The Metallurgy of Lead & Silver: Lead

20 per cent alloy amount antimony arsenic assay average base bullion blast furnace blast pipe bottom brick Broken Hill bullion carbon cast-iron charcoal charge coal coke composition concentrated condensation consumption containing cooling copper cost crucible crust cupellation desilverisation dross dust employed feed floor feet flue flue-dust Freiberg fuel fume fusible galena gases gold hearth heat Hofman inches iron flux Lautenthal lead and silver Leadville lime liquation litharge melting metallic Metallurgy Metallurgy of Lead method mixture molten ordinary oxide oxidised Parkes process pipe plates Port Pirie portion produced proportion Przibram pyrites quantity reduced residue retort reverberatory reverberatory furnace rich lead Schnabel separate shown in Fig siliceous silver contents SiO2 skimmings slag slag pots smelting softening furnace speiss sulphate sulphide sulphuric acid tapped temperature tons treated tuyeres usually volatilisation weight work-lead zinc