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baghouses blast-furnace charge blast-furnace slag Broken Hill bullion Bureau of Mines capacity charge column diluents drosses dust and fume Eagle-Picher Eutectic excess of coke feed flotation flue dust frcm fused fusible fusion points galena concentrates gases given gray slag Herculaneum hot zone ingredients Inst Joe gravity concentrate Kellogg LEA.D lead blast furnace lead compounds lead content lead oxide lead products lead silicates lead sulfide lead-rich less coke liquate mechanically metallic iron metallic lead Metallurgical Division Minerals Yearbook molten lead Oldright oxidizing oxygen PbSOjj percent of lead percent or ounces pigment plant Process and remarks quoting Schenck rate of smelting reactants heated reactions reducing remove sulfur reverberatory reverberatory furnace rich charges rich lead concentrates roasted products Scotch hearth sinter cake sinter charge sintering machines sintering operation smelter smelting column smelting rich lead sulfate sulfur surfaces TABLE tabulation temperatures treating rich tuyere zone vapor pressure various steps Zinc