Method for preparing aluminum-silicon powder from high-aluminum coal

Abstract

The invention discloses a method for preparing aluminum-silicon powder from high-aluminum coal. The method comprises the following steps: preparing the aluminum-silicon powder by using a reaction system for preparing the aluminum-silicon powder, wherein the reaction system comprises a coal water slurry supply system, a decarburization reaction system and an aluminum-silicon powder recovery system; the coal water slurry supply system is used for supplying coal water slurry to the decarburization reaction system; the decarburization reaction system comprises a decarburization reactor, an ignition burner, an ignition air duct, a cyclone separator and a return feeder; and the aluminum-silicon powder recovery system is connected to a top flue gas outlet of the cyclone separator through a flue gas duct and is used for further separating dust in flue gas from the cyclone separator to obtain an aluminum-silicon powder product. The prepared aluminum-silicon powder is low in carbon content, the content of gamma-Al2O3 in the aluminum-silicon powder is high, subsequent extraction of aluminum oxide is facilitated, and resource utilization of the aluminum-silicon powder in the high-aluminum coal is achieved.

Description

technical field [0001] The invention relates to the field of coal resource utilization, in particular to a method for preparing aluminum-silicon powder from high-alumina coal. Background technique [0002] There is a large amount of high-aluminum coal in the Inner Mongolia Autonomous Region of my country, and the Al in the ash of this coal 2 o 3 The content is as high as 55%. At present, this type of coal is mainly used in the combustion of power fuel in traditional thermal power plants. However, due to factors such as high combustion temperature and wide range of combustion temperature in thermal power plants, the ash content (mainly aluminum silicon powder) after combustion is oxidized. The uniformity of the aluminum crystal structure is poor, and most of the alumina is α-Al 2 o 3 , while α-Al 2 o 3 It is difficult to extract from ash and slag in the subsequent solid waste utilization, and the carbon content in ash is also high, which has a great impact on the compreh...

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Problems solved by technology

[0002] There is a large amount of high-aluminum coal in the Inner Mongolia Autonomous Region of my country, and Al in the ash content of this coal 2 o 3 The content is as high as 55%. At present, this type of coal is mainly used in the combustion of power fuel in traditional thermal power plants. However, due to factors such as high combustion temperature and wide range of combustion temperature in thermal power plants, the ash content (mainly aluminum silicon powder) after combustion is oxidized. The uniformity of the aluminum crystal structure is poor, and most of the alumina is α-Al 2 o 3 , while α-Al 2 o 3 It is difficult to extract from the ash in the subsequent solid waste utilization, and the carbon content in the ash is also high, which has a great impact on the comprehensive utilization of ash

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