Annual Meeting Preliminary Program - Full Brochure (PDF) - SME

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These studies over the years resulted in some significantly improved process alternatives, more effective slime dispersants and better desliming equipments. However, the overall slime effect still remains to be one of the most important aspects of the overall flotation separation of minerals. In this article, a review of the overall slime problem in flotation has been made based on past accomplishments and present new developments. The overall slime problem has been critically examined based on mineralogical characterizations, processing alternatives, available and potential desliming chemicals and equipments. Potential areas for further improvements are identified. 2:25 PM Improving Au recovery from Cu and Cu-Au ores D. Nagaraj; Minerals Processing Chemicals, Cytec Industries, Stamford, CT Over the past decade or so, our efforts have focused on developing the rationale and concepts for new approaches and technology in reagent development and optimization in the processing of base and precious metals. Two major outcomes of these efforts have been new reagents for precious metals recovery in flotation and Flotation Matrix 100 (FM100) which is comprehensive program to facilitate the implementation of a holistic approach to reagent development, selection and optimization in flotation. The new reagents for improving precious metals recovery include collectors and modifiers. An overview will be given using examples to highlight the application of the new reagents and technology in the processing of Cu-Au and Primary Au ores. 2:45 PM Clay Binders for Enhanced Mineral Beneficiation Using Froth Flotation D. Tao 1 , X. Zhou 1 , W. Wang 1 , C. Zhao 1 , M. Aron 2 and J. Wright 2 ; 1 Department of Mining Engineering, University of Kentucky, Lexington, KY and 2 Georgia-Pacific Resins, Inc., Decatur, GA The presence of ultra-fine clay particles is known to have adverse effects on froth flotation performance. This has been attributed largely to slime coatings that inhibit bubble attachment and to adsorption of the frother and/or collector by the clay particles. Therefore, selective agglomeration of clay particles by use of clay binders can be expected to improve the froth flotation performance. In this study, froth flotation tests were conducted to evaluate the effectiveness of clay binding agents in enhancing mineral flotation performance with phosphate, potash, and iron ores. Process parameters investigated included slurry solids percentage, impeller rotation speed, binder dosage, collector dosage, etc. Flotation results show that use of clay binders significantly enhanced flotation efficiency under various conditions. More significant improvements in the process efficiency were observed at higher solids percentage and higher impeller rotation speed. 3:05 PM Chemical enhancement in the magnetic separation of mineral beneficiation S. Ravishankar and A. Gorken; Cytec Industries Inc., Stamford, CT The value creation with kaolin in paper and paint applications depends on higher brightness, achieved by removing the colored impurities. A chemical enhancement technology for magnetic separation has been developed for removing colored impurities from kaolin. Besides, offering the best attributes of flotation and selective flocculation, the technology consumes less chemicals and uses available magnetic separator. The paper will outline the technology and illustrate flexibility on a wide variety of crude, process needs and plant limitations. The major advantages of chemical enhancement technology to magnetic separation include: simple extension to existing magnetic separation technology to produce higher brightness products, ability to produce comparable product in quality with cost effectiveness compared to flotation and selective flocculation, removal of impurity minerals over wide size range, removing non-magnetic impurities, providing robust process with high process yield and operator-friendly nature. Furthermore, the chemical enhancement technology for magnetic separation can be extended to other mineral systems containing valuables or impurities at low levels. 3:25 PM A Multivariate Study of the Influence of Flotation Reagent Interactions on the Froth Phase A. Rojo 1 , D. Nagaraj 2 and S. Vianna 1 ; 1 JKMRC, Indooroopilly, QLD, Australia and 2 Cytec Industries, Stamford, CT Froth phase characteristics are influenced by all of the flotation reagents (Collectors, Frothers, and Modifiers) interacting simultaneously with the physical factors and the various mineral species in the froth phase. Much research has been conducted on two-phase froths (in the absence of solids), but such research has no direct relevance to the three-phase froths in flotation plants. Although collector-frother interactions have been reported in the literature, there is little published on collector-frother-modifier interactions, especially in the three phase systems involving complex mineralogy. A holistic approach is necessary to study and understand these complex interactions. In this paper we discuss the results such as study using batch flotation tests on a Cu-Mo ore. Mineral and Metallurgical Processing: New Tools: Analytical or Devices or Those Emerging from Nanotechnology Part II 2:00 PM • Wednesday, February 27 Chair: M. Free, University of Utah, Salt Lake City, UT 2:05 PM Nanobubble effect on nanoscale interaction between hydrophobic surfaces M. Hampton, B. Donose and A. Nguyen; Division of Chemical Engineering, The University of Queensland, Brisbane, QLD, Australia Although advances in surface science have been tremendous, nanometer scale interactions between hydrophobic surfaces in aqueous solutions encountered in many industrial processes remains one of the greatest challenges, from both experimental and theoretical perspectives. In this paper, friction forces between hydrophobized silica surfaces were measured by atomic force microscopy (AFM). The surfaces were tested to quantify the strength of the van der Waals, electrical double layer and non-DLVO forces. The normal and lateral interaction forces between a silica bead and an atomically smooth silica substrate hydrophobized by esterification with octanol were concurrently measured. Nanobubbles of dissolved gases preferentially accumulated at the surfaces were observed using the AFM tapping mode imaging technique. The surface pre-treatment, specifically the rinsing order with water and ethanol was found to have a significant impact on the dependence of friction force on normal load. The friction dependence on the scan rate was also studied to examine the transient behavior of the nanobubble layer. A mechanism was proposed to explain the observed phenomena. 2:25 PM A Molecular Dynamics Simulation Study of Water Structure and Adsorption States at Talc Surfaces H. Du and J. Miller; Metallurgical Engineering Department, College of Mines and Earth Sciences University of Utah, Salt Lake City, UT A preliminary molecular dynamics simulation (MDS) study regarding interfacial phenomena at talc surfaces is reported. Water organization at face and edge surfaces reveals characteristic features which distinguish the naturally hydrophobic surface state from the hydrophilic state. Further, simulation results show that the hydrophobic chains of the cationic surfactant, dodecyl trimethyl ammonium bromide (DTAB), preferentially adsorb at the talc basal plane surface through hydrophobic interactions. On the other hand, the DTAB cationic surfactant adsorbs at the talc edge surface through electrostatic interactions. Finally, when a model dextrin molecule is considered, it was found that the hydrophobic interactions play a significant role in dextrin adsorption at the talc face surface. Whereas, at the talc edge surface the dextrin molecule is not able to displace interfacial water molecules. 2:45 PM Particle Characterization of Phosphate Flotation Feed and Products L. Hupka, C. Lin, M. Al-Wakeel, J. Nalaskowski and J. Miller; Metallurgical Engineering Department, College of Mines and Earth Sciences University of Utah, Salt Lake City, UT Phosphate flotation recovery and product grade vary considerably with respect to the feed quality. As in any flotation process the efficiency of separation may be determined by many different feed characteristics all of which may influence product grade and recovery. Phosphate flotation is no exception. These feed characteristics include liberation, slimes content, and surface chemistry features, to mention a few important factors. The significance of these factors on recovery are discussed for variations in phosphate flotation feed material. 60
3:05 PM New innovations in on-stream analysis for flotation circuit management and control M. Kongas and K. Saloheimo; Outotec Oyj, Espoo, Finland Over the years on-stream XRF analyzers have become more sophisticated. They have been integrated with controlled sampling systems, operator does not need to manually change windows, WD and ED channels can be used in the same analyzer for best analytical performance. Operator interface is much more user friendly. 3:25 PM Direct measurement of particle-bubble interaction forces using atomic force microscopy S. Assemi 1 , A. Nguyen 2 and J. Miller 1 ; 1 Department of Metallurgical Engineering, University of Utah, Salt Lake City, UT and 2 Division of Chemical Engineering, The University of Queensland, Brisbane, QLD, Australia Important industrial processes such as froth flotation and wastewater treatment rely on complicated particle bubble interactions. In this work interaction forces between a hydrophilic silica particle and an air bubble were measured by atomic force microscopy (AFM) for simplified model systems using deionized water and dilute electrolyte solutions. In each measurement, a captive bubble with a diameter of ~700 microns was formed on a graphite surface and slowly brought into contact with a fine silica sphere glued to an AFM cantilever. Contribution of hydrodynamic force was minimized by using a low piezo speed. Particle-bubble separation distance and bubble spring constant were calculated from linear regression of the piezo extension versus cantilever deflection. The measured forces were compared with the Hogg-Healy-Fuerstenau approximation for colloid forces, using the surface element integration method. Dependence of the particle-bubble interaction forces on the maximum applied force, particle size, and position of the particle relative to the bubble were investigated. The measured forces were influenced by the local deformation of the bubble surface. Mining & Exploration: Excavators & Heavy Equipment 2:00 PM • Wednesday, February 27 Chair: M. Cigla, Colorado School of Mines, Golden, CO 2:05 PM Field Studies and Laboratory Cutting Tests for Performance Prediction of Chain Saw Machines H. Copur, C. Balci, N. Bilgin, D. Tumac and I. Duzyol; Mining Engineering, Istanbul Technical University, Istanbul, Turkey Preliminary results of a project supported by TUBITAK (The Scientific and Technological Research Council of Turkey) are presented in this paper. Parameters affecting net cutting rate and tool wear rate of chain saw machines used for extraction of natural stones are summarized. Field measurements on net cutting and tool wear rates of chain saws are also summarized. Block natural stone samples are obtained from quarries in Turkey to perform a set of full-scale laboratory linear rock cutting tests using chain saw cutting tools to determine cutting characteristics of chain saw machines and sample cuttability, in addition to some physical and mechanical property tests. Full-scale laboratory linear rock cutting tests result in tool forces and specific energy to cut a unit volume of rock. Full-scale cutting tests can be used to define optimum cutting configuration for a certain stone type by reducing torque and thrust requirement of the machine, thus increasing machine performance. 2:25 PM Development and Evaluation of an Automated Waterjet Scaling System M. Kuchta and G. Ross; Mining Engineering, Colorado School of Mines, Golden, CO Water-jet scaling is an emerging technique used for removing loose rock from mine openings. Automation has the potential to improve the effectiveness of the operation. An automation system was added to an existing rig and used to sweep the water-jet across the surface to be scaled. The major components of the system developed include position sensors, electronic (solenoid) valves on each hydraulic actuator, adjustable valve throttles, an amplifier board, a DAC/ADC board (a Labjack U12) to drive each amplifier channel and read voltage from position sensors, a personal computer, and automation software. System details and field trial results are discussed. 2:45 PM Application of the Topsis Method to Solve Hydraulic Excavator Selection Problem in Mining M. Yavuz; Mining Engineering Department, Eskisehir Osmangazi University, Eskisehir, Turkey Decision-Making (DM) is the first and one of the most important stages in the design or project procedure of mining engineering operations like other engineering professions. Every mining engineer might make precise decisions in all mining operations. There are a number of techniques available for solving different type of decision problems in the literature. In this paper, the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS), which is the one of the Multiple Attribute Decision Making (MADM) techniques. As the decision in the equipment selection has radically influenced the economic life of any mining scenario, they are considered as complex MADM problem. After introducing the Multiple Criteria Decision Making (MCDM)methods, the TOPSIS method and its algorithm were explained in this paper shortly. The TOPSIS has not been extensively used to model decisions pertaining to the mining applications although most often it has been used for DM on corporate level. The TOPSIS method was used for a Hydraulic Excavator selection by considering the data obtained from magnesite industry in Turkey. 3:05 PM Virtual Dump Truck Simulation for Efficient Haul Road Engagement S. Frimpong 1 and Y. Li 2 ; 1 Mining Engineering, University of Missouri-Rolla, Rolla, MO and 2 Mining Engineering, University of MIssouri-Rolla, Rolla, MO Samuel Frimpong and Ying Li Abstract The interaction of dump truck and haul road has been simulated with the dynamic model established in this work by combining the multi-body and soil dynamics with the Automatic Dynamic Analysis Mechanical Systems (ADAMS) software. Mathematic models governing the interaction of the dump truck with the haul road have been modeled based on the theory of multi-body and soil dynamics. These models consist of the tire-haul road contact model for generating the contact force between road and tire, finite element (FE) tire model for calculating the stress distribution, and load-deformation road model for capturing the dynamic behavior of haul road. A virtual prototype consisted of dump truck 775 E and oil sand haul road has been created in the ADAMS environment. The tire stress in response to the haul road deformation is simulated. The results indicate that the deformation value fluctuate between 0007-0.043m. The result also shows that high stress field applied to each tire is around contact point between tire and road. KEYWORDS: Dump Truck, Haul Road, Interaction, Dynamic Modeling, Virtual Prototype, Simulation. Mining & Exploration: Hot Topics 2:00 PM • Wednesday, February 27 Chair: H. Miller, Colorado School of Mines, Golden, CO The Hot Topics Session was created by the Mining & Exploration Division to focus on specific areas of interest to the SME membership. To keep the session topical, the subject matter is chosen by an M&E Committee several months before the annual meeting. As such, the topic and speakers will be announced and publicized immediately before the meeting. 61
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SME Annual Meeting & Exhibit NEW HO
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How to Register Register by January
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Conference Registration Includes: f
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keynote The Mineral Supercycle: Pas
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