to charge a furnace
81Convoy SC 121 — A depth charge being loaded onto a depth charge thrower aboard the corvette HMS Dianthus, 14 August 1942 Convoy SC 121 was the 121st of the numbered series of World War II Slow Convoys of merchant ships from Sydney, Cape Breton Island to… …
82Han Dynasty — 漢朝 ← 206 BCE–220 CE …
83Smelting — For other uses, see Smelt (disambiguation). Electric phosphate smelting furnace in a TVA chemical plant (1942) Smelting is a form of extractive metallurgy; its main use is to produce a metal from its ore. This includes iron extraction from …
84Crucible steel — Iron alloy phases Ferrite (α iron, δ iron) Austenite (γ iron) Pearlite (88% ferrite, 12% cementite) …
85Du Shi — An illustration of blast furnace bellows operated by waterwheels, from the Nong Shu, by Wang Zhen, 1313 AD, during the Yuan Dynasty of China. Du Shi (Chinese: 杜詩; pinyin: Dù Shī; Wade–Giles: Tu Shih, d …
86basic oxygen process — a high speed method of steelmaking in which oxygen of high purity is blown through an oxygen lance at high velocity onto the surface of a bath containing steel scrap and molten pig iron within a vessel with a basic lining (basic oxygen furnace).… …
87rare-earth element — /rair errth /, Chem. any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons. Also called rare earth metal. [1955 …
88Direct reduced iron — (DRI), also called sponge iron,[1] is produced from direct reduction of iron ore (in the form of lumps, pellets or fines) by a reducing gas produced from natural gas or coal. The reducing gas is a mixture majority of hydrogen (H2) and carbon… …
89Bakumatsu — History of Japan Samurai of the Satsuma clan. Paleolithic 35,000–14,000 BC Jōmon period 14,000–300 BC Yayoi period 300 BC–250 AD …
90Medieval technology — Pumhart von Steyr, a 15th century supergun …
