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Preparation method of low-density hollow calcium carbonate

A calcium carbonate, low-density technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of reduced mechanical properties of calcium carbonate, high density of calcium carbonate, unstable surface structure of calcium carbonate particles, etc., to achieve stable surface structure and production. Low cost, simple and continuous preparation method

Active Publication Date: 2014-09-03
涟源市正铭新型建材有限公司
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Problems solved by technology

[0008] A kind of preparation method of low-density hollow calcium carbonate is proposed for the present preparation method of low-density calcium carbonate that has a large density of calcium carbonate, unstable surface structure of calcium carbonate particles, and reduced mechanical properties of calcium carbonate. In order to achieve the above-mentioned purpose, In the present invention, the calcium source solution is emulsified with an emulsifier, so that the calcium source solution coats the oil core material to form liquid droplets of an oil-in-water structure, and the atomization nozzle is used to atomize the emulsion through carbon dioxide gas for carbonization treatment, and the liquid droplets The calcium source solution in the outer layer is carbonized to form calcium carbonate, and the oil core material in the center is covered to form particles, and finally dried to form calcium carbonate particles with a hollow structure

Method used

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  • Preparation method of low-density hollow calcium carbonate

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Embodiment 1

[0030] 1) The 5.0mol / L calcium chloride solution of 85 parts by weight is joined in the emulsification tank, the pH value of calcium chloride solution is adjusted to 7 with pH adjuster, then add the sodium stearate of 5 parts by weight and 10 parts by weight 100% white oil, emulsified by ultrasonic wave for 120min, the solution is emulsified to form uniform and stable oil-in-water structure droplets, and the size of the oil core of the emulsion droplets can be controlled and adjusted according to the length of emulsification time and the amount of emulsifier used;

[0031]2) Pressurize the emulsion obtained in step 1) with a liquid pump, and then atomize it through a nozzle to form a single small droplet of oil-in-water structure, and carbonize the atomized droplet with carbon dioxide gas, that is, droplet The calcium chloride solution in the outer layer is carbonized to form calcium carbonate, and the white oil in the center is covered to form calcium carbonate particles. The ...

Embodiment 2

[0034] 1) The 1.0mol / L calcium hydroxide solution of 95 parts by weight is joined in the emulsification tank, the pH value of calcium hydroxide solution is adjusted to 8 with pH regulator, then add the sodium lauryl sulfate of 3 parts by weight and 12 parts by weight of n-hexane, using ultrasonic waves for emulsification treatment for 80 minutes, the solution is emulsified to form uniform and stable oil-in-water structure droplets, and the size of the oil core of the emulsion droplets can be controlled and adjusted according to the length of emulsification time and the amount of emulsifier used ;

[0035] 2) Pressurize the emulsion obtained in step 1) with a liquid pump, and then atomize it through a nozzle to form a single small droplet of oil-in-water structure, and carbonize the atomized droplet with carbon dioxide gas, that is, droplet The calcium hydroxide solution in the outer layer is carbonized to form calcium carbonate, and the n-hexane in the center is coated to form...

Embodiment 3

[0038] 1) The 2.0mol / L calcium citrate solution of 90 parts by weight is added in the emulsification tank, the pH value of the calcium citrate solution is adjusted to 9 with a pH regulator, and then the dodecylbenzenesulfonic acid of 4 parts by weight is added Sodium and 10 parts by weight of dodecylbenzenesulfonate are emulsified by ultrasonic waves for 60 minutes to emulsify the solution to form uniform and stable oil-in-water droplets. The size of the oil core of the emulsion droplets can be determined according to the emulsification time. and the amount of emulsifier to control and adjust;

[0039] 2) Pressurize the emulsion obtained in step 1) with a liquid pump, and then atomize it through a nozzle to form a single small droplet of oil-in-water structure, and carbonize the atomized droplet with carbon dioxide gas, that is, droplet The calcium citrate solution in the outer layer is carbonized to form calcium carbonate, and the dodecylbenzenesulfonate in the center is cove...

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Abstract

The invention relates to a preparation method of low-density hollow calcium carbonate. The method comprises the following specific steps: emulsifying a calcium source solution by an emulsifier, wherein the calcium source solution wraps an oil core material to form liquid globules in an oil in water structure; atomizing the emulsion by means of an atomizing nozzle in carbon dioxide gas to be carbonized; carbonizing the calcium source solution outside the liquid globules to form calcium carbonate to wrap the oil core material so as to form particles; finally, drying to form calcium carbonate particles with hollow structures. The hollow calcium carbonate is low in density, stable in structure and good in mechanical property, and the particle diameter and the hollowness can be finely adjusted according to demands, so that the low-density hollow calcium carbonate is convenient and practical and has market application value.

Description

technical field [0001] The invention relates to the field of inorganic non-metallic mineral materials, mainly the field of calcium carbonate materials, in particular to a preparation method of low-density calcium carbonate. Background technique [0002] Calcium carbonate is one of the most important inorganic chemical products, widely used in rubber, plastic, paper, coating, ink, medicine, food and other industries. Calcium carbonate is added as a filler to rubber, plastic, paper and other products, which not only plays the role of filling, increasing and reducing costs, but also improves the processing performance, mechanical strength and thermodynamic properties of the products. But calcium carbonate has a high density (2.6 g / cm 3 -2.7 g / cm 3 ) but the density of products added with calcium carbonate is greatly increased, for example, the density of plastic is only 0.92 g / cm 3 , the density reaches 2.0 g / cm after adding calcium carbonate as filler 3 , thus weakening an...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 陈庆李兴文
Owner 涟源市正铭新型建材有限公司
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