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Sican tumi, or ceremonial knife, Peru, 850–1500 CE. Metallurgy in pre-Columbian America is the extraction, purification and alloying of metals and metal crafting by Indigenous peoples of the Americas prior to European contact in the late 15th century.
A modern crucible used in the production of silicon ingots via the Czochralski process Smaller clay graphite crucibles for copper alloy melting. A crucible is a container in which metals or other substances may be melted or subjected to very high temperatures.
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In a smelting furnace, up to four different phases might co-exist. From the top of the furnace to the bottom, the phases are slag, matte, speiss, and liquid metal. [3] Slag can be classified as furnace slag, tapping slag or crucible slag depending on the mechanism of production. The slag has three functions.
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Archaeological remains of Early Bronze copper mining and copper smelting in the vicinity of the mines were found in Trans-Jordan (Feinan), the Arava Valley , and southern Sinai. [10] The only production remains of metal are those of copper and include copper slag, prills, and amorphous copper lumps and small shallow ball-shaped clay crucibles ...
As Walmart celebrates the 62nd anniversary of its first store opening on July 2, 1962, let's take a look back at the early beginnings of one of the world's largest retailers.
Iron alloys are most broadly divided by their carbon content: cast iron has 2–4% carbon impurities; wrought iron oxidizes away most of its carbon, to less than 0.1%. The much more valuable steel has a delicately intermediate carbon fraction, and its material properties range according to the carbon percentage: high carbon steel is stronger but more brittle than low carbon steel.
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