Preparation method for vaterite calcium carbonate crystals with layered structure

A layered structure, vaterite technology, applied in the preparation of calcium carbonate inorganic minerals and the preparation of vaterite calcium carbonate crystals, can solve the problem of high cost of raw materials, and achieve simple preparation process, high yield and easy control of reaction conditions. Effect

Inactive Publication Date: 2014-05-14
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using egg white protein, ionic liquid or hyperbranched polymer as organic additives, the obtained vaterite calcium carbonate is spherical, and the cost of raw materials is relatively high

Method used

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  • Preparation method for vaterite calcium carbonate crystals with layered structure
  • Preparation method for vaterite calcium carbonate crystals with layered structure
  • Preparation method for vaterite calcium carbonate crystals with layered structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Add 0.2 g of sodium lignosulfonate into 1.0 L of deionized water, stir and dissolve at 20°C, filter to remove insoluble impurities, and obtain a sodium lignosulfonate solution with a concentration of 0.2 g / L;

[0022] 2) Add 0.79g of calcium acetate to the aqueous solution of sodium lignosulfonate and stir to dissolve, then add 0.3g of urea and stir to dissolve (the concentration of urea is 0.5mmol / L), and mix the solution (the concentration of calcium acetate is 0.5m mol / L) into a sealed container and placed in a constant temperature oven at 60°C for 24 hours. After the constant temperature was over, the mixed solution was filtered and separated, washed and dried to obtain vaterite calcium carbonate crystals with a layered structure.

Embodiment 2

[0024] 1) Add 20.0g sodium lignosulfonate into 1.0L deionized water, stir and dissolve at 60°C to obtain a sodium lignosulfonate aqueous solution with a concentration of 20.0g / L;

[0025] 2) Add 1.58g of calcium acetate to the aqueous solution of sodium lignosulfonate and stir to dissolve, then add 3.6g of urea and stir to dissolve (the concentration of urea is 100.0mmol / L), and mix the solution (the concentration of calcium acetate is 10.0 mg mol / L) into a sealed container, and placed in a constant temperature oven, kept at 100°C for 5 hours. After the constant temperature was over, the mixed solution was centrifuged, washed, and dried to obtain vaterite calcium carbonate with a layered structure.

Embodiment 3

[0027] 1) Add 5g sodium polystyrene sulfonate into 1.0L deionized water, stir and dissolve at 40°C to obtain a sodium lignosulfonate aqueous solution with a concentration of 5.0g / L;

[0028] 2) Add 3.16g of calcium acetate to the polystyrene sodium sulfonate aqueous solution and stir to dissolve, then add 3.6g of urea and stir to dissolve (the concentration of urea is 280.0mmol / L), and the mixed solution (the concentration of calcium acetate is 20.0 mg mol / L) to a sealed container, and placed in a constant temperature oven, kept at 90°C for 18 hours. After the constant temperature was over, the mixed solution was filtered and separated, washed and dried to obtain vaterite calcium carbonate with layered structure.

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Abstract

The invention relates to a preparation method for inorganic calcium carbonate minerals, and in particular relates to a preparation method for vaterite calcium carbonate crystals with a layered structure. The method comprises the following steps: (1) adding a sodium sulfonate polymer into de-ionized water, and stirring and dissolving the sodium sulfonate polymer; (2) adding water-soluble calcium salt into the sodium sulfonate polymer solution, adding urea, and performing stirring and dissolving to obtain a mixed solution; (3) transferring the mixed solution to a sealed container, and placing the sealed container in a thermostatic baking oven for thermostatic treatment; (4) performing solid-liquid separation and washing on the mixed solution subjected to the thermostatic treatment so as to obtain the vaterite calcium carbonate crystals with the layered structure. The prepared vaterite calcium carbonate crystals with the layered structure has the purity of 100%, and is high in yield and monodispersion; compared with vaterite calcium carbonate crystals with a spherical structure, the vaterite calcium carbonate crystals with the layered structure are large in specific surface area, high in activity and applicable to the industries of rubber, plastics, papermaking, printing ink, building materials, coatings and the like; the preparation process is simple, reaction conditions are easy to control, and the vaterite calcium carbonate crystals with the layered structure are easy to industrially produce.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, in particular to a method for preparing calcium carbonate inorganic minerals, in particular to a method for preparing vaterite calcium carbonate crystals with a layered structure. Background technique [0002] Calcium Carbonate (CaCO 3 ) is an important inorganic powder material. As an inorganic filler (also known as inorganic filler), it is widely used in industries such as rubber, plastics, building materials, paper, coatings, paints, medicines, cosmetics, and inks. Calcium carbonate has a variety of crystal forms, mainly including calcite, aragonite, and vaterite. Among them, the crystal form of calcite is the most stable, and vaterite is mostly a metastable phase, which can be easily converted into calcite during the solvation process. Vaterite calcium carbonate has a large specific surface area, high solubility and dispersibility, and small specific gravity, which can effectivel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 郭红霞陈梦梦郭晓晨许鑫秦振平张国俊
Owner BEIJING UNIV OF TECH
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