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Preparation method of superstructure aragonite calcium carbonate crystal

A technology of calcium carbonate and superstructure, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of complex preparation process and difficulty in large-scale production, and achieve the effect of simple preparation method, easy control of conditions, and high crystal phase purity

Inactive Publication Date: 2009-09-23
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of inducing the growth of aragonite calcium carbonate by active biofilm such as bean sprouts or AOT monolayer film has problems such as complicated preparation process and difficulty in large-scale production.

Method used

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  • Preparation method of superstructure aragonite calcium carbonate crystal
  • Preparation method of superstructure aragonite calcium carbonate crystal
  • Preparation method of superstructure aragonite calcium carbonate crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Add 2g of PAANa into 998g of deionized water, stir and dissolve at 30°C to obtain a PAANa aqueous solution with a concentration of 0.2wt%;

[0024] 2) Add 0.055g of calcium chloride to the PAANa aqueous solution and stir to dissolve, then add 0.03g of urea and stir to dissolve, transfer the mixed solution (the concentration of calcium chloride is 0.5mmol / L) to a sealed container, and place at a constant temperature In an oven, keep the temperature at 60° C. for 24 hours. After the constant temperature is over, filter and separate the mixed solution, wash, and dry to obtain white superstructure aragonitic calcium carbonate crystals.

Embodiment 2

[0026] 1) Add 10g of PAANa into 990g of deionized water, stir and dissolve at 60°C to obtain a PAANa aqueous solution with a concentration of 10wt%;

[0027] 2) Add 5.55g of calcium chloride to the PAANa aqueous solution and stir to dissolve, then add 24.0g of urea and stir to dissolve, transfer the mixed solution (the concentration of calcium chloride is 50mmol / L) to a sealed container, and place in a constant temperature oven In the process, keep the temperature at 110° C. for 4 hours. After the constant temperature is over, the mixed solution is centrifuged, washed, and dried to obtain white superstructure aragonite calcium carbonate crystals.

Embodiment 3

[0029] 1) Add 6g of PAANa into 994g of deionized water, stir and dissolve at 40°C to obtain a PAANa aqueous solution with a concentration of 6wt%;

[0030] 2) Add 2.22g of calcium chloride to the PAANa aqueous solution and stir to dissolve, then add 3.6g of urea and stir to dissolve, transfer the mixed solution (the concentration of calcium chloride is 20mmol / L) to a sealed container, and place in a constant temperature oven In the process, keep the temperature at 90° C. for 18 hours. After the constant temperature is over, the mixed solution is separated by filtration, washed, and dried to obtain white superstructure aragonite calcium carbonate crystals.

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Abstract

The invention relates to a preparation method of superstructure aragonite calcium carbonate crystal, belonging to the technical field of inorganic material. The existing method for preparing the aragonite calcium carbonate has the problems that the preparation technique is complex and the reaction condition is not easy to control, etc. The preparation method comprises the following steps of: adding water-soluble calcium salt and urea into hydrophilic polymer solution in sequence, stirring, dissolving, transferring the obtained mixing solution to a sealed container, placing the sealed container in a constant temperature oven, keeping the temperature of 60-110 DEG C constantly for 4 to 24 hours, carrying out solid-liquid separation on the mixed solution after the constant temperature is ended, cleaning and obtaining the superstructure aragonite calcium carbonate crystal. The invention has the advantages of simple preparation technique and easy control of condition and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, in particular to a preparation method of calcium carbonate inorganic salts, in particular to a preparation method of high-purity superstructure aragonite calcium carbonate crystals. Background technique [0002] Calcium carbonate is the most abundant biological mineral in nature, and it is widely used in industrial fields, such as coatings, plastics, rubber, and papermaking. There are various crystal forms of calcium carbonate, mainly including three crystal forms of calcite, aragonite and vaterite. At normal temperature and pressure, calcite is a stable crystal form, and aragonite and vaterite are metastable crystal forms. Aragonite calcium carbonate widely exists in natural organisms, especially in shell nacre, and its hardness is the largest among calcium carbonate phases. Synthetic aragonite-type calcium carbonate is a new type of needle-like whisker material that has emerged in...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 郭红霞秦振平王群于朋张彤
Owner BEIJING UNIV OF TECH
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