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Control of shape and appearance of calcium carbonate

A technology of calcium carbonate and morphology, applied in the direction of calcium carbonate/strontium/barium, chemical methods for making liquids react with liquids, chemical instruments and methods, etc., can solve the problems of demanding technical requirements, environmental pollution, high cost, etc. The effect of removing environmental pollution, simple technical operation, and stable reaction system

Inactive Publication Date: 2006-08-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have to varying degrees the problems of demanding equipment, technical requirements, high cost, and the use of a large amount of organic substances such as surfactants, which will cause environmental pollution and other problems.

Method used

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  • Control of shape and appearance of calcium carbonate
  • Control of shape and appearance of calcium carbonate
  • Control of shape and appearance of calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The first step, 0.2g o-phenanthroline is dissolved in 80ml chloroform, with the rotating speed of 3000rpm violently stir about 15min, make the liquid film containing carrier, the microporous filter membrane (commercially available mixed cellulose ester, the average pore size is 0.22 microns) after drying, put it into the above-mentioned liquid membrane system and soak it for 20 hours, then take it out, clean the surface of the membrane with filter paper, put it into a self-made reaction device, and form a supported liquid membrane SLM in the middle, and the solution phase on the left and right isolation system. There is an electric stirrer on each side of the membrane.

[0024] In the second step, 0.5mol / L CaCl 2 solution, 0.2mol / L Na 2 CO 3 80ml of each solution was added to the left and right sides of the SLM respectively, and after stirring at a low speed for 5 minutes, the Na 2 CO 3 The product CaCO on the solution side 3 After centrifugation, wash with water,...

Embodiment 2

[0026] The first step, same as example 1,

[0027] In the second step, after 42 hours of low-speed stirring reaction, the Na 2 CO 3 The product CaCO on the solution side 3 After centrifugation, wash with water, acetone, and absolute ethanol successively to obtain the following: figure 2 Spherical CaCO shown 3 The product was finally stored in absolute ethanol.

Embodiment 3

[0029] In the first step, the concentration of the carrier in the first step of Example 1 is adjusted to 0.015mol L -1 , other unchanged.

[0030] Second step: adjust the reaction time of the second step in Example 1 to 10 minutes, and keep the others unchanged. get as image 3 and 4 Nanoflakes of CaCO shown 3 The product was finally stored in absolute ethanol.

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Abstract

A controlling method of calcium carbonate shape and appearance is carried out by dissolving flowing carrier into organic solvent, high-speed agitating, putting it into porous membrane with surface treatment, immersing for 24~48hrs, cleaning oil phase by filter paper, preparing sodium carbonate solution and calcium chloride solution, laying aside at both sides of the membrane to be used, adding 1% additive into sodium carbonate solution at one side, reacting for 0.1~48hrs, centrifugal depositing and cleaning to obtain CaCO3 product with cubic, spherical, prism, columnar and nanometer sheet shapes. It is cheap, simple, has easy control and no environmental pollution.

Description

technical field [0001] The invention relates to a method for controlling the morphology of calcium carbonate. Background technique [0002] Alkaline earth metal carbonates are an important class of industrial raw materials, widely used in coatings, optical glass, ceramics, catalysis, reinforcement, capacitors and polymer modifiers, etc., and recently also used as precursors for superconductors and ceramic materials. The preparation of inorganic materials with special sizes and morphologies is a key aspect of new materials applications (such as catalysis, pharmaceuticals, electronics, ceramics, coatings). [0003] Because morphology often brings about changes in properties, especially physical properties, such as surface area, crystal size, thermal properties, etc., especially nano-scale particles have excellent performance. Applying our new bionic method, it is more convenient to prepare morphology Good, calcium carbonate with various shapes such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B01J14/00B01D69/10
Inventor 吴庆生孙冬梅
Owner TONGJI UNIV
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