Abstract: The present invention relates to a vertical furnace for fabricating an artificially lightweight fine-aggregates in that the aggregates can be fired in the vertical furnace in a floating state, so that the contacting time between the aggregates can be minimized, thereby preventing the adhesion between the aggregates and manufacturing the artificially lightweight fine-aggregates as an insulating concrete for building material, sound-absorbing materials, and lagging material.

Abstract: The present invention relates to the method of manufacturing crystallized glass composition stable in an acid solution from electric arc furnace dust wasted as an industrial waste in the course of melting and recycling steel scrap in an iron work, the method of manufacturing crystallized glass composition stable in an acid solution using steel dust wasted from an electric furnace, comprising steps of (1) mixing a silicate type glass frit and steel dust wasted from an electric furnace; (2) heating the mixed mixture and melting it to form the melted product; (3) rapidly chilling the melted product in air to form parent glass; (4) thermally treating the parent glass.

Abstract: The present invention relates to a vertical furnace for fabricating an artificially lightweight fine-aggregates in that the aggregate,; can he fired in the vertical furnace in a floating state, so that the contacting time between the aggregates can he minimized, thereby preventing the adhesion between the aggregates and manufacturing the artificially lightweight fine-aggregates as an insulating concrete for building material, sound-absorbing materials, and lagging material.

Abstract: This invention relates to a method for manufacturing an artificial ultra-lightweight aggregate having a specific gravity of 0.8-0.9 using raw sewage sludge. According to the invention, raw sewage sludge and water-free waste are mixed into a blend having a water content that allows the optimal extrusion, whereby excellent ultra-lightweight aggregate which has low water absorption rate and, low slump loss can be produced. In addition, the collective treatment of waste and the mass production of recycled products are possible without addition of a drying process for raw sewage sludge, and thus excellent ultra-lightweight aggregate can be supplied at low cost.

Abstract: This invention relates to a method for manufacturing an artificial ultra-lightweight aggregate having a specific gravity of 0.8-0.9 using raw sewage sludge. According to the invention, raw sewage sludge and water-free waste are mixed into a blend having a water content that allows the optimal extrusion, whereby excellent ultra-lightweight aggregate which has low water absorption rate and, low slump loss can be produced. In addition, the collective treatment of waste and the mass production of recycled products are possible without addition of a drying process for raw sewage sludge, and thus excellent ultra-lightweight aggregate can be supplied at low cost.

Abstract: A ceramic composition made from waste materials and a method for manufacturing the same are disclosed. The ceramic composition comprises between 5 and 75 by weight part of a solid stated waste material including heavy metals, between 15 and 45 by weight part of a fly ash and between 5 and 55 by weight part of a clay. The ceramic composition is manufactured by compositely stabilizing various waste materials and is available for a building material or an engineering material. Therefore, the waste materials are effectively recycled without causing environmental pollution.