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Method for systemically improving efficiency of low-grade bauxite Bayer-method process

A low-grade bauxite and Bayer process technology, applied in alumina/aluminum hydroxide and other directions, can solve the problem of high alkali consumption, and achieve the effects of low alkali consumption, low ore consumption and high process efficiency

Inactive Publication Date: 2018-11-23
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to solve the technical problems of low efficiency of the Bayer process and high alkali consumption in the process of producing alumina from medium and low-grade bauxite, and provide a method that can effectively reduce the alkali consumption of the process of producing alumina from medium- and low-grade bauxite and greatly increase New Process Technology for the Efficiency of the Bayer Process to Produce Alumina

Method used

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  • Method for systemically improving efficiency of low-grade bauxite Bayer-method process

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Effect test

Embodiment 1

[0043] Al in Bauxite 1 2 o 3 Content is 61.58%, SiO 2 The content is 12.89%, Fe 2 o 3 The content is 4.85%, the A / S is 4.77, and the caustic alkali concentration N k 280g / L, α k The 5.90% circulating mother liquor dissolves bauxite 1 to obtain a stripping slurry, and the stripping liquid α k It is 1.42, the amount of lime added is 6%, the dissolution temperature is 250°C, the dissolution time is 120min, the A / S of the dissolved red mud is 1.01, and the N / S of the dissolved red mud is 0.60. The stripping slurry is sequentially subjected to dilution, sedimentation, separation and fine filtration to obtain α k It is the Bayer method semen of 1.47, and the semen is obtained through the treatment processes such as seed crystal decomposition process and solid-liquid separation under conventional Bayer method seed separation conditions to obtain the decomposition product aluminum hydroxide and decomposition mother liquor. N can be obtained after the mother liquor is evaporated...

Embodiment 2

[0045] Al in Bauxite 1 2 o 3 Content is 61.58%, SiO 2 The content is 12.89%, Fe 2 o 3 The content is 4.85%, the A / S is 4.77, and the caustic alkali concentration N k 275g / L, α k 5.19 The circulating mother liquor dissolves bauxite 1 to obtain the stripping slurry, and the stripping liquid α k It is 1.42, the amount of lime added is 10%, the dissolution temperature is 280°C, the dissolution time is 20min, the A / S of the dissolved red mud is 1.10, and the N / S of the dissolved red mud is 0.45. The red mud slurry is sequentially diluted, settled, separated and finely filtered to obtain α k It is the Bayer method semen of 1.47, and the semen is obtained through the treatment processes such as seed crystal decomposition process and solid-liquid separation under conventional Bayer method seed separation conditions to obtain the decomposition product aluminum hydroxide and decomposition mother liquor. The mother liquor is evaporated and concentrated to obtain N k 320g / L, α ...

Embodiment 3

[0047] Al in Bauxite 2 2 o 3 Content is 43.58%, SiO 2 The content is 16.89%, Fe 2 o 3 The content is 9.85%, the A / S is 2.58, and the caustic concentration N k 180g / L, α k The circulating mother liquor of 9.55% dissolves the bauxite 2 to obtain the stripping slurry, and the stripping liquid α k 1.42, lime addition 12%, dissolution temperature 270°C, dissolution time 50min, dissolution red mud A / S 1.20, dissolution red mud N / S 0.30. The red mud slurry is sequentially diluted, settled, separated and finely filtered to obtain α k It is the Bayer method semen of 1.47, and the semen is obtained through the treatment processes such as seed crystal decomposition process and solid-liquid separation under conventional Bayer method seed separation conditions to obtain the decomposition product aluminum hydroxide and decomposition mother liquor. The mother liquor is evaporated and concentrated to obtain N k 140g / L, α k 3.02 evaporation mother liquor, the evaporation mother liqu...

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Abstract

The invention discloses a method for systemically improving the efficiency of a low-grade bauxite Bayer-method process and relates to improvement of a technology of producing aluminum oxide through aBayer method. The method is characterized in that a main technological process comprises the following steps: 1) dissolving out bauxite by utilizing a circulating mother solution; 2) treating a Bayerseed precipitation steaming mother solution by utilizing a cationic membrane diffusion dialysis separator to obtain a low-alphak sodium aluminate solution and a high-alphak sodium aluminate solution;conveying the low-alphak sodium aluminate solution into a Bayer seed precipitation procedure, and carrying out secondary crystal seed decomposition; 3) mixing the high-alphak sodium aluminate solutionof step 2), supplemented liquid alkali, lime and a Bayer red mud filter cake to prepare alkaline red mud; carrying out leaching treatment on the alkaline red mud at room temperature to obtain red mudhigh-temperature leaching residues and red mud high-temperature leaching liquid. The method is suitable for treating middle-grade and low-grade bauxite with the A / S of 2.50 to 7.00 and has the advantages of high efficiency of a production process, low ore consumption and low alkali consumption; the A / S of the discharged high-temperature leaching residues is 0.50 to 0.90, the N / S is less than or equal to 0.15 and the total decomposition rate of a seed precipitation process is greater than or equal to 68 percent.

Description

technical field [0001] The invention belongs to the technical field of alumina production technology, and in particular relates to a method for systematically improving the efficiency of the Bayer process of middle and low-grade bauxite. Background technique [0002] In 2017, my country has identified bauxite reserves of about 1 billion tons, but most of them are low-grade bauxite with A / S not exceeding 5.0. In recent years, with the rapid development of my country's alumina industry, the supply of bauxite has become increasingly tight, and the A / S of some enterprises has dropped to below 5.0. The decline of bauxite grade will have the following consequences on the alumina production process: the output will decrease and the energy consumption will increase due to the decrease of cycle efficiency, output rate and energy efficiency; The increase in the amount of mud, coupled with the rapid increase in output, has caused great pressure on environmental protection; and the inc...

Claims

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Application Information

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IPC IPC(8): C01F7/02
CPCC01F7/02
Inventor 尹中林武国宝路晓涛齐利娟
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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