Selenium Metallurgy

In mineral technology, sulfur dioxide and sulfites are used as flotation depressants for sulfide ores. In electrowinning of copper from leach solutions from ores containing iron, sulfur dioxide prereduces ferric to ferrous ions to improve current efficiency and copper cathode quaHty. Sulfur dioxide also initiates precipitation of metallic selenium from selenous acid, a by-product of copper metallurgy (326). 

V. H. Aprahamian and D. G. Demopoulos, The Solution Chemistry and Solvent Extraction Behaviour of copper, iron, nickel, zinc, lead, tin, Ag, arsenic, antimony, bismuth, selenium and tellurium in Acid Chloride Solutions Reviewed from the Standpoint of PGM Refining, Mineral Processing and Extractive Metallurgy Review, Vol. 14, p. 143,1995. 

U.S. imports by class and country, 3 49t world mine production, reserves, and reserve base, 3 42t Antimony (III) acetate, 3 65 Antimony alloys, 3 41-56 compositional ranges, 3 52t process metallurgy, 3 44-47 selenium and metallurgy of, 22 98 uses of, 3 51-54... 

Cobalt alloys, 7 219-226. See also Cobalt high temperature alloys for orthopedic devices, 3 728 selenium and metallurgy of, 22 98 Cobalt alloy T-800, 7 223 properties, 7 223t CobaltCII) aluminate, uses, 7 241t Cobalt aluminate blue spinel, formula and DCMA number, 7 348t Cobalt Aluminate Blue, pigment for plastics, 7 370t... 

Ferrous metallurgy nitrogen in, 17 286 silicon carbide in, 22 540-541 Ferrous metals. See also Ferrous scrap recycling, 21 407-417 selenium and metallurgy of, 22 97-98, 98-99... 

Iron alloys, selenium and metallurgy of, 22 98. See also Ferrosilicon Iron aluminide... 

Selenium and tellurium are mainly used as additives in metallurgy, though selenium is also used in glass and as a photoconductor (especially in Xerox machines). Polonium is used as a heat or power source in satellites. 

In the United States, selenium is also used in a variety of applications, including agriculture and metallurgy. Metallurgy refers to the art and science of working with metals. One agricultural use involves the... 

The 1995 consumption patterns for selenium by industry were as follows glass, 35% electrical, 30% pigments, 10% metallurgy, 10% agricultural/biological, 5% and miscellaneous, 10% (Hoffmann and King 1997). 

Free-machining alloys (metallurgy) Alloys that have additions of sulfur or selenium to make them more easily machinable. These additions can cause trouble later in passivation and corrosion protection. 

Electronic uses of selenium are related to its semiconductor and photoelectric characteristics. Selenium is used in the manufacture of semiconductors, thermoelements, photoelectric and photocells, and xerographic materials. In metallurgy selenium improves the stability and machineability of various allys, is used to color copper alloys, and is added to stainless steel to enhance the corrosion resistance [44]. 

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