Method of Bayer process alumina factory dissolution and evaporation combined process

A combined process, Bayer process technology, applied in chemical instruments and methods, preparation of aluminum compounds, alkali metal aluminate/alumina/aluminum hydroxide, etc. Use and other issues to achieve the effects of reducing equipment investment, saving steam consumption, and fully utilizing heat

Inactive Publication Date: 2020-03-31
GUIYANG AL-MG DESIGN & RES INST
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  • Description
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Problems solved by technology

When the boiling point rises so high, it is difficult for the positive pressure flash to continue to reduce the temperature of the pulp and recover heat energy. If vacuum flash is used, the temperature of the dissolution feed pulp is too high, and the secondary steam generated by vacuum flash is difficult to be effectively utilized.

Method used

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  • Method of Bayer process alumina factory dissolution and evaporation combined process

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Embodiment 1

[0015] The dissolution process is equipped with seven-stage preheating sleeves, first-stage fresh steam condensate heating sleeves, and first-stage fresh steam heating sleeves. The stripped slurry is heated to the stripping temperature through the casing, and then enters the thermal retention reaction tube. After the reaction is completed, the eleven-stage flash evaporation is performed to cool down. The first seven-stage flash secondary steam is used to heat the dissolved slurry, and the last four-stage flash secondary steam Enter the first, second, third, and four-effect evaporator in sequence. The evaporator is still fed with four or six effects, and the distribution ratio is 60% for four effects and 40% for six effects. The solution entering the six-effect evaporator is discharged after passing through the six-effect and five-effect evaporator in sequence. The solution entering the four-effect evaporator passes through four, three, two, one-effect evaporators and three-sta...

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Abstract

The invention discloses a method of a Bayer process alumina factory dissolution and evaporation combined process. According to the method, the dissolution process and the evaporation process of a Bayer process alumina factory are integrated into a new process, and the heat energy of dissolved ore pulp is further recovered and utilized by utilizing the temperature difference between the dissolutionprocess and the evaporation process. According to the invention, two steam consumption systems of evaporation and dissolution are combined together to establish a new heat balance system so as to obtain a relatively simple process, so that the Bayer process for producing aluminum oxide is efficient, reliable and energy-saving.

Description

Technical field [0001] The invention relates to the technical field of the production of alumina by the Bayer process, in particular to a method for the combined dissolution and evaporation process of the Bayer process alumina plant. Background technique [0002] The important basic raw material industries for the development of the national economy are alumina and metal aluminum industries. More than 90% of the total industrial alumina output in the market comes from the electrolytic production of metal aluminum. Metal aluminum has a wide range of applications, such as pharmaceuticals, ceramics, petroleum, electronics, chemicals, refractories, and environmental protection. [0003] Reducing the energy consumption of the alumina production process has always been an important research topic in the field of alumina production. In China, the bauxite used by enterprises that produce alumina by the Bayer process is usually diaspore, and the required dissolution temperature generally r...

Claims

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Application Information

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IPC IPC(8): C01F7/06
CPCC01F7/06C01F7/062
Inventor 倪阳李斌白英伟李荣华蔡安
Owner GUIYANG AL-MG DESIGN & RES INST
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