Process for preparing superfine light calcium carbonate

A technology of light calcium carbonate and equipment, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, addition of inorganic compounds, etc., can solve the problems affecting the application of light calcium carbonate, large particle size, wide particle size range, etc. , to achieve the effect of fine particle size, high whiteness and narrow particle size distribution

Active Publication Date: 2006-12-27
SHANGHAI DONGSHENG NEW MATERIALS
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Problems solved by technology

[0002] Light calcium carbonate is an important inorganic chemical raw material. The fineness of light calcium carbonate powder produced by ordinary carbonization method is generally about 400 mesh, the particle size is large, and the aggregation phenomenon between particles is serious, which affects the light calcium carbonate powder. Application of Calcium
[0003] CN03115660.6 patent discloses a kind of preparation method of ultrafine light calcium carbonate, this patent adopts conventional dispersant, adopts the method for grinding ultrafine light calcium carbonate with about 400 mesh light calcium carbonate, therefore, this patent There is an obvious defect in the disclosed technology. The ultrafine light calcium carbonate produced by it has a wide range of particle sizes and uneven distribution. The resulting slurry has high viscosity and poor stability.

Method used

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  • Process for preparing superfine light calcium carbonate
  • Process for preparing superfine light calcium carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0017] In the calcium hydroxide (average particle diameter is 10 μ m) water slurry that weight concentration is 20%, add the phosphate ammonium salt that is 1% of superfine calcium hydroxide dry weight and contain 12 carbon atoms, add simultaneously as hydrogen 0.3% sodium polyacrylate of calcium oxide dry weight, the calcium hydroxide slurry is sent into 5 vertical sand mills of 80 liters in series with a pneumatic diaphragm pump, and the feed flow rate is 8 liters / minute. At the same time, pass pure carbon dioxide gas from the bottom of each sand mill, the flow rate of carbon dioxide is 50 liters per minute, and turn on the sand mill to make grinding and carbonization proceed simultaneously. The slurry discharged from the fifth sand mill is completely carbonized, the pH of the slurry is 6.7, and the carbonization temperature is 45°C. The average particle size of the obtained ultrafine calcium carbonate is 0.4 μm, and the particles smaller than 2 μm account for the total numbe...

Embodiment 2

[0019] In the calcium hydroxide (average particle diameter is 5 μm) water slurry that weight concentration is 5%, add the sodium polyacrylate that is 0.8% of calcium hydroxide dry weight, calcium hydroxide slurry is sent into two sides with pneumatic diaphragm pump. A series of 300 liter vertical sand mills with a feed flow rate of 15 liters / min. At the same time, pass pure carbon dioxide gas from the bottom of each sand mill, the flow rate of carbon dioxide is 90 liters per minute, and turn on the sand mill to make grinding and carbonization proceed simultaneously. The slurry discharged from the second sand mill is completely carbonized, the pH of the slurry is 7.0, and the carbonization temperature is 70°C. The average particle size of the obtained ultrafine calcium carbonate is 0.5 μm, and the particles smaller than 2 μm account for the total number of particles. 98% of.

Embodiment 3

[0021] In the common calcium hydroxide (average particle diameter is 5 μ m) water slurry that weight concentration is 25%, add the phosphate potassium salt that is 2% of calcium hydroxide dry weight and contain 14 carbon atoms, calcium hydroxide slurry Feed into a stirring mill of 3 cubic meters, pass the mixed gas containing 25% carbon dioxide volume concentration from the bottom of the stirring mill, open the stirring mill, stir and grind carbonization for 8 hours with 80 rpm, the pH of the water slurry is 6.7, the carbonization temperature is 30°C, and the gas flow rate of the mixed gas is 300 liters / minute. The average particle size of the obtained superfine calcium carbonate is 0.5 μm, wherein particles smaller than 2 μm account for 93% of the total particle number.

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Abstract

The invention discloses a preparing method of super-fine lightweight calcium carbonate, which comprises the following steps: adding disperser in the calcium hydroxide slurry; sending the slurry to the grinding equipment; inputting carbon dioxide from bottom of grinding equipment to carbonize; synchronizing grinding and carbonizing. The disperser is one or two of phosphate, sodium polyacrylate, triethanolamine, sodium pyrophosphate, sodium polyphosphate or hexametaphosphate. The even grain size of super-fine calcium carbonate is 0.2-2.0 mum with 60-100 percent grain number with less than 2 mum grain size, which is fit for paper making filler or paper coating dye.

Description

technical field [0001] The invention relates to a preparation method of ultrafine light calcium carbonate. Background technique [0002] Light calcium carbonate is an important inorganic chemical raw material. The fineness of light calcium carbonate powder produced by ordinary carbonization method is generally about 400 mesh, the particle size is large, and the aggregation phenomenon between particles is serious, which affects the light calcium carbonate powder. Calcium application. [0003] CN03115660.6 patent discloses a kind of preparation method of ultrafine light calcium carbonate, this patent adopts conventional dispersant, adopts the method for grinding ultrafine light calcium carbonate with about 400 mesh light calcium carbonate, therefore, this patent There is an obvious defect in the disclosed technology, and the ultrafine light calcium carbonate produced by it has a wide range of particle sizes and uneven distribution, and the prepared slurry has high viscosity a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B01F17/00B01F17/14B01F17/16D21H17/67D21H19/38C09K23/00C09K23/14C09K23/16
Inventor 施晓旦王彦华
Owner SHANGHAI DONGSHENG NEW MATERIALS
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