Method and device for evaporating melted alumina

An evaporation device and alumina technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of increased salt discharge capacity, steaming water capacity and salt discharge capacity that cannot meet the normal operation of production, so as to ensure normal operation and save engineering Investment, reduce the effect of heating area

An evaporation device and alumina technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of increased salt discharge capacity, steaming water capacity and salt discharge capacity that cannot meet the normal operation of production, so as to ensure normal operation and save engineering Investment, reduce the effect of heating area

CN101671041BInactive Publication Date: 2011-07-27中铝国际技术发展有限公司
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  • Method and device for evaporating melted alumina
  • Method and device for evaporating melted alumina

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Embodiment Construction

[0013] The present invention will be further described in detail below in conjunction with the examples, but it is not intended to limit the present invention.

[0014] embodiments of the present invention. An evaporation method after alumina is melted out, as shown in the figure. figure 1 Medium and thick solid arrows indicate the conveying direction of raw materials, hollow arrows indicate the flow direction of steam, thin solid arrows indicate the flow direction of condensate water, and thin dashed arrows indicate the flow direction of circulating water. The method adopts the evaporation process of a combination of six-effect countercurrent plate falling film evaporator plus four-stage flash evaporator and forced circulation salt discharge; the evaporation raw liquid is fed from the 5th effect evaporator and the 6th effect evaporator respectively, and evaporated from the 1st effect. The discharge of the evaporator, the alkali concentration Nk value of the discharge port is...

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Abstract

The invention discloses method and device for evaporating melted alumina. The method adopts an evaporation process which integrates six-effect countercurrent plate type falling film evaporators, four-level flash evaporators and a forceful circulating salt discharging combination; an evaporation stock solution is respectively fed from a fifth-effect evaporator and a sixth-effect evaporator and discharged from a first-effect evaporator; the Nk value of the alkalinity of a discharging hole is 130-140g / L; the discharged stock solution from the first-effect evaporator enters a first-level flash evaporator again; and a circulating mother solution is output from a fourth-level flash evaporator and the forceful circulating salt discharging combination outputs the mixed slurry of the circulating mother solution and salt. Compared with the prior art, the invention effectively reduces the heating areas of evaporator groups, saves the engineering investment when salt discharging amount is increased and ensures the normal operation of the production when water evaporation amount is reduced but the salt discharging amount is increased.

Description

technical field [0001] The invention relates to an evaporation method and device, in particular to an evaporation method and device after alumina is melted out. Background technique [0002] In the alumina production process, it is necessary to use an evaporator to evaporate the evaporated stock solution to obtain a qualified circulating mother liquor. At present, for the alumina production process of diaspore-type bauxite, there are generally two options for the dissolution process: one is the dissolution process of pipelined and autoclave, with a large amount of distilled water; the other is Pipeline strengthens the dissolution process, and the amount of distilled water is small. After adopting the pipeline enhanced dissolution process, the amount of distilled water is reduced, but at the same time, with the depletion of the ore, in order to ensure the dissolution and settling performance, the amount of lime added during ore blending (calculated as effective Ca) is requir...

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Application Information

Patent Timeline
27 Jul 2011
Publication
CN101671041B
IPC
C01F7/02
Inventors
周正明