Calcium oxide particle and preparation method thereof

A technology of calcium oxide and calcium hydroxide, which is applied in the field of calcium oxide materials, can solve the problems of high production cost, complex process, and high energy consumption, and achieve the effects of low cost, simple process, and low preparation cost

Inactive Publication Date: 2018-11-30
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the existing preparation method of calcium oxide particles not only has high cost and high energy consumption, but also has complex processes
The applicant and his team took the lead in proposing the method of preparing calcium oxide particles by granulation (ZL201610535065.5 and ZL201610535082.9) and applied them in practice, and achieved good results. However, the above two patented technologies mainly use calcium hydroxide As a raw material, the production cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A calcium oxide particle and a preparation method thereof. The preparation method described in this embodiment is: first mix 20-40wt% limestone powder and 60-80wt% calcium hydroxide powder to obtain the mixed powder; then mix the mixed powder with the Put 10-20wt% water of the powder in the material barrel of the granulation equipment, start the granulation equipment, and start granulation under the condition that the rotor speed is 500-1000 revolutions per minute; the mixed powder in the material barrel After all the particles are converted into particles, the particles are taken out; then the particles are placed in a heating furnace and kept at 1700-1800° C. for 1-3 hours. Cool to obtain calcium oxide particles.

[0022] The particle diameter of the calcium oxide particles is 0.1-4mm.

[0023] The calcium oxide particles prepared in this example are tested: the CaO content is 95-97wt%, and the bulk density is 2.9-3.2g / cm 3 .

Embodiment 2

[0025] A calcium oxide particle and a preparation method thereof. The preparation method described in this embodiment is: first mix 40-60 wt% of limestone powder and 40-60 wt% of calcium hydroxide powder to obtain the mixed powder. Then put the mixed powder and water accounting for 20-30wt% of the mixed powder in the material barrel of the granulation equipment, start the granulation equipment, and start to make the granulation equipment under the condition that the rotor speed is 1000-1500 revolutions per minute. Granules; after all the mixed powder in the material barrel is converted into granules, take out the granules; then put the granules in a heating furnace, keep them warm for 3-5 hours at 1600-1700°C, and cool to obtain Calcium oxide particles.

[0026] The particle diameter of the calcium oxide particles is 2-6mm.

[0027] The calcium oxide particles prepared in this example are tested: the CaO content is 96-97.5wt%, and the bulk density is 2.8-3.1g / cm 3 .

Embodiment 3

[0029] A calcium oxide particle and a preparation method thereof. The preparation method described in this embodiment is: first mix 60-95wt% limestone powder and 5-40wt% calcium hydroxide powder to obtain the mixed powder; then mix the mixed powder with the Put 20-30wt% water of the powder in the material barrel of the granulation equipment, start the granulation equipment, and start granulation under the condition that the rotor speed is 1500-2000 revolutions per minute, and wait for the mixed powder in the material barrel After all the particles are converted into particles, the particles are taken out; then the particles are placed in a heating furnace, kept at 1500-1600° C. for 3-5 hours, and cooled to obtain calcium oxide particles.

[0030] The particle diameter of the calcium oxide particles is 4-8mm.

[0031] The calcium oxide particles prepared in this example are tested: the CaO content is 96.5-98wt%, and the bulk density is 2.7-3.0g / cm 3 .

[0032] Compared with ...

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Abstract

The invention relates to a calcium oxide particle and a preparation method thereof. The preparation method comprises the following steps: mixing 20-95 wt% of limestone powder with 5-80 wt% of calciumoxide powder to obtain a mixed powder; adding the mixed powder and water accounting for 10-30% of the weight of the mixed powder into a material barrel for a granulating device, starting the granulating device, performing granulation at a rotating speed of a rotor of 500-2000 rpm, and taking out obtained particles after the mixed powder in the material barrel are completely converted into the particles; and adding the particles into a heating furnace, performing heat insulation at 1500-1800 DEG C for 1-5 h, and cooling the particles to prepare the calcium oxide particle. The particle size of the calcium oxide particle is 0.1-8 mm, and the content of CaO in the calcium oxide particle is equal to or more than 95 wt%. The preparation method has the advantages of simple process and low preparation cost, and the prepared calcium oxide particle has the characteristics of high use temperature, stable high temperature performances and good hydration resistance, and is an optically selected rawmaterial for calcium oxide ceramic, refractive materials and other high-grade materials.

Description

technical field [0001] The invention belongs to the technical field of calcium oxide materials. In particular, it relates to a calcium oxide particle and a preparation method thereof. Background technique [0002] Calcium oxide products are special refractory materials made of calcium oxide (calcite) as the main mineral (CaO as the main component). Calcite (CaO) has a true density of 3.75g / cm3 and a melting point of 2570°C, which is an alkaline refractory material; the Mohs hardness of calcium oxide products is 6 degrees, and the average linear expansion coefficient of 0-1700°C is 13.8×10- 6 / °C, the thermal conductivity at 1000°C is 7.71W / (m·K), the resistivity at 930°C is 4.175×106Ω·cm, and the resistivity at 1460°C is 91Ω·cm. Calcium oxide products have the advantages of good high-temperature performance, strong resistance to alkaline slag erosion and purification of high-temperature melts, and have been widely used in metallurgical industries such as precious metal smel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/057C04B35/66C04B2/10
CPCC04B2/10C04B35/057C04B35/66
Inventor 魏耀武李炳蓉张涛
Owner WUHAN UNIV OF SCI & TECH
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