A kind of preparation method of calcium carbonate particle

A technology of calcium carbonate and particles, applied in the direction of calcium carbonate/strontium/barium, etc., to achieve the effects of broad application prospects, low price, and simple and easy-to-operate preparation methods

Inactive Publication Date: 2011-12-14
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

GO is a new type of two-dimensional carbon nanostructure. There are relatively abundant oxygen-containing groups such as hydroxyl and carboxyl groups o...

Method used

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  • A kind of preparation method of calcium carbonate particle
  • A kind of preparation method of calcium carbonate particle
  • A kind of preparation method of calcium carbonate particle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] All glass instruments used in the experiment were pretreated as follows: firstly, they were sonicated in ethanol for 30 minutes, and then they were taken out and rinsed with deionized water. Soak in a mixed solvent of concentrated nitric acid / hydrogen peroxide / water at a volume ratio of 1:1:1 for 2 days, take it out, wash it with acetone, and dry it at room temperature. Prepare 100 ml of 0.0025 g / L GO aqueous solution, then add a certain amount of calcium chloride to prepare a 0.01 mol / L calcium chloride solution, and adjust the pH of the solution to 7.5. Cover the beaker containing the solution with a polyethylene film, and make 12 pinholes on the film. Take 20 grams of ammonium carbonate, grind it to a fineness of 100 mesh powder, place it in a 50 ml beaker, cover the mouth of the beaker with a polyethylene film, and prick 25 holes with a needle. Then put it into a desiccator with a volume of about 10 liters together with the above-mentioned beaker containing the sol...

Embodiment 2

[0045] The glass instrument processing method is the same as in Example 1. Prepare 100 ml of 0.025 g / L GO aqueous solution, then add a certain amount of calcium chloride to prepare 0.01 mol / L calcium chloride solution, and adjust the pH of the solution to 7.5. Other follow-up operations are all the same as in Example 1, except that the reaction time is extended to 4 days. The resulting calcium carbonate particles see figure 2 , which is also a microsphere with a core-shell structure, with a size between 15-20 microns. However, compared with the microspheres obtained in Example 1, the surface is more crisp and rough, and the gaps between the formed sheets can be clearly seen.

Embodiment 3

[0047] The glass instrument processing method is the same as in Example 1. Prepare 100 milliliters of 0.0025 g / L GO aqueous solution, add a certain amount of calcium chloride to prepare 0.001 mol / L calcium chloride solution, adjust the pH of the solution to 8, cover the beaker containing the solution with a polyethylene film, the film Make 8 pinholes on the top. Take 20 grams of ammonium carbonate, grind it to a powder with a fineness of 100 mesh, put it in a 50 ml beaker, cover the mouth of the beaker with a polyethylene film, and prick 20 holes with a needle. Then put it into a desiccator with a volume of about 10 liters together with the above-mentioned beaker containing the solution, seal it, and start the reaction at a temperature of 30±1°C. After reacting for 5 hours, the resulting suspension was centrifuged, washed with water and centrifuged three times alternately. The obtained powder was dried at 40° C. for 12 hours under a vacuum of about 10 Pa. Get the desired pr...

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Abstract

The invention belongs to the technical field of inorganic salt materials, and specially relates to a preparation method of calcium carbonate particulates. The method comprises the following steps of adding 0.001 to 2 mol/L of a calcium salt into an 0.0005 to 1 g/L of additive solution to obtain a mixed solution, standing, adjusting a pH value of the mixed solution to a pH value of 5 to 12, through adopting different carbonate sources and corresponding different concentrations, carrying out a reaction at a temperature of 10 to 60 DEG C in an inclosed system for 10 minutes to 30 days, separating a product obtained by the previous step, and drying to obtain a desired product. Calcium carbonate particulates prepared by the method have different sizes which are in a range of 0.1 to 50 micrometers, different shapes such as a hexagonal petal shape and a globular shape, and high thermal stability. The method has the advantages of wide raw material source, low price, simple process, good operability, low pollution of adopted solvents, no toxic effect, good conformity with green chemistry requirements, and great potential for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of inorganic salt materials, and in particular relates to a preparation method of calcium carbonate particles. Background technique [0002] Calcium carbonate is one of the most widely occurring inorganic minerals in nature. On the one hand, as an important inorganic chemical material, calcium carbonate is widely used in building materials, rubber, plastics, coatings, papermaking, daily chemicals and other industries due to its wide range of raw materials, non-toxicity, large filling capacity, and excellent reinforcement performance. . On the other hand, as one of the main inorganic components of biominerals (such as invertebrate shells), calcium carbonate acts as a structural support, protection, etc. in organisms with its highly ordered structure and good mechanical properties. Function (S. Mann, G. A. Ozin, Nature 1996, 382 , 313). Calcium carbonate exists in three crystal forms in nature: calcite (t...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 沈丹萍武培怡
Owner FUDAN UNIV
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