Preparation method of mullite mesh ceramic foam filter

A foamed ceramic and mullite technology, which is applied in the field of porous ceramics, can solve problems such as the influence of casting quality, and achieve the effect of good filtration and adsorption.

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

Although the cost of raw materials and the sintering temperature of this invention are relatively low...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 65wt% Al 2 o 3 , 30wt% SiO 2, 80wt% mullite phase, average particle size 200 mesh fused mullite powder 12Kg, 200 mesh kaolin powder 2.5Kg, dextrin 0.75Kg, polyethylene glycol 0.12Kg, put the powder into the mixer, add 20Kg water, and stir evenly to obtain a ceramic slurry.

[0028] Soak 20PPI sponge in 10% sulfuric acid solution for 30 minutes, wash with water, dry, and cut into square pieces of 75x75x20mm. 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.

[0029] Put the wet ceramic foam body into an oven, keep it at 100° C. for 8 hours, and obtain the ceramic foam green body. Put the dried biscuit into a box-type furnace, raise the temperature to 600°C at a rate of 60°C / h, and then r...

Embodiment 2

[0031] Take 78wt% Al 2 o 3 , 21wt% SiO 2 , 76wt% mullite phase, average particle size 300 mesh fused mullite powder 10Kg, 500 mesh bentonite powder 1.8Kg, silica sol 0.8Kg with a solid content of 25%, sodium polyacrylate 0.08Kg, put the powder into the mixer Inside, add 15Kg water, stir evenly, obtain ceramic slurry.

[0032] Soak a 10PPI 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 time of the centrifugal pulper to obtain a foamed ceramic wet body.

[0033] The wet foam ceramic body is passed through a microwave continuous drying device to dry rapidly to obtain a foam cer...

Embodiment 3

[0035] Take 65wt% Al 2 o 3 , 35wt% SiO 2 , 80wt% mullite phase, 10Kg of fused mullite powder with an average particle size of 500 mesh, 2.0Kg of talc powder of 500 mesh, 0.75Kg of polyvinyl alcohol, 0.08Kg of ammonium polyacrylate, put the powder into the mixer, and add 22Kg water, and stir evenly to obtain a ceramic slurry.

[0036] 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 dry it in the air for 10 minutes before impregnating Slurry, centrifuge and throw the slurry to obtain a wet body of foam ceramics.

[0037] The w...

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PUM

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Abstract

The invention provides a preparation method of a mullite mesh ceramic foam filter, belonging to the field of porous ceramics. The preparation method of the mullite mesh ceramic foam filter comprises the following steps of: preparing a ceramic slurry by taking electric melted mullite powder as a main raw material, kaolin, bentonite and talcum powder as slurry rheology control agents, silica sol, polyvinyl alcohol and dextrin as binders, polyethylene glycol and polyacrylate as dispersing agents and water as a solvent; soaking a polyurethane sponge foam into the ceramic slurry; removing redundant slurries contained in a sponge soaking body; drying, and then sintering so as to prepare the mullite mesh ceramic foam filter. The mullite mesh ceramic foam filter has excellent high-temperature property and fluid filtering property and can be used for the purification of molten metals, i.e. aluminum, aluminum alloys, copper, irons, and the like, thereby enhancing the cast quality and reducing the rejection rate.

Description

technical field [0001] The invention relates to a preparation method of a mullite mesh foam ceramic filter, which belongs to the field of porous ceramics. Background technique [0002] The mesh foam ceramics uses polyurethane sponge as a template, so that the sponge is immersed in the ceramic slurry to fully absorb the slurry, and then the excess slurry in the pores of the sponge is removed by extrusion and centrifugation to ensure that the ceramic slurry is only attached to the pores of the sponge. The ribs are then dried and sintered at high temperature, so that the sponge is burned out and the ceramic powder is sintered to obtain the same mesh porous structure as the sponge structure. Mesh foam ceramics usually have a porosity of 70-90%, the pore diameter is mostly 8-40PPI, the compressive strength at room temperature is greater than 1MPa, the temperature resistance is 700-1700°C, and it has excellent thermal shock resistance. Due to its mesh porous structure and excelle...

Claims

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Application Information

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