Preparation method of hollow rod-like calcium carbonate

A calcium carbonate, rod-shaped technology, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve the problems of difficult control of hollow particle calcium carbonate reaction conditions, low yield, etc., to achieve The effect of reducing the cost of preparing calcium carbonate, low production cost and stable quality

Inactive Publication Date: 2020-02-28
GUANGXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a method for preparing hollow rod-shaped calcium carbonate to solve the problems that the reaction conditions of hollow granular calcium carbonate prepared by traditional chemical methods are difficult to control and the yield is not high.

Method used

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  • Preparation method of hollow rod-like calcium carbonate
  • Preparation method of hollow rod-like calcium carbonate
  • Preparation method of hollow rod-like calcium carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A preparation method of calcium carbonate, comprising the following steps:

[0035] S1. Accurately weigh calcium oxide and dissolve it in deionized water, heat it to 80°C in a constant temperature water bath, stir for 2 hours, let it stand for digestion for 24 hours, remove the residue after sieving through 200 meshes, adjust the concentration, and obtain a raw material with a concentration of 1%. Calcium hydroxide slurry;

[0036] S2. Get 180ml of the prepared calcium hydroxide slurry and move it into the high-pressure micro-reactor, add 1% D-sodium gluconate according to the concentration molar ratio of the calcium hydroxide slurry, seal the high-pressure micro-reactor, open the heating device and the stirring device, The mixed solution is heated at a temperature of 100°C and a speed of 50V min -1 and access to CO 2 The gas increases the pressure in the reactor by 1.5 MPa to react for 4 hours to obtain the product slurry;

[0037] S3. After the slurry is suction fi...

Embodiment 2

[0039] The process for preparing calcium carbonate is basically the same as in Example 1, except that the reaction temperature in step S2 is 120°C.

Embodiment 3

[0041] The process for preparing calcium carbonate is basically the same as in Example 1, except that the reaction temperature in step S2 is 140°C.

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Abstract

The invention discloses a preparation method of hollow rod-like calcium carbonate. The preparation method comprises the following steps: S1, accurately weighing calcium oxide, dissolving the calcium oxide in water, carrying out heating, stirring and standing digesting, carrying out screening, removing residues, and concentrating the product to obtain raw material calcium hydroxide slurry, S2, transferring the prepared calcium hydroxide slurry into a reaction kettle, adding sodium D-gluconate into the prepared calcium hydroxide slurry according to the concentration molar ratio of the calcium hydroxide slurry, controlling the temperature and the rotating speed of the mixed solution, and introducing CO2 gas for reaction to obtain product slurry, and S3, carrying out suction filtration and washing on the product slurry, separating a solid product, carrying out vacuum drying on the separated solid product, taking out the product and grinding the product into powder to obtain hollow rod-likecalcium carbonate. The method has the advantages of easy control of reaction conditions, high yield, low production cost, novel morphology, narrow particle size range, stable quality, good product dispersibility, simple production equipment, environmental protection, strong operability and the like, is suitable for industrial production, and can be widely popularized and applied.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic non-metallic materials, and in particular relates to a preparation method of hollow rod-shaped calcium carbonate. Background technique [0002] Calcium carbonate is abundant in nature and is an important industrial raw material. At present, people have conducted extensive and in-depth research on calcium carbonate. Calcium carbonate is widely used in papermaking, rubber, paint, building materials, ink, food and other fields because of its low price, non-toxic and harmless, and excellent chemical and physical properties. At the same time, according to the different calcium carbonate particles, it can be divided into irregular type, cubic shape, spherical shape, spindle shape, needle shape, sheet shape and so on. Because calcium carbonate products have different growth methods, different particle sizes and different crystal forms, their use value and price are also quite different...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/183C01P2002/72C01P2002/82C01P2004/03C01P2004/04C01P2004/10C01P2004/61C01P2004/62
Inventor 李立硕史刘宾童张法贺路路刘曦曦汤勇冯亚军刘晨民钟玲萍廖丹葵
Owner GUANGXI UNIV
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