日本盛产核桃的氏野县和田村从60年代就开发了加工核桃壳为研磨材的方法。目前县内的核桃壳购价每公斤约20日元,从美国和中国进口的核桃壳,每公斤约60—80日元。研磨的方法有两种:一是喷射研磨,即将核桃壳粉末吹向被磨物;另一种是滚磨法,即将核桃壳粉一起放入滚筒转动。粉末的粒径有15种之多,被磨品有眼镜框、钮扣、食品类、半导体零部件等等。粉末粒大的价格较高,每公斤140日元左右。径小的 Japan Watson County Wada and Wada Tamura developed from the 60’s walnut shell processing methods for the grinding material. Currently the county’s walnut shell purchase price of about 20 yen per kilogram, imports from the United States and China walnut shell, about 60-80 yen per kilogram. There are two methods of grinding: First, jet grinding, the walnut shell powder is about to be blown mill material; the other is the rolling method, the walnut shell powder is about to turn into the drum. There are 15 kinds of powder particle size, abrasive glasses frame, buttons, food, semiconductor components and so on. The larger the price of powder tablets, 140 yen per kilogram or so. Small diameter