Phase relation and thermodynamics in Iron-lead-sulphur system.
PHASE RELATION AND THERMODYNAMICS IN IRON-LEAD-SULFTJR dYSTBM In this investigation, phase relations and thermodynamic properties in the ternary system Fe-Pb-S were determined. High temperature phase relations in the FeS-PbS binary system were established by quenching samples equilibrated in evacuated and sealed silicla tubes. The eutectic temperature was found to be 842"C at 46 atomic percent PbS. Activities of PbS in this system were measured at 1100· and 1200°C by the dew-point technique, and negative deviations were observed.' Krupkowski solution model was applied to the measured activities and experimentally measured liquidus lines were verified. Within the Fe-Pb-S ternary system, the boundaries of the immiscibility region together with the tie-line distributions were drawn at 1200°C. Activities of lead were measured by the dew point technique. Furthermore, lead, iron and sulphur activities were calculated by modelling along the ternary miscibility gap.
A dissertation submitted to the Faculty of Engineering, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science in Engineering.
LEAD ALLOYS--METALLOGRAPHY., PHASE DIAGRAMS, TERNARY., PHASE DIAGRAMS., THERMODYNAMICS.