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A kind of method that phase transfer-carbonization method prepares light calcium carbonate

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

Active Publication Date: 2015-08-19
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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, in "Preparation of Ultrafine Calcium Carbonate Particles by Membrane Dispersion Microreactor" (National Calcium Carbonate Industry Conference Proceedings 2008, Wang Kai), "Preparation and Characterization of Ultrafine Light Calcium Carbonate" (non-metallic mineral No. 35 in 2012, Zhang Zhenyi, etc.), "Calcium Carbonate for High Purity and Its Manufacturing Method" (public number 1587056A), "Manufacturing Method of Calcium Carbonate" (public number CN1395543A) and other documents and patents have introduced The synthetic method of high-quality calcium carbonate, but all do not fundamentally solve the above-mentioned problems

Method used

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  • A kind of method that phase transfer-carbonization method prepares light calcium carbonate

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Experimental program
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Effect test

Embodiment 1

[0024] 1. Add 4.58g of calcined quicklime to 100mL of water to obtain a quicklime coarse slurry with a calcium ion concentration of 0.6mol / L, stir at 300r / min at 25°C for 5min, and then mix 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 stirring at constant temperature for 40 minutes. After the reaction, filter at room temperature to obtain a soluble calcium ion solution.

[0025] 2. Heat the obtained calcium ion solution to 50°C, add 0.1g of isopropanol as a dispersant, and feed CO at a rate of 40mL / min 2 Gas, the stirring rate is 300r / min, constant temperature stirring reaction for 2h, the pH value of the system drops to 7.6; after the reaction is completed, age at 25°C for 1h, filter and separate the filtrate and filter cake, wash the filter cake with distilled water 2-3 times, Then dry at 60°C for 10 hours to obtain light calcium carbonate. The filtrate is suppleme...

Embodiment 2

[0028] 1. Add 6.12g of quicklime to 100mL of water to obtain a coarse slurry of quicklime, the concentration of calcium ions is 0.8mol / L, stir at room temperature for 5min, and then add phase Transfer agent ammonium citrate, and continue stirring at constant temperature for 20 minutes. After the reaction, filter at room temperature to obtain a soluble calcium ion solution.

[0029] 2. Heat the obtained calcium ion solution to 30°C, add 0.15g of sodium hexametaphosphate, and feed CO at a rate of 40mL / min. 2 gas, the stirring rate is 300r / min, and the reaction is stirred at constant temperature for 2h, and the pH value of the system drops to 7.5. After the reaction, age at 25°C for 1 hour, filter and separate the filtrate and filter cake, wash the filter cake 2-3 times with distilled water, and then dry it at 60°C for 10 hours to obtain light calcium carbonate. The filtrate is supplemented with a phase transfer agent for recycling.

[0030] In this example, the yield of calci...

Embodiment 3

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

[0033] 2. Heat the obtained calcium ion solution to 30°C, add 0.1g of sodium hexametaphosphate, and feed CO at a rate of 40mL / min. 2 Gas, the stirring rate is 300r / min, and the reaction is stirred at constant temperature for 2h, and the pH value of the system drops to 7.6. After the reaction, age at 25°C for 1 hour, filter and separate the filtrate and filter cake, wash the filter cake 2-3 times with distilled water, and then dry it at 60°C for 10 hours to obtain light calcium carbonate. The filtrate is supplemented with a phase transfer agent for re...

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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 present invention relates to a production method of nanometer light calcium carbonate, specifically a method for preparing light calcium carbonate by phase transfer-carbonization method, by purifying quicklime coarse slurry and then producing high-quality nanometer light calcium carbonate through carbonization calcium carbonate. 2. Background technology [0002] Light calcium carbonate, also known as precipitated calcium carbonate, or PPC for short, is mainly produced from limestone through processes such as roasting, digestion, carbonization, and drying. Light calcium carbonate has a history of more than 100 years as an extremely versatile industrial filler, and 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 / year (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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