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Carbonate-removing method in alumina production

A carbonate and alumina technology, applied in chemical instruments and methods, aluminate/alumina/aluminum hydroxide purification, inorganic chemistry, etc., can solve the problem of high liquid content of carbonate filter cake, sedimentation and filtration Poor performance, difficult process operation and other problems, to improve the effect of salt discharge and reduce the effect of liquid content

Inactive Publication Date: 2009-01-14
GUIYANG AL-MG DESIGN & RES INST
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  • Abstract
  • Description
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Problems solved by technology

The first three salt removal methods have disadvantages such as poor salt removal effect, large loss of alumina, high cost of salt removal, and environmental pollution, so they should not be used; the latter two methods are generally used now, although the latter two salt removal methods are basically Overcome the disadvantages of the first three, but the discharged salt is aqueous sodium carbonate (Na 2 CO 3 ·nH 2 O), this not only causes difficulties in the operation of the follow-up process and makes the carbonate filter cake have a high liquid content, but also has part of the separated salt to return to the circulating sodium aluminate solution, thereby reducing the effect of salt discharge

Method used

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Embodiment Construction

[0011] Embodiment of the present invention: set up a salt seed pump (4) on one side of the existing salt settling tank (2) in production and set up a lye pump (5) on one side of the high-concentration caustic alkali tank (3) ), using the above two pumps to send crystal seeds and high-concentration caustic alkali into the flash tank (1), or into the crystallization chamber (6) or the heating chamber (7) of the forced circulation evaporator through pipelines, to make the crystallization Most of the salt is anhydrous sodium carbonate with good sedimentation and filtration performance; in the process of forced circulation and flash evaporation, the caustic Na in the solution 2 o k When the concentration does not meet the requirement of salt discharge, add an appropriate amount of high-concentration caustic to make the caustic (Na 2 o k ) concentration reaches more than 320g / l, so that the salt equilibrium concentration in the solution after the salt discharge is reduced to below...

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Abstract

This invention discloses a method for removing carbonates during the aluminum oxide production and the apparatus thereof, which comprises: salt-removal equipment(forced-circulation evaporator or flash evaporation tank), salt settling tank, high concentration caustic alkali tank, salt seed crystal pump, lye pump and corresponding pipes. During the forced-circulation and flash evaporation salt-removing process, add appropriate amount of carbonate seed crystal and high concentration caustic alkali, so as to improve the salt-removing efficiency and obtain mostly anhydrous sodium carbonate with good settling and filtering properties in the removed salt.

Description

Technical field: [0001] The present invention relates to a kind of carbonate (Na 2 CO 3 ) and belongs to the technical field of salt discharge in alumina production. technical background: [0002] During the production of alumina by the Bayer process using diaspore or boehmite as raw materials, carbonates are continuously accumulated in the circulating sodium aluminate solution, resulting in a decrease in the cycle efficiency of alumina production and a decrease in output , when accumulated to a certain extent, it will be precipitated on the heat exchange surface of equipment such as dissolution, semen heat exchange, evaporation, etc., which will reduce the heat transfer efficiency (increase energy consumption), and more seriously, it will be precipitated in pipelines, etc. Valves cause blockage of pipelines and valves and force production to be interrupted, so it is necessary to try to drain the salt. [0003] Existing salt removal technologies include: aging salt remova...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/46C01F7/20
Inventor 高振文白英伟方钟毓
Owner GUIYANG AL-MG DESIGN & RES INST
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