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Method for extracting aluminum oxide by coupling catalytic gasification and gasified ash

A technology of catalytic gasification and alumina, which is applied in chemical instruments and methods, gasification process, aluminum compounds, etc., can solve the problems of high cost, high roasting temperature, and high energy consumption, and achieve the promotion of recycling, good benefits, and high energy consumption. The effect of low consumption

Inactive Publication Date: 2019-01-01
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the traditional extraction of alumina from combustion ash, this process has obvious advantages, but this process still needs to add alkaline earth metal Ca to the catalyst recovery residue, and it needs high-temperature roasting to realize Al recovery, which has the disadvantages of high roasting temperature, high energy consumption, and cost high disadvantage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: This embodiment takes Sunjiahao high-alumina coal as raw material, with Na 2 CO 3 with Ca(OH) 2 As a catalyst, catalytic gasification at high temperature to obtain catalytic gasification ash, the catalytic gasification ash is obtained by water leaching to obtain aluminum-containing crude liquid, and then by adding Ca(OH) 2 Desiliconization, carbonization, and filtration to obtain aluminum hydroxide products, the residue after aluminum leaching and the desiliconization residue are leached into the solution through high-temperature hydrothermal reaction Na, and Na 2 CO 3 The catalyst is recovered.

[0035] Specific steps are as follows:

[0036] (1) Catalyst loading and formation of catalytic gasification ash: Na 2 CO 3 The mass ratio to coal ash is 0.8, and the Ca / Si mass ratio is 1.6. 2 CO 3 , Ca(OH) 2 The catalyst is loaded, and the high-alumina pulverized coal loaded with the catalyst is obtained after mixing in a ball mill. Catalytic gasificat...

Embodiment 2

[0041] Example 2: In this example, Sunjiahao high-alumina coal is used as raw material (the composition is the same as in Example 1), and NaOH and CaO are used as catalysts to catalytic gasify at high temperature to obtain catalytic gasification ash. The catalytic gasification ash passes through 5 wt% NaOH solution is leached to obtain aluminum-containing crude liquid, and then by adding Ca(OH) 2 Desiliconization, carbonization, and filtration to obtain aluminum hydroxide products. The residue after aluminum leaching and desiliconization residue are leached into the solution through high-temperature hydrothermal reaction Na to realize Na 2 CO 3 Catalyst recovery.

[0042] Specific steps are as follows:

[0043] (1) Catalyst loading and generation of catalytic gasification ash: The mass ratio of NaOH to coal ash is 1.2, and the mass ratio of Ca / Si is 2.2. Sunjiahao high-alumina coal, NaOH, and CaO are loaded on the catalyst, and the loaded catalyst is obtained after mixing in...

Embodiment 3

[0048] Example 3: In this example, Sunjiahao high-alumina coal is used as the raw material (the composition is the same as in Example 1), and NaOH and CaCO 3 As a catalyst, it is catalytically gasified at high temperature to obtain catalytic gasification ash, which is passed through 1 wt% Na 2 CO 3 The solution is leached to obtain the aluminum-containing crude liquid, and then by adding Ca(OH) 2 Desiliconization, carbonization, and filtration to obtain aluminum hydroxide products. The residue after aluminum leaching and desiliconization residue are leached into the solution through high-temperature hydrothermal reaction Na to realize Na 2 CO 3 Catalyst recovery.

[0049] Specific steps are as follows:

[0050] (1) Catalyst loading and formation of catalytic gasification ash: with the mass ratio of NaOH to coal ash as 0.8 and the mass ratio of Ca / Si as 1.1, Sunjiahao high alumina coal, NaOH, CaCO 3 The catalyst is loaded, and the high-alumina pulverized coal loaded with t...

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Abstract

The invention discloses a method for extracting aluminum oxide by coupling catalytic gasification and gasified ash and the method comprises the steps that high-aluminum coal, a Na-contained catalyst or a K-contained catalyst, and a Ca-contained catalyst are mixed, and thus catalyst-loaded high-aluminum powdered coal is obtained; the catalyst-loaded high-aluminum powdered coal is catalytically gasified at high temperature, and thus catalytically-gasified ash is obtained; direct extracting is carried out to obtain aluminum-contained crude liquid and Al leaching residues; the aluminum-contained crude liquid is desiliconized to obtain a desiliconized aluminum-contained solution and desiliconization residues; the desiliconized aluminum-contained solution is subjected to carbonation decomposition and then is filtered and washed, and thus an aluminum hydroxide and alkali metal carbonate solution is prepared; and the Al leaching residues and the desiliconization residues perform a high-temperature hydrothermal reaction for metal dealkalization, and the catalysts are recycled. The method has the advantages of low energy consumption and cost.

Description

technical field [0001] The invention belongs to the comprehensive utilization of coal ash, in particular to a method for extracting alumina by catalytic gasification coupled with gasification ash. Background technique [0002] The main aluminum-containing mineral in high-alumina coal is kaolinite (Al 2 o 3 2SiO2 2 2H 2 O) and boehmite (AlOOH), as potential alumina providers and bauxite substitutes, the extraction of alumina from coal ash can realize the resource utilization of coal ash, while greatly reducing the potential harm of coal ash to the environment Therefore, it is of great significance to extract alumina from coal ash, and it is becoming the research focus of many scientific research institutions and enterprises. [0003] At present, there are many processes for extracting alumina from coal ash, which are mainly divided into acid method, alkali method and roasting activation method. However, it mainly uses the combustion ash of coal-fired power plants as the ...

Claims

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Application Information

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IPC IPC(8): C10J3/72C01F7/44C01F7/20C01F7/14
CPCC01F7/142C01F7/20C01F7/441C10J3/72C10J2300/093C10J2300/0986C10J2300/1625
Inventor 王志青梅艳钢黄戒介房倚天张永奇宋双双李莉李翔宇聂伟余中亮刘哲语
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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