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Method for extraction and preparation of alumina from coal ash

A technology of alumina and coal ash, which is applied to the removal of alumina/hydroxide and solid waste to achieve the effects of reducing pollution, realizing high value-added utilization, and reducing the amount of treatment

Active Publication Date: 2013-10-16
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of alumina from coal ash produced by catalytic coal gasification has not been reported so far.

Method used

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  • Method for extraction and preparation of alumina from coal ash
  • Method for extraction and preparation of alumina from coal ash
  • Method for extraction and preparation of alumina from coal ash

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Embodiment approach

[0032] For better illustrating the present invention, facilitate understanding technical scheme of the present invention, typical but non-restrictive embodiment of the present invention is as follows:

[0033] Such as figure 1 As shown, in a typical embodiment of the present invention, a method for extracting and preparing alumina from coal ash containing a catalyst, the method comprising:

[0034] (a) separation of catalysts and aluminum-containing compounds from coal ash;

[0035] (b) carbonizing the aluminum-containing compound to obtain a catalyst-containing solution and aluminum hydroxide;

[0036] (c) Calcining aluminum hydroxide to obtain alumina.

[0037] The catalyst refers to a catalyst that can produce a catalytic effect on the gasification reaction of coal. The present invention organically combines the catalyst recovery and the process of preparing alumina to improve the overall economics of the coal catalytic gasification process, which is in line with the poly...

specific Embodiment approach 1

[0055] Coal ash produced by catalytic coal gasification is used as raw material, and the catalyst used is potassium carbonate, potassium hydroxide, potassium sulfate, potassium chloride and other alkali metal potassium compounds, preferably potassium carbonate and potassium hydroxide.

[0056] Such as figure 1 As shown, the method for extracting and preparing alumina from coal ash comprises the following steps:

[0057] (1) Separation of catalysts and aluminum-containing compounds from coal ash;

[0058] (2) The above-mentioned aluminum-containing compound is subjected to carbonization at 30-70°C, and the pH value of the carbonization end point is 8-12. After filtration, aluminum hydroxide is obtained. The filtrate can be used as a coal catalytic gasification catalyst or in the leaching step The lye is recycled.

[0059] (3) Roasting: Roast the obtained aluminum hydroxide at a temperature of 1000-1300°C to obtain metallurgical grade alumina.

specific Embodiment approach 2

[0060] Coal ash produced by catalytic coal gasification is used as raw material, and the catalyst used is potassium carbonate, potassium hydroxide, potassium sulfate, potassium chloride and other alkali metal potassium compounds, preferably potassium carbonate and potassium hydroxide.

[0061] Such as figure 2 As shown, the method for extracting and preparing alumina from coal ash comprises the following steps:

[0062] (1) Water washing: use high-alumina coal ash containing catalyst potassium and deionized water (tap water, wastewater from the water washing tower in the process of coal catalytic gasification and gasification can also be used) (Water after process waste liquid treatment) is washed with water at a solid-to-liquid ratio of 1:1-6, the number of washings is 1-2 times, the washing temperature is 20-80°C, and the washing time is 10-60 minutes. Solution and washed solid ash;

[0063] (2) Digestion: Mix the washed ash and calcium hydroxide (calcined calcium oxide c...

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Abstract

The invention discloses a method for extraction and preparation of alumina from coal ash. The coal ash includes a catalyst. The method comprises the following steps: (a) separating the catalyst and an aluminum-containing compound from the coal ash; (b) subjecting the aluminum-containing compound to carbonation so as to obtain a solution containing the catalyst and aluminum hydroxide; and (c) roasting aluminum hydroxide so as to obtain alumina. According to the invention, recovery of the catalyst and extraction of aluminum are organically combined together, so economical efficiency of the integral process of the method is improved, and the method accords with the development idea of poly-generation in the coal chemical industry.

Description

technical field [0001] The invention relates to a method for extracting and preparing alumina from coal ash, belonging to the field of coal catalytic gasification. Background technique [0002] The coal ash produced during the coal catalytic gasification process is a complex alkali metal-containing silica-alumina formed by the alkali metal catalyst and the minerals in the coal under normal pressure or a certain pressure and at a relatively low temperature (600-800°C). salt. The coal ash of this catalytic gasification process is very different from the traditional coal ash raw material: First, various minerals in the coal undergo a solid-state reaction with some of the loaded alkali metal salts, and are fully sintered to form insoluble alkali metal salts ; Second, there will be no substances with good stability formed at high temperature such as glass and mullite in traditional coal ash in coal ash, and the activity is high; Third, calcium compounds are used for digestion in...

Claims

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Application Information

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IPC IPC(8): C01F7/02B09B3/00
Inventor 陈兆辉毕继诚李克忠郑岩
Owner ENN SCI & TECH DEV
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