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Bauxite stripping process by Bayer process

A bauxite and Bayer process technology, applied in the field of Bayer process dissolution process of bauxite, can solve the problems of short thermal insulation reaction dissolution time, increased system resistance, large power consumption, etc. high rate effect

Inactive Publication Date: 2007-03-28
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To achieve the dissolution effect within a few minutes, it is bound to increase the dissolution temperature at the expense of, especially for bauxite that is difficult to dissolve, it is uneconomical, the energy consumption is large, and the cost is high
[0011] The method (4) of the indirect heating dissolution process also has a casing heat preservation reaction dissolution section. Due to the limitation of the length of the casing, the heat preservation reaction dissolution time is short, only a few minutes, and has little effect on the dissolution process, and increases The resistance of the system is increased, and the power consumption is relatively large

Method used

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  • Bauxite stripping process by Bayer process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] As shown in Figure 1, the gibbsite-type bauxite is ground with part of the circulating lye and lime to make bauxite slurry T2 with a solid content of 600g / l. The bauxite slurry T2 is indirectly heated to 100°C and then enters the pre-desilication A. Pre-desilicate for 8 hours, and then add the rest of the circulating lye T1 and pump it into the three-stage preheating sleeve heat exchanger B for preheating, and the multi-stage heating sleeve heat exchanger C is heated to the dissolution temperature with the heat source T3, and then heated Afterwards, heat preservation reaction dissolution is carried out in tank-type pressure cooking heat preservation reaction dissolution D, and after dissolution, it enters the third-stage flash evaporation E to flash and cool down. After flash evaporation, the dissolution process is completed to obtain the dissolved ore pulp T0.

[0034] The heat source T3 that provides heat for the above process is saturated steam or molten salt that can...

Embodiment 2

[0038] As shown in Figure 1, the boehmite-type bauxite is ground with part of the circulating lye and lime to make an aluminum ore slurry T2 with a solid content of 300g / l, and the aluminum ore slurry T2 is heated to 100°C through a single-tube heat exchanger Then enter the pre-desilication A for 6 hours pre-desilication, and then add the circulating lye T1 and send it to the ten-stage preheating sleeve heat exchanger B for preheating with a diaphragm pump, and then enter the multi-stage heating sleeve heat exchanger C Heat up to the dissolution temperature with a heat source T3. After heating, carry out heat preservation reaction dissolution in tank pressure cooking heat preservation reaction dissolution D. After dissolution, perform flash evaporation and cooling in ten-stage flash evaporation E to complete the dissolution process to obtain dissolved ore pulp T0.

[0039] The discharge temperature of the final flash evaporation is 125°C. The secondary steam generated by each s...

Embodiment 3

[0043] As shown in Figure 2, diaspore-type bauxite is milled with a small portion of circulating lye and lime to make aluminum ore slurry T2 with a solid content of 900g / L, which is heated to 100°C by a single-tube heat exchanger and then enters the pre-dehydration process. Pre-desiliconization is carried out in silicon A for 6 hours, and the aluminum ore slurry after pre-desiliconization is pumped into the seven-stage preheating sleeve heat exchanger B for preheating to 180°C (pulp flow).

[0044] Most of the circulating lye T1 is sent to the ten-stage preheating casing heat exchanger B by a diaphragm pump for preheating, and then enters the multi-stage heating casing heat exchanger C to be heated to 275°C with a heat source T3 (alkali flow) .

[0045] The above-mentioned pulp flow at 180°C and alkali liquor flow at 275°C are mixed in tank-type pressure cooking heat preservation reaction dissolution D and directly heated to 265°C heat preservation reaction dissolution with su...

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Abstract

The invention relates to a Bayer method digesting technology for bauxite that includes the following steps: taking preheating and heating for aluminum ore slurry after taking pre-desilication process and cycling alkaline liquor in the double pipe heat exchanger, heating to digesting temperature and taking heat insulation reaction for digesting in pot autoclave, and taking explosive boiling cooling to gain digesting ore slurry. The invention has the advantages of good digesting effect, light heat exchanger scar over, low constructing cost, low producing cost, etc.

Description

technical field [0001] The present invention relates to the Bayer stripping process of bauxite, in particular to a Bayer stripping process applicable to diaspore type, boehmite type, gibbsite type and mixed type bauxite, It is suitable for single-flow and double-flow Bayer process dissolution of bauxite. Background technique [0002] The single-flow method means that all the lye used for dissolution is mixed with bauxite and lime to form aluminum ore slurry and enter the dissolution process. In this process, indirect heating is used. It is suitable for the dissolution process where the formation of scarring in the high temperature heat exchange section is relatively light. [0003] The double-flow method means that most of the lye used for dissolution is indirectly heated to a higher temperature, and the remaining lye is mixed with bauxite and lime to prepare a high-solid aluminum-containing slurry, which is pre-desiliconized and indirectly heated to a lower temperature. I...

Claims

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Application Information

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IPC IPC(8): C22B3/12
CPCY02P10/20
Inventor 郭焕雄廖新勤周凤禄
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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