Fuse-quench
Fuse-quench : Also called the Kjellgren-Sawyer process. A process for extracting beryllium from beryl. The beryl is fused at 1,600?C and then rapidly quenched by pouring through a water jet of high velocity. The glassy product is heated to 900?C to precipitate beryllia from its solid solution in silica, and then extracted with sulfuric acid