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A kind of method for preparing superfine calcium carbonate nanopowder

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

Active Publication Date: 2020-08-28
南阳中瑞微粉科技有限公司
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  • 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

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  • A kind of method for preparing superfine calcium carbonate nanopowder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Limestone is pulverized, sieved, digested by adding deionized water, and aged once to obtain an aged slurry. The concentration of calcium in the aged slurry is 0.05mol / 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 5-8% 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 dilute the precipitate, and the slurry is subject...

Embodiment 2

[0031] 1) The limestone is pulverized, sieved, digested by adding deionized water, and subjected to primary aging to obtain a primary aging slurry. The concentration of calcium in the primary aging slurry is 0.05mol / 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 5-8% 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 dilute th...

Embodiment 3

[0038] 1) The limestone is pulverized, sieved, digested by adding deionized water, and subjected to primary aging to obtain a primary aging slurry. The concentration of calcium in the primary aging slurry is 0.05mol / 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 5-8% 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 to dil...

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Abstract

The invention discloses a method for preparing superfine calcium carbonate nanometer powder. According to the method, superfine calcium carbonate is prepared through a rapid precipitation method, particle diameters are controlled through the controlling of reactant concentration, dissolvent, reaction time, spraying speed and stirring speed, and precipitate is diluted by rapidly adding a large amount of deionized water after reaction, so that the probability of collision and combination of nanometer particles is reduced, and the fact that the nanometer particles have excellent monodispersity isguaranteed. The method adopts secondary ageing and secondary carbonization technologies, glucose and serine are added during secondary carbonization, and the pH value of a calcium carbonate product is reduced by controlling the dosages of glucose and serine.

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

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01F11/181C01F11/183C01F11/185C01P2004/64
Inventor 唐洁净
Owner 南阳中瑞微粉科技有限公司
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