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Method for waste heat recovery and utilization of roasted alumina

A waste heat recovery, alumina technology, applied in alumina/hydroxide preparation, chemical industry, sustainable manufacturing/processing, etc., can solve the problems of heat pollution, heat can not be recycled, etc., to reduce operating costs, reduce heat Pollution, the effect of improving efficiency

Inactive Publication Date: 2013-01-02
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] In order to solve the above-mentioned technical problems, the present invention provides a method for recovering and utilizing the waste heat of calcined alumina.

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  • Method for waste heat recovery and utilization of roasted alumina

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited by the embodiments.

[0023] As shown in the figure, the method for recovering and utilizing the waste heat of roasted alumina of the present invention includes the following steps: completely cancel the original roasting independent circulating water system, and the high-temperature alumina 2 cooled by the multi-stage cyclone cooling system of the roaster in the double-chamber fluid state The inside of the chemical cooler 1 is fluidized and cooled by air 4, and at the same time, it is cooled by a cooling medium. When the cooling medium is unqualified condensed water 6 from the alumina production system (such as evaporation and other processes with self-evaporation and indirect heat exchange devices), its Heated in the double-chamber fluidized cooler 1, the hot water obtained goes to wash the aluminum hydrox...

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Abstract

The invention relates to a method for the waste heat recovery and utilization of roasted alumina. The method includes subjecting the high-temperature alumina subjected to the primary cooling by a roasting furnace multistage cyclone cooling system to air fluidized cooling in a double-chamber fluidized cooler, and cooling with a cooling medium. When the cooling medium is the unqualified condensed water from an alumina production system, it is heated in the double-chamber fluidized cooler, and the obtained hot water is used to wash aluminum hydroxide, or wash fine seeds; when the cooling medium is evaporative water cooler drainage water or red mud storage space return water, it is heated in the double-chamber fluidized cooler, and the obtained hot water is used to wash red mud; and the unqualified condensed water, the evaporative water cooler drainage water and the red mud storage space return water are not used as the cooling medium of the double-chamber fluidized cooler simultaneously. The invention improves the waste heat recovery efficiency of the roasting furnace system, reduces the energy consumption of the whole system, reduces the thermal pollution of the roasting system, reduces the construction investment, and reduces the running cost of the system.

Description

technical field [0001] The invention relates to a method for recovering and utilizing waste heat, in particular to a method for recovering and utilizing waste heat of roasted alumina in alumina production. Background technique [0002] The roasting systems mainly used in my country include the gas suspension roaster (G.S.C) of Danbiao Smith Company, the circulating fluidized bed roaster (C.F.C) of Lurgi Company of Germany, and the fluidized boiling flash furnace (F.F.C) of Alcoa. At present, the gas suspension roaster is the most widely used in my country's alumina industry. [0003] The wet aluminum hydroxide from the filtration process is dried and preheated in the roasting furnace, and then roasted in the PO4 roasting furnace, where dehydration and crystal transformation reactions occur. The temperature of the produced alumina is about 190-250 after passing through a four-stage cyclone cooler. ℃ into the second-stage double-chamber fluidized cooler, using circulating wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30
CPCY02P20/10Y02P20/129
Inventor 李志国周凤禄郑飞
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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