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Preparation method of stable hollow calcium carbonate particles with controllable particle size

A technology of calcium carbonate and particle size, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of large amount of chemical additives, difficult to guarantee product purity, stability to be verified, etc., to achieve high average particle size and stability, production The effect of low cost and low raw material requirements

Active Publication Date: 2021-04-09
GUANGXI HUANA NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this invention is that the product has a small particle size, a large specific surface area, a rounded spherical shape, and good performance. The raw material used is calcium-containing waste liquid, and the cost is low; the disadvantages are also obvious: the amount of chemical additives used in the whole process is large, and the purity of the product is difficult to guarantee. The patent does not involve the study of the crystal form of calcium carbonate, and its stability needs to be verified

Method used

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  • Preparation method of stable hollow calcium carbonate particles with controllable particle size
  • Preparation method of stable hollow calcium carbonate particles with controllable particle size
  • Preparation method of stable hollow calcium carbonate particles with controllable particle size

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A kind of preparation method of the hollow calcium carbonate particle of stable, particle size controllable, comprises the steps:

[0035] (1) First prepare 400ml of sodium carbonate solution and calcium chloride solution with a concentration of 0.4mol / L respectively, add magnesium hydroxide crystal form control agent which is 5% of the mass of calcium carbonate after reaction to the calcium chloride solution, stir and mix Uniform;

[0036] (2) Control the temperature at 20°C and the stirring speed at 600rmb / min. Add the sodium carbonate solution to the calcium chloride through a peristaltic pump at a rate of 40ml / min. After the addition is complete, continue to stir for 5 minutes to obtain a suspension;

[0037] (3) After the reaction, add 95% ethanol to the suspension and store it for 2 hours, filter it, dehydrate it by pressure filtration, microwave dry it at 100°C for 2.5 hours, crush it, and classify it to obtain hollow calcium carbonate particles.

[0038] The ca...

Embodiment 2

[0040] A kind of preparation method of the hollow calcium carbonate particle of stable, particle size controllable, comprises the steps:

[0041] (1) First prepare 400ml of sodium carbonate solution and calcium chloride solution with a concentration of 1mol / L respectively, add barium hydroxide crystal form control agent which is 3% of the mass of calcium carbonate after reaction to the calcium chloride solution, stir and mix evenly ;

[0042] (2) Control the temperature at 35°C and the stirring speed at 900rmb / min. Add the sodium carbonate solution to the calcium chloride through a peristaltic pump at a rate of 50ml / min. After the addition is complete, continue to stir for 5 minutes to obtain a suspension;

[0043] (3) After the reaction, add acetone to the suspension and store it for 3 hours, filter it, dehydrate it by pressure filtration, microwave dry it at 80°C for 3 hours, pulverize it, and classify it to obtain hollow calcium carbonate particles.

[0044] The calcium ca...

Embodiment 3

[0046] A kind of preparation method of the hollow calcium carbonate particle of stable, particle size controllable, comprises the steps:

[0047] (1) First prepare 400ml of sodium carbonate solution and calcium chloride solution with a concentration of 0.1mol / L respectively, add magnesium hydroxide crystal form control agent which is 5% of the mass of calcium carbonate after reaction to the calcium chloride solution, stir and mix Uniform;

[0048] (2) Control the temperature at 40°C and the stirring speed at 1000rmb / min. Add the sodium carbonate solution to the calcium chloride through a peristaltic pump at a rate of 40ml / min. Continue stirring for 5 minutes after the addition is complete to obtain a suspension;

[0049] (3) After the reaction, add acetone to the suspension and store it for 3 hours, filter, dehydrate by pressing, microwave dry at 110°C for 2 hours, pulverize, and classify to obtain hollow calcium carbonate particles.

[0050] The calcium carbonate that the pr...

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Abstract

The invention discloses a preparation method of stable hollow calcium carbonate particles with controllable particle size, which comprises the following steps: respectively preparing a sodium carbonate solution and a calcium chloride solution with the same amount and concentration, adding a magnesium hydroxide and / or barium hydroxide crystal form control agent into the calcium chloride solution, and uniformly stirring; controlling the temperature to be 20-40 DEG C and the stirring rotating speed to be 600-1000rmb / min, adding the sodium carbonate solution into calcium chloride through a peristaltic pump, and continuously stirring for 5-10min after the addition is finished, so as to obtain turbid liquid; and after the reaction is finished, adding ethanol or acetone into the turbid liquid, preserving for 1-3h, filtering, carrying out filter pressing dehydration, drying, crushing and grading to obtain the hollow calcium carbonate particles. The hollow calcium carbonate product produced by the method has high average particle size and stability, the specific surface area can reach 10-25 m < 2 > / g, the preparation process is simplified, the production efficiency is high, the requirements on raw materials are not high, the production cost is low, and industrial production is easy to realize.

Description

technical field [0001] The invention relates to the technical field of inorganic materials, in particular to a method for preparing stable hollow calcium carbonate particles with a controllable particle size. Background technique [0002] Calcium carbonate, as a filler in great demand, can be used in construction, medicine, plastics, rubber, cement and other fields. The unique properties exhibited by products with different shapes and particle sizes continue to expand the application range of calcium carbonate, making it no longer limited to being a composite filler of other materials. Calcium carbonate is a solid particle that is insoluble in water. Hollow calcium carbonate with a cavity is expected to be used as a drug-carrying carrier in the medical field to accurately deliver drugs to the diseased site, or compound with other raw materials to form a lighter density functional materials. It is difficult to solve the stability problem caused by the high specific surface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/18C01P2004/34C01P2006/12C01P2004/01C01P2004/62C01P2006/40
Inventor 黄志钦朱勇杨爱梅黄炜波马秀玲刘燕玲
Owner GUANGXI HUANA NEW MATERIALS TECH CO LTD
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