Results 261 to 270 of about 46,223 (311)
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A Mechanically Controlled Variable Rate Leaching Device
Soil Science Society of America Journal, 1977Abstract Twenty‐four leaching tubes attached to 60‐ml plastic syringes are mounted on the periphery of three vertically aligned slotted discs 45 cm in diameter. The plungers are withdrawn at a controlled rate by a variable speed screw jack that separates the two lower discs holding the plungers and syringe barrels, respectively ...
George G. S. Holmgren +2 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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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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The measurement of leach rates: A review
Nuclear and Chemical Waste Management, 1982Abstract A historical perspective of the techniques that can be used to measure the leach rate of radioactive waste forms is presented. The achievement of leach rates that are as low as possible has been an important goal ever since the development of solidification processes for liquid radioactive wastes began in the 1950's.
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Minimal Extractant Flow Rate in Countercurrent Leaching
Theoretical Foundations of Chemical Engineering, 2005Approaches to determining the minimal extractant flow rate in countercurrent leaching are considered.
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Radiation effects and the leach rates of vitrified radioactive waste
Nature, 1982There is much concern that long-lived radioactive elements incorporated in glasses for the disposal of highly active nuclear waste might eventually return to the environment. The most important mechanism begins with leaching of the glass by groundwater and a leach rate, usually based on laboratory tests of simulated vitrified radioactive waste, has ...
W G, Burns +4 more
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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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The Modeling and Control of Leaching Rate in Nickel Stir Leaching Process of Sulfuric Acid
Advanced Materials Research, 2012Leaching rate is one of the key parameters in the nickel stir leaching process of sulfuric acid and it is hard to online measure directly due to a lot of uncertain facts. In this paper, the prediction model of nickel leaching rate is established by least squares identification method.
Qiang Li +3 more
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Fertigation rate, leaching fraction, and growth of potted poinsettia
Journal of Plant Nutrition, 1996Single-pinched poinsettia (Euphorbia pulcherrima 'V-14 Glory') in 15-cm pots received constant fertigation with 50, 100, 200, and 300 mg.L -1 nitrogen (N) from a 20N-4.4 phosphorus (P)-16.6 potassium (K) fertilizer with a leaching fraction (LF) of 0, 0.2, or 0.4. Plants received 25 irrigations during the 13-week study.
Catherine Ku, David Hershey
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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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