Method for preparing water softening aluminium stone of sodium aluminate solution carbonation resolving

A technology of carbonation decomposition and boehmite, which is applied in the field of industrial production of boehmite and metallurgical grade alumina by carbonation decomposition of sodium aluminate solution, can solve the problems of high raw material cost and complicated process flow, etc. Achieve the effect of large-scale industrialization with broad prospects

Inactive Publication Date: 2007-10-03
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

[0018] The object of the present invention is to provide a method for preparing boehmite by carbonation and decomposition of s...

Method used

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  • Method for preparing water softening aluminium stone of sodium aluminate solution carbonation resolving
  • Method for preparing water softening aluminium stone of sodium aluminate solution carbonation resolving
  • Method for preparing water softening aluminium stone of sodium aluminate solution carbonation resolving

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Embodiment 1

[0038] Prepare sodium aluminate solution with industrial aluminum hydroxide and sodium hydroxide, the chemical composition is Al 2 o 3 100 g / L, the causticization factor is 1.45. Carbon dioxide is introduced into the decomposition process, the gas concentration is 40%, and the decomposition process CO 2 The ventilation rate is 20 liters / liter solution·hour. When gibbsite is used as the seed crystal, the seed crystal coefficient is 1.0, and the decomposition time is 4h. See Figure 2(c)-(d) for the morphology of seed crystals and products. SEM analysis shows that boehmite is mainly composed of agglomerates of rhombohedral grains, while gibbsite is mainly composed of hexagonal grains. This example illustrates that by adding boehmite seed crystals, directional crystallization of boehmite can be achieved through carbonation and decomposition, thereby preparing a boehmite product.

Embodiment 2

[0040] Experimental industrial sodium aluminate solution, the chemical composition is Al 2 o 3 105 g / l with a causticization factor of 1.50. Carbon dioxide is introduced into the decomposition process, the gas concentration is 35%, CO 2 The ventilation rate is adjusted between 20-30 liters / liter solution·hour. Boehmite is used as the seed crystal, the seed crystal coefficient is 0.5, the decomposition time is 4.5h, 200ppm stearic acid is added during the decomposition process, and phase analysis shows that 98% of the product is composed of boehmite.

Embodiment 3

[0042] Prepare sodium aluminate solution with industrial aluminum hydroxide and sodium hydroxide, the chemical composition is Al 2 o 3 100 g / L, the causticization coefficient is 1.45, carbon dioxide is introduced into the decomposition process, the gas concentration is 40%, CO 2 The ventilation rate is adjusted at 20-40 liters / liter solution·hour. Boehmite was used as the seed crystal, the seed crystal coefficient was 1.5, and the decomposition time was 3 hours. During the decomposition process, 150 ppm of a mixture of stearic acid and stearyl alcohol was added. Phase analysis showed that 99% of the product was composed of boehmite.

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Abstract

A process for preparing the boehmite by carbonating decomposition of sodium aluminate solution features that the crystal seeds of boehmite are added, the speed of filling CO2 is controlled for suppressing the educing out of gibbsite, and the crystal growth promoter is used. Its decomposing conditions are also disclosed.

Description

technical field [0001] The invention belongs to the technical field of industrial alumina production, and in particular provides a method for preparing boehmite by carbonation and decomposition of sodium aluminate solution, which is suitable for industrial production of metallurgical grade alumina. technical background [0002] The alumina production in my country is dominated by the sintering method and the combination method, and the energy consumption is 2 to 4 times the average energy consumption of the foreign Bayer method, among which the energy consumption of calcination is high, accounting for about 15% of the total energy consumption of production. Therefore, reducing the energy consumption index of this process is of great significance for the energy saving of the alumina process. [0003] The methods for preparing aluminum hydroxide from sodium aluminate solution are mainly divided into Bayer method seed crystal decomposition (referred to as species) and sintering...

Claims

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Application Information

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IPC IPC(8): C01F7/14
Inventor 王志郭占成
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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