Preparation method for light calcium carbonate

A light calcium carbonate, mass fraction technology, applied in calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve problems such as complex production process, achieve short carbonization reaction time, easy Commercial production, good gas-liquid mass transfer effect

Active Publication Date: 2017-04-26
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this carbonization process usually needs to be carbonized in multiple stages, and the product slurry obtained by carbonization still needs to go through dehydration and drying steps, and the production process is complicated.

Method used

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  • Preparation method for light calcium carbonate
  • Preparation method for light calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1 g Ca(OH) 2 The solid powder was dissolved in 999 g of deionized water and configured as Ca(OH) with a mass fraction of 0.1wt%. 2 solution. CO control 2 Gas flow at 3 L / min, Ca(OH) 2 The solution is pumped to the two-fluid atomizing nozzle through a peristaltic pump, and is absorbed by CO 2 Dispersed into micron-sized droplets, followed by drying by a 400°C hot air stream. Obtain light calcium carbonate powder. Depend on figure 1 It can be seen from the scanning electron microscope photos that the calcium carbonate prepared by the present invention has a spherical structure with a particle size of about several microns, and is composed of two crystal forms of calcium carbonate, calcite and vaterite.

Embodiment 2

[0015] 3 g Ca(OH) 2 The solid powder was dissolved in 997 g of deionized water and configured as Ca(OH) with a mass fraction of 0.3wt%. 2 solution. CO control 2 Gas flow rate of 12 L / min, Ca(OH) 2 The solution is pumped to the two-fluid atomizing nozzle through a peristaltic pump, and is absorbed by CO 2 Disperse into micron-sized droplets, followed by drying by a hot air stream at 300°C. Obtain spherical light calcium carbonate powder.

Embodiment 3

[0017] 6 g Ca(OH) 2 The solid powder was dissolved in 994 g of deionized water and configured as Ca(OH) with a mass fraction of 0.6wt%. 2 solution. CO control 2 Gas flow rate is 6 L / min, Ca(OH) 2 The solution is pumped to the two-fluid atomizing nozzle through a peristaltic pump, and is absorbed by CO 2 Dispersed into micron-sized droplets, followed by drying by a hot air stream at 200 °C. Obtain spherical light calcium carbonate powder.

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Abstract

The invention discloses a preparation method for light calcium carbonate. In the method, a Ca(OH)2 turbid liquid and CO2 compressed gas respectively pass through two fluid atomizing spray nozzles, wherein the Ca(OH)2 turbid liquid is dispersed into micron-scale droplets by high-pressure CO2, and meanwhile, a carbonization reaction is carried out to generate the light calcium carbonate, which is rapidly dried by hot air flow to directly prepare light calcium carbonate powder. Compared with a conventional carbonization method, in the method, the Ca(OH)2 droplets, being a dispersion phase, and the CO2 gas, being a continuous phase, are contacted in forward direction, so that because the atomized Ca(OH)2 turbid liquid has small droplets, contact area of gas-liquid two-phase mass transfer is effectively increased. Meanwhile, gas-liquid mass transfer rate is increased since the Ca(OH)2 droplets have large speed difference from the CO2 gas, thereby completing the carbonization reaction in a short time. The sprayed droplets are rapidly dried by hot air flow after the carbonization reaction, thereby producing the light calcium carbonate powder.

Description

technical field [0001] The invention relates to a method for continuously preparing light calcium carbonate. Background technique [0002] As an important inorganic powder material, light calcium carbonate is widely used in the fields of plastics, rubber, adhesives, coatings, cosmetics, textiles and sewage purification, and the industrial demand is increasing day by day. The preparation methods of light calcium carbonate are mainly carbonization method and double decomposition method, in addition to microemulsion method, emulsion liquid film method, sol-gel method. The carbonization method is the core process of nano calcium carbonate production, it is through CO 2 with Ca(OH) 2 Preparation of calcium carbonate by gas-liquid reaction between slurries. In industrial production, the selected limestone is usually calcined first to obtain quicklime and kiln gas. Quicklime undergoes a digestion process to obtain Ca(OH) 2 suspension; kiln gas is purified as CO 2 Source and C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/181C01P2002/30C01P2002/72C01P2004/03C01P2004/32C01P2004/61
Inventor 姜海波张玲程娜李春忠陈鹏宇周梅芳
Owner EAST CHINA UNIV OF SCI & TECH
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