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Method for preparing porous super fine calcium carbonate

An ultra-fine calcium carbonate and porous technology, applied in the field of calcium carbonate, can solve the problems of easily polluted environment, large power consumption, and no recycling of ammonium chloride, and achieves enhanced heat transfer, power saving, and flexible selection. Effect

Inactive Publication Date: 2006-04-12
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention can prepare porous calcium carbonate with a particle size of 1 to 10 μm, but this invention also has the following disadvantages: 1, the ammonium chloride generated is not recycled, and it is easy to pollute the environment; 2, the enhanced reaction device used in the reaction is stirring , large power consumption

Method used

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  • Method for preparing porous super fine calcium carbonate
  • Method for preparing porous super fine calcium carbonate
  • Method for preparing porous super fine calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0019] equipment:

[0020] Stirrer model: RW20.n Power: 70W

[0021] Manufacturer: Guangzhou IKA Co., Ltd.

[0022] Vacuum pump model: SHZ-IIIB Working voltage: 220V Power: 180W Pumping speed (single tube / double tube): 10 / 20L / min

[0023] Manufacturer: Zhejiang Linhai Jinggong Vacuum Equipment Factory

[0024] Circulation pump model: DP-125 Flow rate: 1L / min Working voltage: 220V

[0025] Working current: 1.3A Manufacturer: Xishan Water Pump Factory

[0026] Flowmeter model: LZB-10 glass rotameter Flow range: 6-60L / h

[0027] Manufacturer: Yuyao Yinhuan Flow Meter Co., Ltd.

[0028] Weigh 110gCaCl 2 with 158g NH 4 HCO 3 were prepared into 1000ml aqueous solution, and in NH 4 HCO 3 Add 0.002molH to the aqueous solution 2 SO 4 , colliding reaction in impinging flow reactor, flow rate 0.6L / min, reaction temperature 20°C. The reaction solution was filtered, and the filter cake was dried and ground. get 100gCaCO 3 , and its SEM photo after magnification of 200...

Embodiment 2

[0030] Medicines and equipment are the same as in Example 1.

[0031] Weigh 110gCaCl 2 with 158g NH 4 HCO 3 were prepared into 1000ml aqueous solution, and in NH 4 HCO 3 Add 0.004 mol MgCl2 to the aqueous solution, and react in an impingement flow reactor with a flow rate of 0.6 L / min and a reaction temperature of 20°C. The reaction solution was filtered, and the filter cake was dried and ground. get 100gCaCO 3 , and its SEM photo after magnification of 30000 times is shown in image 3 .

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Abstract

A process for preparing the porous superfine calcium carbonate includes such steps as respectively preparing the aqueous solution of CaCl2 and the aqueous solution of NH4HCO3 and CO2, isometric colliding reaction while controlling flow and temp, filtering, recovering the mother liquid of ammonium chloride, drying filtered cake, grinding to obtain product, and preparing the ammonium chloride crystals from its mother liquid.

Description

technical field [0001] The present invention relates to a kind of calcium carbonate, more specifically relates to a kind of preparation method of porous, superfine calcium carbonate. Background technique [0002] Ultrafine calcium carbonate has a large specific surface area and strong adsorption force, and is widely used in plastics, papermaking, coatings, inks, daily chemicals and other industries. Most of its production processes use CO 2 Introduce Ca(OH) 2 Suspension method. Porous ultrafine calcium carbonate has better performance than ultrafine calcium carbonate in theory, but there are few related preparation reports. China Invention Patent Application No. 03101388.0, titled "Production Method of Porous Calcium Carbonate", discloses a method for preparing porous calcium carbonate by liquid-liquid reaction. The process flow is: a. According to the chemical reaction formula <chemistry num="001"> <chem file="200510031091_cml001.xml" / > < / chemistry> ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/24C01F11/18C01B32/60
Inventor 郁平
Owner SHANGHAI INST OF TECH
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