Method for continuous synthesis of 4A zeolite for detergent auxiliary

A technology of washing auxiliaries and synthesis methods, applied in the direction of inorganic/element washing compositions, etc., can solve the problems of low utilization rate of equipment, unstable synthesis system, complicated technological process, etc., and achieves reduction of equipment and stable reaction system, reducing Manual control points, the effect of improving product quality

Active Publication Date: 2006-04-12
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above three methods for synthesizing 4A zeolite for detergent builders are all discontinuous synthesis processes, which have complex process flow, many manual control points, high labor intensity, low utilization rate of equipment and insufficient synthesis system due to discontinuous synthesis. Instability and other disadvantages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The semi-finished sodium aluminate solution of sintering alumina production process is desiliconized and refined, and then mixed with 4A mother liquor to Al 2 o 3 : 42.5g / L, diluted water glass: SiO 2 : 10.2%, the two solutions press n sio2 / h Al2o3 =2 ratio, volume flow ratio is sodium aluminate preparation solution: dilute water glass=2.28, such as sodium aluminate preparation solution flow rate 150m 3 / h, dilute water glass 65.8m 3 The flow rate per hour is continuously added to the reaction tank through the delivery pump body to form a gel. The process is mechanically stirred, and the colloid stays in the reaction tank for 8 minutes. The directing agent is rapidly heated to 95°C, and after 1.5 hours of heat preservation, the material is separated from solid and liquid by a belt filter or a plate and frame filter press, and the solid is washed and dried to obtain 4A zeolite for detergent aids.

Embodiment 2

[0017] The semi-finished sodium aluminate solution of sintering alumina production process is desiliconized and refined, and then mixed with 4A mother liquor to Al 2 o 3 : 57.45g / L, diluted water glass: SiO 2 : 12.38%, the two solutions press n sio2 / n Al2o3 =1.8 ratio, the volume flow ratio is sodium aluminate preparation liquid: dilute water glass=2.44, such as sodium aluminate preparation liquid flow rate 150m 3 / h, dilute water glass 61.5m 3 The flow rate of / h is continuously added to the reaction tank through the delivery pump body to form a gel, and the process is mechanically stirred, the colloid stays in the reaction tank for 10 minutes, and the above colloid is continuously added to the crystallization tank (enough) by the delivery pump. Add amorphous directing agent, heat up to 95°C through rapid heating, and keep warm for 2 hours. The material is separated from solid and liquid by belt filter or plate and frame filter press, and the solid is washed and dried to...

Embodiment 3

[0019] The semi-finished sodium aluminate solution of sintering alumina production process is desiliconized and refined, and then mixed with 4A mother liquor to Al 2 o 3 : 68.75g / L, diluted water glass: SiO 2 : 15.11%, the two solutions press n sio2 / n Al2o3 =2.1 ratio, the volume flow ratio is sodium aluminate preparation solution: dilute water glass=2.24, such as sodium aluminate preparation solution flow rate 150m 3 / h, dilute water glass 66.9m 3 The flow rate of / h is continuously added to the reaction tank through the delivery pump body to form a gel. The process is mechanically stirred, and the colloid stays in the reaction tank for 9 minutes. The directing agent is rapidly heated to 95°C, and after 3 hours of heat preservation, the material is separated from solid and liquid by a belt filter or plate and frame filter press, and the solid is washed and dried to obtain 4A zeolite for detergent aids.

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Abstract

The invention discloses a method for continuous synthesis of 4A zeolite for detergent auxiliary which consists of, mixing two solutions of SiO2 and Al2O3 by the proportion of nsio2] / nAl2o3=1.7-2.1, charging into reaction tank synchronously, mechanically stirring into gel, agitating the colloid homogeneously, loading into 4A zeolite crystallization tank through conveying pump, charging amorphous guiding agent, elevating the temperature to 95 deg. C, thermal insulating 1.5-3.5 hours, carrying out core forming, crystallization, and continuous solid-liquid separation, washing and drying.

Description

technical field [0001] The invention relates to a continuous synthesis method of 4A zeolite for washing aids, relating to a continuous synthesis method of 4A zeolite for washing aids prepared by using semi-finished sodium aluminate solution in a sintering alumina production process as an aluminum source. Background technique [0002] Use the semi-finished sodium aluminate solution in the sintering alumina production process as the aluminum source to prepare 4A zeolite for detergent builders. Usually, the sodium aluminate solution is desiliconized and then mixed with the 4A zeolite crystallization mother liquor to Al 2 o 3 Dilute sodium aluminate solution with a concentration of 40-70g / L; due to the difference in fluidity between dilute sodium aluminate solution and dilute water glass, a certain amount of dilute sodium aluminate solution is first added to the reaction tank, and then by SiO 2 、Al 2 o 3 Add SiO to the reaction tank with a molar ratio of 1.7-2.2 2 Dilute wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11D3/12
Inventor 霍登伟朱德学冯晓明沈斌王智锦焦念生赵言培赵善雷刘延东刘国艳
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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