A preparation method for light calcium carbonate by using a phase transfer-carbonization method

A light calcium carbonate, phase transfer technology, applied in calcium carbonate/strontium/barium, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problem of low production efficiency, wide particle size distribution, and long process time. and other problems to achieve the effect of increasing concentration, improving production efficiency and simple process

Active Publication Date: 2013-11-13
HEFEI UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the industrial production of light calcium carbonate is to use limestone as raw material to prepare lime cream slurry through calcination, digestion, wet screening and cyclone removal, and then carbonization to prepare light calcium carbonate, but this method still has problems such as carbonic acid The particle size of calcium products is difficult to be ultra-fine, the particle size distribution is wide and difficult to control, the quality of different batches of products is poor in repeatability, the process takes a long time, and the production efficiency is low.
In response to these problems, i...

Method used

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  • A preparation method for light calcium carbonate by using a phase transfer-carbonization method

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Experimental program
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Embodiment 1

[0024] 1. Add 4.58g of calcined quicklime to 100mL of water to obtain a crude quicklime slurry with a calcium ion concentration of 0.6mol / L. Stir at 300r / min for 5min at 25℃, and then according to the amount of phase transfer agent and calcium ion substance Add the phase transfer agent sodium gluconate at a ratio of 1.5:1, and continue to stir at constant temperature for 40 minutes. After the reaction is over, filter at room temperature to obtain a soluble calcium ion solution.

[0025] 2. Heat the obtained calcium ion solution to 50℃, add 0.1g isopropanol as a dispersant, and pass in CO at a rate of 40mL / min 2 Gas, stirring rate of 300r / min, constant temperature stirring reaction for 2h, the pH value of the system drops to 7.6; after the reaction, aging at 25℃ for 1h, filtering and separating the filtrate and filter cake, washing the filter cake 2-3 times with distilled water, Then dry at 60°C for 10 hours to obtain light calcium carbonate. Add the phase transfer agent to the f...

Embodiment 2

[0028] 1. Add 6.12g quicklime to 100mL water to obtain a crude quicklime slurry with a calcium ion concentration of 0.8mol / L, stir for 5min at room temperature, and then add phase transfer agent and calcium ion substance in a ratio of 1:1 The transfer agent ammonium citrate, continue to stir at constant temperature for 20 minutes. After the reaction is over, filter at room temperature to obtain a soluble calcium ion solution.

[0029] 2. Heat the resulting calcium ion solution to 30°C, add 0.15g of sodium hexametaphosphate, and pass in CO at a rate of 40mL / min 2 Gas, stirring rate is 300r / min, constant temperature stirring reaction for 2h, the pH value of the system drops to 7.5. After the completion of the reaction, it was aged at 25°C for 1 hour, filtered to separate the filtrate and filter cake, washed the filter cake 2-3 times with distilled water, and then dried at 60°C for 10 hours to obtain light calcium carbonate. Add the phase transfer agent to the filtrate and recycle ...

Embodiment 3

[0032] 1. Add 4.58g of quicklime to 100mL of water to obtain a crude quicklime slurry with a calcium ion concentration of 0.6mol / L. Stir at room temperature for 5 minutes, and then add phase transfer agent to calcium ion in a ratio of 2:1. Transfer agent lactic acid, continue to stir at constant temperature for 30 minutes. After the reaction is over, filter at room temperature to obtain a soluble calcium ion solution.

[0033] 2. Heat the resulting calcium ion solution to 30°C, add 0.1g of sodium hexametaphosphate, and pass in CO at a rate of 40mL / min 2 Gas, stirring rate of 300r / min, constant temperature stirring reaction for 2h, the pH value of the system drops to 7.6. After the completion of the reaction, it was aged at 25°C for 1 hour, filtered to separate the filtrate and filter cake, washed the filter cake 2-3 times with distilled water, and then dried at 60°C for 10 hours to obtain light calcium carbonate. Add the phase transfer agent to the filtrate and recycle it.

[003...

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Abstract

The invention discloses a preparation method for light calcium carbonate by using a phase transfer-carbonization method. Firstly, crude quicklime slurry is converted into a soluble calcium ion solution through a phase transfer reaction. Then, CO2 gas is fed into the soluble calcium ion solution and the calcium carbonate is obtained by precipitation and separation. According to the preparation method, in a phase transfer reaction process, calcium in the crude slurry is transferred into a liquid phase in forms of calcium ions, thereby achieving effective separation of the calcium ions from insoluble impurities in the crude slurry. The preparation method has advantages of simple technology, low production cost, high purity and uniform shapes and appearances of the CaCO3 produced, and the like. The preparation method can be applied for industrial production.

Description

1. Technical Field [0001] The invention relates to a method for producing nano light calcium carbonate, specifically a method for preparing light calcium carbonate by a phase transfer-carbonization method. The crude quicklime slurry is purified and then carbonized to produce high-quality nano light Calcium carbonate. 2. Background technology [0002] Light calcium carbonate, also known as precipitated calcium carbonate, or PPC for short, is mainly prepared from limestone as raw material through roasting, digestion, carbonization, and drying processes. Light calcium carbonate has been used as an extremely versatile industrial filler for more than 100 years. It is now widely used in papermaking, plastics, rubber, coatings, inks, adhesives, daily chemicals, food, medicine, feed, chemical building materials and Sealing materials and other industries. At present, the total output of calcium carbonate in the world is about 80 million tons per year (including heavy and light calcium c...

Claims

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Application Information

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IPC IPC(8): C01F11/18B82Y30/00
CPCY02P20/141
Inventor 杨保俊刘磊王百年何晓婷张胜男
Owner HEFEI UNIV OF TECH
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