Passivated calcium oxide particle and preparation method thereof

A technology of calcium oxide and calcium hydroxide, applied in the field of calcium oxide materials, to achieve the effects of simple production process, convenient storage and production, and good hydration resistance

Inactive Publication Date: 2019-01-11

WUHAN UNIV OF SCI & TECH

8 Cites 4 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, the anti-hydration performance of calcium ox...

Method used

2) this specific embodiment is in high temperature treatment process, and the coupling agent of calcium hydroxide particle surface layer and calcium oxide react, have promoted the sintering of calcium hydroxide particle surface and formed new phase and wrapped in final product oxidation On the surface of calcium particles, the new phase is a substance that is not easily hydrated, such as calcium zirconate, calcium aluminate, and calcium phosphate. The sintered new phase isolates the water vapor in the air from the calcium oxide component in the particles, thus improving the hydrat...

Abstract

The invention relates to a passivated calcium oxide particle and a preparation method thereof. The preparation method comprises the following steps: adding calcium hydroxide powder and water accounting for 10-30% of the weight of the calcium hydroxide powder into a material barrel for a granulating device, performing granulation at a rotating speed of a rotor of 200-2000 rpm to convert the calciumhydroxide powder in the material barrel into particles, and spraying a coupling agent solution accounting for 0.1-6% of the weight of the calcium hydroxide powder at the rotating speed of the rotor of 200-2000 rpm in order to obtain calcium hydroxide particles; and drying the calcium hydroxide particles at 50-110 DEG C for 12-24 h, adding the dried particles into a heating furnace, performing heat insulation at 1500-1700 DEG C for 1-5 h, and cooling the particles to prepare the passivated calcium oxide particle. The preparation method is simple, and the prepared passivated calcium oxide particle has a good hydration resistance, and can be used as a raw material for preparing calcium oxide ceramic, refractive materials and other high-grade materials.

Application Domain

Calcium/strontium/barium oxides/hydroxides

Technology Topic

Calcium hydroxideHeating furnace +4

Examples

Experimental program(5)

Example Embodiment

[0018] Example 1

[0019] A passivated calcium oxide particle and a preparation method thereof. The preparation method described in this embodiment is: placing calcium hydroxide powder and 10-20 wt% of the calcium hydroxide powder in the bucket of the granulation equipment, and the rotor speed is 1700-2000 per minute. The granulation is started under the condition of rotation. After the calcium hydroxide powder in the barrel is converted into particles, the rotor speed is 200-800 rotations per minute, and 0.5~0.5% of the calcium hydroxide powder is sprayed. 2wt% coupling agent solution to obtain calcium hydroxide particles; the calcium hydroxide particles are dried at 90-110°C for 12-16 hours, and then placed in a heating furnace, and kept at 1500-1600°C After cooling for 3 to 5 hours, passivated calcium oxide particles are obtained.

[0020] The coupling agent solution is a titanate coupling agent solution.

[0021] The passivated calcium oxide particles prepared in this embodiment are tested: the particle size of the calcium oxide particles is 0.1-3mm, the CaO content is 94-96wt%, and the volume density is 2.80-3.0g/cm 3; Under 50 ℃, 90% humidity conditions, keep for 10 hours, after drying at 110 ℃, the hydration weight gain rate of calcium oxide particles is 0.8-1%.

Example Embodiment

[0022] Example 2

[0023] A passivated calcium oxide particle and a preparation method thereof. The preparation method described in this embodiment is: placing calcium hydroxide powder and 20-30 wt% of the calcium hydroxide powder in the bucket of the granulation equipment, and the rotor speed is 1400-1700 per minute. The granulation is started under the condition of rotation. After the calcium hydroxide powder in the bucket is converted into particles, the rotor rotates at 800 to 1,400 revolutions per minute. 4wt% coupling agent solution to obtain calcium hydroxide particles; the calcium hydroxide particles are dried at 80-100°C for 16-20 hours, and then placed in a heating furnace, and kept at 1600-1700°C After cooling for 1 to 3 hours, passivated calcium oxide particles are obtained.

[0024] The coupling agent solution is an aluminate coupling agent solution.

[0025] The passivated calcium oxide particles prepared in this embodiment are tested: the particle size of the calcium oxide particles is 2-5mm, the CaO content is 95-97wt%, and the volume density is 2.9-3.1g/cm 3; Under 50 ℃, 90% humidity conditions, keep for 10 hours, after drying at 110 ℃, the hydration weight gain rate of calcium oxide particles is 0.7-0.9%.

Example Embodiment

[0026] Example 3

[0027] A passivated calcium oxide particle and a preparation method thereof. The preparation method described in this embodiment is: placing calcium hydroxide powder and 10-20wt% of the calcium hydroxide powder with water in the bucket of the granulation equipment, and the rotor speed is 900-1400 per minute. The granulation is started under the condition of rotation. After the calcium hydroxide powder in the barrel is converted into particles, the rotor speed is 1400 to 1700 revolutions per minute. 6wt% of the coupling agent solution to obtain calcium hydroxide particles; the calcium hydroxide particles are dried at 50-70°C for 20-24 hours, and then placed in a heating furnace and kept warm at 1500-1600°C After cooling for 1 to 3 hours, passivated calcium oxide particles are obtained.

[0028] The coupling agent solution is a zirconate ester coupling agent solution.

[0029] The passivated calcium oxide particles prepared in this example have been tested: the particle size of the calcium oxide particles is 5-8mm, the CaO content is 96-98wt%, and the volume density is 3.0-3.2g/cm. 3. Under the conditions of 50°C and 90% humidity, keeping for 10 hours and drying at 110°C, the hydration weight gain rate of the calcium oxide particles is 0.5-0.8%.

PUM

Property	Measurement	Unit
Particle size	0.1 ~ 3.0	mm
Bulk density	2.8 ~ 3.0	g/cm³
Particle size	2.0 ~ 5.0	mm

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Simple production process
Improves hydration resistance

Passivated calcium oxide particle and preparation method thereof

A technology of calcium oxide and calcium hydroxide, applied in the field of calcium oxide materials, to achieve the effects of simple production process, convenient storage and production, and good hydration resistance

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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