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Preparation method of nano-composite ultrafine heavy calcium carbonate

A heavy calcium carbonate, nano-composite technology, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, nanotechnology, etc., can solve the problems of poor binding force, can not be used as functional materials, low viscosity, etc., to achieve large BET, flow And the effect of good extrudability and uniform particle size distribution

Active Publication Date: 2018-02-16
SHANXI XINTAI HENGXIN NANO MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heavy calcium products are widely used in industries such as rubber, plastics, papermaking, coatings, inks, and daily chemicals due to their wide range of sources, low production costs, and low prices. They have the advantages of high whiteness, low oil absorption, and good dispersion in applications. Due to its low viscosity, no thixotropy, and poor binding force with organic substances, it can only be used as a filling material and cannot be used as a functional material.

Method used

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  • Preparation method of nano-composite ultrafine heavy calcium carbonate

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of nanocomposite superfine ground calcium carbonate, comprising the steps of:

[0028] (1) Take light-burned and medium-burned calcium oxide to remove impurities and digest it to obtain Ca(OH) with a concentration of 30% and an activity of 40s 2 Suspension, standing and aging for 72h, separating and removing impurities, and finally obtaining Ca(OH) with a concentration of 5%. 2 seminal plasma suspension and indigestible limestone nuclei;

[0029] (2) Coarsely grind the limestone core first, then add grinding and dispersing agent, wet grind the limestone core to become ultrafine heavy calcium slurry with d95≤2μm, the crystal shape is spherical or quasi-spherical, and the obtained ultrafine heavy calcium slurry Dilute the material to a concentration of 10%; the grinding dispersant is a mixture of polycarboxylate sodium salt neutral dispersant and polycarboxylate sodium hydrochloric acid dispersant in a mass ratio of 1:1, and the amount added is based...

Embodiment 2

[0036] A preparation method of nanocomposite superfine ground calcium carbonate, comprising the steps of:

[0037] (1) Take calcium oxide to remove impurities and digest it to obtain Ca(OH) with a concentration of 20% and an activity of 50s 2 Suspension, standing and aging for 46h, separating and removing impurities, and finally obtaining Ca(OH) with a concentration of 8%. 2 seminal plasma suspension and indigestible limestone nuclei;

[0038] (2) Coarsely grind the limestone core first, then add grinding and dispersing agent, wet grind the limestone core to become ultrafine heavy calcium slurry with d95≤2μm, the crystal shape is spherical or quasi-spherical, and the obtained ultrafine heavy calcium slurry Dilute the material to a concentration of 15%; the grinding dispersant is a mixture of polycarboxylate sodium salt neutral dispersant and polycarboxylate sodium hydrochloric acid dispersant in a mass ratio of 1:1, and the amount added is based on the ultrafine weight Add 1...

Embodiment 3

[0045] A preparation method of nanocomposite superfine ground calcium carbonate, comprising the steps of:

[0046] (1) Take calcium oxide to remove impurities and digest it to obtain Ca(OH) with a concentration of 25% and an activity of 30s 2 Suspension, standing and aging for 16h, separating and removing impurities, and finally obtaining Ca(OH) with a concentration of 6%. 2 seminal plasma suspension and indigestible limestone nuclei;

[0047] (2) Coarsely grind the limestone core first, then add grinding and dispersing agent, wet grind the limestone core to become ultrafine heavy calcium slurry with d95≤2μm, the crystal shape is spherical or quasi-spherical, and the obtained ultrafine heavy calcium slurry The material is diluted to a concentration of 13%; the grinding dispersant is a mixture of polycarboxylate sodium salt neutral dispersant and polycarboxylate sodium hydrochloric acid dispersant in a mass ratio of 1:1, and the amount of addition is based on ultrafine weight ...

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Abstract

The invention relates to a preparation method of nano-composite ultrafine heavy calcium carbonate. The problems that the oil absorbing quantity is high, the water-absorbing property is high, the flowability is low and the extrudability is low when nanometer calcium carbonate is applied in other fields are solved. According to the process, ultrafine wet-grinding calcium triple superphosphate servesas a basic core, the advantages of a tandem supergravity reactor are utilized, and the nano-composite ultrafine heavy calcium carbonate is prepared; meanwhile, supercritical CO2 fluid low-temperaturedrying is adopted, so nanoparticles adsorbed on the surface of the ultrafine heavy calcium carbonate are not agglomerated or coagulated. The ultrafine heavy calcium carbonate prepared with the methodis small in particle size, large in BET, high in viscosity, high in thixotropy, little in agglomeration, uniform in particle size distribution and easy to disperse, and has small hydrophilic oil-absorbing amount, high flowability and high extrudability during application.

Description

technical field [0001] The invention relates to the technical field of nano calcium carbonate preparation, in particular to a preparation method of nano composite ultrafine ground calcium carbonate. Background technique [0002] Nano-calcium carbonate refers to ultra-fine calcium carbonate with a particle size of 1-100nm. Due to its small size, the crystal structure and surface electronic structure of nano-calcium carbonate have changed, and it has small size effects, quantum size effects, and surface effects. It has the advantages of high viscosity, good thixotropy, large contact area with organic matter, and good compatibility. The disadvantages are small size, large specific surface area, difficult dispersion in application, and large oil absorption. Although there are various bonuses Powder and wet and dry modification, but irreversible secondary agglomeration inevitably occurs during the carbonization and drying process, which greatly reduces its application performance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18C09C1/02C09C3/08C08K3/26C09J11/04B82Y30/00
CPCB82Y30/00C01F11/181C01F11/183C01P2004/32C01P2004/61C01P2006/12C01P2006/19C08K3/26C08K2003/265C09C1/021C09C3/08C09J11/04Y02P20/54
Inventor 吕国章杨芮平李娟娟
Owner SHANXI XINTAI HENGXIN NANO MATERIALS TECH CO LTD
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