Method and equipment for vaporizing full flash distillation of sodium aluminate liquor in technique for producing alumina

A technology of sodium aluminate and alumina, which is applied in the preparation of alumina/aluminum hydroxide, alkali metal aluminate/alumina/aluminum hydroxide, etc., which can solve the problems of high steam consumption, high equipment price and low equipment operation rate and other problems, to achieve the effect of reducing engineering investment, good economic benefits, and simplifying the evaporation process

Inactive Publication Date: 2007-02-21
GUIYANG AL-MG DESIGN & RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The disadvantages of this evaporation process are: high steam consumption, low production capacity of evaporation equipment, low equipment operation rate, large operation and maintenance workload, and it is not recommended to be used in the alumina industry.
[0015] At present, in the evaporation process of alumina plants, the above three evaporation processes and equipment are used at the same time

Method used

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  • Method and equipment for vaporizing full flash distillation of sodium aluminate liquor in technique for producing alumina
  • Method and equipment for vaporizing full flash distillation of sodium aluminate liquor in technique for producing alumina

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Embodiment 1

[0031] Embodiment 1 of the present invention: the evaporated stock solution from the evaporated stock solution tank has a temperature of 75 to 90° C., and is sent into the multi-stage casing preheater 1 with a centrifugal pump 2 (single-stage or cascade pump). The multi-stage casing preheater 1 is composed of 5-9 stages of preheating sections, and uses the secondary steam generated by the multi-stage flash evaporator 4 to preheat the evaporated stock solution, preheating the evaporated stock solution from 75-90°C to 130-170°C , the second section of new steam casing preheater 3 uses new steam to heat the evaporated stock solution, and preheats the evaporated stock solution from 130 to 170°C to 160 to 200°C. The flow rate of the evaporation raw liquid in the multi-stage casing preheater 1 is 1.8-2.8m / s. According to the size of the material flow, the multi-stage casing preheater 1 can be designed in two forms: single casing or multiple casings. In order to ensure the heat trans...

Embodiment 2

[0032] Embodiment two of the present invention: for the gibbsite alumina plant, the evaporation stock solution Na from the evaporation stock solution tank 2 o K 154g / l, temperature 85°C, a single centrifugal pump 2 is used to feed the multi-stage casing preheater 1, the casing preheater is a three-inner tube inner tube specification φ150, each pump corresponds to one inner tube for feeding, multi-stage The casing preheater 1 uses the first stage of secondary steam to preheat the evaporated raw liquid to about 145°C, and then uses new steam to preheat it to 180°C, and then sends it to the 7-stage flash evaporator 4, and flashes step by step to 92°C, sent to the evaporation mother liquor tank. Caustic Na for evaporating mother liquor 2 o K The concentration is 180-185g / l, which just meets the batching requirements of circulating mother liquor.

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Abstract

This invention discloses device and method for completely flash-evaporating sodium aluminum solution during the production of aluminum oxide. The method comprises: (1) introducing the liquid to be evaporated from the raw liquid pool to a multi-stage canula preheater through a centrifuge pump; (2) heating the liquid by secondary steam in the multi-stage canula preheater and new steam in the new-steam preheater; (3) flash-evaporating in a multi-stage flash-evaporator; (4) discharging through a discharge pump to obtain evaporating mother liquid. This invention adopts two-step multi-stage preheating at different temperatures, and controls the temperature difference of multi-stage flash-evaporator cooling to between 10-13 deg.C, thus making full use of secondary steam, largely lower the investment and simplify the process.

Description

Technical field: [0001] The invention relates to an alumina evaporation method and equipment, belonging to the technical field of alumina production. Background technique: [0002] In the production process of Bayer process alumina, the water entering its circulation system mainly includes the following links: [0003] (1) Red mud washing water is added when washing red mud, usually 1.5-4.5t / t-dried red mud in production, and the amount of red mud washing water added when using bauxite to produce alumina is relatively uniform Diaspore is lower. [0004] (2) Aluminum hydroxide washing water, about 0.5~0.75t / t-Al 2 o 3 , [0005] (3) Water is added to other links, such as: vacuum system, pump shaft sealing water, lime digestion and causticizing process, water is added to ore. [0006] Therefore, in the Bayer alumina production process, evaporation is one of its important processes. Its task is to discharge excess water in the process, maintain the water balance in the Bay...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F7/14
Inventor 陈德白英伟
Owner GUIYANG AL-MG DESIGN & RES INST
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