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Production method of nano calcium carbonate

A technology of nano-calcium carbonate and production methods, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, carbon compounds, etc., can solve the problems of wide product particle size distribution, long production cycle, etc., achieve shortened production cycle, production The effect of short cycle and reduced investment

Inactive Publication Date: 2017-12-15
广西华洋矿源材料有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to provide a production method of nano-calcium carbonate to solve the problems of wide product particle size distribution and long production cycle in the traditional production process of nano-calcium carbonate

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  • Production method of nano calcium carbonate

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Embodiment Construction

[0033] The specific implementation of the invention will be further described below in conjunction with the accompanying drawings.

[0034] A kind of production method of nanometer calcium carbonate, comprises the following steps:

[0035] (1) calcining: get natural limestone, and carry out high-temperature calcining in calcining kiln, obtain CaO and kiln gas; CO in the kiln gas 2 The gas is separated and liquefied into tanks to obtain C0 2 Output tank 1.

[0036] (2) Digestion: remove impurities from CaO in step (1) and then add water for digestion, the water temperature is 80-100° C. to obtain Ca(OH)2 suspension. In this embodiment, the water temperature is 90°C.

[0037] (3) Sizing: the temperature of the Ca(OH)2 suspension obtained in step (2) is controlled at 18-22° C., the solid content is controlled at 9-13%, and a crystal form control agent is added to obtain a fine slurry. The crystal form control agent is one or more of triethanolamine, tartaric acid, citric acid, ...

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Abstract

The invention discloses a production method of nano calcium carbonate, and belongs to the technical field of calcium carbonate manufacturing. The production method comprises the steps of calcination, digestion, size mixing, carbonization, coating, filtration and drying. In the calcination process, CO2 in kiln gas is separated and is liquefied and canned to obtain a CO2 output tank; the carbonization process comprises first carbonization, screening and second carbonization; the first carbonization is conducted in a first carbonization tank, CO2 is input through the CO2 output tank, compared with traditional kiln gas input, the concentration of CO2 in the first carbonization tank is increased, and the reaction cycle is shortened; through the arrangement of a first circulation pipeline in the first carbonization tank, a fine slurry in a first inner cavity is in sufficient contact with CO2, and the reaction cycle is further shortened; the second carbonization is conducted in a second carbonization tank, and the structure of the second carbonization tank is the same as that of the first carbonization tank. The production method of nano calcium carbonate solves the problem that the product is wide in particle size distribution and long in production cycle in a traditional nano calcium carbonate manufacturing technology.

Description

technical field [0001] The invention belongs to the technical field of calcium carbonate production, and in particular relates to a production method of nanometer calcium carbonate. Background technique [0002] CaCO 3 It is an important inorganic chemical product. Due to its low price, wide range of raw materials, and non-toxicity, it is widely used as a filler in rubber, plastic, paper, paint, toothpaste, etc. Ordinary CaCO 3 Used as a filler only to increase the volume and reduce the price of the finished product, while nano-calcium carbonate can not only increase the volume and reduce the cost, but also has a reinforcing effect when used in plastics, rubber and paper. [0003] The intermittent bubbling carbonization method is widely used in the production of nano-calcium carbonate at home and abroad. It has the advantages of small equipment investment and simple operation. However, because there is no stirring during the carbonization process, the particle size distri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18C04B2/10C01B32/50
CPCC01F11/183C04B2/10
Inventor 李文康张宸宇欧西江
Owner 广西华洋矿源材料有限公司
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