be obtained, the alcohol solution of aluminum chloride is evaporated to obtain the anhydrous aluminum chloride, and the anhydrous aluminum chloride is electrolyzed to obtain the primary aluminum. According to dissolution method disclosed by the invention, steps of hydrochloric acid aqueous solution evaporative crystallization and high temperature sintering are eliminated and technological process is simplified. The energy consumed for evaporating the alcohol solution is further lower than that consumed for evaporating a hydrochloric acid aqueous solution, so that the energy is saved and the cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of fly ash utilization, in particular to a method for dissolving aluminum from fly ash. 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 current comprehensive utilization of fly ash is mainly for 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 furnace is produce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B21/00C22B3/44
CPCY02P10/20
Inventor 王启瑞孙国才王连蒙郭昭华苗家兵周永利赵宇航
Owner CHINA SHENHUA ENERGY CO LTD
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