a refining process for nonoxidizing metals,such as silver and gold,in which a metallic mixture is oxidized at high temperatures and base metals are separated by absorption into the walls of a cupel

• 一种使银和金等金属不氧化的提纯过程，在高温下金属混合物被氧化，低劣金属被分离出来并吸入烤钵的墙上