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Showing 1 to 20 of 33 for “"leaching experiments"”.
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Assessment of Gross Accumulation and Leaching Characteristics of Heavy Metals in a Contaminated Urban Soil
… with anomalous levels of metals. However, the leaching experiments, although limited in scope, suggested that similar soils would not leach heavy metals appreciably. Moreover, remediation efforts should be directed towards increasing vegetation coverage on the bare soils that characterize many …
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On the leaching behavior of uranium-bearing resources in carbonate-bicarbonate solution by gaseous oxidants
… method of extraction is developed. Alkaline leaching of uranium from limestone media has been practiced extensively in the past; however, cutting-edge research during the last 20 years has been rather meager. The research reported in this thesis is an investigation into the use of an …
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Evaluating the Leachability of Elements from Residuals Generated by Hydraulic Fracturing in Marcellus Shale
… used to determine overall elemental composition. Leaching experiments were performed with de-ionized water and acetic acid (0.57%, pH 2.88) in an attempt to respectively evaluate the effects of weak and strong fluids that might be encountered by the residuals in landfill environments. Elements …
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Iron Reduction in Soot
… in the tailpipe of a vehicle. Aqueous leaching experiments of soot-hematite mixtures were carried out while analyzing for Fe(II) spectrophotometrically, and changes in Fe(II) concentrations were then investigated in the context of soot characteristics, including surface area, surface …
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The effect of a magnesia based additive on fly ash depostition in a chain-grate boiler system.
… through a series of laboratory based Surface leaching experiments of deposit and particulate samples with and without injection of Lycal 93HS. The variation in concentration profiles of silicon, iron and magnesium within the collected solutions over a period of time were analysed, using Atomic …
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Investigation of the assessment and remediation of land contaminated with heavy metals
… the success of remediation strategies. Column leaching experiments, with EDTA, were set up to simulate soil-flushing technologies. Soil was extracted using the BCR procedure both before and after treatment. The experiments highlighted the need to consider the soil characteristics when …
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Evaluating Leachability of Residual Solids from Hydraulic Fracturing in the Marcellus Shale
… operations in the Marcellus Shale to predict the leaching behavior of select elements in disposal environments. Samples collected for this research were: (1) drilling mud, (2) treated sludge from the chemical treatment of process waters, (3) solids from the gravity settling of produced water, and …
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Hydrometallurgical processing of nickel sulfides with activated carbon in sulfuric acid medium
… the tailings was investigated throughsystematic leaching studies using inorganic acids, organic ligands, and oxidizing agents. The initial leaching experiments established that effective metal dissolution requires strongly acidic and oxidative environments. Sulfuric acid was selected as the …
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Rare metal resources in polymetallic nodules from the Eastern Equatorial Pacific Ocean
… mineral phases in the nodules. Sequential leaching experiments using dilute acetic acid, HCl, oxalic acid and concentrated nitric acid revealed that ~60% of REYs are hosted in the interlayer spacings of the phyllomanganates while less than 7% are hosted in the amorphous FeOOH phase compared …
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Predicting radioactive waste glass properties with machine learning and modelling
… numerous glass dissolution and characterisation experiments have been performed by the nuclear industry, which currently vitrifies its high-level radioactive waste (HLW), ultimately in preparation for deep geological disposal. This data has largely been collected in isolation, and there has been …
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Multi-scale analysis of 6PPD-quinone: distribution, environmental risk, and urbanization influence in the Delaware River Basin
… ecological risk, urbanization impact and leaching dynamics of 6PPDQ across two major urban watersheds: the Schuylkill River and the Delaware River Basin both vital for drinking water supply and ecological integrity. Field sampling was conducted across 16 sites in the Schuylkill River and …
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Hydrogeochemical Evaluation and Impact of Remediation Design on Arsenic Mobility at Historical Gold Mine Sites
… hydraulic conductivity measurements. Laboratory leaching experiments were used to assess the effects of a soil cover on the tailings. Variable weathering conditions over time have resulted in a continuum of saturation and redox environments and a range of As hosts in the tailings. In some areas, …
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Electrochemical study of gold thiosulfate extraction process
… Corporation has commercialized thiosulfate gold leaching process in Goldstike mine in Nevada, USA. However, there is still potential for technical improvements to achieve higher process efficiency. The purpose of this study is to examine gold thiosulfate leaching chemistry and to suggest …
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Geochemical and Isotopic Characterization of Coal Combustion Residuals: Implications for Potential Environmental Impacts
… of boron and strontium isotopes of CCRs from leaching experiments and their application as tracers in the environment of the TVA spill and NC waterways. These investigations have illuminated several conclusions, including contact of surface water with CCRs leach high concentrations of …
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Hydrologic and hydrochemical processes on mine spoil fills
… infiltration and dye staining tests, mine spoil leaching experiments and modeling, and mining-influenced stream discharge monitoring. Results indicate that many factors influence hydrologic and hydrochemical processes in Appalachian coal mining areas, but these processes evolve over time as …
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Deep Eutectic Solvents for the Leaching of Cobalt from Oxide Ores
… to be liberated. Given this property, subsequent leaching experiments centred around the use of Type III ChCl-based DESs composed of carboxylic acids, which serve as reducing/complexing agents, and therefore likely to exhibit a propensity for selective Co dissolution. Batch leaching tests were …
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Geochemical modeling-based prediction of water-rock interaction during aquifer storage and recovery utilizing selected Colorado Front Range aquifers
… of mineral precipitation. In addition, benchtop leaching experiments were performed on rock samples to provide additional information about potential water-rock interaction. Benchtop experiment results are presented, but the focus of the study is primarily on geochemical modeling results. Water …
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Mineralogical and ion-exchange leaching study of a Rare Earth Element (REE) bearing ion-adsorption clay deposit
… electron microscopy (TEM). The geochemical leaching characteristics of the clay mineral were investigated using a sequential leaching program, targeting ion-exchangeable REE on kaolinite, halloysite, REEorganic matter and mineral phase. Ammonium sulphate leach experiments were conducted, …
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Petrological and geochemical studies of an abyssal periodotite from the Atlantis II fracture zone
… in the abyssal peridotites, as shown in leaching experiments, and the melt is saturated in sulfur as a consequence of the reaction process, it is possible to model the heterogeneous distribution of the Os isotopic data by mixing the residual peridotite with 0.2 to 0.5 wt% of sulfides …
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Synthesis of zeolites and their application as soil amendments to increase crop yield and potentially act as controlled release fertilizers.
… release fertilizers to decrease nitrate leaching. Nitrate pollution of groundwater is a major agro-environmental concern. The zeolites Phillipsite and Linde-type F were synthesized from aluminosilicate gels; ion exchanged to introduce ammonium and characterized using X-ray diffraction …
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