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Flake light calcium carbonate and its preparing method and application

A light calcium carbonate, flake technology, applied in the fields of calcium carbonate/strontium/barium, textile and papermaking, fiber raw material processing, etc. , The effect of good process stability and simple process

Active Publication Date: 2007-06-27
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantages of the two-step method are: first, the reaction process is carried out in two steps, which is cumbersome, and the second step carbonization process consumes more energy; Without destroying the crystal form, the conditions are difficult to control, and the quality of the obtained product is unstable
But the yield is low, the stability is poor, and the ratio of diameter to thickness is small

Method used

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  • Flake light calcium carbonate and its preparing method and application
  • Flake light calcium carbonate and its preparing method and application
  • Flake light calcium carbonate and its preparing method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] will be 1m 3 1.2mol / L ZrOCl 2 8H 2 O aqueous solution with 1m 3 The aqueous reaction of sodium dihydrogen phosphate of 1.2mol / L prepares Zr(HPO 4 ) 2 Gel slurry, Zr(HPO 4 ) 2 The gel slurry is placed in a 3 m tank with a reflux condenser 3 Reactor, then heated to boiling, boiled and refluxed for 5 hours, filtered, washed to obtain flaky Zr(HPO 4 ) 2 , to obtain a solid content of 30% filter cake 1020kg. The flake Zr(HPO 4 ) 2 The diameter is 0.5 μm, and the aspect ratio is 8:1.

[0024] With flake Zr(HPO 4 ) 2 As a seed crystal, 30kg flake Zr(HPO 4 ) 2 The filter cake is added to 5 tons of 10% Ca(OH) 2 In the slurry, CO containing 10% volume concentration was introduced 2 The gas carbonization, the temperature during carbonization is 50 ℃, carbonization finishes when carbonization is 7.0 to pH, the flaky light calcium slurry is filtered to obtain solid content 60.0% flaky light calcium filter cake 790kg. Observed by scanning electron microscope, the ...

Embodiment 2

[0026] will be 1m 3 2.0mol / L Zr(SO 4 ) 2 4H 2 O aqueous solution with 1m 3 The aqueous solution of potassium dihydrogen phosphate of 2.0mol / L reacts and prepares Zr(HPO 4 ) 2 Gel slurry, Zr(HPO 4 ) 2 The gel slurry is placed in a 3 m tank with a reflux condenser 3 Reactor, then heated to boiling, boiled and refluxed for 10 hours to obtain flake Zr (HPO 4 ) 2 , filter and wash flake Zr(HPO 4 ) 2 , to obtain a solid content of 40% filter cake 1320kg. The flake Zr(HPO 4 ) 2 The diameter is 0.8 μm, and the aspect ratio is 10:1.

[0027] With flake Zr(HPO 4 ) 2 As a seed crystal, 125kg flake Zr(HPO 4 ) 2 The filter cake is added to 5 tons of 20% Ca(OH) 2 In the slurry, pass through a volume concentration of 22% CO 2 The gas carbonization, the temperature during carbonization is 70 ℃, carbonization is finished when carbonization is 7.1 to pH, the flaky light calcium slurry is filtered to obtain solid content 58.0% flaky light calcium filter cake 1650kg. Obser...

Embodiment 3

[0029] will be 1m 3 1.0mol / L ZrOCl 2 8H 2 O aqueous solution with 1m 3 1.0mol / L ammonium dihydrogen phosphate aqueous solution reaction is prepared to obtain Zr(HPO 4 ) 2 Gel slurry, Zr(HPO 4 ) 2 The gel slurry is placed in a 3 m tank with a reflux condenser 3 Reactor, then heated to boiling, boiled and refluxed for 20 hours to obtain flake Zr (HPO 4 ) 2 , filter and wash flake Zr(HPO 4 ) 2 , to obtain a solid content of 38% filter cake 710kg. The flake Zr(HPO 4 ) 2 The diameter is 0.4 μm, and the aspect ratio is 7:1.

[0030] With flake Zr(HPO 4 ) 2 As a seed crystal, 21kg flake Zr(HPO 4 ) 2 The filter cake is added to 10 tons of 2% Ca(OH) 2 slurry, fed with 100% CO 2 The gas carbonization, the temperature during carbonization is 90 ℃, carbonization is finished when carbonization is 6.9 to pH, the flaky light calcium slurry is filtered to obtain solid content 61.0% flaky light calcium filter cake 430kg. Observed by scanning electron microscope, the flak...

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Abstract

The present invention discloses flake light calcium carbonate and its preparation process and application. Flake light calcium carbonate is produced through adding flake Zr(HPO4)2 into 2-20 wt% concentration Ca(OH)2 slurry with the Zr(HPO4)2 adding amount being 0.5-5 wt% of Ca(OH)2; and introducing gas containing CO2 to carbonize at the temperature of 10-90 deg.c and CO2 gas concentration of 10-100 vol% to pH 6.5-7.5 to obtain flake light calcium carbonate. Thus produced flake light calcium carbonate is suitable for use as the paint to make paper with excellent brightness, smoothness, opacity and printing adapatability.

Description

technical field [0001] The invention relates to a flaky light calcium carbonate and a preparation method thereof, in particular to a flaky light calcium carbonate which can be used for papermaking coatings and a preparation method thereof. Background technique [0002] Calcium carbonate is an important inorganic chemical product, often used as a filler, widely used in rubber, plastics, coatings, papermaking and printing inks. Flake calcium carbonate is mainly used for paper coating, which can increase the smoothness and flatness of paper, and is an ideal substitute for kaolin for papermaking. [0003] Ordinary calcium carbonate usually uses limestone as raw material and is calcined to produce quicklime. Then the quicklime is digested with water and absorbs carbon dioxide for carbonization. Finally, it is dehydrated and dried to obtain the product. [0004] The preparation method of flaky calcium carbonate is mainly divided into two-step method and one-step method. The two-...

Claims

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Application Information

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IPC IPC(8): C01F11/18D21H19/00D21H21/00
Inventor 施晓旦王彦华
Owner SHANGHAI DONGSHENG NEW MATERIALS