Metallurgical Transactions B
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Comparison of theoretically predicted and experimentally determined submerged arc weld deposit compositions
Metallurgical Transactions B - Tập 14 Số 3 - Trang 510-513 - 1983
Montecarlo calculations of ionic structure in silicate and alumino-silicate melts
Metallurgical Transactions B - Tập 10 - Trang 21-25 - 1979
Results on structures of molten silicates and alumino-silicates calculated with the Montecarlo method are reported. The structure of the ions is in agreement with Masson’s hypotheses; in fact ions of the type SinO
(3n+1
with chains even 30 + 35 atoms long have been found. The spatial configurations of the polyme......
Reducibility of laterite ores
Metallurgical Transactions B - Tập 19 - Trang 181-186 - 1988
The reducibility of several types of lateritic nickel bearing ores was investigated. The ores were reduced with hydrogen over a temperature range of 673 to 1273 K and reaction times from 5 to 80 minutes. The fraction of nickel, iron, and cobalt reduced to the metallic state was determined by leaching the reacted samples with a bromine-methanol solution followed by atomic absorption analysis for th......
On the aluminothermic reduction of calcium vanadate
Metallurgical Transactions B - Tập 8 - Trang 683-685 - 1977
Acid dissolution of willemite (Zn, Mn)2 SiO4) and hemimorphite (Zn4Si2O7(OH)2 H2O)
Metallurgical Transactions B - Tập 14 - Trang 335-346 - 1983
The influence of temperature, pH, acid type, and surface area on the kinetics of the acid dissolution of natural and synthetic willemites and natural hemimorphites has been investigated. Specific rate constants, based upon areas determined by krypton adsorption measurements, were estimated from the experimental data obtained. For both willemite and hemimorphite, the rates of dissolution in differe......
Gas carburizing of steel with furnace atmospheres formedIn Situ from propane and air: Part I. The effect of air-propane ratio on furnace atmosphere composition and the amount of carburizing
Metallurgical Transactions B - Tập 11 - Trang 471-479 - 1980
Gas carburizing experiments were conducted in a batch-type sealed quenched furnace at 843 and 927 °C using furnace atmospheres produced by reacting propane and air within the furnace chamber. With low, constant gas flow rates it is shown that the amount of carburizing varies regularly with air-propane ratio. Furnace atmosphere composition was monitored as a function of temperature and air-propane ......
Successive gas-solid reaction model for the hydrogen reduction of cuprous sulfide in the presence of lime
Metallurgical Transactions B - Tập 16 - Trang 645-661 - 1985
As an alternative to conventional smelting processes for producing metals from sulfide ores, which suffer from SO2 emission problems, direct reduction in the presence of lime has in recent years attracted much attention. In this work, a mathematical model of successive gas-solid reactions in a porous pellet has been applied to the hydrogen reduction of cuprous sulfide (Cu2S) in the presence of lim......
Velocity and absorption coefficient of ultrasonic waves in molten and glassy silicates and borates
Metallurgical Transactions B - - 1987
Rate of reduction of FeO in slag by Fe-C drops
Metallurgical Transactions B - Tập 23 - Trang 29-37 - 1992
The rate of reduction of FeO in slags by Fe-C drops plays an important role in several metallurgical processes, including iron bath smelting. In this study, the rate of this reaction was determined by measuring the volume of CO generated as a function of time, and the reaction was observed by X-ray fluoroscopy. The drops entered the slag in a nearly spherical shape, remained as single particles, a......
High temperature thermodynamics of the Cr-Cr2N-N2 system
Metallurgical Transactions B - Tập 19 - Trang 471-476 - 1988
The high-temperature thermodynamic behavior of the Cr-Cr2N-N2 system has been investigated in the temperature range 1450 to 1850 K by measuring the equilibrium pressure of nitrogen gas over pure chromium metal and chromium nitride Cr2N. From the experimental data, the standard free energy and enthalpy of formation of Cr2N have been determined to be: ΔH° = −104. ± 10 (KJ. mol−1 Cr2N) ΔG° = −104. + ......
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