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Mullite ceramic foam filter for casting and preparation method thereof

A foamed ceramic and mullite technology, applied in the field of porous ceramics, achieves the effects of good filtration and adsorption, obvious purification effect and low cost

Inactive Publication Date: 2011-09-07
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the research and production of foam ceramics at home and abroad, mullite foam ceramics are rarely involved.

Method used

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  • Mullite ceramic foam filter for casting and preparation method thereof
  • Mullite ceramic foam filter for casting and preparation method thereof
  • Mullite ceramic foam filter for casting and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 40wt% Al 2 o 3 , 50wt% SiO 2 10Kg of bauxite, after being crushed by jaw crusher and roller crusher, put into ball mill and grind into bauxite fine powder with particle size less than 200 mesh, then add 4.9Kg of alumina powder, 0.9Kg of dextrin, 0.1Kg of bauxite polyethylene glycol, put the powder into a stirrer, add 20.5Kg of water, and stir evenly to obtain a ceramic slurry.

[0034] Soak 20PPI sponge in 5% dilute hydrochloric acid solution for 30 minutes, wash with water, dry, and cut into square pieces of 75x75x22mm. Soak the sponge sheet in the above ceramic slurry to make the sponge fully absorb the slurry. Then make the sponge that has fully absorbed the ceramic slurry pass through a double-roll extruder, and adjust the roller gap of the double-roll extruder to squeeze out excess slurry in the sponge to obtain a foamed ceramic wet body.

[0035] Put the wet ceramic foam body into an oven, keep it at 100°C for 4 hours to dry, and obtain the ceramic foam g...

Embodiment 2

[0037] Take 80wt% Al 2 o 3 , 10wt% SiO 2 10Kg of bauxite is crushed by jaw crusher and roller crusher, calcined at 400°C for 2 hours, then put into a ball mill and ground into bauxite fine powder with a particle size of less than 200 mesh, and then add 1Kg of silica powder, Put 0.5Kg of kaolin, 0.3Kg of talcum powder, 0.5Kg of silica sol with a solid content of 25wt%, and 0.19Kg of sodium polyacrylate into a ball mill, add 9.75Kg of water, and fully ball mill to obtain a uniformly dispersed ceramic slurry.

[0038] Soak a 5PPI sponge in 10% sodium hydroxide solution for 60 minutes, wash it with water, dry it, and cut it into discs with a diameter of 50 mm and a thickness of 20 mm. Soak the sponge disc in the above ceramic slurry to make the sponge fully absorb the slurry. Then, the sponge that has fully absorbed the ceramic slurry is passed through a centrifugal pulper, and the excess slurry in the sponge is squeezed out by adjusting the rotating speed and centrifugation ti...

Embodiment 3

[0041] Take 54wt% Al 2 o 3 , 38wt% SiO 2 10Kg of bauxite is crushed by jaw crusher and roller crusher, calcined at 600°C for 4 hours, then put into ball mill to grind into bauxite fine powder with a particle size of less than 200 mesh, and then add 2.0Kg kaolin, 0.2Kg Bentonite, 1.0Kg talcum powder, 0.6Kg polyvinyl alcohol, 0.1Kg ammonium polyacrylate, put the above raw materials into a mixer, add 5.3Kg water, and stir well to obtain a uniformly dispersed ceramic slurry.

[0042] Soak a 60PPI sponge in 15% potassium hydroxide solution for 20 minutes, wash it with water, dry it, and cut it into discs with a diameter of 75 mm and a thickness of 22 mm. Soak the sponge disc in the above ceramic slurry to make the sponge fully absorb the slurry. Then let the sponge that has fully absorbed the ceramic slurry go through a centrifugal pulper to shake the pulp, adjust the speed and centrifugation time of the centrifugal pulper to squeeze out the excess slurry in the sponge, and then...

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Abstract

The invention belongs to the field of porous ceramic, and provides a mullite ceramic foam filter for casting. The mullite ceramic foam filter for casting comprises the following chemical components: 40-80 wt% of Al2O3, 10-50 wt% of SiO2 and 1-10 wt% of alkali-earth oxide. The mullite ceramic foam filter for casting is in a mutually-communicated mesh porous structure. The preparation method comprises the following steps: using natural alumina containing 40-80 wt% of Al2O3 as the main raw material, adding one or more of silicon dioxide, aluminum oxide, kaolin, bentonite and talcum powder as the auxiliary material, and adding adhesive, dispersant and water to obtain a ceramic slurry; and immersing polyurethane sponge foam into the slurry, removing the excessive slurry, drying, and sintering at high temperature to obtain the mullite ceramic foam filter. The invention has excellent thermal impact resistance and molten metal attack resistance, and can be widely used for filtering, purifying and rectifying aluminum, aluminum alloy, copper, iron or any other molten metal liquid, thereby greatly enhancing the quality and yield of castings.

Description

technical field [0001] The invention relates to a mullite foam ceramic filter for casting and a preparation method thereof, belonging to the field of porous ceramics. Background technique [0002] Foam ceramics are an important branch of porous ceramics. Schwartzwalder (US Patent No. 3090094) invented the organic foam impregnation process for preparing foam ceramics in 1963, thus opening up a new situation of large-scale research and application of foam ceramics in modern industry. In 1978, American researchers took the lead in developing porous ceramics suitable for aluminum alloy casting by using this process, using alumina and kaolin as raw materials, which can significantly improve the quality of castings and reduce the scrap rate. Afterwards, many countries began to carry out research on foam ceramics, and successively developed a variety of materials and pore structures, various series of pore size distributions, and foam ceramic materials suitable for different purpo...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B35/185C04B35/10C04B35/622B01D39/20
Inventor 丁书强王自强王泽华王冬冬
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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