Titanium coated calcium oxide material and preparation method thereof

A technology of calcium oxide and calcium hydroxide, applied in the field of calcium oxide materials, can solve the problems of limited improvement in hydration resistance and unfavorable environmental protection of asphalt, achieve good hydration resistance, improve hydration resistance, and improve production process simple effect

Inactive Publication Date: 2018-07-10
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] It can be seen that the preparation of calcium oxide materials in the prior art has a limited degree of improvement in the hydration resistance of the material, and the asphalt used in the production process is not conducive to environmental protection.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A titanium-coated calcium oxide material and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0034] Step 1. Use calcium hydroxide fine powder as raw material, add 0.2~2wt% water of the raw material, mix, press and shape, dry at 110~150°C for 15~24 hours, and cool naturally to obtain calcium hydroxide billet body.

[0035] Step 2: Put the calcium hydroxide green body in a container, then place the container in a vacuum device, evacuate to 1-1.5kPa, and hold the pressure for 4-6 minutes.

[0036] Step 3: Inject the titanate solution into the container at a constant speed until the calcium hydroxide body is submerged, and the time for injecting the titanate solution is 3 to 8 minutes; then maintain the pressure at 1 to 1.5kPa for 4~ 6 minutes.

[0037] Step 4, take out the container filled with titanate solution, and let it stand in the air for 20-40 minutes; then take out the calcium hydroxide body immersed in the t...

Embodiment 2

[0041] A titanium-coated calcium oxide material and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0042] Step 1. Use calcium hydroxide fine powder as raw material, add 2~4wt% water of the raw material, mix, press and shape, dry at 150~200°C for 8~15 hours, and cool naturally to obtain calcium hydroxide billet body.

[0043] Step 2: Put the calcium hydroxide green body in a container, then place the container in a vacuum device, evacuate to 1.5-2kPa, and hold the pressure for 4-6 minutes.

[0044] Step 3: Inject the titanate solution into the container at a constant speed until the calcium hydroxide body is submerged, and the time for injecting the titanate solution is 3 to 8 minutes; then keep the pressure at 1.5 to 2kPa for 4 to 6 minute.

[0045] Step 4, take out the container filled with titanate solution, and let it stand in the air for 20-40 minutes; then take out the calcium hydroxide body immersed in the titanat...

Embodiment 3

[0049] A titanium-coated calcium oxide material and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0050] Step 1. Use calcium hydroxide fine powder as raw material, add 1~3wt% water of the raw material, mix, press and shape, dry at 130~180°C for 12~20 hours, and cool naturally to obtain calcium hydroxide billet body.

[0051] Step 2: Put the calcium hydroxide green body in a container, then place the container in a vacuum device, evacuate to 1.2-1.7kPa, and hold the pressure for 4-6 minutes.

[0052]Step 3: Inject the titanate solution into the container at a constant speed until the calcium hydroxide body is submerged, and the time for injecting the titanate solution is 3 to 8 minutes; then maintain the pressure at 1.2 to 1.7 kPa for 4 to 6 minutes.

[0053] Step 4, take out the container filled with titanate solution, and let it stand in the air for 20-40 minutes; then take out the calcium hydroxide body immersed in t...

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Abstract

The invention relates to a titanium coated calcium oxide material and a preparation method thereof. The preparation method has the technical scheme that calcium hydroxide fine powder is used as raw materials; water accounting for 0.2 to 4 weight percent of raw materials is externally added; mixing, formation and drying are performed to obtain a calcium hydroxide blank body; then, the blank body isput into a container; pressure maintaining is performed for 4 to 6 minutes under the condition of 1 to 2kPa; a titanic acid ester solution is injected into the container at uniform speed until the calcium hydroxide blank body is submersed; then, pressure maintaining is performed for 4 to 6 minutes under the condition of 1 to 2kPa; the container injected with the titanic acid ester solution is taken out; still standing is performed for 20 to 40 minutes in air; the calcium hydroxide blank body soaked in the titanic acid ester solution is taken out; still standing is performed for 20 to 24h. Finally, heat treatment is performed for 1 to 8h under the temperature of 1300 to 1700 DEG C; natural cooling is performed; the titanium coated calcium oxide material is prepared. The process is simple;the prepared titanium coated calcium oxide material has high use temperature, stable high-temperature performance and good anti-hydration performance; high-temperature melts can be purified; the titanium coated calcium oxide material is suitable for being used as a high-temperature material for high-purity melt smelting.

Description

technical field [0001] The invention belongs to the technical field of calcium oxide materials. In particular, it relates to a titanium-coated calcium oxide material and a preparation method thereof. Background technique [0002] Calcium oxide material is a special refractory material made of calcium oxide as the main component (calcium calcite as the main mineral). It is an alkaline refractory material and is widely used in the purification of precious metals and iron and steel metallurgy because of its stable high temperature performance. The true density of calcite is 3.75g / cm 3 , melting point is 2570°C, Mohs hardness is 6 degrees, and the average linear expansion coefficient is 13.8×10 at 0~1700°C -6 / °C, thermal conductivity at 1000°C is 7.71W / (m·K), resistivity at 930°C is 4.175×106 Ω·cm, and resistivity at 1460°C is 91Ω·cm. Although calcium oxide products have the advantages of good high-temperature performance and strong resistance to alkaline slag erosion, they ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/057C04B35/622C04B41/87
CPCC04B35/66C04B35/057C04B35/622C04B41/009C04B41/5041C04B41/87
Inventor 魏耀武王金虎岳瑞
Owner WUHAN UNIV OF SCI & TECH
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