Salt discharging system and method in Bayer-process aluminium oxide production process

A technology for production process and salt discharge system, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of high requirements for equipment and pipes, high energy consumption, high maintenance costs, and reduce energy consumption, save steam, and reduce usage. Effect

Inactive Publication Date: 2015-11-04
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology needs to configure special evaporator equipment, use steam for heating and concentration, and use electric energy for forced circulation, which consumes a lot of energy.
At the same time, due to the high concentration and strong corrosion of the solution, the requirements for equipment and pipes are high, and the maintenance cost is high.

Method used

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  • Salt discharging system and method in Bayer-process aluminium oxide production process
  • Salt discharging system and method in Bayer-process aluminium oxide production process
  • Salt discharging system and method in Bayer-process aluminium oxide production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The salt discharge system of the Bayer method alumina production process of the present invention comprises a strong alkali storage tank 1, a salt settling tank 2, an overflow tank 3, a circulating mother liquor tank 4, a filtering device 5 and a causticizing system 6, in the alumina production process The discharge pipe of the evaporation station is connected with the strong alkali storage tank 2 and the circulating mother liquor tank 5 respectively; The upper part of the salt settling tank 2 is provided with an overflow pipe 7, and the bottom is provided with an underflow outlet 8. The overflow pipe 7 communicates with the overflow tank 3, and the underflow outlet 8 passes through the filter device 5 and communicates with the To the causticizing system 6; the outlet of the overflow tank 3 communicates with the circulating mother liquor tank 4 through a pump and a pipeline.

[0024] The salt discharge method of the Bayer process alumina production process of the presen...

Embodiment 2

[0036] The salt discharge system of the Bayer method alumina production process of the present invention comprises a strong alkali storage tank 1, a salt settling tank 2, an overflow tank 3, a circulating mother liquor tank 4, a filtering device 5 and a causticizing system 6, in the alumina production process The discharge pipe of the evaporation station is connected with the strong alkali storage tank 2 and the circulating mother liquor tank 5 respectively; The upper part of the salt settling tank 2 is provided with an overflow pipe 7, and the bottom is provided with an underflow outlet 8. The overflow pipe 7 communicates with the overflow tank 3, and the underflow outlet 8 passes through the filter device 5 and communicates with the To the causticizing system 6; the discharge port of the overflow tank 3 communicates with the circulating mother liquor tank 4 through a pump and a pipeline.

[0037] The salt discharge method of the Bayer process alumina production process of th...

Embodiment 3

[0049] Contrast test: compare the salt removal effects before and after using the salt removal method of the present invention.

[0050] Before the test, the evaporation workshop used forced heating to increase the concentration of the sodium aluminate solution to crystallize the carbonate in the solution; during the test, the evaporation workshop used the mother liquor discharged from the evaporation station as the solution to dissolve the solid sodium hydroxide, and the dissolved The mixed solution (Nk concentration ≥ 320g / l, t ≥ 90°C) is sent to the third-stage salt settling tank for sedimentation and separation, the underflow salt filter is sent to the salt discharge operation, and the overflow is returned to the mother liquor tank as a strong alkali solution for deployment. During the test period, the four-stage coercion was stopped, and the mixed solution and the three-stage coercive output entered the third-stage salt settlement tank together. The whole test lasted 20 da...

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PUM

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Abstract

A disclosed salt discharging system in a Bayer-process aluminium oxide production process comprises a strong-base storage tank, a salt settling tank, an overflow tank, a circulating mother liquor tank, filtering equipment and a causticization system; an evaporator-station discharging pipe in the aluminium oxide production process is communicated respectively with the strong-base storage tank and the circulating mother liquor tank; a discharge port of the strong-base tank is communicated with a feed inlet of the salt settling tank via a pump and a pipeline; the upper part of the salt settling tank is provided with an overflow pipe, and the bottom of the salt settling tank is provided with a bottom flow outlet; the overflow pipe is communicated with the overflow tank, and the bottom flow outlet is communicated with the causticization system via the filtering equipment; and a discharge port of the overflow tank is communicated with the circulating mother liquor tank via a pump and a pipeline. The invention also discloses a salt discharging method in the Bayer-process aluminium oxide production process, and the salt discharging system in the Bayer-process aluminium oxide production process is employed. Two functions such as alkali supplement and salt discharging during aluminium oxide production are both provided, running time of a forced circulation evaporator is reduced during aluminium oxide production, and energy consumption and equipment maintenance cost are reduced.

Description

technical field [0001] The invention belongs to the field of alumina production, and in particular relates to a salt discharge system and method in the production process of Bayer process alumina. Background technique [0002] During the production of Bayer alumina, the sodium aluminate solution contains a large amount of impurities such as sodium carbonate, sodium sulfate, and sodium aluminosilicate. Sodium carbonate is one of the most important impurities. If the concentration is too high, crystals will be precipitated under specific conditions, resulting in a decrease in the heat transfer coefficient of the heat exchanger in the system, pipe blockage and other hazards, which will have a huge impact on equipment efficiency and production continuity. influences. The source of sodium carbonate is mainly the raw materials required for production such as bauxite and lime. If it accumulates for a long time and is not eliminated, it will bring serious harm to the entire alumina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 邹勇明覃剑陆敏陈传新吴海文李友元陆超黄浩黄柄梅刘永红党书勇
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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