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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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the anti-hydration performance of calcium oxide particles still needs to be continuously improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 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...

Embodiment 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 ...

Embodiment 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...

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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.

Description

Technical field [0001] The invention belongs to the technical field of calcium oxide materials. In particular, it relates to a passivated calcium oxide particle and a preparation method thereof. Background technique [0002] Calcium oxide products are special refractory materials made with calcium oxide (calcite) as the main mineral (CaO as the main component). 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 smelting. However, calcium oxide raw materials or materials containing free calcium oxide are easily hydrated in the air, and hydration will cause cracking and pulverization of the materials, which severely restricts the promotion and application of calcium oxide raw materials and materials containing free calcium oxide in industry. At the same time, calcium oxide clinker is the m...

Claims

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Application Information

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IPC IPC(8): C01F11/04
CPCC01F11/04C01P2006/80
Inventor 魏耀武李炳蓉肖俊李刘少坤
Owner WUHAN UNIV OF SCI & TECH
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