A METHOD FOR MAKING SAND COVERED WITH BENTONITE THE SAND AND A METHOD FOR RECYCLING MOLDING SAND FOR A MOLD USING THE SAND COVERED BY BENTONITE

• Main Authors: MORI KUNIYASU, YOSHIDA YASUNORI, ANDO YUKIKAZU, SUGIMOTO KAZUO, KANAYAMA RYOJI
• Format: Patent
• Language: English; Korean
• Published: 24.07.2002
• Edition: 7
• Subjects: ARTIFICIAL STONE; CASTING; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; FOUNDRY MOULDING; LIME, MAGNESIA; METALLURGY; PERFORMING OPERATIONS; POWDER METALLURGY; PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL,e.g. PLASTER; REFRACTORIES; SLAG; TRANSPORTING; TREATMENT OF NATURAL STONE; WORKING CEMENT, CLAY, OR STONE

PURPOSE: A method for making sand covered by bentonite by mixing discarded sand, reproduced sand or new sand or some or all of them with bentonite, the sand, and a method for recycling molding sand for a mold using the sand are provided. CONSTITUTION: In a method for making bentonite-covered sand by mixing reproduced sand and new sand, or one of them with bentonite so as to be used as sand supplement to collected sand, the method comprises the steps of mixing reproduced sand and new sand or one of them, floury bentonite, and water having a weight the same as or greater than that of the bentonite to make a mixture, and drying the mixture. The bentonite-covered sand is made by mixing reproduced sand and new sand or one of them, floury bentonite, and water having a weight the same as or greater than that of the bentonite to make a mixture, so that the reproduced sand and new sand or one of them is covered by the bentonite. The method for recycling molding sand comprises the steps of collecting discarded sand that is discharged from a sand processing line for a molding, reproducing the discarded sand that is collected and mixing the discarded sand with at least bentonite, so that bentonite-covered sand is made, and supplying the bentonite-covered sand to sand collected from a green sand processing line as supplementary sand. The method for recycling molding sand comprises the steps of collecting discarded sand that is discharged from a sand processing line for a molding, mixing the discarded sand with at least bentonite, so that bentonite-covered sand is made, and supplying the bentonite-covered sand to sand collected from a green sand processing line as supplementary sand. 소정의 생사가 단시간 동안 수행되는 혼합 작업에 의해 얻어진다. 폐사가 보충 모래로서 모래 가공 라인으로 제공되므로써 주물사가 재순환될 수 있다. 주형용 생사는 표면사 또는 포켓사 용으로 사용된다. 벤토나이트 피복사는 재생사, 새로운 모래 및 폐사 또는 이들 중 일부 또는 전부를 혼합하므로써 제조된다. 벤토나이트 피복사는 수집된 모래를 보충하기 위해 그것에 첨가된다. 또한, 벤토나이트 피복사는 물과 혼합되어 표면사 또는 포켓사 용으로 사용된다.