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Method for producing aluminum hydroxide or aluminum oxide by Bayer process

A technology of aluminum hydroxide and aluminum oxide, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of increased unit consumption, achieve the effects of reducing the consumption of ore and alkali, increasing production, and reducing alkali consumption

Inactive Publication Date: 2010-06-16
河南未来铝业(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the traditional production process of aluminum hydroxide or alumina, the caustic ratio α after high-pressure dissolution k It is 1.42~1.47 and the slurry enters the dilution, which is basically adjusted to α by the overflow from the first red mud washing and settling tank k 1.47~1.52, and the mother liquor is basically not used, which will inevitably lead to the increase of various unit consumption

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  • Method for producing aluminum hydroxide or aluminum oxide by Bayer process
  • Method for producing aluminum hydroxide or aluminum oxide by Bayer process

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Embodiment 1

[0010] The method of the present invention is as follows: after bauxite, lime and evaporated mother liquor enter the raw material for grinding to make qualified ore slurry, after pre-desilication, high-pressure dissolution, the slurry α k It is 1.37 and enters the dilution tank. At the same time, the primary washing liquid from the red mud washing (overflow of the primary washing settling tank) and part of the mother liquor (about 20% of the primary washing liquid) are also sent into the dilution tank. Diluted mixed slurry (slurry α k 1.45) sent to the red mud for separation, the obtained overflow was refined into semen through leaf filtration, and the seeds were decomposed; the bottom flow was washed by the red mud and dehydrated to become the discarded red mud; the slurry after the decomposed seeds was separated from the liquid and solid, and the liquid Part of the phase (seeding mother liquor) returns to the dilution tank to participate in the dilution of the high-pressure ...

Embodiment 2

[0012] Bauxite, lime, and evaporated mother liquor enter the raw materials in an appropriate proportion and grind to make a qualified slurry. After pre-desilication, high-pressure dissolution (slurry α k 1.40), enter the dilution tank, and at the same time, the primary washing liquid (overflow of the primary washing settling tank) and part of the mother liquor (about 40% of the primary washing liquid) from the red mud washing are also sent into the dilution tank. Fully dilute the mixed slurry (slurry α k 1.48) sent to the red mud for separation, the obtained overflow was refined into semen by leaf filtration, and the seeds were decomposed; the bottom flow was washed by the red mud and dehydrated to become the discarded red mud; the slurry after the decomposed seeds was separated from the liquid and solid, and the liquid Part of the phase (seeding mother liquor) returns to the dilution tank to participate in the dilution of the high-pressure dissolution slurry, and the other pa...

Embodiment 3

[0014] Bauxite, lime, and evaporated mother liquor enter the raw materials in an appropriate proportion and grind to make a qualified slurry. After pre-desilication, high-pressure dissolution (slurry α k 1.45), enter the dilution tank, and at the same time, the primary washing liquid (overflow of the primary washing settling tank) and part of the mother liquor (about 60% of the primary washing liquid) from the red mud washing are also sent into the dilution tank. Fully dilute the mixed slurry (slurry α k is 1.50) sent to the red mud for separation, and the obtained overflow is refined into semen by leaf filtration, and the seeds are decomposed; the bottom flow is dehydrated after being washed by the red mud to become the discarded red mud; the slurry after the decomposed seeds is separated from the liquid and solid, and the Part of the phase (seeding mother liquor) returns to the dilution tank to participate in the dilution of the high-pressure dissolution slurry, and the othe...

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Abstract

The invention relates to a method for producing aluminum hydroxide or aluminum oxide by use of Bayer process, which is characterized in that the caustic ratio Alpha k of the slurry stripped under highpressure is 1.37 to 1.45, the seed precipitation solution produced after the separation of aluminum hydroxide is used in the dilution process, and the caustic ration of diluted slurry Alpha k is ranging between 1.45 and 1.50. By adopting the seed precipitation solution as the absorption medium, and increasing the circulation efficiency of aluminum oxide and alkali to improve the recovery rate ofthe aluminum oxide, the production method for aluminum hydroxide or aluminum oxide has the advantages of improving the yield of aluminum hydroxide or aluminum oxide, and reducing the consumption of ore and alkali, as well as enjoying great social and economic value, and facilitating the popularization and application.

Description

technical field [0001] The invention relates to a method for producing aluminum hydroxide or aluminum oxide by Bayer process. Background technique [0002] Reducing energy consumption has become the main research direction in the production of aluminum hydroxide or alumina. In the traditional production process of aluminum hydroxide or alumina, the caustic ratio α after high-pressure dissolution k It is 1.42~1.47 and the slurry enters the dilution, which is basically adjusted to α by the overflow from the first red mud washing and settling tank k 1.47~1.52, and the mother liquor of seed separation is basically not utilized, which will inevitably lead to the increase of various unit consumption. The caustic ratio refers to the molar ratio of caustic soda contained in the stock solution to alumina, represented by the symbol αk, which is an important technical indicator in the Bayer alumina production process. All alumina plants in my country use diaspore as the main raw mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 段晶黎何小涛贺长运
Owner 河南未来铝业(集团)有限公司