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Abstract

Disclosed is a process for manufacturing high-density biostone with ceramic powder emitting a far infrared ray, comprising preparing the ceramic powder by mixing 85.about.92% by weight of Al.sub.2O.sub.3, 3.about.7% by weight of SiO.sub.2, 3.about.7% by weight of MgO and 1.about.4% by weight of clay as major ingredients and ball milling it for 48 hrs; adding 0.6% by weight of dispersants, 1% by weight of wetting agents, 0.6% by weight of glycerin, 20% by weight of binders and 0.5% by weight of anti-forming agents as minor ingredients based on 100% by weight of the ball milled mixture to 35% by weight of water of 60.degree. C., stirring it and adding it to the ball milled mixture; and wet grinding the resulting mixture with ball mill about 24 hrs and spray drying it to obtain a ceramic powder having a diameter of about 60 to 80 meshes; introducing the mixed ceramic powder into a shape of mold and pressurizing and compression molding it with a pressure of 0.8.times.10.sup.3 Kg/cm.sup.2 to 1.2.times.10.sup.3 Kg/cm.sup.2 to obtain ceramic forms; and loading the forms an airtight sintering furnace and sintering it at 1580.degree. C. to 1600.degree. C. for 12 hrs under oxidizing atmosphere. The biostone manufactured by such ceramic powders emits far infrared ray emissivity and emission energy suitable for human body, and minimizes and delays a production of oxidation materials as long term thermal oxidation of edible oils and fats when it is used in a cooking procedure using edible oils and fats.

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