INI S-mf—9098 ABSTRACTS of papers to be presented at INTEK 50 ' fil f International Conference on Recent Advances in Mineral Science and Technology Sandton, 26th to 30th March, 1984 •J j ABSTRACTS 1 1 —•• "1 of papers to be presented at MINTEK 50 Published and printed by the Council for Mineral Technology (Mintek) 1984 CORRIGENDA ABSTRACTS OF PAPERS TO BE PRESENTED AT MINTEK 50 (1) Paper A 7/2 (page 53) Abstract not yet available. (2) Paper C1/1 (page. 110) The title and abstract are as follows: SESSION Cl Modern Steel Processes Paper Cl/1 THK MRKCT USE OF COAL IN IRON- AND STEEL-MAKING OPERATIONS by L. Von Bogdandy, M. Chitil, J.A. Innes, and C.G. Jonker Kloeckner CRA, West Germany Tlu* use of widely available low-cost bituminous coal in steelmaking to compete with coke-based or electricity-based processes was adopted by the Kloeckner-CRA joint venture as the basis of technology development in the steel industry. This led to the introduction of the Allothermic converter and steelmaking processes such as KMS and KS, which permit the partial and full replacement of hot metal by scrap in steelmaking. These processes feature the pneumatic injection of coal into an OBM converter, in which part of the coal energy is used for melting and part is converted into a gas of medium calorific value. This gas is used to replace natural gas or oil requirements in existing steel plants. Post-combustion of the gas in the converter itself is a major tool in increasing the proportion of available energy in coal for melting purposes. The control of post- rom')ustion is therefore an important area of technical innovation in steelmaking. The very flexible operating mode of the AHothermic converter permits the economically optimal combination of hot metal-scrap ratios, steel production, and gas production for each plant location. Industrial-scale pilot-plant work on the use of the AHothermic converter as a coal- gasification medium has been completed. Further development work coupling the AHothermic converter with a direct-reduction unit indicates great potential for the reduction of operating and investment costs in the steel industry. 7 CONTENTS The letter and numbers preceding each title indicate the session in which that paper is to be presented, and the second number indicates the position of the paper in a parallel session, e.g. B2/6 means that the paper is the sixth presentation in Session B2. It should be noted that the titles and authors are not necessarily the same as they will appear in the final programme. They appear here as they were at the time of going | to press. Plenary Sessions i Page PI Plasma Metallurgy in the 1980s, by K.J. Reid 1 ; P2 Recent Advances in the Leaching of Sulphides and in the Precipitation of Iron, byJ.E. Dutrizac 3 P3 Ore-dressing Developments in North America, by A.L. Mular 5 P4 Developments in Separation Science in Hydrometallurgy, by D.S. Flett 5 • P5 Recent Developments in the Modelling and Control of Mineral Processing | Plants, byAJ. Lynch and D.J. McKee 7 ' P6 Progress in Instrumental Analysis: Developments in Atomic-absorption, X-ray-fluorescence, and Plasma-emission Spectrometry for the Analysis : of Metals and Ores, by R.L. Watters, Jr 9 Session Al: Optimization of Ore-dressing Processes and Energy Saving Si A1/1 Improvement of Dynamic Dense-medium Processes by Using Two-stage f Separation Systems with Recirculation of Middlings, by G. Ferrara, H.J. ! Ruff, and G. Schena 11 A1/2 Fundamental Factors Affecting the Efficiency of Fine-coal Beneficiation: the Petrographk and Mineralogical Composition of Coal, by L.M. Falcon and R.M.S. Falcon 12 A1/3 Investigation of the Latest Crusher Technology at Rustenburg Platinum Mines Ltd—Union Section, by L.A. Cramer and R.E. Phillips 13 A1/4 An Applied Mineralogical Investigation into the Production of a Pyrite Concentrate from the Roan Antelope Ore Deposit, Zambia, by M. Pearl and N. Kostic 15 l Session A2: Optimization of Ore-dressing Processes and Energy Saving (continued) • A2/1 The Improvement of Hydrocycloning Efficiency by Modification of the i Vorticity Function of the Flow Field, by M.D. Brayshaw and E.T. j Woodburn 17 A2/2 Control and Optimization of the Operation of Milling Circuits, by D.G. Hulbert and I.J. Barker 19 A2/3 The Measurement of Parameters Describing the Dynamic Behaviour of the Load in a Grinding Mill, by M.H. Moys 20 A2/4 The Effects of Changes in Liner Design and Mill Speed on Rod-mill Parameters, by D.D. Howat and L.A. Vermeulen 21 Session A3: Optimization of Ore-dressing Processes and Energy Saving (continued) -•> A3/1 Flotation Machine Scale-up: the Path Towards Improved Process Economics, by V.R. Degner 23 A3/2 The Influence of Polymeric Depressants on the Adsorption of Thiol Collectors in Sulphide Flotation, by E. Sieenberg and P.J. Harris 25 A3/3 The Hydrophobic Character of Semi-soluble Salt Minerals with Oleate as Collector, byJ.D. Miller and M. Misra 26 A3/4 A Study of the Selective Flotation of Fluorite from Calcite by the Use of a Single Bubble-stream Microflotation Cell, by E.W. Giesekke and P.J. Harris 28 Session A4: Treatment of Fines, Tailings, and Low-grade Ores A4/1 Surface Interactions in Fine Particle Flotation, by P. Somasundaran. 29 A4/2 Pyrite Flotation with Diethyldithiophosphate and Mercaptobenzthiazole: an Electrochemical Study, by D.R. Groot 31 A4/3 Improvements in the Flotation of Low-grade Fluorspar Ores, by P.G. Kilian 32 A4/4 Gold Recovery by Flotation at Bougainville Copper Ltd, by N.C. Clarke and E.W. Beermann 33 Session A5: Treatment of Fines, Tailings, and Low-grade Ores (continued) A5/1 The Role of Waste Sorting in the South African Gold Mining Industry, by J.S. Freer and R.C. Bohme 36 A5/2 Selective Magnetic Flocculation of Fine, Weakly Magnetic Minerals, by J. Svoboda 37 A5/3 Single-wire Magnetic Separation: a Diagnostic Tool for Mineral Processing, byJ.H.P. Watson and D. Rassi 40 A5/4 Bacterial Heap Leaching of Low-grade Nickel Material, by P.C. Miller, I.J. Corrans, and A.J. Southwood 42 Session A6: Innovations A6/I The Design and Construction of a Superconducting Magnet for Production-scale Dry Separation of Minerals, by J.A. Good and K. White 44 A6/2 Industrial-scale Dry Beneflciation of Phosphate-bearing Pyroxenite Ore, by E.H. Roux, J.G. Goodey, E.F. Wepener, and K.R. Hodierne.... 45 A6/3 Fast Flotation with an Air-sparged Hydrocyclone, by J.D. Miller and D,J. Kinneberg 46 A6/4 Some Engineering Guidelines on Flotation Reagent Use, by R.R. Klimpel 49 Session A7: Modelling Design and Control A7/1 The Process Engineering of Size Reduction Using Ball Mills, by R.R. Klimpel and L.G. Austin 52 A7/2 Particle Trajectories and Charge Shapes in Centrifugal Milling, by D.I. Hoyer 53 J A7/3 Multivariable Control at Frank Concentrator, by I.J. Barker, S.C. Axcell, and D.G. Hulbert 53 A 7/4 The Use of Simulation in the Operation and Design of Mineral Processing Plants, by D.J. McKee and A.J. Lynch 54 Session A8: Modelling Design and Control (continued) A8/1 Recent Advances in On-stream Analysis Equipment, by A. Toop, L.R. Wilkinson, and G.J. Wenk 57 A8/2 A Recent Advance in On-stream Analysis Equipment for Mineral Concentrators and Metal Refineries, by K. Saarhelo and D.R. Barker 59 Session Bl: Electrolytic Processes Bi/1 Recent Developments in the Design of Electrochemical Cells for the Recovery of Metals, by R. Kammel 61 Bl/2 The Electrodeposition of Manganese Dioxide: Theory and Practice, by R.L. Paul and A. Cartwright 62 Bl/3 The Electrodialytic Generation of Sulphuric Acid and Ammonia from Dissolved Aqueous Ammonium Sulphate, by P. Steel and B. Verbaan 63 Bl/4 The Electrowinning of Chromium from Trivalent Chloride Solutions, by M.D. Birkett 65 Session B2: Equipment and Modelling B2/1 Kinetic Models for the Adsorption of Gold onto Activated Carbon, by J.S.J. van Deventer 68 B2/2 The Measurement of Carbon Concentration in the Adsorption Vessels of a Carbon-in-pulp Plant, by N.D. Hulse, B. Fitzgerald, and M.J. Ohlson de Fine.. 69 B2/3 An Investigation into Some of the Factors Influencing the Filtration of Metallurgical Slurries, by G.F. Lahoud and W.A.M. te Riele 70 B2/4 NIMCIX Absorption Columns for the Recovery of Uranium at Vaal Reefs South, by M.A. Ford and R.J. Kelly 72 Session BS: Leaching Processes B3/1 Composition and Phase Changes during Oxidative Acid Leaching Reactions, by A.R. Burkin 73 B3/2 • Uranium-bearing Minerals in Witwatersrand Rocks, and Their Behaviour During Leaching, by G. Smits 74 B3/3 The Mode of Occurrence of Gold and Silver in Dominion Reef and Their Response to Cyanidation After Pressure Leaching, by G.W. Glatthaar and C.E. Feather 76 B3/4 Modelling of the Hartebeestfontein Gold Mine Uranium Leaching and Ion Exchange Processes and Its Role in Economic Plant Operation, by B.R. Broekman and B. Ward 77 Session B4: Leaching Processes (continued) B4/1 Laboratory Testing of UJudag Scheelite Concentrate for the Production of Ammonium Paratungstate, by Y.A. Topkaya and H. Eric 79 B4/2 The Direct Leaching of Oxidic Manganese Ores, by W.A. Nattrass and W.A.M. te Riele 80 B4/3 Enhanced Leaching Kinetics of Chalcopyrite from CuFeS2/C Paniculate Aggregates by Ferric Sulphate, by R.Y.