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Bauxite dissolution process

A bauxite and process technology, applied in the field of bauxite dissolution process, can solve the problems of high cost, unfavorable economic performance, waste of alumina and alkali, and increased production cost, so as to improve the dissolution effect, improve recovery rate, and improve Effect of silicon volume index

Active Publication Date: 2020-07-14
重庆市九龙万博新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the bauxite used by our company is relatively expensive and of good quality. Although the dissolution can be completed by the series method (the general name of Bayer method and sintering method), the high cost is not conducive to improving economic performance; in order to reduce our alumina production cost, it is planned to fully use Australian mines
According to estimates, according to the current production mode, the sintering method can only recover 60% of Bayer red mud, and the red mud with high alumina content and high sodium oxide content will be discharged and stored, resulting in waste of alumina and alkali, resulting in increased production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of leaching process of bauxite, comprising such as figure 1 Steps shown:

[0029] Step 1: Select bauxite and caustic lye to mix and grind to make slurry, and obtain a stripping slurry from seven stripping units 1 and eight stripping units 2 after heating. The stripping slurry mainly includes sodium aluminate solution and red mud , the temperature of the one-stage stripping pulp is between 120-140°C, and the stripping temperature in this embodiment is 120°C. The ore quality of bauxite is shown in the table below:

[0030]

[0031] Step 2: After entering the No. 1 post-dissolution tank 3 and No. 2 post-dissolution tank 4, the one-stage stripping pulp is mixed with the stripping pulp produced by the one-stage stripping and diluted with sintering crude liquid, and transported through the pipeline by a slurry pump of model 150LZ-500JM3 Settling tank No. 1 in the third phase and No. 2 settling tank 7 in the third phase are settled and separated to obtain a section...

Embodiment 2

[0038] The extraction of alumina from bauxite by the Bayer process includes two processes, one is the dissolution described in Example 1, and the second is decomposition, that is, adding hydroxide to the obtained sodium aluminate solution under the condition of dilution and cooling Aluminum acts as a seed crystal to decompose and precipitate aluminum hydroxide. The current common treatment method is to directly add the seed crystals to the filter cake tank and mix them with sodium aluminate solution, but the particle size of the seed crystals is relatively large, and the mixing effect is not good.

[0039] Based on this, if figure 2 As shown, frame and stirring mechanism are set in filter cake tank 5, and stirring mechanism comprises motor 100, stirring shaft 101 and stirring blade 102, and the model of motor 100 is MR-J2S-100A, and motor 100 is fixed on the frame, The output shaft of the motor 100 is arranged vertically downward, the stirring shaft 101 is connected in the f...

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Abstract

The invention relates to the field of bauxite dissolution, in particular to a bauxite dissolution process which comprises the following steps: step 1, mixing and grinding bauxite and alkali liquor into ore pulp, and obtaining first-stage dissolution ore pulp through heating; 2, diluting the first-stage dissolved ore pulp, and carrying out settling separation to obtain a first-stage overflow liquidand a first-stage separation underflow; 3, after pre-desilicication is conducted on the first-stage separation underflow matched with the high-temperature alkali liquor and the ore pulp, obtaining second-stage dissolution ore pulp through heating; 4, enabling the second-stage dissolved ore pulp to be diluted and subjected to sedimentation separation after being self-diluted, and obtaining second-stage washing liquor; and 5, refluxing the second-stage washing liquid and diluting the first-stage dissolved ore pulp in the step 2, and diluting and self-diluting the second-stage dissolved ore pulpin the step 4. When the technical scheme is adopted, the recovery rate of aluminum oxide and alkali can be improved.

Description

technical field [0001] The invention relates to the field of bauxite dissolution, in particular to a bauxite dissolution process. Background technique [0002] The Bayer process is a chemical process widely used in industry to produce alumina from bauxite. The basic principle is to convert aluminum hydroxide into sodium aluminate with concentrated sodium hydroxide solution, by diluting and adding aluminum hydroxide seed crystals Aluminum hydroxide is re-precipitated, and the remaining sodium hydroxide solution is reused to process the next batch of bauxite, thereby realizing continuous production. [0003] At present, the bauxite used by our company is relatively expensive and of good quality. Although the dissolution can be completed by the series method (the general name of Bayer method and sintering method), the high cost is not conducive to improving economic performance; in order to reduce our alumina production cost, it is planned to fully use Australian mines. Accor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/06
CPCC01F7/06
Inventor 汪小波章丽娜柳联伟王志强
Owner 重庆市九龙万博新材料科技有限公司
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