Kinetics of the Oxidation of Galena In Ammonium Acetate Solutions Under Oxygen Pressure

JOM ◽  
1956 ◽  
Vol 8 (8) ◽  
pp. 1096-1099
Author(s):  
D. P. Seraphim ◽  
C. S. Samis
Keyword(s):  
Oxygen Pressure ◽  
Ammonium Acetate ◽  
Kinetics Of

scholarly journals Investigation of the use of ammonium acetate as an alternative lixiviant in the leaching of malachite ore

2013 ◽  
Vol 19 (1) ◽  
pp. 25-34 ◽  
Author(s):  
Asım Künkül ◽  
Abdulvahap Gülezgin ◽  
Nizamettin Demirkiran
Keyword(s):  
Ammonium Acetate ◽  
Solution Concentration ◽  
Copper Extraction ◽  
Leaching Rate ◽  
Selective Leaching ◽  
Liquid Ratio ◽  
Copper Ore ◽  
Experimental Parameters ◽  
Leaching Reaction ◽  
Kinetics Of

The solutions containing ammonia allow for selective leaching of the copper from a copper ore. In this study, the leaching and kinetics of malachite ore were examined using ammonium acetate solutions as an alternative lixiviant. The effects of some experimental parameters on the leaching of malachite ore were investigated. A kinetic model to represent the effects of these parameters on the leaching rate was developed. It was determined that the leaching rate increased with increasing solution concentration, temperature and stirring speed, and decreasing particle size and solid-to-liquid ratio. It was found that the leaching reaction followed the mixed kinetic control model. The activation energy of this leaching process was determined to be 59.6 kJmol-1. Consequently, it was determined that ammonium acetate solutions could be used as an effective leaching agent for the copper extraction form malachite ore.

scholarly journals Kinetics of photocatalytic oxidation of phenol on CuO-TiO2 at high oxygen pressure

2016 ◽  
Vol 31 (3) ◽  
pp. 68-75
Author(s):  
F.F. Orudzhev ◽  
◽  
A.B. Isayev ◽  
F.G. Gasanova ◽  
N.S. Shabanov ◽  
...  
Keyword(s):  
Oxygen Pressure ◽  
Photocatalytic Oxidation ◽  
High Oxygen ◽  
High Oxygen Pressure ◽  
Oxidation Of Phenol ◽  
Kinetics Of

The Kinetics of Oxygen Delignification of Reed Kraft Pulp (I)-Kinetics of Delignification

2011 ◽  
Vol 236-238 ◽  
pp. 1420-1424
Author(s):  
Xiao Feng Pan ◽  
Le Fan Ma ◽  
Qin Qin Qu ◽  
Jia Liang Lan ◽  
Li Hong Tan
Keyword(s):  
Activation Energy ◽  
Reaction Time ◽  
Oxygen Pressure ◽  
Kraft Pulp ◽  
Reaction Order ◽  
Frequency Factor ◽  
Kappa Number ◽  
Alkali Concentration ◽  
Oxygen Delignification ◽  
Kinetics Of

The kinetics of reed kraft pulp oxygen delignification process is studied, suitable kinetics model determined is -dk/dt=Aexp(-E/RT) [OH-]b[PO2]cKa, and the parameters in the model is calculated. The function for estimation of the kappa number at different reaction time is established for the reed kraft pulp oxygen delignification process. The reaction order fitted is 6.72 for delignification (a), 0.87 for alkali concentration (b), and 0.62 for oxygen pressure(c), respectively. The activation energy E is 80.96KJ/mol and frequency factor A 1.5×104.

Racemization Kinetics of Aspartic Acid in Fish Material under Different Conditions of Moisture, pH, and Oxygen Pressure

1999 ◽  
Vol 47 (7) ◽  
pp. 2879-2884 ◽  
Author(s):  
Umberto Luzzana ◽  
Tiziana Mentasti ◽  
Johannes Opstvedt ◽  
Einar Nygård ◽  
Vittorio M. Moretti ◽  
...  
Keyword(s):  
Aspartic Acid ◽  
Oxygen Pressure ◽  
Kinetics Of

THE KINETICS OF METABOLISM OF GIBBERELLA FUJIKUROI IN STIRRED CULTURE

1964 ◽  
Vol 10 (3) ◽  
pp. 407-444 ◽  
Author(s):  
A. Borrow ◽  
Sheila Brown ◽  
E. G. Jefferys ◽  
R. H. J. Kessell ◽  
Eithne C. Lloyd ◽  
...  
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Nitrogen Uptake ◽  
Exponential Growth ◽  
Ammonium Acetate ◽  
Specific Growth ◽  
Dry Weight ◽  
Gibberella Fujikuroi ◽  
Ammonium Tartrate ◽  
Kinetics Of

Some aspects are described of the kinetics of the growth of Gibberella fujikuroi in nitrogen-limited media containing either ammonium nitrate, ammonium acetate, ammonium tartrate, urea, or glycine. Also varied were inoculum size, agitation rate, pH, and initial concentrations of glucose and nitrogen source. The significance of kinetic parameters used in this, and published studies, is discussed.A lag phase was only found on ammonium acetate media or when high concentrations of glucose were present. Early growth was exponential on all nitrogen sources. On ammonium acetate the specific growth rate decreased at a dry weight of ca. 1 mg/g WS (Whole unfiltered Sample). On ammonium nitrate, early exponential growth utilized more NH3-nitrogen than NO3-nitrogen with a concomitant decrease in pH. In the range pH 3.0–2.8 NH3-nitrogen uptake and dry weight increase ceased, but NO3-nitrogen uptake continued, and the pH increased until growth and NH3-nitrogen uptake restarted. This pattern could be repeated. Finally, exponential growth was resumed at a low specific growth rate. On glycine, urea, and ammonium tartrate media, exponential growth continued to a dry weight of about 7 mg/g WS. During this period the uptakes relative to dry weight (contributions) of glucose, nitrogen, phosphate, and magnesium remained constant and were unaffected by the rate of agitation, as also was the specific growth rate, but the latter decreased with increasing glucose concentration.A period of linear growth could follow the exponential period. The contribution of glucose was greater, and that of phosphate and magnesium less, than during exponential growth. The dry weight at which exponential growth changed to linear growth was greater the higher the rate of agitation, and this change may be a response to oxygen restriction.After nitrogen exhaustion, fat and carbohydrate accumulation in the cells largely accounted for the increase in dry weight. The specific rates of dry weight increase and glucose uptake remained constant over the lower range of initial nitrogen concentrations. Both rates decreased with increasing nitrogen over the higher range.Gibberellic acid production began at, or soon after, nitrogen exhaustion. The amount present increased linearly with time. The productivity decreased with increasing glucose concentration, and first increased and then decreased with increasing initial nitrogen. The maximum amount produced was proportional to the initial nitrogen provided. Some published results are discussed in the light of these relations.

Kinetics of the Ammonium Acetate-Catalyzed Condensation of Vanillin and Nitromethane1

1951 ◽  
Vol 73 (5) ◽  
pp. 2268-2270 ◽  
Author(s):  
Thomas I. Crowell ◽  
Fausto A. Ramirez
Keyword(s):  
Ammonium Acetate ◽  
Kinetics Of
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