Stäl Current and Emerging Smelting Technologies Ferroalloy Research in Norway - Cooperation between Academia and Industry 73 M. Eksteen SiC Formation in Submerged Arc Furnaces Producing Silicomanganese 55 P. Taskinen Experimental Thermodynamic Study of the Equilibrium Phase Assemblage AgBi3S5-Bi2S3-S 213 F. Sato Optimum Feed Preparation for Sulfide Smelting 133 J. .
Ye Phase Change and Morphology in the Oxidation of Zinc Sulfide Powder 155 O. Kwalela Pretreatment and Recycling Processes Integrated Recycling at Boliden's Ronnskar Smelter; Formation of Slag Products 117 S. Ringdalen Status of the Alcoa Carbothermic Aluminum Project 81 C. The laboratory work has involved the injection of different gases from a submerged, horizontal tuyere into water, zinc-chloride solution, and a mercury bath. Sundqvist Ökist, G Hyllander, M. The simulation results for the velocity fields and the generation of turbulence in the bath were validated against existing experimental data from the previous water model experimental study by Morsi etal.
The difference between the horizontal and vertical jets is discussed. The study wil l build on the recent breakthrough in understanding the kinetics of refining reaction, in particular the mathematical treatment of the buoyancy effect of the ejected droplets due to high speed oxygen injection, on the overall refining kinetics of phosphorus. The model results predicted that the rate of ZnO reduction is controlled by the mass transfer of ZnO from the bulk slag to slag—gas interface and rate of gas-carbon reaction for the specified simulation time studied. Ye Phase Change and Morphology in the Oxidation of Zinc Sulfide Powder 155 O. Matusewicz Validating Temperature Measurements in Pyrometallurgical Applications - A Case Study 259 H.
Tangstad High Temperature Experimental Investigations and Thermodynamic Modelling in the FeTiO3-Ti2O3-TiO2 Ternary Slag System 185 S. Analysis of the slag samples has shown that, in general, the zinc elimination curve is linear with time and that a portion of the injected coal entrains in the slag. Tangstad Boliden Ronnskar Smelter: Challenges and Opportunities for Modern Smelting 63 T. The measured bubble frequency and volume correspond reasonably well to predictions of a simple model of bubble growth under conditions of constant flow. This necessitates periodic punching of the tuyeres which also contributes to refractory wear at the tuyere line. Ye Phase Change and Morphology in the Oxidation of Zinc Sulfide Powder 155 O. Sorhuus High Performance Brands for the Non-ferrous Metals Industry 39 D.
The effects of the lance submergence level and the air flow rate also were investigated. Slag fuming is a process of extracting zinc from molten slag in the form of metal vapor by injecting or adding a reducing source such as pulverized or lump coal, natural gas, etc. The jet expansion angle measured for the slag system studied is 85 deg for the specific inlet conditions during the simulation time studied. With respect to the influence of manipulable process variables, the model predicts that zinc fuming can be enhanced by increasing the fraction of coal entrained by the bath up to an optimum value at a fixed coal rate. The simulation results for the air—water system showed that mean convective mixing for swirl flow is more than twice than that of nonswirl in close proximity to the lance. Eksteen SiC Formation in Submerged Arc Furnaces Producing Silicomanganese 55 P.
The behavior of gas discharging into a liquid has been investigated in the labora-tory and in plant. Insufficient information is available, however, to characterize quantitatively two of the important kinetic processes occurring in the furnace: the division of coal between entrainment in the slag, combustion in the tuyere gas column and bypass; and oxygen utilization. Tests involving higher pressure injection indicate that the steady jetting, or underexpanded, regime obtains at pressures of about 340 kPa 50 psi. Taskinen Vacuum Distillation Refining of Crude Tin - Thermodynamics Analysis and Experiments on the Removal of Arsenic from the Crude Tin 223 Y. Jimenez Improvements on Converter Operating Practice at Mufulira Smelter 107 J. Kennedy Physical Modeling Study on Mixing Phenomena in a C-H2 Smelting Reduction Furnace Bath with Asymmetric Side Blowing Process 291 J. An increase in entrainment could be achieved by injecting the desired portion of the coal at high pressure and solids loading through a small number of tuyeres.
Buchmayer Author Index 309 Subject Index 311 Other Titles: 6th Advances in Sulfide Smelting Symposium Responsibility: edited by Jerome P. Ringdalen Status of the Alcoa Carbothermic Aluminum Project 81 C. Tangstad High Temperature Experimental Investigations and Thermodynamic Modelling in the FeTiO3-Ti2O3-TiO2 Ternary Slag System 185 S. The gas fraction and bubble frequency distributions in a submerged air jet, injected horizontally into mercury, have been measured under isothermal, nonreactive conditions for nozzle diameters of 0. It is suggested that the differences may be attributed to the porous nature of the chars.
Taskinen Experimental Thermodynamic Study of the Equilibrium Phase Assemblage AgBi3S5-Bi2S3-S 213 F. Taskinen Experimental Thermodynamic Study of the Equilibrium Phase Assemblage AgBi3S5-Bi2S3-S 213 F. Pistorius Experiences of Using Various Metallurgical Reactors for Reduction of Vanadium Bearing Steel Slags and Other Wastes 147 M. Tangstad Boliden Rönnskär Smelter: Challenges and Opportunities for Modern Smelting 63 T. A mathematical model has been formulated to describe the combustion behaviour of single particles of pulverised bituminous coal and the predictions have been compared with experimental values obtained using a small tube furnace. In this work, a three-dimensional numerical simulation of a single horizontal gas jet into a cylindrical gas-solid fluidized bed of laboratory scale is conducted.