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Anti-hydration calcium oxide material and preparation method thereof

A calcium oxide and hydration-resistant technology, applied in the field of calcium oxide materials, can solve the problems of cumbersome process, environmental protection problems, harmful asphalt environment and human body, difficulty in adapting to high-purity melt smelting, etc., to achieve simple process and improve hydration resistance. , The effect of stable high temperature performance

Inactive Publication Date: 2018-08-10
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In short, the existing methods of preparing calcium oxide clinker and materials are not only cumbersome in process (requires crushing), but also have environmental protection problems (asphalt is harmful to the environment and human body), and the products are difficult to adapt to the smelting of high-purity melts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A hydration-resistant calcium oxide material and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0032] Step 1. Use calcium hydroxide fine powder as raw material, add 0.5~1wt% water of the raw material, mix, press and shape, dry at 130~150°C for 12~18 hours, and cool naturally to obtain the dried oxidized Calcium body.

[0033] Step 2: heat-treat the dried calcium oxide body at 1400° C. to 1600° C. for 4 to 6 hours, and cool naturally to obtain the heat-treated calcium oxide body.

[0034] Step 3, coating the aluminate solution on the surface of the calcia body after the heat treatment, and standing at room temperature for 6 to 8 hours to obtain a calcium oxide body coated with a layer of aluminate; Ester solution is coated on the surface of the calcium oxide body coated with one layer of aluminate, and left to stand at room temperature for 10-12 hours to obtain a calcium oxide body coated with two layers of alumin...

Embodiment 2

[0038] A hydration-resistant calcium oxide material and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0039] Step 1. Use calcium hydroxide fine powder as raw material, add 1~2wt% water of the raw material, mix, press and shape, dry at 150~200°C for 8~12 hours, and cool naturally to obtain the dried oxidized Calcium body.

[0040] Step 2, heat-treating the dried calcium oxide body at 1600° C. to 1800° C. for 1 to 3 hours, and cooling naturally to obtain the heat-treated calcium oxide body.

[0041] Step 3, coating the aluminate solution on the surface of the calcia body after the heat treatment, and standing at room temperature for 8 to 10 hours to obtain a calcium oxide body coated with a layer of aluminate; The acid ester solution is coated on the surface of the calcium oxide body coated with one layer of aluminate, and left to stand at room temperature for ~14 hours to obtain a calcium oxide body coated with two layer...

Embodiment 3

[0045] A hydration-resistant calcium oxide material and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0046] Step 1. Use calcium hydroxide fine powder as raw material, add 2~4wt% water of the raw material, mix, press and shape, dry at 110~130°C for 18~24 hours, and cool naturally to obtain the dried oxidized Calcium body.

[0047] Step 2, heat-treating the dried calcium oxide body at 1500° C. to 1700° C. for 3 to 4 hours, and cooling naturally to obtain the heat-treated calcium oxide body.

[0048] Step 3, coating the aluminate solution on the surface of the calcia body after the heat treatment, and standing at room temperature for 7 to 9 hours to obtain a calcium oxide body coated with a layer of aluminate; The ester solution is coated on the surface of the calcium oxide body coated with one layer of aluminate, and left to stand at room temperature for 11 to 12 hours to obtain a calcium oxide body coated with two layer...

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Abstract

The invention relates to an anti-hydration calcium oxide material and a preparation method thereof. The anti-hydration calcium oxide material is characterized in that calcium hydroxide fine powder isused as raw materials; water accounting for 0.5 to 4 weight percentage of the raw material is added; mixing, shaping, drying and natural cooling are performed; then, heat treatment is performed for 1to 6 hours under the condition of 1400 to 1800 DEG C; natural cooling is performed; a calcium oxide blank subjected to heat treatment is obtained. An aluminic acid ester solution is covered onto the surface of the calcium oxide blank subjected to heat treatment; still standing is performed for 6 to 10 hours to obtain the calcium oxide blank coated with a layer of aluminic acid ester; then, the aluminic acid ester solution is covered onto the surface of the calcium oxide blank coated with a layer of aluminic acid ester; still standing is performed for 10 to 14 hours; finally, heat treatment isperformed for 1 to 5 hours under the condition of 1200 to 1600 DEG C; natural cooling is performed; the anti-hydration calcium oxide material is obtained. The process is simple; the prepared product has high utilization temperature, stable high-temperature performance, good anti-hydration performance and high-temperature melt purification capability, and is suitable for being used as a high-temperature material for melting high-purity melt.

Description

technical field [0001] The invention belongs to the technical field of calcium oxide materials. In particular, it relates to a hydration-resistant calcium oxide material and a preparation method thereof. Background technique [0002] Calcium oxide material is a special refractory material made of calcium oxide (calcite) as the main mineral. Calcite (CaO) has a true density of 3.75g / cm3, a melting point of 2570°C, a Mohs hardness of 6 degrees, an average linear expansion coefficient of 13.8×10-6 / °C from 0 to 1700°C, and a thermal conductivity of 1000°C. It 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, which is an alkaline refractory material. Although calcium oxide products have the advantages of good high-temperature performance and strong resistance to alkaline slag erosion, they are highly reactive with water or water vapor, so calcium oxide clinker and calcium oxide products are extremely difficult to preserve in a ...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/057C04B35/622C04B41/87
CPCC04B35/057C04B35/622C04B35/66C04B41/009C04B41/5032C04B41/87C04B2235/77C04B2235/96
Inventor 魏耀武王金虎岳瑞
Owner WUHAN UNIV OF SCI & TECH
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