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Showing 1 to 8 of 8 for “"mixed flow reactor"”.
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Kinetics of Arsenopyrite Oxidative Dissolution by Oxygen
The objective of this study is to use a mixed flow reactor system to determine the dissolution rate and infer potential mechanisms of arsenopyrite (FeAsS) oxidation by dissolved oxygen at 25°C and circumneutral pH. Release rates for iron, arsenic and sulfur are calculated for a variety of initial …
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Effect of aluminum oxyhydroxide coatings on the performance of limestone drains
… (H+) derived from acid mine drainage. I used mixed flow reactor experiments to investigate the effect of Al coatings on the diffusion of H+ to the surface of limestone and to quantify how those Al coatings affect the limestone dissolution rate. Experiments used acidic Al sulfate solutions with …
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3D Printing of Specialty Devices for Geochemical Investigations: Real-Time Studies of Goethite and Schwertmannite Formation
New types of laboratory reactors that are highly customizable, low-cost and easy to produce are needed to investigate low-temperature geochemical processes. We recently showed that desktop 3D printing stereolithography (SLA) can be used to efficiently fabricate a mixed flow reactor (MFR) with high …
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The rates of oxidation of galena and sphalerite in acidic ferric chloride solutions
… sulfate. The experiments described here used a mixed flow reactor system to determine the oxidation rates of galena and sphalerite under conditions similar to that expected in a weathering ore deposit . The specific surface area of the run solids was determined by N₂ BET procedure and the …
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The Leached Layer Formed On Wollastonite In An Acid Environment
… were carried out in a fixed-bed external recycle mixed flow reactor to measure the rate of dissolution and the development of a leached layer on wollastonite. Each experiment ran for approximately 24 hours and the release rates of Si and Ca in the interval from 14 to 24 hours were analyzed. Each …
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Establishing the Physical Basis for Calcification by Amorphous Pathways
… not been established. This study utilized a new mixed-flow reactor (MFR) procedure to synthesize ACC from well-characterized solutions that maintain a constant supersaturation. The experimental design controlled the input solution Mg/Ca ratio, total carbonate concentration, and pH to produce ACC …
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Geochemical Investigations of Respirable Particulate Matter
… constituents derived from the particles. A mixed flow reactor was used to evaluate two applications of geochemical methods to characterize the behavior of inhaled particles in the body. Dissolution rates of a well-characterized sample of powdered talc were measured in solvents that mimic …
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Thermodynamic and kinetic studies of sulfur geochemistry
… over the pH range 2-10. A series of batch, and mixed flow reactor experiments were performed to determine the effect of SO₄²⁻, Cl⁻, ionic strength and dissolved oxygen on the rate of reaction of pyrite with ferric tron. Only dissolved oxygen was found to have any appreciable effect. The results …