Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method for preparing superfine calcium carbonate nanopowder with calcite

An ultra-fine calcium carbonate, nano powder technology, applied in the direction of calcium carbonate/strontium/barium, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problem of difficult to obtain nano calcium carbonate, calcium carbonate particle size , the control of pH value is difficult to guarantee and other problems, to achieve the effect of good monodispersity, short cycle and fast reaction

Active Publication Date: 2020-08-28
池州市富华粉体科技有限公司
View PDF18 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the nano-calcium carbonates prepared in the prior art are micron and sub-micron in size, and it is difficult to obtain ultra-small-sized nano-calcium carbonates.
[0003] The method for preparing calcium carbonate in the prior art comprises: intermittent bubbling type carbonization method, intermittent stirring type carbonization method, continuous spray type carbonization method, supergravity reaction crystallization method etc., above-mentioned method all needs to adopt specific equipment, and for calcium carbonate It is difficult to guarantee the control of particle size and pH value

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for preparing superfine calcium carbonate nanopowder with calcite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Pulverize the calcite, sieve, remove impurities, add deionized water for digestion, and perform a primary aging to obtain a primary aging slurry. The concentration of calcium in the primary aging slurry is 0.06mol / L;

[0025] 2) adding dehydrated ethanol to the ammonium bicarbonate aqueous solution to obtain an ammonium bicarbonate alcohol aqueous solution; wherein, the amount of the dehydrated ethanol is 6-8% of the volume of the ammonium bicarbonate aqueous solution.

[0026] 3) Under the agitation of 3000rpm, at the same speed of 60L / h, the primary aging slurry and the ammonium bicarbonate alcoholic aqueous solution are quickly injected into the reactor to form a white precipitate, and the amount of ammonium bicarbonate added is controlled so that the reaction system when the precipitation reaction is terminated The pH value of the solution is 9, the reaction temperature is 20-30°C, and the reaction is 2 minutes; quickly add a large amount of deionized water to dil...

Embodiment 2

[0031] 1) Pulverize the calcite, sieve, remove impurities, add deionized water for digestion, and perform a primary aging to obtain a primary aging slurry. The concentration of calcium in the primary aging slurry is 0.06mol / L;

[0032] 2) adding dehydrated ethanol to the ammonium bicarbonate aqueous solution to obtain an ammonium bicarbonate alcohol aqueous solution; wherein, the amount of the dehydrated ethanol is 6-8% of the volume of the ammonium bicarbonate aqueous solution.

[0033] 3) Under the agitation of 3000rpm, at the same speed of 60L / h, the primary aging slurry and the ammonium bicarbonate alcoholic aqueous solution are quickly injected into the reactor to form a white precipitate, and the amount of ammonium bicarbonate added is controlled so that the reaction system when the precipitation reaction is terminated The pH value of the solution is 9, the reaction temperature is 20-30°C, and the reaction is 1 minute; quickly add a large amount of deionized water to dilu...

Embodiment 3

[0038] 1) Pulverize the calcite, sieve, remove impurities, add deionized water for digestion, and perform a primary aging to obtain a primary aging slurry. The concentration of calcium in the primary aging slurry is 0.06mol / L;

[0039] 2) adding dehydrated ethanol to the ammonium bicarbonate aqueous solution to obtain an ammonium bicarbonate alcohol aqueous solution; wherein, the amount of the dehydrated ethanol is 6-8% of the volume of the ammonium bicarbonate aqueous solution.

[0040] 3) Under the agitation of 3000rpm, at the same speed of 60L / h, the primary aging slurry and the ammonium bicarbonate alcoholic aqueous solution are quickly injected into the reactor to form a white precipitate, and the amount of ammonium bicarbonate added is controlled so that the reaction system when the precipitation reaction is terminated The pH value of the solution is 9, the reaction temperature is 20-30°C, and the reaction is 4 minutes; a large amount of deionized water is quickly added t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention prepares ultrafine calcium carbonate by a rapid precipitation method. The particle size is controlled by controlling the reactant concentration, a solvent, the reaction time, the jet speed and the stirring speed, and a precipitate is diluted by rapidly adding a large volume of deionized water after a reaction, so that the probabilities of collision and bonding between nanoparticles are reduced and good monodispersity of the nanoparticles is guaranteed. A secondary aging technology and a secondary carbonizing technology are adopted, zinc sulfate and phosphoric acid are added during secondary carbonization, and the pH value of a calcium carbonate product is reduced by controlling the using amounts of the zinc sulfate and the phosphoric acid.

Description

technical field [0001] The invention belongs to the field of preparation of calcium carbonate materials, and in particular relates to a method for preparing nanometer calcium carbonate. Background technique [0002] Calcium carbonate is widely used in industries such as rubber, plastics, coatings, papermaking, inks, glue dispensing agents, sealants, etc. It can also be used in industries such as toothpaste, food, medicine, word materials, building materials, and chemical fibers. Nano-calcium carbonate has small particle size and large specific surface area. Compared with ordinary calcium carbonate, it has excellent performance. Nano-calcium carbonate with a particle size of 10-100nm has a reinforcing effect on rubber and plastics; while ultra-fine calcium carbonate with a particle size of 5-20nm has a reinforcing effect comparable to white carbon black. However, most of the nano-calcium carbonates prepared in the prior art are micron and sub-micron sizes, and it is difficul...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18B82Y30/00
Inventor 李弘毅唐洁净
Owner 池州市富华粉体科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com