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Showing 1 to 20 of 26 for “"Acid leaching"”.
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Acid Leaching of SHS Produced MgO/TiB2
… (TiB₂) and MgO as final products. Selective acid leaching is used to remove the MgO leaving high purity TiB₂ powder. The SHS method to produce TiB₂ is attractive because of the relatively low temperature required to initiate the reaction, fast reaction time, and product purity. This study …
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The effect of solute size distribution on the roasting and leaching of a complex sulfide ore
… particle size distribution on the roasting and leaching of a complex sulfide ore. The effect of pulp density in the leaching process has also been studied. The oxidizing roast of the combined sulfide concentrates, prepared by bulk sulfide flotation and tabling, was conducted with a fluidized-bed …
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Characterization and chronology of refractory inclusions (CAIs) in the CV3 chondrite NWA 4502
… significant imprint of terrestrial weathering. Acid leached residues of NWA 4502 CAI fractions yield a Pb-Pb age (4567.40 ± 0.27 Ma) and initial 87Sr/86Sr (0.698886 ± 0.000026) and an average initial 26Al/27Al (4.90 ± 1.51 x 10-5) ratio consistent with values reported for Allende and …
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Characterization and chronology of refractory inclusions (CAIs) in the CV3 chondrite NWA 4502
… significant imprint of terrestrial weathering. Acid leached residues of NWA 4502 CAI fractions yield a Pb-Pb age (4567.40 ± 0.27 Ma) and initial 87Sr/86Sr (0.698886 ± 0.000026) and an average initial 26Al/27Al (4.90 ± 1.51 x 10-5) ratio consistent with values reported for Allende and …
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ΒΕΛΤΙΣΤΟΠΟΙΗΣΗ ΤΗΣ ΕΚΧΥΛΙΣΗΣ ΛΑΤΕΡΙΤΩΝ ΜΕ ΘΕΙΙΚΟ ΟΞΥ
THE ATMOSPHERIC PRESSURE LEACHING OF NICKELIFEROUS LATERITES BY SULFURIC ACID IS AN ALTERNATIVE METHOD TO THE HIGH PRESSURE LEACHING. TWO TYPES OF ORES WERE STUDIED (SERPENTINIC, HEMATITIC) AND THE INFLUENCE OF VARIOUS PARAMETERS LIKE LEACHING TEMPERATURE, ACID CONSUMPTION, PULP DENSITY, PREHEATING …
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Vanadium and titanium extraction from titaniferous slag using a roast-leach process
… the roast-leach process which involves roasting, leaching, precipitation, and calcination of the titanomagnetite. The V and steel co-production process entails the smelting of titanomagnetite in the presence or absence of the fluxes. In the presence of flux i.e. the fluxed smelting approach, most …
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Fabrication and Characterization of a Porous Clad Optical Fiber Gas Sensor
… the secondary phase is removed through dilute acid leaching. A non-phase separable glass composition is used for the core region. The properties of the phase separable glass are dependent on the processing conditions and the thermal history of the glass after the porosity has been achieved. …
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Geochemical Flow Modeling
… difference approach for solution. In a sandstone acidizing application, the model showed that several insoluble species can form during HF/HCl acidizing of iv argillaceous sandstones and that the most damaging precipitates can be avoided if the HF /HCl formulation is properly matched to the …
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The effect of conditioning on froth flotation
… the particles, including comminution, oxidation, acid leaching and bacterial pretreatment. Secondary Conditioning is the process whereby prepared particles are rendered hydrophobic or hydrophilic through mixing, control of the environment and contacting with reagents.
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Municipal Solid Waste Incineration (MSWI) Ash Characterization and Physical Concentration
… Additionally, sequential chemical extraction and acid-leaching tests were conducted. The results from this section revealed that carrying out a combination of beneficiation processes using the MSWI-BA sample previously classified into the coarse, middle, and fine-size fractions could lead to …
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Development of Leaching Processes for the Recovery of Rare Earth Elements from Acid Mine Drainage Precipitates
Acid mine drainage (AMD) has been a challenge for mine operators to address and has had significant environmental impacts when there is a failure to address it. Fortunately, there is a regulation in the US that requires the treatment of AMD before water can be discharged into the environment. AMD …
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The determination of mercury and its organo compounds by high performance liquid chromatography-atomic flourescence spectrometry.
… sample was taken and heated with 3 mL of nitric acid and 1 ml of hydrogen peroxide. After cooling down of the digest, 0.5 mL of potassium permanganate solution (60 g.L[-1]) was added and left to react for 30 min to 4 hours following the decomposition of the sample. The excess of potassium …
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Advancing Lithium Extraction from Nevada’s Sedimentary Claystones: Hydrometallurgical Pathways and Sustainability Perspectives
… structural confinement, combined with abundant acid-consuming carbonate gangue and complex mixed mineralogy, renders conventional extraction approaches technically inefficient. This dissertation presents a systematic four-study experimental investigation of lithium extraction from Nevada …
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An Investigation into Cerium Oxidation Under Acidic Conditions
… rare earth elements (REE) is often achieved by acid leaching of mineral concentrates followed by subsequent solvent extraction, to produce individual rare earth metals. Cerium, the most abundant of these elements, is usually the largest component of commercial ores. Demand for less prevalent …
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Unlocking the Rare Earth Elements Potential of Allanite: A Comprehensive Study of Beneficiation and Leaching
… investigation into the beneficiation and leaching of REEs from Wyoming allanite. In the mineral processing phase, density and magnetic separation techniques were optimized. Allanite concentrates achieved TREE recoveries of 70–90%, with mass yields of 10–25%, corresponding to concentration …
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Development of zeolite based acid catalysts for the synthesis of methyl tertiary butyl ether
… industrially from methanol and isobutene over an acidic ion-exchange resin Amberlyst-15. This commercial catalyst, although very active, still suffers from several drawbacks such as thermal instability, acid leaching, and need of a high methanol over isobutene ratio. Zeolites for their higher …
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Influence of particle size and morphology of Pt₃Co/C on the oxygen reduction reaction
… were subjected to annealing at 900 °C and acid leaching. The catalysts were analysed using electrochemical characterisation techniques such as cyclic voltammetry, CO stripping voltammetry, rotating disk electrode and rotating ring disk electrode. Physical characterisation of the catalysts …
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Deportment of radionuclides in copper concentrate from Olympic Dam
… raw ore material, flotation concentrate, and acid-leached concentrate provided by BHP Olympic Dam. A qualitative RN budget has been created, prioritising minerals which contain significant RNs but also including unexpected minor host minerals and surficial adherence. Four manuscripts have …
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Direct oxidative Ammonia-Ammonium salt leaching of sphalerite concentrate from the Gamsberg Mine and study of the catalytic effect of Cu(II) on Zinc extraction
… friendly to process with conventional sulfuric acid leaching techniques. The analysed concentrate consists of 43.7 wt.% Zn, 0.17 wt.% Cu, 8.3 wt.% Fe, 29.1 wt.% S, 3 wt.% Pb, 2.4 wt.% Mn, and 5.4 wt.% Si, with mineralogical components including sphalerite (81.2 wt.%), galena (3.2 wt.%), quartz …
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