E/MJ : engineering and mining journal . in. by 5 ft. atthe tuyeres. Blast enters through thirteen 3-in. tuyeresat 60-oz. pressure. Working normally, this furnace iscapable of treating 300 tons of charge per day, exclusiveof returned slag and coke, with an output of 100 tonsof lead. Tapped slag flows into a cast-iron forehearth mountedon wheels, where the lead and matte is caught, the slag overflowing into a 3-ton cast-iron pot, from which it ispoured on the dump, the sculls being re-smelted. Fore-hearths are replaced several times a shift, the full onesbeing taken to the matte shed, where they
E/MJ : engineering and mining journal . in. by 5 ft. atthe tuyeres. Blast enters through thirteen 3-in. tuyeresat 60-oz. pressure. Working normally, this furnace iscapable of treating 300 tons of charge per day, exclusiveof returned slag and coke, with an output of 100 tonsof lead. Tapped slag flows into a cast-iron forehearth mountedon wheels, where the lead and matte is caught, the slag overflowing into a 3-ton cast-iron pot, from which it ispoured on the dump, the sculls being re-smelted. Fore-hearths are replaced several times a shift, the full onesbeing taken to the matte shed, where they are drainedof matte and lead, and the shells knocked out. Anyslag tapped out of these forehearths, together with theshell, is returned to the blast furnace. Nos. 2 and 3furnaces are similar to No. 1, but are smaller. On ac-count of the large variety of ores treated, the slags areof varying composition. As an illustration, however,the following analysis is given: Pb, per cent; FeO,36; MnO, ; CaO, 17; SiO„ 24; ZnO, 12 per STARTINS POINT Proceedings of the Australasian Institute of Mining EngineersMelbourne, l^o. 31, pp. 1-39 ; Joint authorship. 60LDnCLTiN6 s^LVCRnanmruRmc£ FUKMU fINISHCD PRODUCTSPI^OW SHEET AT COCKLE CREEK REFINERY The lead, tapped from the forehearth in small cast-iron pots, is run across to the dressing furnace. Thisis a small reverberatory of about seven tons capacity,from which is obtained lead bullion (carrying most ofthe gold and silver) and dross. The dross, on beingremoved from the top of the lead, is still fairly wet,and is transferred to a liquating furnace, where mostof the lead is sweated out and returned to the drossingfurnace, the more or less dry dross being re-smeltedin the blast furnaces after a sufficient amount has ac-cumulated. Lead matte, caught in the forehearths, iscast, cooled and ground in the Krupp mills for subse-quent incorporation in the charge. The lead fromthe drossing furnace is cast into bars of about 85 lb
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries