Method for producing aluminum hydroxide or aluminum oxide by Bayer process

A technology of aluminum hydroxide and aluminum oxide, which is applied in the direction of alumina/aluminum hydroxide, can solve the problems of increased unit consumption, achieve the effects of reducing the consumption of ore and alkali, easy promotion and application, good social value and economic value

Inactive Publication Date: 2008-09-17
河南未来铝业(集团)有限公司
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  • Abstract
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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

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Embodiment 1

[0010] The method of the present invention is as follows: after bauxite, lime and evaporation mother liquor enter the raw material to be ground into a qualified slurry, pre-desiliconization, high-pressure dissolution, the slurry α k At 1.37, it enters the dilution tank. At the same time, the primary washing liquid from the red mud washing (the overflow of the primary washing sedimentation tank) and part of the seed mother liquor (about 20% of the primary washing liquid) are also sent to the dilution tank. Dilute and mix the slurry (slurry α k 1.45) is sent to the red mud separation, the obtained overflow is refined into semen through leaf filtration, and the seeds are decomposed; the bottom flow is washed with the red mud and then dehydrated to become the discarded red mud; the slurry after the decomposition of the seeds is separated from the liquid and solid, and the liquid is separated. Part of the phase (seed mother liquor) is returned to the dilution tank to participate in the...

Embodiment 2

[0012] Bauxite, lime, and evaporation mother liquor enter the raw material grinding in an appropriate proportion to make a qualified slurry, which is pre-desiliconized and dissolved out under high pressure (slurry α k 1.40), enter the dilution tank, and at the same time the primary washing liquid from the red mud washing (the overflow of the primary washing sedimentation tank) and part of the seed mother liquor (about 40% of the primary washing liquid) are also sent to the dilution tank. Fully dilute the mixed slurry (slurry α k 1.48) is sent to the red mud separation, the obtained overflow is refined into semen through leaf filtration, and sent to the seeds to decompose; the bottom flow is washed by the red mud and then dehydrated to become the discarded red mud; the slurry after the decomposition of the seeds is separated from the liquid and the solid. Part of the phase (seed mother liquor) is returned to the dilution tank to participate in the dilution of the high-pressure diss...

Embodiment 3

[0014] Bauxite, lime, and evaporation mother liquor enter the raw material grinding in an appropriate proportion to make a qualified slurry, which is pre-desiliconized and dissolved out under high pressure (slurry α k 1.45), enter the dilution tank, and at the same time the primary washing liquid from the red mud washing (the overflow of the primary washing sedimentation tank) and part of the seed mother liquor (about 60% of the primary washing liquid) are also sent to the dilution tank. Fully dilute the mixed slurry (slurry α k Is 1.50) sent to the red mud separation, the obtained overflow is refined into semen through leaf filtration, and sent to the seeds for decomposition; the bottom flow is washed by the red mud and then dehydrated to become the discarded red mud; the slurry after the decomposition of the seeds is separated from the liquid and solid, and the liquid Part of the phase (seed mother liquor) is returned to the dilution tank to participate in the dilution of the hi...

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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 high pressure 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 of the 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 the 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 aluminum oxide, the causticity ratio after high pressure dissolution is α k The 1.42~1.47 slurry enters the dilution, which is basically adjusted to α by the overflow from the red mud washing settling tank k 1.47~1.52, and the mother liquor of seed fraction is basically not used, which will inevitably cause various unit consumption increases. The caustic ratio refers to the molar ratio of caustic alkali to alumina contained in the stock solution. It is represented by the symbol αk. It is an important technical indicator in the Bayer process alumina production process. All alumina plants in my country use diaspore as the main raw material. The B...

Claims

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Application Information

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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
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