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Method for preparing calcium carbonate with controllable topography by using calcium sulfate

A technology of calcium carbonate and calcium sulfate, which is applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems such as difficult to control the shape, and achieve the effect of uniform shape control, cheap and easy-to-obtain reaction raw materials, and high crystal phase purity

Inactive Publication Date: 2011-03-09
LUDONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of calcium carbonate by carbonization is a method commonly used in large-scale industrial production, but there is a problem that the morphology is difficult to control in this method, so the precipitation method is mainly used for the preparation of calcium carbonate with controllable morphology.

Method used

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  • Method for preparing calcium carbonate with controllable topography by using calcium sulfate
  • Method for preparing calcium carbonate with controllable topography by using calcium sulfate
  • Method for preparing calcium carbonate with controllable topography by using calcium sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Disperse the freshly prepared calcium sulfate precursor in 50 mL of N,N-dimethylformamide with magnetic stirring at 35 °C; 50 mL of 0.06 mol / L NaHCO 3 Quickly pour the solution into the suspension, stir and react at 35°C for 4 hours; centrifuge the precipitate and transfer it to a beaker, add 200ml of distilled water, and stir magnetically at room temperature for 3 hours; centrifuge, wash and dry the separated product, That is, calcium carbonate powder is obtained. figure 1 It is X-ray powder diffraction result, shows that it is single-phase calcium carbonate. From figure 2 It can be seen from the scanning electron microscope photo that it is a mixture of fusiform and flower-shaped.

Embodiment 2

[0025] Disperse the freshly prepared calcium sulfate precursor in 50 mL of N,N-dimethylformamide with magnetic stirring at 35 °C; 50 mL of 0.18 mol / L NaHCO 3 Quickly pour the solution into the suspension, stir and react at 35°C for 4 hours; centrifuge the precipitate and transfer it to a beaker, add 200ml of distilled water, and stir magnetically at room temperature for 3 hours; centrifuge, wash and dry the separated product, That is, calcium carbonate powder is obtained. image 3 It can be clearly seen from the scanning electron microscope photo that it is mainly fusiform calcium carbonate.

Embodiment 3

[0027] Disperse the freshly prepared calcium sulfate precursor in 50 mL of N,N-dimethylformamide with magnetic stirring at 35 °C; 50 mL of 0.06 mol / L NaHCO 3 Quickly pour the solution into the suspension, stir and react at 60°C for 4 hours; centrifuge the precipitate and transfer it to a beaker, add 200ml of distilled water, and stir magnetically at room temperature for 3 hours; centrifuge, wash and dry the separated product, That is, calcium carbonate powder is obtained. Figure 4 It can be clearly seen that it is mainly spherical calcium carbonate from its scanning electron microscope photo.

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Abstract

The invention provides a method for preparing calcium carbonate with controllable topography by taking calcium sulphate as calcium resource, and the topography of calcium carbonate comprises fusiformis, sphere, rod shape and the like. The invention is characterized in that calcium sulphate which is slightly soluble to water is dispersed in N, N-dimethyl formamide or absolute ethyl alcohol to form suspension solution; carbonate solution is added to react for certain time to decentralize and separate products; after the product is dispersed to deionized water to be stirred for certain time, the product is decentralized, washed and dried to obtain single-phase calcium carbonate powder. The topography of the product can be controlled by changing preparation conditions, such as reaction temperature, reaction time, reactant density and dissolved solvent and the like. The method has the characteristics of cheap raw material, simple technology, simple operation, controllable topography and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic salt materials, and relates to a method for preparing calcium carbonate with controllable morphology. Background technique [0002] Calcium carbonate, as an important inorganic non-metallic mineral material, is widely used in industry as a filler in coatings, papermaking, rubber, ink, plastics and other industries, as well as in organic synthesis, metallurgy, glass, ceramics, medicine, food, cosmetics, etc. Manufacture of raw materials, can also be used for industrial wastewater treatment, acid inhibition of gastric and duodenal ulcer disease, antidote for acidosis, containing SO 2 It is a very important inorganic chemical product. [0003] The research on the preparation of calcium carbonate with controllable morphology has attracted the attention of many researchers. Currently, there are two main synthesis methods: carbonization and precipitation. The carbonization method uses limestone calc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 杨丽霞梁英陈厚刘希光杨迎霞
Owner LUDONG UNIVERSITY
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