Method for preparing floamed ceramics filtrating piece for purifying magnesium and magnesium alloy fused mass

A foam ceramic filtration and melt purification technology, applied to ceramic products, chemical instruments and methods, filtration and separation, etc., can solve problems such as shear thinning, poor rheological properties, uneven adsorption, etc., and achieve reduction The number of times of repeated sticking, small resistance, and the effect of saving production time

Inactive Publication Date: 2009-10-07
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Can inevitably run into the problem that magnesium oxide hydration causes in this method
The consequence of the hydration of magnesia is that the rheological properties of the magnesia water-based slurry deteriorate. Even if the solid content of magnesia is low, it is difficult to have the characteristics of shear thinning, which makes the ceramic slurry The surface adsorption is uneven, and during the sintering process, magnesium hydroxide must first be decomposed into magnesium oxide, and then sintered, so the final product has low strength and is easy to crack

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: will have been cut into 150×25mm, polyurethane foam with a pore diameter of 10PPI is immersed in an aqueous sodium hydroxide solution with a mass concentration of 20% and a temperature of 60°C for 2 hours, then the polyurethane foam is taken out, rinsed repeatedly with clean water, and placed at temperature Dry in an oven at 80 °C for 24 hours. Dissolve 4 grams of polyvinyl butyral in 396 grams of absolute ethanol, and ball mill to dissolve in a ball mill jar, then add 600 grams of magnesium oxide with an average particle size of 0.5 microns, and continue ball milling to obtain a non-water-based slurry. Immerse the dried polyurethane foam into the above-mentioned slurry, then squeeze the excess slurry out of the polyurethane foam on a squeezer, restore the original shape, and then dry the polyurethane foam naturally in the air. Afterwards, the polyurethane foam whose surface has been covered with a dry ceramic layer is dipped into the slurry for the second ...

Embodiment 2

[0024] Example 2: will have been cut into 150×25mm, polyurethane foam with a pore size of 10PPI is immersed in a sodium hydroxide aqueous solution with a mass concentration of 15% and a temperature of 60°C for 3 hours, then the polyurethane foam is taken out, rinsed repeatedly with clean water, and placed at temperature Dry in an oven at 80 °C for 24 hours. Dissolve 12.5 grams of polyvinyl butyral in 237.5 grams of absolute ethanol, mill and dissolve in a ball mill tank, then add 750 grams of magnesium oxide with an average particle size of 5 microns, and continue ball milling to obtain a non-water-based slurry. Immerse the dried polyurethane foam into the above-mentioned slurry, then squeeze the excess slurry out of the polyurethane foam on a squeezer, restore the original shape, and then dry the polyurethane foam naturally in the air. Afterwards, the polyurethane foam whose surface has been covered with a dry ceramic layer is immersed in the absolute ethanol slurry of magn...

Embodiment 3

[0025] Example 3: will have been cut into 150×25mm, polyurethane foam with a pore diameter of 10PPI is immersed in an aqueous solution of sodium hydroxide with a mass concentration of 10% and a temperature of 60°C for 4 hours, then the polyurethane foam is taken out, rinsed repeatedly with clean water, and placed at temperature Dry in an oven at 80 °C for 24 hours. Dissolve 10 grams of polyvinyl butyral in 90 grams of anhydrous ethanol, ball mill and dissolve in a ball mill tank, then add 900 grams of magnesium oxide with an average particle size of 20 microns, and continue ball milling to obtain a non-water-based slurry. Immerse the dried polyurethane foam into the above slurry, then squeeze the excess slurry out of the polyurethane foam on a squeezer, restore the original shape, and then dry the polyurethane foam naturally in the air. Afterwards, the polyurethane foam whose surface has been covered with a dry ceramic layer is immersed for the second time in the absolute et...

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Abstract

Provided is a method for preparing floamed ceramics filtrating piece for purifying magnesium and magnesium alloy fused mass, where a polyurethane foam is used as a formwork and is preprocessed firstly, polyvinyl butyral is added into a absolute ethyl alcohol solution based on a mass concentration of 1 to 10% to ball mill and dissolve, bitter earth is then added into the solution to ball mill to obtain non-water-based ceramic slurry, wherein the proportion by weight of the bitter earth and the polyvinyl butyral absolute ethyl alcohol solution is 60-90:10-40; the formwork is immerged in the slurry to ensure the slurry be filled into the foam, jostling slurry and natural drying; then mucosity slurry and swinging slurry centrifugally, repeat to mucosity slurry and swing the slurry to dry naturally; then placing the foam in a ceramic sagger laid with flame-proof powder, elevating the temperature to 1000 to 1200 DEG C at a speed of 0.5-2 DEG C / min, heat preserving for 5 to 10 hours, and drawing a charge after air cooling. The present invention has well thermal shock resistance, thermal epistasis and dimension heat endurance, framework surface finish quality is high, filtrating and adsorption capacity is well, the porosity is near of polyurethane foam, the resistance force to magnesium alloy fused mass is small, the filter capacity is large and pollution will not be caused to alloy.

Description

technical field [0001] The invention belongs to metal melt purification technology, in particular to a method for a foam ceramic filter used for filtering and purifying magnesium and magnesium alloy metal melts. Background technique [0002] Magnesium is the eighth most abundant element in the world, and its alloy density is about 1.8g / cm 3 , 2 / 3 of aluminum, 1 / 4 of steel and zinc. Under the strategic requirements of resource conservation and pollution reduction for sustainable social development, magnesium alloys have become very important modern industrial materials due to their high strength, good shock absorption, machinability and dimensional stability. At present, magnesium alloys are mainly used in industries such as automobile manufacturing, aerospace, optical instruments, computer manufacturing, household appliances, communications and medical equipment. In recent years, the requirements for magnesium alloy materials at home and abroad have become higher and highe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/04B01D39/20C22C9/02
Inventor 毕秋李克
Owner NANCHANG UNIV
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