Method and device for preparing vaterite-type calcium carbonate powder

A technology of calcium carbonate powder and vaterite, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problem of low purity of the vaterite phase, achieve the effects of short cycle, simple raw materials and reaction system, and overcome the low concentration of calcium chloride

Inactive Publication Date: 2014-02-05
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The basic reaction system of the method described in these patents is the aforementioned metathesis reaction. Except that the sodium chloride generated in the reaction process is difficult to remove, the disadvantages of the...

Method used

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  • Method and device for preparing vaterite-type calcium carbonate powder
  • Method and device for preparing vaterite-type calcium carbonate powder
  • Method and device for preparing vaterite-type calcium carbonate powder

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) Add 7.5g of calcium chloride powder into a beaker of 92.5g of distilled water, and after stirring and fully reacting or dissolving, a calcium chloride aqueous solution with a concentration of 7.5% is obtained;

[0034] (2) Add 13.26g of ammonia water into a beaker filled with calcium chloride aqueous solution, stir to make it fully mixed, and obtain a mixed solution with a pH value of 11.2;

[0035] (3) CO 2The gas is passed into the above-mentioned alkaline solution through the gas micropore diffuser, and calcium carbonate precipitates are gradually formed. Take a sample within 1-2 minutes of just forming the precipitate, and then take a sample every 10 minutes. The obtained samples were tested by XRD, and the results showed that the calcite phase was obtained when the precipitation was just formed, and the vaterite phase was obtained later, and the vaterite phase calcium carbonate powder with negligible content of the calcite phase was obtained after the reaction...

Embodiment 2

[0039] (1) Add 10.5g of calcium chloride powder into a beaker of 89.5g of distilled water, and after stirring and fully reacting or dissolving, a calcium chloride aqueous solution with a concentration of 10.5% is obtained;

[0040] (2) Add 14.08g of ammonia water into a beaker filled with calcium chloride aqueous solution, stir to make it fully mixed, and obtain a mixed solution with a pH value of 11.6;

[0041] (3) CO 2 The gas is passed into the above alkaline solution through the gas micropore diffuser to form calcium carbonate precipitate, and the precipitate is separated from the clear liquid by vacuum filtration device;

[0042] (4) Considering the NH brought in by 14.08g ammonia water 4 + (1.92g, NH in ammonia 4 The concentration of OH is calculated as 26.5%) and Cl - (6.72g) NH produced by the reaction 4 Cl (8.64g) remained in the clear liquid, and in the above clear liquid (theoretical amount of the clear liquid was 111.14g, 108.93g was obtained after filtration,...

Embodiment 3

[0046] (1) Add 7.5g of calcium chloride powder into a beaker of 92.5g of distilled water, and after stirring and fully reacting or dissolving, a calcium chloride aqueous solution with a concentration of 7.5% is obtained;

[0047] (2) Add 13.26g of ammonia water into a beaker filled with calcium chloride aqueous solution, stir to make it fully mixed, and obtain a mixed solution with a pH value of 11.2;

[0048] (3) CO 2 The gas is passed into the above alkaline solution through the gas micropore diffuser to form calcium carbonate precipitate, and the precipitate is separated from the clear liquid by vacuum filtration device;

[0049] (4) Considering the NH brought in by 13.26g ammonia water 4 + (1.81g, NH in ammonia 4 The concentration of OH is calculated as 26.5%) and Cl - (4.8g) NH produced by the reaction 4 Cl (6.61g) remained in the clear liquid, and in the above clear liquid (theoretical amount of the clear liquid was 110.56g, 108.32g was obtained after filtration, co...

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Abstract

The invention discloses a method and a device for preparing vaterite-type calcium carbonate powder. The method comprises the following steps: introducing a CO2 gas to a calcium chloride aqueous solution of which the pH value is adjusted by ammonia water, so as to prepare pure vaterite-type calcium carbonate powder; and preparing the pure vaterite-type calcium carbonate powder from the reacted solution through a multi-stage carbonization device. By adopting the method, the prepared calcium carbonate powder is controlled into a pure vaterite type through the concentration of calcium chloride, and the solution system after each stage of reaction is fully utilized through the multi-stage carbonization device. Thus, the device disclosed by the invention has the characteristics of being controllable in calcium carbonate powder crystal type, short in reflection period, simple in reaction system, energy-saving and environment-friendly and the like.

Description

[0001] technical field [0002] The invention relates to a preparation method and device of vaterite type calcium carbonate powder, belonging to the technical field of preparation of inorganic non-metallic powder. Background technique [0003] According to the preparation method, calcium carbonate is divided into heavy calcium carbonate (heavy calcium carbonate, GCC) and light calcium carbonate (light calcium carbonate, also known as precipitated calcium carbonate, PCC). Heavy calcium is a product obtained by cleaning, crushing, pulverizing, grading, and separating minerals such as limestone and dolomite containing more than 90% calcium carbonate by physical methods. Light calcium is prepared by chemical methods. According to whether it is activated or not, it can be divided into ordinary light calcium carbonate and nano-active calcium carbonate. [0004] Since mechanical pulverization cannot reach the nanometer level, the preparation of nano calcium carbonate is all prepar...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 蒋久信许冬东张盈张高文
Owner HUBEI UNIV OF TECH
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