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Method for efficiently preparing micron-sized regular hexagonal calcium carbonate

A regular hexagonal, micron-scale technology, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve the problems of high energy consumption and difficult industrial application, and achieve simple preparation methods , the effect of high yield

Active Publication Date: 2018-09-11
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Kojima et al. used the method of heating and evaporating saturated calcium carbonate solution to obtain various forms of flaky calcium carbonate. The process consumes a lot of energy, so it is difficult for industrial application
In conclusion, there are no reports of large-scale, uniform regular hexagonal calcium carbonate flakes

Method used

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  • Method for efficiently preparing micron-sized regular hexagonal calcium carbonate
  • Method for efficiently preparing micron-sized regular hexagonal calcium carbonate
  • Method for efficiently preparing micron-sized regular hexagonal calcium carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Add 5.40g of ammonium chloride into a 250mL beaker, and add 20mL of deionized water. After stirring evenly with a magnet, add 35mL of concentrated ammonia solution, stir well, pour it into a 100mL volumetric flask, and add deionized water to it to dilute to 100mL , to get NH at pH=10 3 ·H 2 O-NH 4 Cl buffer solution. Will get NH 3 ·H 2 O-NH 4 Pour the Cl buffer solution into a 250mL beaker, add 5.55g of calcium chloride solid with a purity of more than 99%, and stir evenly with a magnet, then add 0.1665g of zinc chloride solid, and the concentration of calcium ions in the resulting solution is 0.5mol / L. Then pour the obtained solution into a 250mL flat-bottomed flask, put it into an electric thermostatic water bath, heat it to 65°C, and at the same time, use a catheter to continuously feed CO into the calcium ion solution under sealed conditions. 2 Gas, reacted for 2 hours, centrifuged and washed repeatedly with deionized water to obtain micron-sized regular hexag...

Embodiment 2

[0018] In the present embodiment, add 0.0555g zinc chloride solid, other steps are identical with embodiment 1, obtain micron-order regular hexagonal calcium carbonate (see Figure 4 ), whose side length is 4.8-9.7 μm.

Embodiment 3

[0020] In the present embodiment, the reaction time is shortened to 1 hour, and other steps are identical with embodiment 1, obtain micron-order regular hexagonal calcium carbonate (see Figure 5 ), whose side length is 5.2-7.6 μm.

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Abstract

The invention discloses a method for efficiently preparing micron-sized regular hexagonal calcium carbonate. According to the method, based on an aqueous solution of calcium chloride, a NH3 H2O-NH4Clsolution is used as a buffer solution and a precipitating agent, soluble zinc salt is a crystal form controlling agent, CO2 gas is introduced, and the regular hexagonal calcium carbonate with a regular shape and a side length of 4.5-10 microns is prepared. The method has the advantages of simple preparation and high yield, and the obtained micro-sized regular hexagonal calcium carbonate belongs tolight calcium carbonate, can be used as a filler in industries such as rubber, plastic, papermaking, coating, ink and the like, can be used for production of organic synthesis, metallurgy, glass, asbestos and the like, and can also be used as a raw material for tooth powder, toothpaste and other cosmetics.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and in particular relates to a method for absorbing CO by using an inorganic calcium source under a buffer solution system with stable pH. 2 , A method for preparing a large amount of micron-sized regular hexagonal calcium carbonate. Background technique [0002] Calcium carbonate, which is widely used in the fields of rubber, plastics, papermaking, coatings, and medical products due to its low price and high quality, is an important mineral, and it is also the most widely used inorganic filler in organic matrix materials in industrial production. At present, the prepared calcium carbonate has cubic, spindle, chain and hollow spherical shapes, etc. Calcium carbonate products of different shapes have different uses. Compared with other forms of calcium carbonate, the application of flaky calcium carbonate in the paper industry is particularly significant. For example, adding flaky ca...

Claims

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Application Information

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IPC IPC(8): C01F11/18
CPCC01F11/182C01P2002/72C01P2004/03C01P2004/22C01P2004/61
Inventor 金普军张瑜瑾陈煜柯曾波孙存冲张悦
Owner SHAANXI NORMAL UNIV