Calcium oxide foam ceramic and preparation method thereof

A technology of foam ceramics and calcium oxide, which is applied in the field of foam ceramics, can solve the problems of difficult preparation of calcium oxide raw material calcium oxide filter material, low flow rate of metal melt, easy hydration of calcium oxide particles, etc., and achieve low cost, high heat Good stability and small fluid pressure loss

CN106631121AInactive Publication Date: 2017-05-10WUHAN UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-05-10
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

The invention relates to calcium oxide foam ceramic and a preparation method thereof. The preparation method thereof is technically characterized by comprising the following steps of mixing 90 to 99.5wt% of calcium hydroxide powder and 0.5 to 10wt% of other hydroxides, so as to obtain mixed powder; adding 0.1 to 3wt% of additive and 30 to 100wt% of water into the mixed powder, and mixing in a wet way, so as to obtain slurry; soaking a polyurethane sponge into the slurry for 2 to 20min, fetching out the polyurethane sponge containing the slurry, and extruding; drying the extruded polyurethane sponge at the temperature of 110 DEG C for 12 to 24h, so as to obtain a prefabricated block of the calcium oxide foam ceramic; finally, putting the prefabricated block of the calcium oxide foam ceramic into a heating furnace, heating to 1400 to 1700 DEG C, insulating heat for 1 to 5h, and naturally cooling, so as to obtain the calcium oxide foam ceramic. The calcium oxide foam ceramic has the advantages that the technology is simple, the cost is low, and the energy consumption is low; the prepared calcium oxide foam ceramic has high use temperature, stable high temperature property and good anti-hydration property, and is suitable for using as a high-temperature material for smelting high-purity melts.
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Description

technical field

[0001] The invention belongs to the technical field of foam ceramics. In particular, it relates to a calcium oxide foam ceramic and a preparation method thereof. Background technique

[0002] High-purity metal materials have excellent performance and special uses, but in the process of melting or continuous casting, due to the contact with the furnace lining material, the purity of the metal melt is inevitably affected, which is specifically manifested in the metal material There are certain oxide or non-oxide inclusions of different shapes, and their quantity, size, shape, type, and distribution all have a destructive effect on the strength, plasticity, and toughness of metal materials, and it is easy to cause pores and slag inclusions in metal products Defects such as cracks and cracks will degrade metal products and even become a hidden danger of safety accidents in severe cases. Therefore, the use of simple and effective purification methods to reduce t...

Examples

Embodiment 1

[0020] A calcium oxide foam ceramic and a preparation method thereof. The technical solution is: first mix 90-93wt% calcium hydroxide powder with 7-10wt% other hydroxides to obtain a mixed powder; then add 0.1-1wt% of additives and 30-50wt% of the mixed powder water, wet mixed to obtain a slurry; immerse the polyurethane sponge in the slurry for 2 to 7 minutes, take out the polyurethane sponge containing the slurry, and extrude; then place the extruded polyurethane sponge at 110°C Drying for 12 to 15 hours under high temperature to obtain calcium oxide foam ceramic prefabricated blocks; finally, put the calcium oxide foam ceramic prefabricated blocks into a heating furnace, raise the temperature to 1400~1500°C, keep it warm for 1 to 2 hours, and cool naturally to obtain oxidized Calcium foam ceramics.

[0021] The other hydroxide described in this embodiment is zirconium hydroxide; the additive is calcium lignosulfonate;

[0022] The calcium oxide foam ceramics prepared in t...

Embodiment 2

[0024] A calcium oxide foam ceramic and a preparation method thereof. Present embodiment except described other hydroxide, all the other are with embodiment 1:

[0025] The other hydroxide is a mixture of any two of zirconium hydroxide, magnesium hydroxide, aluminum hydroxide, beryllium hydroxide and titanium hydroxide.

[0026] The calcium oxide foam ceramics prepared in this example are tested: the CaO content is 85.1~85.9wt%, and the compressive strength is 2.3~2.5MPa; it is kept at 50°C and 90% humidity for 10h, dried at 110°C, and the calcium oxide The hydration weight gain rate of foam ceramics is 1.7~1.9%.

Embodiment 3

[0028] A calcium oxide foam ceramic and a preparation method thereof. The technical solution is: first mix 93-95wt% calcium hydroxide powder with 5-7wt% other hydroxides to obtain mixed powder; then add 1-2wt% additive and 50-70wt% water, wet mixed to obtain a slurry; immerse the polyurethane sponge in the slurry for 7 to 12 minutes, take out the polyurethane sponge containing the slurry, and extrude; then place the extruded polyurethane sponge at 110°C Drying for 15 to 20 hours under high temperature to obtain calcium oxide foam ceramic prefabricated blocks; finally, put the calcium oxide foam ceramic prefabricated blocks into a heating furnace, raise the temperature to 1500~1600°C, keep it warm for 2 to 3 hours, and cool naturally to obtain oxidized Calcium foam ceramics.

[0029] The other hydroxide described in this embodiment is magnesium hydroxide; the additive is wood carboxymethyl cellulose.

[0030] The calcium oxide foam ceramics prepared in this example are tested...