Bayer process for producing sandy alumina
A technology of alumina and Bayer process, applied in alumina/aluminum hydroxide and other directions, can solve the problems of periodicity, explosive refinement, particle size index decline of aluminum hydroxide, unable to meet the production needs of sandy alumina, etc. Good effect of reducing cost and increasing efficiency
Active Publication Date: 2015-04-29
中铝山东有限公司
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide a method for producing sandy alumina by the Bayer process, and to solve the problem of periodic and explosive refinement of aluminum hydroxide that exists in the prior art to produce sandy alumina using only one-stage method or two-stage method , resulting in a sharp decline in the particle size index, which cannot meet the production demand of sandy alumina
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[0012] The embodiment of the present invention provides a method for producing sandy alumina by the Bayer process, comprising: adopting a one-stage method for production when the particle size of aluminum hydroxide is coarse, and adopting a two-stage method for production when the particle size is fine. The particle size coarsening stage and fine stage are judged by particle size analyzer, molecular sieve and microscope. When the seed is discharged, when the mass percentage of particles below 45 microns in the aluminum hydroxide crystal seed is less than 12%, it is the particle size coarsening period; When the particle content is greater than 18%, it is the particle size refinement period; when the mass percentage of particles below 45 microns in the discharged aluminum hydroxide seed crystal is between 12-18%, it is judged by 20 microns, when the particles below 20 microns The mass percentage is less than 2% is the coarsening period, and more than 2% is the refining period. A...
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The invention discloses a Bayer process for producing sandy alumina. The Bayer process comprises the following steps: adopting a primary stage method for coursing the grain size of aluminum hydroxide and adopting a secondary stage method for fining the grain side of the aluminum hydroxide. According to the Bayer process for producing the sandy alumina, the characteristics of the primary stage method and the secondary stage method are combined, a decomposition technology of flexibly switching the primary stage method and the secondary stage method is implemented, a long low-temperature stage decomposition control technology and a concept of reasonably adjusting the decomposition temperature gradient and solid content according to grain size distribution of the aluminum hydroxide in a seed precipitation tank are provided, the capacity of the decomposition tank and the quality of the aluminum hydroxide product are well controlled, and good effects of reducing cost and increasing efficiency of producing the aluminum hydroxide are achieved.
Description
technical field [0001] The invention relates to the technical field of alumina production, in particular to a new decomposition process for producing sandy alumina, which solves the problem of fluctuations in the particle size of alumina and stabilizes the index of sandy alumina. Background technique [0002] The production of alumina by the Bayer process mainly includes four major processes: dissolution, sedimentation, decomposition, and evaporation. The index of sandy alumina—the particle size of alumina product is an important quality index in alumina production, which mainly depends on the technical control of the decomposition process. At present, there are mainly two kinds of decomposition technology for producing sandy alumina in the world: one-stage method and two-stage method. The one-stage method means that the crystal seeds used for decomposition do not distinguish between coarse and fine crystal seeds, and all the crystal seeds and the original decomposition solu...
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IPC IPC(8): C01F7/02
Inventor 钱记泽温金德李新华郝云飞秦念勇刘延静李福强张海涛王红鹏
Owner 中铝山东有限公司