A method for preparing hollow calcium oxide powder

A technology of hollow calcium oxide and pollen, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., to achieve thermal decomposition, control surface compactness, and good monodispersity

Active Publication Date: 2019-08-06
重庆一帆钙业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is little in the prior art how to use natural natural materials as templates to prepare calcium oxide with a hollow structure, and to control the surface density of calcium oxide materials and the monodispersity of particles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) crushing limestone, sieving, adding deionized water for digestion, carrying out primary aging, obtaining primary aging slurry, and the concentration of calcium in primary aging slurry is 0.06mol / L;

[0025] 2) adding anhydrous ethanol to the ammonium bicarbonate aqueous solution to obtain an ammonium bicarbonate alcohol aqueous solution; wherein, the consumption of the anhydrous ethanol is 5-8% of the volume of the ammonium bicarbonate aqueous solution.

[0026] 3) Under stirring at 3000rpm, at the same speed of 60L / h, the primary aging slurry and the ammonium bicarbonate alcohol aqueous solution were rapidly sprayed into the reactor to generate white precipitate, the reaction temperature was 20-30°C, and the reaction was performed for 2min; quickly add a large amount of deionized water The sediment is diluted, and the slurry is subjected to secondary aging to obtain secondary aging slurry;

[0027] 4) collecting forget-me-not grass pollen, adding it to absolute etha...

Embodiment 2

[0032] 1) crushing limestone, sieving, adding deionized water for digestion, carrying out primary aging, obtaining primary aging slurry, and the concentration of calcium in primary aging slurry is 0.06mol / L;

[0033] 2) adding anhydrous ethanol to the ammonium bicarbonate aqueous solution to obtain an ammonium bicarbonate alcohol aqueous solution; wherein, the consumption of the anhydrous ethanol is 5-8% of the volume of the ammonium bicarbonate aqueous solution.

[0034] 3) Under stirring at 3000rpm, at the same speed of 60L / h, the primary aging slurry and the aqueous ammonium bicarbonate alcohol solution were rapidly sprayed into the reactor to generate a white precipitate, the reaction temperature was 20-30°C, and the reaction was performed for 1min; quickly add a large amount of deionized water The sediment is diluted, and the slurry is subjected to secondary aging to obtain secondary aging slurry;

[0035] 4) collecting forget-me-not grass pollen, adding it to absolute et...

Embodiment 3

[0040] 1) crushing limestone, sieving, adding deionized water for digestion, carrying out primary aging, obtaining primary aging slurry, and the concentration of calcium in primary aging slurry is 0.06mol / L;

[0041] 2) adding anhydrous ethanol to the ammonium bicarbonate aqueous solution to obtain an ammonium bicarbonate alcohol aqueous solution; wherein, the consumption of the anhydrous ethanol is 5-8% of the volume of the ammonium bicarbonate aqueous solution.

[0042] 3) Under stirring at 3000rpm, at the same speed of 60L / h, the primary aging slurry and ammonium bicarbonate alcohol aqueous solution were rapidly injected into the reactor to generate white precipitate, the reaction temperature was 20-30°C, and the reaction was performed for 4min; quickly add a large amount of deionized water The sediment is diluted, and the slurry is subjected to secondary aging to obtain secondary aging slurry;

[0043] 4) collecting forget-me-not grass pollen, adding it to absolute ethanol...

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Abstract

The invention relates to a method for preparing hollow calcium oxide powder. According to the method, super-fine calcium carbonate is prepared by virtue of a rapid settling method, and the particle sizes of particles are controlled by controlling the concentration of a reactant, a solvent, the reaction time, a jetting speed and a stirring speed. By taking surface activated pollen as a core, the surfaces of pollen particles are uniformly coated with super-fine calcium carbonate particles in a high-density manner; by controlling the thermal treatment temperature and time, the pollen particles are removed, and the super-fine calcium carbonate particles are thermally decomposed and converted into calcium oxide; and meanwhile, by controlling the fusion among the particles, the surfaces of hollow calcium oxide particles are dense and smooth.

Description

technical field [0001] The invention belongs to the field of preparation of oxidizing materials, in particular to a method for preparing hollow calcium oxide powder. Background technique [0002] Calcium oxide is widely used in fillers, refractories, building materials, metallurgical fluxes, cement accelerators, and fluorescent powder fluxes. The preparation method of calcium oxide includes limestone calcination method, pure nitric acid dissolving marble, calcium carbonate calcination method, etc. However, there is little in the prior art how to use natural materials in nature as templates to prepare calcium oxide with a hollow structure, and to control the surface density of the calcium oxide material and the monodispersity of the particles. SUMMARY OF THE INVENTION [0003] The technical scheme of the present invention is to overcome the deficiencies of the prior art, and proposes a method for preparing monodisperse, dense and smooth hollow calcium oxide micron powder. ...

Claims

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Application Information

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IPC IPC(8): C01F11/06
CPCC01F11/06C01P2004/34
Inventor 唐洁净
Owner 重庆一帆钙业有限公司
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