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Production of high-purity spherical nano-calcium carbonate

A calcium carbonate and nanotechnology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of high performance requirements of reaction equipment, uneven particle size distribution, high energy consumption in the reaction process, shorten the reaction time, optimize the production process, save input effect

Active Publication Date: 2007-11-21
仙桃市中星电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention mainly solves the technical problems existing in the production of calcium carbonate in the prior art, such as complex process, high requirements on the performance of reaction equipment, high energy consumption, long time and high cost of the reaction process.
[0005] The present invention also solves the technical problems such as low product purity, large particles and uneven particle size distribution in the production of calcium carbonate in the prior art.

Method used

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  • Production of high-purity spherical nano-calcium carbonate
  • Production of high-purity spherical nano-calcium carbonate
  • Production of high-purity spherical nano-calcium carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1: the dissolving temperature is 90 DEG C, under the condition of continuous stirring, calcium chloride is dissolved in deionized water, and the impurity removal agent of calcium chloride weight 3% is added in the solution simultaneously, and this impurity removal agent is hydroxide A mixture of calcium and polyacrylamide mixed at a ratio of 4:1, then filter out impurities, add water to prepare a 0.4mol / L calcium chloride solution; dissolve sodium hydroxide in deionized water to prepare a 5.0mol / L hydroxide Sodium solution, then lowered to room temperature, under the condition of continuous stirring, let it slowly flow into the calcium chloride solution for reaction, and control the reaction temperature at 30°C to obtain calcium hydroxide slurry; pump the above calcium hydroxide slurry into Into the carbonization reactor, feed pure carbon dioxide for carbonization, and control the reaction temperature not to exceed 30°C, detect the pH value of the reaction sol...

Embodiment 2

[0022] Embodiment 2: the dissolving temperature is 95 ℃, under the condition of continuous stirring, calcium chloride is dissolved in deionized water, and the impurity removal agent of calcium chloride weight 4% is added in the solution simultaneously, and this impurity removal agent is hydroxide A mixture of calcium and polyacrylamide mixed at a ratio of 5:1, then filter out impurities, add water to prepare a 0.2mol / L calcium chloride solution; dissolve sodium hydroxide in deionized water to prepare a 3.5mol / L hydroxide Sodium solution, then lowered to room temperature, under the condition of continuous stirring, let it slowly flow into the calcium chloride solution for reaction, and control the reaction temperature at 25°C to obtain calcium hydroxide slurry; pump the above calcium hydroxide slurry into Into the carbonization reactor, feed pure carbon dioxide for carbonization, and control the reaction temperature to 25°C, and check the pH value of the reaction solution. When ...

Embodiment 3

[0024] Embodiment 3: the dissolving temperature is 100 ℃, under the condition of continuous stirring, calcium chloride is dissolved in deionized water, and the impurity removal agent of calcium chloride weight 5% is added in the solution simultaneously, and this impurity removal agent is hydroxide The mixture of calcium and polyacrylamide mixed in a ratio of 3:1 is prepared by adding water to prepare a 0.3mol / L calcium chloride solution; dissolving sodium hydroxide in deionized water to prepare a 2.5mol / L sodium hydroxide solution, and then To room temperature, under the condition of continuous stirring, let it slowly flow into the calcium chloride solution for reaction, and control the reaction temperature at 20°C to obtain calcium hydroxide slurry; pump the above calcium hydroxide slurry into the carbonization reactor , feed pure carbon dioxide for carbonization, and control the reaction temperature to 20°C, detect the pH value of the reaction solution, and when the pH value ...

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Abstract

Production of high-purity spherical calcium carbonate is carried out by taking calcium chloride as chlorine source, taking mixture of calcium hydroxide and polyacrylamide as impurity remover, reacting it with sodium hydroxide, bubbling while carburizing by pure carbon dioxide, growing calcium carbonate crystal grain fast and enlarging. It has excellent purity, activity and dispersion, it simplifies and optimizes process, shortens reactive time and saves energy resources, it costs low and has no environmental pollution.

Description

technical field [0001] The invention relates to a production method of calcium carbonate, in particular to a preparation method of high-purity nano-spherical calcium carbonate. Background technique [0002] Nano-calcium carbonate refers to ultra-fine powder calcium carbonate with a particle size of 1-100nm. Due to its advantages of high purity, good whiteness, and fine particle size, it can be used as a high-grade filling material and filled in various industrial products. If it is filled into rubber, it can replace part of semi-reinforcing carbon black or white carbon black. On the one hand, it can reduce the cost, and on the other hand, it can also significantly reinforce and accelerate the vulcanization of rubber; while filling it into plastic, it can Improve the hardness, heat resistance and geometric stability of plastic products, and also greatly improve the wear resistance and impact resistance of plastic products. It is precisely because nano-calcium carbonate has th...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 赵中友黄敏杨锋林贡王敏
Owner 仙桃市中星电子材料有限公司
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