One-step carbonization process of preparing cubic calcium carbonate of 80-100 nm size

A cube and calcium carbonate technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of large calcium carbonate crystal particle size, uneven particle size distribution, complex production process, etc., and achieve narrow particle size distribution and crack resistance Good, glossy finish

Inactive Publication Date: 2002-07-31
GUANGZHOU GBS HIGH TECH & IND
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  • Summary
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  • Description
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  • Application Information

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Problems solved by technology

[0007] The preparation methods of calcium carbonate introduced in the above-mentioned patents all have the characteristics of large particle size, uneven particle size distribution, unstable particles, complex production process and high production cost of the prepared calcium carbonate crystals.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Be 11% at concentration, be that the calcium hydroxide slurry of 22 ℃ adds the composite additive of 0.5% in temperature, composite crystal form control agent is a kind of by 15% (weight) methyl polyoxysilane, 3% (weight) polyethylene A kind of emulsion that alcohol, 2% (weight) Tween-80, 80% (weight) water emulsification forms, fully stirs, then this slurry is introduced into a volume and is in the bubbling carbonization tower of 60 liters, with about 60 The speed of liter / min·kg of calcium hydroxide is passed into carbon dioxide gas with a volume content of 30% for carbonization. During the carbonization process, the temperature is controlled by passing cold water. After 53 minutes, the pH value of the slurry drops to 7.3, stop carbonization, and take part of the slurry for filtration , dried, ground, and observed under a transmission electron microscope, the calcium carbonate particles are well dispersed, the shape is a cube, the average particle size is 85nm, and the...

Embodiment 2

[0016] Be 11% at concentration, be that the calcium hydroxide slurry of 22 ℃ adds the composite additive of 1% in temperature, composite crystal form control agent is a kind of by 12% (weight) methyl polyoxysilane, 5% (weight) polyethylene A kind of emulsion that alcohol, 3% (weight) Tween-80, 80% (weight) water emulsification forms, fully stirs, and then this slurry is introduced into a volume and is in the bubbling carbonization tower of 60 liters, with about 60 The speed of liter / minute calcium hydroxide is passed into carbon dioxide gas with a volume content of 25% for carbonization. During the carbonization process, pass cold water to control the temperature. After 50 minutes, the pH value of the slurry drops to 7.5, stop carbonization, and take part of the slurry for filtration. Drying, grinding, observation under a transmission electron microscope, the calcium carbonate particles are in an agglomerated state, the shape is a chain body, the particle diameter is 500nm, and...

Embodiment 3

[0018] Be 11% at concentration, be that the calcium hydroxide slurry of 22 ℃ adds the composite additive of 0.1% in the temperature, the composite crystal shape control agent is a kind of by 12% (weight) methyl polyoxysilane, 3% (weight) polyethylene Alcohol, 3% (weight) Tween-80, 82% (weight) water emulsify a kind of emulsion that forms, fully stir, then introduce this slurry into a volume and be in the bubbling carbonization tower of 60 liters, with about 60 The speed of liter / min·kg of calcium hydroxide is passed into carbon dioxide gas with a volume content of 28% for carbonization. During the carbonization process, the temperature is controlled by passing cold water. After 65 minutes, the pH value of the slurry drops to 7.8, stop carbonization, and take part of the slurry for filtration , dried, ground, and observed under a transmission electron microscope, the calcium carbonate particles are not well dispersed, and the shape is a blend of cubes, spindles, and spheres. The...

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Abstract

Into calcium hydroxide emulsion of 10-12 wt% concentration and at 20-25 deg.c, compound crystal form controlling agent is added while stirring, and then the mixture is transferred into a bubbling carbonating tower for carbonization for 50-70 min while introducing CO2 gas in the rate of 50-80 1/min. Kg calcium hydroxide and cold water to control the temperature not higher than 60 deg.c until the pH value being reduced to 7-8. Through the one-step carbonization process, cubic calcium carbonate of 80-100 nm size is prepared. The said process is suitable for use in industrial production and has low production cost and high production efficiency, and the product has excellent dispersant characteristic and may be widely used, especially in producing silicon rubber product.

Description

technical field [0001] The invention relates to a preparation method of nanometer calcium carbonate. Background technique [0002] At present, the commonly used methods for preparing nano-calcium carbonate include intermittent bubbling method and continuous spraying method, and recently, the supergravity method has appeared. The bubbling method is easy to operate and low in cost, but the carbonization process is difficult to control, and the final product often has a variety of morphology coexistence and a wide particle size distribution; although the continuous spray method is conducive to optimizing the carbonization process, it takes a long time for carbonization and low production efficiency , high energy consumption, and the nozzle is easily blocked, which affects normal production; the supergravity method, under the action of the supergravity field, strengthens the micro-mixing and micro-mass transfer process of the carbonization process, shortens the carbonization tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 王光国王跃林
Owner GUANGZHOU GBS HIGH TECH & IND
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