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Method for preparing aluminum oxide from coal series kaolinite rock or coal gangue

A technology of kaolinite and coal gangue, which is applied in the field of high-value comprehensive utilization of coal-measure kaolinite or coal gangue resources, can solve the problems of high leaching temperature, high calcination temperature, and long leaching time, and achieve energy saving and resources, mild operating conditions, and reduced energy consumption

Inactive Publication Date: 2008-08-06
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

[0006] As far as the current process of preparing alumina from coal series kaolinite or coal gangue is concerned, in order to improve the reaction activity and increase the extraction rate, there are generally problems of high calcination temperature or long calcination time, high leaching temperature and long leaching time. High energy consumption and complex process conditions increase the economic cost and the difficulty of industrial control

Method used

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  • Method for preparing aluminum oxide from coal series kaolinite rock or coal gangue

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Experimental program
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Effect test

Embodiment 1

[0023] The coal gangue with a mass percentage of carbon of 20% and a mass percentage of alumina of 33.18% was crushed and ground to a size less than 120 μm, calcined at 550°C for 60 minutes, and 25% of Hydrochloric acid, leached at 100°C for 60 minutes, the leaching rate of alumina was 87.45%, and the aluminum chloride solution was obtained by filtration and separation. Aluminum chloride is directly decomposed at 250°C to produce fine powder alumina, which is preheated and then modified at 1200°C to obtain sandy alumina.

Embodiment 2

[0025] The coal gangue with a mass percentage of carbon of 20% and a mass percentage of alumina of 33.18% is crushed and ground until all of them are smaller than 75 μm. Calcined at 700°C for 10 minutes, added hydrochloric acid with a concentration of 15% according to the solid-to-liquid mass ratio of 1:10, leached at 60°C for 30 minutes, the leaching rate of alumina was 92.71%, and the aluminum chloride solution was obtained by filtration and separation. 0.1MPa, under the condition of 0°C, the precipitant is passed through for 60 minutes, and the hydrous aluminum chloride obtained by crystallization and separation is directly decomposed at 150°C to obtain fine powder alumina, which is preheated and subjected to 1000 ℃ modified to get sandy alumina.

Embodiment 3

[0027] Crush and grind coal gangue with a mass percentage of carbon of 20% and a mass percentage of alumina of 33.18% until it is less than 75 μm in size, and calcined at 600°C for 30 minutes, and the leaching rate of alumina is 91.30%. : 8 Add the hydrochloric acid of concentration 20%, leaching at 95 ℃ for 30 minutes, filter and separate to obtain the aluminum chloride solution, the filtrate is passed through the precipitant at 0.1MPa, 0 ℃ and kept for 60 minutes, and the obtained water-containing Aluminum chloride is directly decomposed at 250°C to produce fine powder alumina, which is preheated and then modified at 1200°C to obtain sandy alumina.

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Abstract

The invention relates to a method for preparing alumina by using kaolinite in coal measures or coal gangue as raw material with simple process and low energy consumption; by utilizing special influence of inner heat source (carbon) in the kaolinite in coal measures or coal gangue on calcination performance of the kaolinite in coal measures, the alumina is prepared after crashing, low temperature calcination, hydrochloric acid leaching, filtration, purification and fractional-step pyrolysis by fractional steps. The method for preparing the alumina has the advantages that the problems that calcination temperature of the prior art is high or calcination time is long as well as leaching temperature is high or leaching time is long are solved; process energy consumption is reduced; intermediate product of the purified and separated watery alumina is not required to be dried; the alumina is prepared directly by using the method of the pyrolysis by fractional steps; the process is simplified and operability is improved.

Description

【Technical field】 [0001] The invention relates to the field of high-value comprehensive utilization of coal-measure kaolinite or coal gangue as resources, in particular to a method for preparing alumina from coal-measure kaolinite or coal gangue with a simple process and low energy consumption. 【Background technique】 [0002] The coal gangue discharged from the coal mining industry has been listed as one of the top ten major industrial solid wastes in the world today. According to the "2007-2008 China Coal Gangue Industry Analysis and Investment Consulting Report", the large-scale utilization of coal gangue in my country is currently mainly concentrated in power generation, building materials, underground filling, land reclamation, road construction, etc. Disposal of coal gangue accounted for about 50% of the coal gangue discharge in that year. By 2005, the cumulative storage of coal gangue was 3 billion tons, accounting for more than 40% of China's total industrial solid was...

Claims

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Application Information

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IPC IPC(8): C01F7/22
Inventor 乔秀臣司鹏于建国罗妍周华梅陈艳宋兴福
Owner EAST CHINA UNIV OF SCI & TECH
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