Coal Age

APR 2013

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coal prep preview 2013 continued Continued from page 33 Technical Session III: Plant Operations takes place on Wednesday afternoon and has five presentations: Online Determination of the Ash Content in Coal by LIBS—Laserinduced breakdown spectroscopy (LIBS) could increase the statistical significance of the analytical results by performing online measurements and providing almost instantaneous feedback about the state of the processed material. The information can be used for feedback control of upstream process steps. Indirect Drying for Efficient Recovery of Wet Coal Fines—Having incorporated many technology, design and capacity improvements, hollow-screw, indirect-heated dryers offer a cost-effective means of recovering the energy value of coal fines in today's economic and regulatory environment. Improvements in Centrifugal Dryer Performance Using Chemical Treatments—This presentation describes the working concept behind a new generation of dewatering aids, including experimental data from the in-plant evaluation program, and provides a cost-benefit analysis of this approach to improved plant moisture management. Online Monitoring of Operation Performance of DMC—An online system monitors the operational performance of dense medium cyclones (DMC) using a system based on electrical impedance spectrum (EIS). Plant-base trials indicate that the medium relative density measured by EIS agrees reasonably well with other forms of monitoring. New Developments in Dust Control—This presentation discusses three new techniques for dust control. The technical program concludes with, Session IV: Specific Gravity, which takes place Thursday morning, May 2. April 2013 Development of an Automation System for Coal Spirals—The main goal of this study was to develop a suitable sensor and control system to automatically adjust the product splitter position for a full-scale spiral. Several basic properties of coal slurry were investigated for their online measurability and their correlation with the constituent solid density of the slurry. An electrical conductivity (i.e., reciprocal of resistivity) -based proprietary sensing technique has been selected for measuring solids density of particles in the spiral trough. Dry Coal Sorting: Next Generation Technology for Coal Preparation—DriJet sorting technology, which has been designed specifically for coal cleaning applications, offers many benefits for coarse coal upgrading including mechanical simplicity, high capacity, low cost and minimal environmental impacts. Recent test data from both run-of-mine coal and waste coal upgrading applications will be presented. Investigation of Misplaced Material in Large Diameter Dense Medium Cyclones—The reasons for the low density tails that have been seen with alarming regularity in large diameter DMC partition coefficient curves have been investigated. Two aspects of the issue are addressed in this presentation: precision of partition coefficient measurement and the influence of particle breakage. A New Low Cut Point Spiral for Fine Coal Separation—This presentation outlines the spiral design evolution and presents results obtained from testing alongside conventional LD4E, LD7 and LD7RC spiral models. The lowest cut point of any of the conventional models was 1.55 (on the LD7RC). The LC3 readily achieved cut points below 1.4 with measured efficiencies as good as or better than those of the other models. www.coalage.com 53

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