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Preparation method of granularity-controllable CaCO3

A calcium carbonate and particle size technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of uneven particle size distribution and difficulty in reflecting the use effect, and achieve the effects of enhancing heat transfer, saving power, and simplifying devices

Inactive Publication Date: 2013-02-06
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the particle size distribution obtained by it is uneven, and it is difficult to reflect the stable use effect in the process of ink use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for preparing calcium carbonate with controllable particle size, the steps are as follows:

[0030] Weigh 111gCaCl 2 with 106gNa 2 CO 3 Respectively dubbed into 500ml aqueous solution; and in Na 2 CO 3 Add 0.002molH to the aqueous solution 2 SO 4 ;

[0031] Mix the reactants by pouring the feeding method, the feeding time is within 2s, and then make the CaCl 2 Aqueous solution and Na 2 CO 3 The aqueous solution was mixed and reacted, and the reaction temperature was controlled at 20°C for 30 minutes to obtain the reaction solution;

[0032] Filter the reaction solution obtained above, and dry and grind the obtained filter cake to obtain 100 g of CaCO 3 , the particles are spherical, well dispersed, uniform in size, and the particle size is 2 μm.

Embodiment 2

[0034] A method for preparing calcium carbonate with controllable particle size, the steps are as follows:

[0035] Weigh 111gCaCl 2 with 106gNa 2 CO 3 Respectively dubbed into 500ml aqueous solution; and in Na 2 CO 3 Add 0.002molH to the aqueous solution 2 SO 4 ;

[0036] Mix the reactants by pouring the feeding method, the feeding time is within 2s, and then make the CaCl 2 Aqueous solution and Na 2 CO 3 The aqueous solution was mixed and reacted, and the reaction temperature was controlled at 20°C for 10 minutes to obtain the reaction solution;

[0037] Filter the reaction solution obtained above, and dry and grind the obtained filter cake to obtain 100 g of CaCO 3 , the particles are spherical, well dispersed, uniform in size, and the particle size is 1 μm.

Embodiment 3

[0039] A method for preparing calcium carbonate with controllable particle size, the steps are as follows:

[0040] Weigh 111gCaCl 2 with 106gNa 2 CO 3 Respectively dubbed into 500ml aqueous solution; and in Na2 CO 3 Add 0.002molH to the aqueous solution 2 SO 4 ;

[0041] Mix the reactants by pouring the feeding method, the feeding time is within 2s, and then make the CaCl 2 Aqueous solution and Na 2 CO 3 The aqueous solution was mixed and reacted, and the reaction temperature was controlled at 20°C for 5 minutes to obtain the reaction solution;

[0042] Filter the reaction solution obtained above, and dry and grind the obtained filter cake to obtain 100 g of CaCO 3 , the particles are spherical, well dispersed, uniform in size, and the particle size is 0.8 μm.

[0043] Through the comparison of the above-mentioned embodiment 1, embodiment 2 and embodiment 3, it can be seen that the use of H 2 SO 4 As a crystallization control agent, control different pouring react...

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Abstract

The invention discloses a preparation method of granularity-controllable CaCO3, comprising the following steps of: firstly, respectively preparing a CaCl2 aqueous solution and a soluble carbonate aqueous solution; then, pouring and mixing the CaCl2 aqueous solution and the soluble carbonate aqueous solution to react for producing CaCO3; and finally, filtering a reaction liquid, drying and grinding a filter cake to obtain the granularity-controllable CaCO3, wherein a chloride mother liquid is recycled, and a metal ion or acid radical ion is used as a crystal control-additive to be added into a corresponding raw material aqueous solution to control the shape of a grain of the CaCO3 in the preparation process. By using the preparation method of the granularity-controllable CaCO3, provided by the invention, the obtained chloride mother liquid can be recycled for dissolving the raw materials CaCl2 and soluble carbonate, and therefore, the preparation method is a clean production process with the advantages of zero emission and no environment pollution.

Description

technical field [0001] The present invention relates to a kind of carbonate of calcium, more specifically relates to a kind of preparation method of calcium carbonate with controllable particle size. Background technique [0002] Calcium carbonate is widely used in plastics, papermaking, coatings, inks, daily chemicals and other industries. For different application systems, the required morphology of calcium carbonate particles is also different. For example, for inkjet printers, the use of calcium carbonate fillers with spherical particles and cubic particles is conducive to clear patterns and uniform inkjet; for coated paper, the use of flake particles can improve coating efficiency and reduce the amount of coating agent. In the application process of calcium carbonate, it is not that the smaller the particles, the better the effect. Blindly pursuing nanoparticles cannot obtain the ideal use effect. [0003] At present, most calcium carbonate production processes use CO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 郁平
Owner SHANGHAI INST OF TECH
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