Method for preparing flaky calcite calcium carbonate crystal

A calcite, calcium carbonate technology, applied in the direction of calcium carbonate/strontium/barium, crystal growth, chemical instruments and methods, etc., can solve the problems of complex process, large particle size of calcium carbonate, uneven distribution, etc., to achieve simple process, The effect of uniform particle size and low price

Inactive Publication Date: 2011-01-05
HENAN UNIV OF URBAN CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the carbonization method are: the process is complicated; the solubility of calcium hydroxide is very small, and the size of the bubbles containing carbon dioxide is often large.

Method used

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  • Method for preparing flaky calcite calcium carbonate crystal
  • Method for preparing flaky calcite calcium carbonate crystal
  • Method for preparing flaky calcite calcium carbonate crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: the mass ratio of calcium chloride and sodium carbonate is 1.4: 1

[0022] (1) in the sodium carbonate solution that 63mL concentration is 0.52mol / L, add the boric acid that is sodium carbonate quality 0.8% as crystal formation control agent, control solution temperature is 40 ℃;

[0023] (2) Take 37 mL of calcium chloride solution with a concentration of 1.24 mol / L, and control the temperature of the solution to be 40° C.;

[0024] (3) Add the calcium chloride solution dropwise to the sodium carbonate solution at a rate of 0.5mL / min under the conditions of a stirring speed of 200r / min and a temperature of 40°C. Continue to stir at constant temperature for 0.5h, then stand at room temperature for 12h, and filter to obtain a precipitate;

[0025] (4) Repeatedly wash the precipitate with deionized water to neutrality, remove the chloride ions adsorbed on the surface of the precipitate through washing, filter, and vacuum-dry at 40° C. for 4 hours to obtain t...

Embodiment 2

[0027] Embodiment 2: the mass ratio of calcium chloride and sodium carbonate is 1.6: 1

[0028] (1) adding oxalic acid that is 2.2% of the quality of sodium carbonate as a crystal form control agent in 54mL of sodium carbonate solution with a concentration of 1.6mol / L, and controlling the solution temperature to be 55°C;

[0029] (2) Take 46 mL of calcium chloride solution with a concentration of 2.9 mol / L, and control the temperature of the solution to be 55° C.;

[0030] (3) Add the calcium chloride solution dropwise to the sodium carbonate solution at a rate of 0.8mL / min under the condition that the stirring speed is 300r / min and the temperature is 55°C. Continue to stir at constant temperature for 1h, then stand at room temperature for 20h, and filter to obtain a precipitate;

[0031] (4) Repeatedly wash the precipitate with deionized water to neutrality, remove the chloride ions adsorbed on the surface of the precipitate through washing, filter, and vacuum dry at 55° C. ...

Embodiment 3

[0033] Embodiment 3: the mass ratio of calcium chloride and sodium carbonate is 1.7: 1

[0034] (1) in the sodium carbonate solution that 50mL concentration is 2.7mol / L, add the boric acid that is sodium carbonate quality 3.5% and make crystal formation control agent, control solution temperature is 70 ℃;

[0035] (2) Take 50 mL of calcium chloride solution with a concentration of 4.6 mol / L, and control the temperature of the solution to be 70° C.;

[0036] (3) Add the calcium chloride solution dropwise to the sodium carbonate solution at a rate of 1.2mL / min under the condition that the stirring speed is 400r / min and the temperature is 70°C. Continue to stir at constant temperature for 1.5h, then stand at room temperature for 24h, and filter to obtain a precipitate;

[0037] (4) Repeatedly wash the precipitate with deionized water to neutrality, remove the chloride ions adsorbed on the surface of the precipitate through washing, filter, and vacuum dry at 70° C. for 2.5 hours ...

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Abstract

The invention relates to a method for preparing a flaky calcite calcium carbonate crystal, which comprises the following steps of: according to the substance amount ratio of calcium chloride to sodium carbonate as 1.4-1.8:1, adding boric acid or oxalic acid as a crystal shape control agent accounting for 0.8-4.2 percent of the mass of the sodium carbonate into 0.52-3.96mol/L of sodium carbonate solution, and controlling the solution temperature to be 40-90 DEG C; taking 1.24-6.32mol/L of calcium chloride solution, and controlling the solution temperature to be 40-90 DEG C; dropwise adding the calcium chloride solution into the sodium carbonate solution, stirring as dropwise adding, then stirring at constant temperature for 0.5-2 hours, settling at room temperature for 12-36 hours, and filtering to obtain precipitates; and repeatedly washing the precipitates with water to be neutral, removing adsorbed chloride ions, then filtering, and carrying out vacuum drying at the temperature of 40-80 DEG C to prepare the flaky calcite calcium carbonate crystal. A product is confirmed as a calcite crystal through X-ray diffraction analysis; and a scanning electron microscope result shows that the crystal is regularly flaky. The method has the advantages of low cost, simple process and regular product appearance.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and in particular relates to a method for preparing flaky calcite calcium carbonate crystals. Background technique [0002] As an important inorganic material, calcium carbonate is widely used in plastics, rubber, papermaking, coatings and other industries due to its wide range of raw materials, non-toxicity, large filling capacity and excellent reinforcing performance. Calcium carbonate usually exists in the form of calcite, aragonite, and vaterite in nature, but under normal temperature and pressure conditions, the calcite phase is its only thermodynamically stable phase. [0003] In recent years, with the rapid development of the national economy, the domestic demand for calcium carbonate is increasing, and different industries have different requirements for the form of calcium carbonate. Flake calcium carbonate is a crystal type developed in recent years. Compared with o...

Claims

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Application Information

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IPC IPC(8): C30B7/14C30B29/22C30B29/64C01F11/18
Inventor 李长有郭一飞宋丰明宋军超刘雪平杨治广
Owner HENAN UNIV OF URBAN CONSTR
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