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Aging method for preparing pseudo-boehmite by carbonation method

A technology of pseudo-boehmite and carbonation, which is applied in chemical instruments and methods, preparation of alumina/aluminum hydroxide, alkali metal aluminate/aluminum oxide/aluminum hydroxide, etc., and can solve miscellaneous items and temperature raising of slurry Long process, high energy consumption of the aging process, etc., to achieve the effect of high crystallinity, lower production cost, and less impurities

Active Publication Date: 2017-07-28
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing aging process consumes a lot of energy, the process of raising the temperature of the slurry is long, and easily causes miscellaneous items. It provides an aging method for preparing pseudo-boehmite by carbonation

Method used

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  • Aging method for preparing pseudo-boehmite by carbonation method

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Effect test

Embodiment 1

[0014] A carbonation method for preparing pseudo-boehmite aging method provided in Example 1 of the present invention is specifically as follows: using sodium aluminate refined solution produced by soda lime sintering method as raw material, adjusting its alumina content to 42g / l, The caustic ratio is 1.52, and industrial carbon dioxide gas with a volume concentration of 30-40% is introduced. After 15 minutes, the pH value of the slurry is 13, and the obtained slurry is rapidly separated from liquid to solid. Put the separated filter cake into a sealed plastic bag, put it in water at 70°C for 2 hours, add hot water at 80°C to melt the slurry, stir repeatedly, wash and remove impurities, and finally dry it in an oven to obtain a qualified product. Please refer to Attached Table 1 for product indicators.

Embodiment 2

[0016] A carbonation method for preparing pseudo-boehmite aging method provided in Example 2 of the present invention is specifically as follows: using sodium aluminate refined solution produced by soda lime sintering method as raw material, adjust its alumina content to 23g / l, The caustic ratio is 1.37, and industrial carbon dioxide gas with a volume concentration of 30-40% is introduced. After 10.5 minutes, the pH value of the slurry is 10.5, and the obtained slurry is rapidly separated from liquid to solid. Put the separated filter cake into a sealed plastic bag, put it in water at 90°C for 4 hours, add hot water at 75°C to melt the slurry, stir repeatedly, wash and remove impurities, and dry in an oven to obtain a qualified product. Please refer to Attached Table 1 for product indicators.

Embodiment 3

[0018] A carbonation method for preparing pseudo-boehmite aging method provided in Example 3 of the present invention is specifically as follows: using sodium aluminate refined solution produced by soda lime sintering method as raw material, adjusting its alumina content to 36g / l, The caustic ratio is 1.42, and industrial carbon dioxide gas with a volume concentration of 30-40% is introduced. After 13 minutes, the pH value of the slurry is 11, and the obtained slurry is rapidly separated from liquid to solid. Put the separated filter cake into a sealed flask, put it in water at 95°C and keep it warm for 3.5 hours, then add hot water at 95°C to melt the slurry, perform repeated stirring, washing and impurity removal, and dry in an oven to obtain a qualified product. Please refer to Attached Table 1 for product indicators.

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Abstract

The invention discloses an aging method of pseudo-boehmite prepared by a carbonation method. The method concretely comprises the steps of enabling the pseudo-boehmite prepared by the carbonation method to form gel, and then rapidly carrying out on solid-liquid separation; after that, putting a filter cake attached with mother liquor into a closed container, heating and aging. The aging method is simple in technology, low in energy consumption, high in productivity and low in production cost; the prepared pseudo-boehmite product is pure in crystalline phase, high in degree of crystallinity, good in gel dissolubility, less in impurity and wide in use.

Description

technical field [0001] The invention relates to a preparation method of pseudo-boehmite, in particular to an aging method for preparing pseudo-boehmite by a carbonation method. Background technique [0002] Pseudo-boehmite can be prepared in a variety of ways. Most of the domestic sintered alumina factories use carbonation to prepare pseudo-boehmite. Because it is grafted on the alumina production process, the source of raw materials is convenient, and the by-products in the process, The waste liquid can be returned to the alumina process to realize a closed loop, so the product cost is low and there is no environmental pollution. The technical process of preparing pseudo-boehmite by carbonation method includes batching, gelling, aging, washing, liquid-solid separation, drying and other steps in sequence. [0003] There are many domestic and foreign patents and related reports on the aging technology in the process of preparing pseudo-boehmite by carbonation, but they are a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02C01F7/14
CPCC01F7/02C01F7/142C01P2006/14C01P2006/80C01P2006/90
Inventor 孟令利张丽李广战秦烟莱
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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