PRODUCTION OF ARTIFICIAL SAND FOR FOUNDRY SAND MOLD

PROBLEM TO BE SOLVED: To reuse fine powder sand recovered as waste as artificial sand for foundry sand mold by granulating it by adding water while stirring, burning it in a specified temperature range and making it contain a specified weight proportion grains in a specified grain size range. SOLUTI...

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Bibliographische Detailangaben
Hauptverfasser:	KOBAYASHI YOSHIAKI, IDETSU SHINYA, GUNJI YOSHITSUGU, TAKENOUCHI NORIO
Format:	Patent
Sprache:	eng
Schlagworte:	ARTIFICIAL STONE CASTING CEMENTS CERAMICS CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE FOUNDRY MOULDING GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS LIME, MAGNESIA METALLURGY PERFORMING OPERATIONS POWDER METALLURGY REFRACTORIES SLAG TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TRANSPORTING TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To reuse fine powder sand recovered as waste as artificial sand for foundry sand mold by granulating it by adding water while stirring, burning it in a specified temperature range and making it contain a specified weight proportion grains in a specified grain size range. SOLUTION: The fine powder sand is granulated so that more than 80 weight % will be within the range of 20 to 200 mesh by spraying water while stirring it at the high speed of 3,000 to 10,000 rpm. Water is preferably added in the range of 20 to 30 weight % against the fine powder sand. The granules produced are air-dried or forcefully dried with heat, and the like, and then burnt in an electric furnace, and the like at 800 to 1,000 deg.C for specified time. The artificial sand thus produced is equivalent in such properties as grain size distribution, shatter resistance, and transverse rupture strength to the molding sand, and is reusable for the foundry sand mold, thuds making it possible to reduce the disposal cost for land filling, and the like of the fine powder sand and realize the effective utilization of resources. The artificial sand obtained is low in thermal expansion but since thermal contraction occurs, no cracking is caused in the casting.