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Effect of biochemical reactions in enhancement of rate of leaching
Chemical Engineering Science, 2004Abstract Microbial dissolution of metals involves direct adhesion/attack of the bacterial cell on the sulfide surface and/or allowing chemical oxidation of liberated sulfides by ferric iron generated microbially or through oxidation by air. The prolonged recycling of Fe 2 + / Fe 3 + couple by the bacterium is essential to keep an ...
Bharathi Kodali +3 more
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ICP measurements of leach rates of waste glasses
Nuclear and Chemical Waste Management, 1981The long-term management of the high-level radioactive wastes from the reprocessing of irradiated nuclear fuel seems to be the critical point concerning the nuclear fuel cycle. The solid forms, discussed for the storage of this waste, range from calcines, glasses, and ceramics to SYNROC.
Reinhard Odoj, Erich Merz
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Enhancement of the Leaching Rate of Uranium in the Presence of Ultrasound
Industrial & Engineering Chemistry Research, 2006In the present work, experiments have been performed for leaching (recovery) of uranium from MgF 2 (byproduct from the uranium ore recovery process) under various conditions of leach acid concentration with and without the presence of ultrasound, under different energy dissipation rates (different rotational speeds of conventional stirring by impeller)
Balasubrahmanyam Avvaru +4 more
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Effect of chloride ions on leaching rate of chalcopyrite
Minerals Engineering, 2010Abstract The effect of chloride on chalcopyrite leaching has been investigated by performing batch leaching tests with three kinds of leaching solutions and using Hiroyoshi’s model, which suggests that a zone of rapid leaching exists between the critical potential (Ec, equilibrium redox potential for the reduction of CuFeS2 to Cu2S) and the oxidation
Kyoungkeun Yoo +5 more
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Water-leaching rates of halides from polymers
Journal of Applied Polymer Science, 1982Water-leaching experiments of halides from polymers were carried out in batch and continuous systems. The effects of flow rate, temperature, and salt content on the leaching kinetics were investigated. Different thermoplastic polymers were used as the salt carrier, and the release kinetics from them was established. NaCl, NaBr, and NaI were leached out
Nava Narkis +2 more
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The rate of biocide leaching from porous renders
Chemical Engineering Research and Design, 2018Abstract The leaching of biocides contained in renders occurs through the contact of the surfaces of the renders with water. In the majority of cases such contact occurs during rainfall, and therefore it is intermittent in nature. The work presents a mathematical model of the process of the transfer of mass (biocides) in a porous material (a render).
Katarzyna Styszko, Krzysztof Kupiec
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LEACHING RATES OF ICEL-YAVCA DOLOMITE IN HYDROCHLORIC ACID SOLUTION
Mineral Processing and Extractive Metallurgy Review, 2007Experiments were performed in aqueous hydrochloric acide (HCl) solutions over the bulk solution pH − 0.01 to 0.71 and at temperatures of 25, 40, 50, 70, and 85°C. Variation of the dissolution recoveries, temperature, and pH with the time were studied. The logarithms of the chemical dissolution rates (r) obtained at constant hydrodynamic conditions for ...
Akarsu H., Yildirim M.
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Effect on Leaching on Pine Litter Decomposition Rate
Ecology, 1969Leached pine needles have a much higher decomposition rate than unleached ones. Under laboratory conditions, the measurement of carbon dioxide production yields a close estimate of decomposition rate as measured by weight loss.
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