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|Detailed studies of the microstructures and compositions of zinc and lead blast furnace sinters have been undertaken. An analysis of the results obtained has indicated that in many cases the microstructures of these complex materials can be explained by the solidification of melts from pseudo-ternary phase systems. Further laboratory studies have been carried out to more accurately determine the extent of primary phase fields and the liquidus temperatures in the appropriate binary and ternary systems. This approach shows considerable promise in simplifying the descriptions of slag systems used in oxidising and reduction smelting processes for lead and zinc recovery.|