ziervogel process

\\ˈtsirˌfōgəl-\ noun

Usage: usually capitalized Z

Etymology: probably after Ziervogel, 19th century German metallurgist

: a process of extracting silver from its ores by roasting them so as to convert it into sulfate, leaching with water to dissolve the sulfate, and precipitating the silver by means of scrap iron or other reagent