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Light granular calcium oxide material and preparation method thereof

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

Active Publication Date: 2016-12-07
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 methods for preparing calcium oxide particles are not only high in cost and energy consumption, but also complicated in process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A light-weight granular calcium oxide material and a preparation method thereof. First place the calcium hydroxide powder in the barrel of the granulation equipment, and add water accounting for 10-20wt% of the calcium hydroxide powder to the barrel under the condition that the rotor speed is 1000-2000 revolutions per minute, When calcium hydroxide particles begin to form, adjust the rotor speed to 500-800 revolutions per minute, and take out the calcium hydroxide particles when all calcium hydroxide particles are formed.

[0019] During the whole granulation process, the rotor and barrel always keep running in reverse.

[0020] The calcium hydroxide particles are then placed in a heating furnace and kept at 600-900°C for 3-5 hours, and then nitrogen gas is introduced into the furnace at a flow rate of 0.5-2 liters per minute to 35°C to obtain the quality Light granular calcium oxide material.

[0021] The light-weight granular calcium oxide material prepared in this ...

Embodiment 2

[0023] A light-weight granular calcium oxide material and a preparation method thereof. First place the calcium hydroxide powder in the barrel of the granulation equipment, and add water accounting for 20-30 wt% of the calcium hydroxide powder to the barrel under the condition that the rotor speed is 2000-3000 revolutions per minute, When calcium hydroxide particles begin to form, adjust the rotor speed to 800-1000 rpm, and take out the calcium hydroxide particles when all calcium hydroxide particles are formed.

[0024] During the whole granulation process, the rotor and barrel always keep running in reverse.

[0025] The calcium hydroxide particles are then placed in a heating furnace and kept at 900-1000°C for 1-3 hours, and then argon gas is introduced into the furnace at a flow rate of 2-4 liters per minute to 35°C to obtain Lightweight granular calcium oxide material.

[0026] The light-weight granular calcium oxide material prepared in this example is tested: CaO cont...

Embodiment 3

[0028] A light-weight granular calcium oxide material and a preparation method thereof. First place the calcium hydroxide powder in the barrel of the granulation equipment, and add water accounting for 20-30 wt% of the calcium hydroxide powder to the barrel under the condition that the rotor speed is 2000-3000 revolutions per minute, Start granulation. When calcium hydroxide particles start to form, adjust the rotor speed to 800-1000 rpm. When all calcium hydroxide particles are formed, take out the calcium hydroxide particles.

[0029] During the whole granulation process, the rotor and barrel always keep running in reverse.

[0030] The calcium hydroxide particles are then placed in a heating furnace and kept at 1000-1300°C for 1-3 hours, and then nitrogen gas is introduced into the furnace at a flow rate of 4-5 liters per minute to 35°C to obtain the quality Light granular calcium oxide material.

[0031] The light-weight granular calcium oxide material prepared in this e...

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Abstract

The invention relates to a light granular calcium oxide material and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps: firstly, putting calcium hydroxide powder into a bucket of a pelletizer; adding water which accounts for 10-30wt% of the calcium hydroxide powder under the condition that the rotation speed of a rotor is 1000-3000rpm; adjusting the rotation speed of the rotor to be 500-1000rpm, and after calcium hydroxide granules are formed, discharging the calcium hydroxide granules; putting the calcium hydroxide granules into a heating furnace, keeping the temperature for 1-5 hours at 600-1300 DEG C, and introducing nitrogen or argon into the furnace at a flowing speed of 0.5-5 liters per minute till the temperature is 35 DEG C, thereby obtaining the light granular calcium oxide material. The preparation method has the characteristics of being simple in process, low in cost and low in energy consumption; the prepared granular calcium oxide material is high in use temperature, stable in high-temperature property, low in volume density, light in weight and good in thermal insulation.

Description

technical field [0001] The invention belongs to the technical field of calcium oxide materials. In particular, it relates to a light-weight granular calcium oxide material 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 calcite (mainly composed of CaO) is 6 degrees, and the average linear expansion is 0~1700°C The coefficient is 13.8×10-6 / °C, the thermal conductivity at 1000°C is 7.71 W / (m·K), the resistivity at 930°C is 4.175×106 Ω·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 i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/04
CPCC01F11/04C01P2006/80
Inventor 魏耀武张涛余辉韩兵强李楠
Owner WUHAN UNIV OF SCI & TECH
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