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Method for preparing length and diameter controllable fibrous light calcium carbonate

A light calcium carbonate, fibrous technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problem of uncontrollable particle size, and achieve the effects of environmental protection, reducing tree felling, and reducing consumption

Active Publication Date: 2007-03-28
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in the present invention is to disclose a preparation method of fibrous light calcium carbonate with controllable length and diameter, so as to overcome the defect that the particle size cannot be controlled in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Ca(OH) with a weight concentration of 12% 2 100kg of water slurry is diluted with 900kg of water to be 1.2% Ca(OH) by weight 2 Water slurry, add 36kgMgCl to it 2 6H 2 O, stir to make it dissolve completely, then add 60g of lactic acid, and then pass through the gas containing 25% CO 2 The carbonization of the gas, the temperature of the system in the carbonization process is controlled at 35 ° C, and the carbonization is stopped when the carbonization reaches a pH of 7.3, filtered and washed to obtain 28 kg of a calcium carbonate filter cake with a solid content of 50%. The particle size was 1.6 μm observed with a scanning electron microscope.

[0017] 1.5 tons of Ca(OH) with a weight concentration of 10% 2 In the slurry, add 2.5kg of the above-mentioned polygonal granular calcium carbonate filter cake, then add 25g boric acid, then pass through the filter cake containing 20% ​​CO 2 Gas carbonization, the temperature of the system during the carbonization process ...

Embodiment 2

[0019] Ca(OH) with a weight concentration of 12% 2 Slurry 100kg adds water 300kg and is diluted to the Ca(OH) that weight concentration is 3.0% 2 Slurry, add 60kgMgCl wherein 2 6H 2 O, stir to make it dissolve completely, then add 600g lactic acid, and then pass through the gas containing 21% CO 2 The carbonization of the gas, the temperature of the system in the carbonization process is controlled at 15 ° C, and the carbonization is stopped when the carbonization reaches a pH of 7.0. Filter and wash with a plate and frame filter press to obtain 31 kg of a calcium carbonate filter cake with a solid content of 48%. The particle size is 0.6 μm observed with a scanning electron microscope.

[0020] 1.5 tons of Ca(OH) with a weight concentration of 18% 2 In the slurry, add 0.6kg of the above-mentioned polygonal granular calcium carbonate filter cake, then add 8.1g boric acid, then pass through the mixture containing 21% CO 2 The carbonization of the gas, the temperature of t...

Embodiment 3

[0022] Ca(OH) with a weight concentration of 12% 2 Slurry 500kg adds water 5500kg and is diluted to the Ca(OH) that weight concentration is 1.0% 2 Slurry, add 180kgMgCl wherein 2 6H 2 O, stir to make it dissolve completely, then add 3000g lactic acid, and then pass through the gas containing 23% CO 2 The carbonization of the gas, the temperature of the system in the carbonization process is controlled at 30 ° C, and the carbonization is stopped when the carbonization reaches a pH of 7.2. Filter and wash with a plate and frame filter press to obtain 153 kg of a calcium carbonate filter cake with a solid content of 51%. The particle size was 1.8 μm observed with a scanning electron microscope.

[0023] 1.5 tons of Ca(OH) with a weight concentration of 20% 2 In the slurry, add 15kg of the above-mentioned polygonal granular calcium carbonate filter cake, add 76g boric acid again, pass through then containing volume concentration and be 25% CO 2 The carbonization of the gas, t...

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Abstract

The invention discloses a method for preparing fiber lightweight calcium carbonate with controllable length and diameter, comprising the steps of: (1) adding MgCl26H2O in Ca(OH)2 water slurry and simultaneously adding in lactic acid, charging the gas with the CO2 volumetric concentration of 10-100% and carbonizing, and collecting polygonal granular calcium carbonate crystal seeds in the resultant when pH is 6.5-7.5 ; (2) adding the obtained crystal seeds and crystal surface growth control agent in Ca(OH)2 water slurry, charging the gas with the CO2 volumetric concentration of 10-100% and carbonizing, and obtaining fiber lightweight calcium carbonate when pH is 6.5-7.5, where the fiber length and diameter can be perfectly controlled.

Description

technical field [0001] The invention relates to a preparation method of fibrous light calcium, in particular to a preparation method of fibrous light calcium calcium carbonate which can be used for plastic reinforcement and papermaking filler. Background technique [0002] Calcium carbonate is an important inorganic material and a typical biomineral, widely used in industries such as rubber, plastics, paper, ink, and coatings. A series of parameters of calcium carbonate particles such as crystal shape, structure, particle size, specific surface area, oil absorption value, chemical purity, etc. directly affect its application, the most important of which is the crystal shape and particle size of calcium carbonate particles, and the application of calcium carbonate products with different shapes and particle sizes Fields and functions are different. At present, research on the preparation of ultrafine calcium carbonate products in different forms is a hot spot in this industr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 施晓旦王彦华
Owner SHANGHAI DONGSHENG NEW MATERIALS
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