roasting furnace
71George Dern — George Henry Dern 52nd United States Secretary of War In office March 4, 1933 – August 27, 1936 President Franklin D. Roosevelt …
72Ming Dynasty — Great Ming 大明 ← 1368–1644 …
73Lead glass — Swarovski flacon. Lead glass is a variety of glass in which lead replaces the calcium content of a typical potash glass.[1] Lead glass contains typically 18–40 weight% lead(II) oxide (PbO), while modern lead …
74Song Yingxing — (Traditional Chinese:宋應星; Simplified Chinese:宋应星; Wade Giles: Sung Ying Hsing; 1587 1666 AD) was a Chinese scientist and encyclopedist who lived during the late Ming Dynasty (1368 1644). He was the author of an encyclopedia that covered a wide… …
75Pyroprocessing — (from Greek Πυρος = fire ) is a process in which materials are subjected to high temperatures (typically over 800°C) in order to bring about a chemical or physical change. Pyroprocessing includes such terms as ore roasting, calcination and… …
76Business and Industry Review — ▪ 1999 Introduction Overview Annual Average Rates of Growth of Manufacturing Output, 1980 97, Table Pattern of Output, 1994 97, Table Index Numbers of Production, Employment, and Productivity in Manufacturing Industries, Table (For Annual… …
77Cobalt extraction techniques — Cobalt ore Several methods exist for the separation of cobalt from copper and nickel. They depend on the concentration of cobalt and the exact composition of the used ore. Contents …
78Death by burning — Part of a series on Capital punishment Issues Debate · …
79Technological and industrial history of Canada — The technological and industrial history of Canada encompasses the country s development in the areas of transportation, communication, energy, materials, public works, public services (health care), domestic/consumer and defense technologies.… …
80Mining in the Upper Harz — The headframe of the Emperor William Shaft in Clausthal is one of the oldest surviving winding towers in Germany …
