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A device and method for preparing alumina by roasting hexahydrate crystalline aluminum chloride in a rotary kiln

A technology for crystallizing aluminum chloride and aluminum chloride hexahydrate, which is applied in the preparation of alumina/hydroxide, etc., can solve the problems that the process technology and roasting equipment are not mature and widely used, and achieve the effect of comprehensive utilization

Active Publication Date: 2016-06-01
BEIJING HANGHUA ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process technology and roasting equipment for preparing industrial grade alumina by aluminum chloride hexahydrate are still not mature and widely used.

Method used

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  • A device and method for preparing alumina by roasting hexahydrate crystalline aluminum chloride in a rotary kiln

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Such as figure 1 As shown, a device for preparing alumina by roasting crystalline aluminum chloride hexahydrate in a rotary kiln according to the present invention includes a roasting rotary kiln 1, a cooling kiln 2, a cyclone separator 3, a heavy oil pump 4, a combustion-supporting fan 5, a belt Packaging machine 6 and heavy oil heater 7;

[0021] Among them, the kiln head of the roasting rotary kiln 1 is connected to the combustion-supporting fan 5 and the heavy oil heater 7 through pipelines, the combustion-supporting fan 5 is used to provide air, and the heavy oil heater 7 is used to provide heated heavy oil; the roasting rotary kiln 1 The feeding port at the bottom of the kiln head is connected to the cooling kiln 2; the outlet of the cooling kiln 2 is connected to the belt packaging machine 6;

[0022] The kiln tail part of the roasting rotary kiln 1 communicates with the bottom inlet of the cyclone separator 3 and the feeding pipe 8;

[0023] The upper flue gas...

Embodiment 2

[0027] The method for preparing alumina by roasting hexahydrate crystalline aluminum chloride in a rotary kiln of the device described in Example 1 comprises the steps of:

[0028] (a) Heavy oil (for example: No. 200 heavy oil or other grades of heavy oil) is pressurized by the heavy oil pump 4 to 1.2 ~ 1.6MPa.g (for example: 1.2MPa.g, 1.4MPa.g or 1.6MPa.g) in the heavy oil heater In 7, after being heated by steam heat exchange, it enters the kiln head of the roasting rotary kiln 1, mixes and burns with the air from the self-combustion fan 5 to form flue gas, and forms a temperature of 1100-1300°C at the kiln head of the roasting rotary kiln 1 (for example, : 1100°C, 1200°C or 1300°C) stable temperature field;

[0029] (b) The aluminum chloride hexahydrate crystal material to be roasted is sent into the roasting rotary kiln 1 through the feed pipe 8 from the kiln tail position of the roasting rotary kiln 1; During the movement of the kiln head, the aluminum chloride hexahydra...

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Abstract

The invention provides a device and a method for preparing aluminum oxide by roasting crystalline aluminum chloride hexahydrate in a rotary kiln, wherein the kiln head part of the roasting rotary kiln is connected with a combustion fan and a heavy oil heater by use of pipelines; a feeding hole formed at the bottom end of the kiln head part of the roasting rotary kiln is communicated with a cooling kiln; the outlet of the cooling kiln is communicated with a belt packing machine; the kiln tail part of the roasting rotary kiln is communicated with a bottom ash outlet of a cyclone separator and a feed pipe. The crystalline aluminum chloride hexahydrate material to be roasted is fed into the roasting rotary kiln via the feed pipe from the kiln tail part of the roasting rotary kiln; the crystalline aluminum chloride hexahydrate material goes oppositely to flue gas and has drastic heat and mass transfer reaction with the flue gas, and thus is transformed into an aluminum oxide powder; the aluminum oxide powder is taken as the product and discharged into the cooling kiln. The device and the method are capable of extracting the metallurgical aluminum oxide from the crystalline aluminum chloride successfully; meanwhile, hydrochloric acid can be recovered from the flue gas generated and used for previous sections, and therefore, comprehensive utilization of coal ash is realized.

Description

technical field [0001] The invention belongs to waste comprehensive utilization technology, in particular to a device and method for preparing industrial-grade alumina by roasting hexahydrate crystalline aluminum chloride in a rotary kiln during the comprehensive utilization of fly ash. Background technique [0002] Fly ash is a solid waste discharged from coal-fired power plants, and it is also the industrial solid waste with the largest discharge in my country's industrial field. With the development of the power industry, the discharge of fly ash from coal-fired power plants has increased year by year. Fly ash has become one of the industrial wastes with a large discharge in my country, causing serious damage to the ecological environment. Therefore, it is of great strategic significance to carry out comprehensive utilization of fly ash. [0003] As the second largest metal after iron, aluminum plays an important role in various fields of the national economy. However, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/30
Inventor 钱永康姜振华张范王军侯凤云丁建亮唐山王伟彬罗剑肖伸亮
Owner BEIJING HANGHUA ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD
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