Method for preparing nanometer calcium carbonate

A nano-calcium carbonate and calcium salt technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of difficult control of process conditions, difficult operation, high investment, etc., to achieve controllable particle size and crystal shape, short process flow, and easy operation difficult effect

Inactive Publication Date: 2006-10-11
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are three kinds of nano-calcium carbonate production methods such as intermittent carbonization method, continuous spray carbonization method and high gravity method, but there are some disadvantages in all three methods. The gas-liquid mass transfer of intermittent carbonization method is not ideal, resulting in difficult control of process conditions and High energy consumption and wide product particle size distribution; the continuous spray carbonization method has complex pipelines, difficult operation, high investment, and is almost no longer used at present; the equipment investment and energy consumption of the supergravity method are quite high
At the same time, these three methods all have common disadvantages such as non-single crystal form and poor dispersion in the synthesis process of nano-scale calcium carbonate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Mix 12 grams of cyclohexane, 4 grams of isoamyl alcohol, 4 grams of emulsifier Span-80 and 3.6 grams of emulsifier Tween-80, stir evenly, and then add 1 gram of mass in batches under constant stirring Concentration is after the calcium chloride solution of 23%, then remaining 0.4 gram Tween-80 joins in the mixing system, continues to stir for 13 minutes to obtain 25 grams of transparent emulsions (that is, every 100 grams of emulsions is stirred for 1.2 hours), each component mass Compared with cyclohexane: emulsifier: isoamyl alcohol: calcium chloride aqueous solution is 12:8:4:1;

[0015] (2) under constant stirring, add 0.2 gram of ammonium carbonate solid powder at a constant speed in the emulsion according to the reaction metering ratio, and continue to stir and react for 4 minutes after the ammonium carbonate has been added (that is, every 100 grams of the first step gained emulsion stirs for 16 minutes), Get nanometer calcium carbonate emulsion.

[0016] (3)...

Embodiment 2

[0018] Follow the steps of Example 1 to prepare nano-calcium carbonate powder, add calcium hydroxide to the organic phase after centrifugation in the third step, reflux and stir at 45°C to 50°C until the system is transparent or translucent, and then use reverse The calcium chloride emulsion required for the first step of the reaction is obtained by removing an appropriate amount of water by the osmosis method, and the mass ratio of each component is kept constant, and then enters the next round of production cycle.

Embodiment 3

[0020] (1) Stir and mix 15 grams of n-octane, 5 grams of isoamyl alcohol, and 10 grams of emulsifier polyacrylate, then add 1 gram of calcium chloride solution (mass concentration is 20%) in batches under constant stirring , then the remaining 1 gram of polyacrylate is added to the mixing system, and the stirring is continued for 25 minutes to obtain 42 grams of transparent emulsion (that is, every 100 grams of emulsion is stirred for 1 hour), and the mass ratio of each component is cyclohexane: emulsifier: isoamyl alcohol : Calcium chloride aqueous solution is 15:11:5:1;

[0021] (2) under constant stirring, add 0.2 gram of sodium carbonate solid powder at a constant speed in the emulsion according to the reaction metering ratio, continue to stir and react for 8 minutes after sodium carbonate has been added (that is, every 100 grams of the first step gained emulsion stirs for 19 minutes), Get nanometer calcium carbonate emulsion. The particle size distribution of the calcium...

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Abstract

The invention discloses a method for preparing nanometer calcium carbonate, employing reversed phase and microemulsion system for reaction in liquid to prepare cubic crystal nanometer calcium carbonate. It mainly comprises following steps: mixing hydrocarbon solvent, emulsifying agent and alcohols; adding water-soluble calcium salt solution on condition of stirring; then adding emulsifying agent and stirring continuously, getting transparent emulsion; then adding solid powder of water-soluble carbonate and getting nanometer calcium carbonate emulsion; and getting final product after saponification. The invention changes the air-solid reaction between carbon dioxide and calcium hydroxide to reaction in liquid, which avoids mass transfer for air and liquid in current process; the calcium ion and carbonate positive ion are only used as carriers and do not consume chemical substance, which can reduce production cost; and the reverse microemulsion is used as reaction medium, which can short process and reduce investment. The cubic crystal nanometer calcium carbonate is characterized by homogenous crystal system and granular size.

Description

technical field [0001] The invention relates to a preparation method of calcium carbonate, in particular to a preparation method of nanometer calcium carbonate. technical background [0002] As a typical new nanomaterial, nano-calcium carbonate has abundant raw materials and is widely used in rubber, coatings, plastics, adhesives, paper, ink, and other light industrial products such as cosmetics, toothpaste, medicine, food, etc. At present, there are three kinds of nano-calcium carbonate production methods such as intermittent carbonization method, continuous spray carbonization method and high gravity method, but there are some disadvantages in all three methods. The gas-liquid mass transfer of intermittent carbonization method is not ideal, resulting in difficult control of process conditions and The energy consumption is high, and the particle size distribution of the product is wide; the pipeline of the continuous spray carbonization metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 蔡炳新詹拥共
Owner HUNAN UNIV
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