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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 77 for “"Rougher"”.
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Multivariable control of a rougher flotation cell
… evaluation of a closed loop control system on a rougher flotation cell that could improve PGM flotation performance. A PGM rougher flotation cell equipped with Online Stream Analysis (OSA) and machine vision system (SmartFroth) was used during the investigation. Online measurements included …
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Desarrollo de un Sensor Virtual de Ley de Concentrado Rougher en Planta Las Tórtolas
… para determinar la ley de cobre del concentrado rougher en la Planta concentradora Las Tórtolas, perteneciente a la Compañía Minera Anglo American Chile. Para la determinación de los modelos que componen el sensor virtual, se emplearon dos períodos de muestreo, que se obtuvieron desde el registro …
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Developing a framework for the design of the milling and rougher circuits for a platinum-bearing UG2 ore
In the western limb of the Bushveld Igneous Complex, platinum is mined predominantly from two reefs – Merensky and UG2. Most of the platinum group minerals (PGM’s) in Merensky ore are associated with base metal sulphides (BMS), and thus Merensky concentrators will usually resemble simple BMS …
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Optimization of a Copper/Molybdenum Flotation Circuit by Depressing Pyrite from the Rougher Flotation Stage Using Different Scheme of Reagents
… pyrite, other than the specific use of lime, in rougher flotation was conducted. Specifically, the goal was to determine an effective alternative to pH adjustment using lime. Experiments were conducted using the most common selection of reagents: xanthate and lime to recover copper and reject …
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The Application of Mineral Processing Techniques to the Scrap Recycling Industry
… circuits used in the locked cycle test were a rougher-cleaner, a rougher-scavenger, and a rougher-cleaner-scavenger. It was found that it is possible to use tree analysis to compare different eddy current separator circuits using the same settings, however standards for this practice need to be …
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A STUDY ON PARTICLE SURFACE ROUGHNESS AND ITS IMPACT ON TABLET AND INHALER TECHNOLOGY
… particles of different surface roughness. Rougher particles had higher rearrangement energy requirement during tableting, decreasing the energy available for bond formation. The effects of roller compaction on materials of different deformation properties were examined. Roller compaction of …
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The development of frother optimisation techniques in full scale flotation plants
… tank cells. Technique 1 involved using the first rougher cell on a flotation plant, dosing frother at different rates into the cell to target different frother concentrations and then measuring the resultant bubble size whilst operating at a fixed air rate. The coalescence mechanism here was …
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Surface conditions effect on energy exchange at the soil surface
… of short wave radiation decreased with rougher soil surfaces. Reflectance increased about 25% after the soil surfaces had been smoothed by a 4.7 cm rainfall. Net radiation was increased on the rougher soil surfaces. Soil temperature measured at 0.01-, 0.05-, and 0.15-m depths were higher …
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Evaluación del uso de NaSH en el circuito de flotación selectiva de molibdeno de Los Pelambres
… uso de sulfhidrato de sodio (NaSH) en la etapa Rougher de la flotación selectiva de molibdeno, planteando y desarrollando alternativas que permitan una reducción en el consumo de este reactivo. Para ello se realizó un estudio del proceso de la Planta de Molibdeno que permitió determinar los …
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A Model of Precipitation Rates in Kentucky, 1965-1996
… away. As a precipitation event moves over rougher terrain and more urbanized areas, precipitation rates decrease as well. A rougher terrain absorbs more solar radiation because it has more surface area. An urbanized area absorbs more solar radiation because of the urban structures (e.g., …
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Copper Surface Chemistry Relevant to Chemical Mechanical Planarization (Cmp)
… from TAZ were thicker, more permeable, and rougher than films formed from BTA. The addition of glycine to these solutions showed an increase in corrosion for the TAZ-covered surface, little change to the BTA-covered surface, and an increase in removal for both systems. This study correlated …
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Thackeray's Moral Landscape: The Aesthetic Principles of William Makepeace Thackeray
… Esmond, Clive Newcome, Pendennis, and, in a rougher form, George Osborne and Rawdon Crawley, must choose between women who are presented to them and the reader as different types of art works. The "sublime" women, Becky Sharp and Beatrix Esmond, affect the men as would a sublime …
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Investigation of intermediate layer for Ag/Si metal-semiconductor contacts
… deposition time. The surface of Pt/Ag becomes rougher as deposition time increases. As deposition time increases, the resistivity shows some decrement. However, the fluctuated of resistivity may due to surface roughness scattering mechanism. The lowest resistivity was 6.29 × 10-3 Ω-cm deposited …
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The Fracture Behavior and Mechanical Performance of Biodegradable Cornstarch Plastic Composites
… meaning that as the fracture surfaces appear rougher and more characteristically like ductile fractures, the stronger, more ductile and tougher the materials.
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Characterizing Flotation Response: A Theoretical and Experimental Comparison of Techniques
… flotation cells using various combinations of rougher, cleaner, and scavenger configurations. Although some of these procedures have been experimentally compared, there remains considerable controversy as to which approach best approximates the ideal flotation response. In this investigation, …
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The role of fluoride in the adherence of electrodeposited zinc to aluminum cathodes
… increased and the surface of the aluminum was rougher after zinc stripping, illustrating that the higher adherence of zinc was due to increased chemical and physical bonding of zinc to aluminum substrate. Even in solutions containing low fluoride, the cyclic usage of an aluminum cathode showed …
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Micromechanisms of polymer sliding wear
… wear rates than the unfilled material on the rougher counterface. The filled material was also found to be more sensitive to a change in Rₐ and showed higher wear rates than the unfilled polymer on the smooth counterface. A uniform and coherent transfer film is found on the rougher counterface …
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Learning boiling properties of materials
… our intuition that larger particles result in rougher surfaces. However, this effect does not propagate forward to the surface’s boiling properties, as the cavity features are not predictive of boiling curve coefficients. We hypothesized that this discrepancy arose because most cavities are not …
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Exoskin : pneumatically augmenting inelastic materials for texture changing interfaces
… as the car moves from congested city driving to rougher rural roads. Finally, we introduce the idea of membrane-backed rigid materials as a broader, more versatile platform for introducing texture change and sensing into a variety of other products as well. By deeply embedding soft materials with …
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Morphological differentiation of eggs and comparative efficacy of oviposition and gravid traps for Aedes vectors at different habitats
… eggs were larger, lighter in color, and have a rougher appearance when compared to Ae. japonicus. Ae. albopictus and Ae. aegypti can be differentiated by the distinct presence of a micropylar collars in Ae. aegypti. Ovitrap and gravid trap efficacy for the surveillance of Ae. triseriatus, Ae. …
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