Method for preparing 4A zeolite by continuous crystallization

A technology of crystallization and zeolite, applied in the fields of washing and chemical industry, can solve problems such as difficult cleaning of pipeline scars, single temperature of crystallization temperature, long residence time of materials, etc., to reduce manual control points, stabilize product quality, and reduce labor intensity Effect

Active Publication Date: 2010-02-24
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many control points, which can easily cause fluctuations in product quality and affect the use of users
CN 1453213A discloses a process for preparing 4A zeolite and its special equipment. A continuous crystallization process is mentioned. The crystallizer used is a pipelined equipment, and the crystallization temperature is a single temperature, and it is used as a pipelined production There are many unsolvable problems in itself: such as the difficulty of cleaning pipe scars, long residence time of materials, etc.

Method used

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  • Method for preparing 4A zeolite by continuous crystallization

Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] Slurry process: Al 2 o 3 Sodium metaaluminate solution with a concentration of 40g / l and SiO 2 The water glass solution with a meter concentration of 8% is simultaneously added to the stirring reaction tank c according to the silicon-aluminum molar ratio of 1, so that the sodium metaaluminate solution and the water glass are fully mixed and homogenized, and the reaction temperature is controlled at 30 ° C. pulp;

[0023] Pre-crystallization process: The slurry in the above steps is continuously pumped into the first pre-crystallization tank a1 in series with a delivery pump body, and 4A zeolite directing agent is added, wherein the volume ratio of 4A zeolite directing agent to slurry is 3‰. The pump body continuously sends the above slurry into the second pre-crystallization tank a2, the third pre-crystallization tank a3, and the eighth pre-crystallization tank a8 (n is 8); the slurry is pre-crystallized in the pre-crystallization tank And trigger the crystal nucleus...

Embodiment 2

[0027] Slurry process: Al 2 o 3 Sodium metaaluminate solution with a concentration of 80g / l and SiO 2 The water glass solution with a meter concentration of 13% is simultaneously added into the stirring reaction tank c according to the silicon-aluminum molar ratio of 1.5, so that the sodium metaaluminate solution and the water glass are fully mixed and homogenized, and the reaction temperature is controlled at 50 ° C. pulp;

[0028] Pre-crystallization process: Continuously pump the slurry in the above steps into the first pre-crystallization tank a1 in series with a delivery pump body, add 4A zeolite guiding agent, wherein the volume ratio of 4A zeolite guiding agent to slurry is 4‰, and use the delivery pump The pump body continuously sends the above slurry into the second pre-crystallization tank a2, the third pre-crystallization tank a3, and the fourth pre-crystallization tank a4 (n is 4); the slurry is pre-crystallized in the pre-crystallization tank And trigger the cr...

Embodiment 3

[0032] Slurry process: Al 2 o 3 Sodium metaaluminate solution with a concentration of 100g / l and SiO 2 The water glass solution with a meter concentration of 19% is simultaneously added into the stirring reaction tank c according to the silicon-aluminum molar ratio of 2, so that the sodium metaaluminate solution and the water glass are fully mixed and homogenized, and the reaction temperature is controlled at 70 ° C to obtain the pulp;

[0033] Pre-crystallization process: Continuously pump the slurry in the above steps into the first pre-crystallization tank a1 in series with the delivery pump body, add 4A zeolite directing agent, wherein the volume ratio of 4A zeolite directing agent to slurry is 6‰, and use the conveying pump The pump body continuously sends the above slurry into the second precrystallization tank a2 (n is 2); the slurry is precrystallized in the precrystallization tank and induces crystal nuclei to make the 4A crystal grow initially, and controls all precr...

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Abstract

The invention discloses a method for preparing 4A zeolite by continuous crystallization. A sodium metaaluminate solution and sodium silicate are used as raw materials to prepare the 4A zeolite, groovetype devices connected in series are divided into two groups to carry out continuous crystallization at two temperatures, and the continuous crystallization is divided into two processes of precrystallization and growing crystallization; a guiding agent is added in the phase of the precrystallization at lower temperature to induce a crystal nucleus so that a crystal initially grows; the temperature rises in the phase of the growing crystallization, the 4A crystal fully grows till the crystallization is perfect, and the process of continuous crystallization is finally finished. The method caneffectively lower a manual control point to carry out centralized control, reduce the labor intensity and improve the production efficiency; and because the temperature gradually rises, thereby effectively inhibiting a mixed crystal and ensuring stable quality of products.

Description

technical field [0001] The invention belongs to the technical fields of chemical industry and washing, and in particular relates to a method for preparing 4A zeolite by continuous crystallization. Background technique [0002] At present, sodium metaaluminate solution is generally used in China as the raw material for producing 4A zeolite, which is used as an aluminum source and water glass as a silicon source for synthetic reaction to produce 4A zeolite. The production of 4A zeolite is mostly single-tank batch production, which only meets the requirements of continuous production in the pulping, separation, washing and drying processes, while the main synthesis stage and crystallization stage are still single-tank batch production. Each tank needs to strictly control the conditions to meet the requirements of the process, so as to ensure that the product indicators are qualified and up to standard. There are many control points, which will easily cause fluctuations in prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/16
Inventor 李广战孟令利周峰孟春玲韩皓
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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