Metallurgy deposition

Thus damage locations, although usually widespread, are dependent on many factors. Metallurgy, deposition, design, temperature, pH, water content, dissolved-ion concentration, flow, and other factors all influence attack. 

F. W. Fraser and C. B. Belcher, "Mineralogical Studies of the Groote Eylandt Manganese Ore Deposits," Proceedings Mustralasian Institute of Minerals and Metallurgy tFo. 254, June 1975. 

In the carbonyl process, the Hquid is purified, vaporized, and rapidly heated to ca 300°C which results in the decomposition of the vapor to carbon monoxide and a fine high purity nickel powder of particle sizes <10 fim. This product is useflil for powder metallurgical appHcations (see Metallurgy, powder). Nickel carbonyl can also be decomposed in the presence of nickel powder, upon which the nickel is deposited. This process yields nickel pellets, typically about 0.8 cm dia and of >99.9 wt% purity. 

Nonferrous Metal Production. Nonferrous metal production, which includes the leaching of copper and uranium ores with sulfuric acid, accounts for about 6% of U.S. sulfur consumption and probably about the same in other developed countries. In the case of copper, sulfuric acid is used for the extraction of the metal from deposits, mine dumps, and wastes, in which the copper contents are too low to justify concentration by conventional flotation techniques or the recovery of copper from ores containing copper carbonate and siUcate minerals that caimot be readily treated by flotation (qv) processes. The sulfuric acid required for copper leaching is usually the by-product acid produced by copper smelters (see Metallurgy, extractive Minerals RECOVERY AND PROCESSING). 

In a chemical vapor deposition (CVD) variant of conventional powder metallurgy processing, fine chromium powder is obtained by hydrogen reduction of Crl2 and simultaneously combined with fine thorium(IV) oxide [1314-20-17, H1O2, particles. This product is isostaticaHy hot pressed to 70 MPa (700 atm) and 1100°C for 2 h. Compacts are steel clad and hot roUed to sheets (24). 

Copper ore minerals maybe classified as primary, secondary, oxidized, and native copper. Primaryrninerals were concentrated in ore bodies by hydrothermal processes secondary minerals formed when copper sulfide deposits exposed at the surface were leached by weathering and groundwater, and the copper reprecipitated near the water table (see Metallurgy, extractive). The important copper minerals are Hsted in Table 1. Of the sulfide ores, bornite, chalcopyrite, and tetrahedrite—teimantite are primary minerals and coveUite, chalcocite, and digenite are more commonly secondary minerals. The oxide minerals, such as chrysocoUa, malachite, and azurite, were formed by oxidation of surface sulfides. Native copper is usually found in the oxidized zone. However, the principal native copper deposits in Michigan are considered primary (5). 

The power train (Figure 8-10) was eommissioned in May 1989. Table 8-1 provides data on the maehine in question. Tables 8-2 and 8-3 show flue gas analysis from the regenerator to the gas expander turbine inlet and the relevant metallurgy, respeetively. There are many possible failure modes in gas expanders, whieh inelude erosion, eatalyst deposition, and exeessive meehanieal vibration. Obviously, these faetors may also eause power loss, and some power trains do indeed fall short of produeing the expeeted power. Nevertheless, in some eases operation at off-design expander system eonditions eould be the primary eause of performanee defieieneies. 

Chemical vapor deposition (CVD) has grown very rapidly in the last twenty years and applications of this fabrication process are now key elements in many industrial products, such as semiconductors, optoelectronics, optics, cutting tools, refractory fibers, filters and many others. CVD is no longer a laboratory curiosity but a maj or technology on par with other maj or technological disciplines such as electrodeposition, powder metallurgy, or conventional ceramic processing. 

The principal minerals of Be arc listed in Table 1, the most abundant being beryl, the only one of commercial significance. Phcnacitc, chrysoberyl, bertrandite and barylitc arc constituents of recently discovered Be-containing deposits future extraction of Be from these ores is currently being considered. The other minerals are not found in sufficient quantities to constitute possible commercial sources of Be. The majority of the ores, including beryl, are complex silicate materials from which it is difficult to extract the metal consequently. Be extractive metallurgy is both complex and expensive. 

Metallurgy is the production and purification of metals from naturally occurring deposits called ores. It has an ancient histoiy and may represent the earliest useful application of chemistry. Metallurgical advances have had profound influences on the course of human civilization, so much so that historians speak of the Bronze Age (ca. 

Ellis, A.J. (1969) Pre.sent-day hydrothermal systems and mineral deposition. 9th Commonwealth Mining and Metallurgical Congress, Mining and Petroleum Geology Scet., Paper 7. London Inst. Mining and Metallurgy, pp. 1-30. 

Acids, when used as scale inhibitors, are extremely corrosive. Their effectiveness has been laboratory tested. Parameters include acid type, metallurgy, temperature, inhibitor type and concentration, duration of acid-metal contact, and the effect of other chemical additives [279]. Lead and zinc sulphide scale deposits can be removed by an acid treatment [922]. 

Passivation of device by silicon nitride deposition over terminal metallurgy... 

Shilts, W.W. 1975. Principles of geochemical exploration for sulphide deposits using shallow samples of glacial drift. Canadian Institute of Mining and Metallurgy Bulletin, 68, 73-80. 

Miller, A.R., Stanton, R.A., Cluff, G.R., Male, M.J., 1986. Uranium deposits and prospects of the Baker Lake Basin and subbasins Central District of Keewatin, Northwest Territories. In Evans, E.L. (Ed.) Uranium Deposits of Canada. Canadian Institute of Mining and Metallurgy, Special Volume 33, 263-285. 

Amplats - Mine 3 South Africa, Morensky Reef Grind To a K%0 of 87 pm Reagents CUSO4 = 100-200 g/t, dibutyl xanthate = 320 g/t. Modified guar gum = 200-250 g/t Metallurgy 90-100 g/t total PGM in concentrate, PGM recovery = 80-82% Ore Sulphide-dominated PGM deposit containing Cu/Ni and mixed pyrite-pyrrhotite. The main floatable gangues are calcite, chlorites with lesser talc... 

Jonasson, I.R. Goodfellow, W.D. 1986. Sedimentary and diagenetic textures, and deformation structures within sulfide zone of Howards Pass (XY) Zn-Pb deposit, Yukon and Northwest Territories. In Mineral Deposits of Northern Cordillera, Special Volume 37, Canadian Institute of Mining and Metallurgy, 51-70. 

Carne, R.C. Catthro, R.J. 1982. Sedimentary exhalative (sedex) zinc-lead deposits, northern Canadian Cordillera. Canadian Institute of Mining and Metallurgy, Bulletin, 75, 66-78. 

Rozendaal, a. Stumpfl, E.F. 1984. Mineral chemistry and genesis of Gamsberg zinc deposit. South Africa. Transactions of the Institution of Mining and Metallurgy. Section B Applied Earth Science, 93, B161-B175. 

Atkinson, D. Baker, D.J. 1986. Recent developments in the geologic understanding of Mactung, In Morin, J.A. (ed.), Mineral Deposits of the Northern Cordillera. Canadian Institute of Mining and Metallurgy Special 37, 234-244. 

Sweet, G., Waters, P., Baker, M., Hollings, P., Cooke, D.R. 2008. The Black Mountain porphyry Cu-Au deposit, Baguio, Philippines. Australasian Institute of Mining and Metallurgy, PACRIM Congress 2008, The Pacific Rim Mineral Endowment,... 

Perello, J.A., Fleming, J.A., O Kane, K.P., Burt, P.D., Clarke, G.A., Himes, M.D., Reeves, A.T. 1995. Porphyry copper-gold-molybdenum deposits in the Island Copper cluster, northern Vancouver Island, British Columbia. In Schroeter, T.G. (ed.). Porphyry Deposits of the Northwestern Cordillera of North America. Canadian Institute of Mining, Metallurgy and Petroleum, Special Volume 46, 214-238. 

Kerrich, R. Hodder R.W. 1982. Archean Lode Gold and Base Metal Deposits Evidence for Metal Separation into Independent Hydrothermal Systems, Geology of Canadian Gold Deposits Canadian Institute of Mining and Metallurgy, 144-160. 

SiDWELL, K.O.J. 1957. The Woodstock, N.B., Iron - Manganese Deposits. Transactions Canadian Institute of Mining Metallurgy, 50, 411 16. 

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