Method and device for removing organic matters in aluminum oxide mother liquor with assistance of aluminum ash sintering process

A sintering method and alumina technology, which is applied in the field of metallurgical aluminum production, can solve problems such as difficult operation, difficult regeneration, and high cost of additive consumption

Active Publication Date: 2018-11-13
YUNNAN WENSHAN ALUMINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is aimed at the existing crystallization method, oxidation method, roasting method, ion exchange method, causticization method, etc. for removing organic matter in alumina. These methods all have high cost of additive consumption, d

Method used

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  • Method and device for removing organic matters in aluminum oxide mother liquor with assistance of aluminum ash sintering process
  • Method and device for removing organic matters in aluminum oxide mother liquor with assistance of aluminum ash sintering process
  • Method and device for removing organic matters in aluminum oxide mother liquor with assistance of aluminum ash sintering process

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Experimental program
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Effect test

Embodiment 1

[0046] Such as figure 1 As shown, the device for synergistically removing organic matter in alumina mother liquor by aluminum ash sintering method includes a rotary kiln 1, a cyclone separator 12, and a cooler. One end of the rotary kiln 1 is the kiln head 2, and the other end is the kiln tail 3. The discharge port is connected to the feed port of the cooling machine through the cooling pipe 8, the discharge port of the kiln tail 3 is connected to the feed port of the cyclone separator 12 through the tail gas recovery pipe 11, the rotary kiln 1 is set obliquely, and the kiln head 2 is located in the kiln Below the tail 3, the fuel inlet of the kiln head 2 is connected to the fuel pipe 7, the air inlet of the kiln head 2 is connected to the air pipe 6, the raw meal inlet of the kiln tail 3 is connected to the raw meal pipe 4, and the raw meal pipe 4 is located at the kiln tail One end in 3 is provided with shower head 5.

[0047] In use, the raw slurry, fuel and air are passed...

Embodiment 2

[0058] Based on Example 1, such as image 3 As shown, a movable rod 16 is arranged at the bottom of the rotary kiln 1, and a scraper 18 is arranged on the movable rod 16, and one end of the movable rod 16 passes through the kiln tail 3. The other end of the movable rod 16 is located in the rotary kiln 1 and is tapered. The bottom of the scraper 18 is in contact with the inner wall of the rotary kiln 1 , and the end of the scraper facing the kiln head 2 is tapered. The kiln tail 3 is provided with a sealing ring 17, and the movable rod 16 passes through the sealing ring 17.

[0059] In use, a large amount of oxidized intermediate products are precipitated during the entire reaction of the combustion method to remove the organic matter in the alumina mother liquor, which will be adsorbed on the inner wall of the rotary kiln. If it is not cleaned for a long time, the problem of rotary kiln blockage will easily occur. , so that it can scrape off the oxide at the bottom of the inn...

Embodiment 3

[0062] Based on Example 1, the outlet at the bottom of the kiln tail 3 is connected to the ash collection pipe 9, the fuel pipe 7 is provided with a first control valve 14, the air delivery pipe 6 is provided with a fan 13, and the cooling pipe 8 is provided with a second control valve. The control valve 15 is provided with a third control valve 19 on the raw material pipe 4 .

[0063] During use, the ash collecting pipe provided can recycle the α-alumina produced by the reaction, and the flow of each pipe can be controlled through the provided first control valve, second control valve and third control valve.

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Abstract

The invention relates to the field of metallurgical aluminum preparation and discloses a method and a device for removing organic matters in aluminum oxide mother liquor with assistance of an aluminumash sintering process. The method is characterized by comprising the following steps: guiding raw material slurry into a rotary kiln through a raw material pipe; guiding natural gas and air into therotary kiln through a fuel pipe and an air pipe respectively for a sintering reaction; guiding clinker obtained by the sintering reaction into a cooling machine through a cooling pipe; finally, feeding the clinker cooled by the cooling machine into a ball mill through a conveyor; adding aluminum oxide evaporation mother liquor and sintering again to finish removal of organic matters in the aluminum oxide mother liquor; thus, inert aluminum ash in the aluminum ash can be safely and effectively treated, total recovery rate of aluminum in the aluminum ash reaches 95% or more, overall recovery rate of organic matters is 85% or more, and the problems of high consumption and cost of additives, difficulty in operation and implementation, difficulty in regeneration and low recovery efficiency of existing methods such as crystallization, oxidation, roasting, ion exchange and causticization for removing organic matters in aluminum oxide are solved.

Description

technical field [0001] The invention relates to the field of metallurgical aluminum production, in particular to a method and a device for synergistically removing organic matter in alumina mother liquor by aluminum ash sintering. Background technique [0002] The metallurgical aluminum industry needs to produce alumina by Bayer process, and CO in ore and lime 2 In the production process, it reacts with NaOH to form Na 2 CO 3 and part of Na 2 C 2 o 4 , the gradual accumulation will reduce the cycle efficiency, increase the production cost, and will be precipitated on the equipment and pipelines, affecting the normal production. Therefore, the organic matter produced in the process of producing alumina by the Bayer method must be removed after it reaches a certain concentration, so as to keep it at a certain concentration. lower level. The existing treatment methods mainly include the following types: crystallization method, oxidation method, roasting method, ion exchan...

Claims

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Application Information

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IPC IPC(8): C01F7/46C01F7/06
CPCC01F7/06C01F7/46
Inventor 郝红杰赵加平董庭鸿刘定明车立志高云川晏华钎杨德荣唐绍华李俊福王红光罗俊松朱扬昆谭云川陈映
Owner YUNNAN WENSHAN ALUMINUM
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