. The Iron and steel magazine. ixer to the primaryfurnace, and, after partial purification, to transfer again to thesecondary furnace for final treatment. An arrangement of plant well suited for the process is shownon Figs. I, 2 and 3 herewith. Any scrap that it is desirable to melt up and make use of ischarged into the secondary furnace, and the quantity so usedis only limited by the time occupied in charging the furnaceand melting. A pair of furnaces, working 16 tons of phos-phoric pig in the primary, and 20 tons with scrap in the sec-ondary furnace, would tap at least every two and one-half
. The Iron and steel magazine. ixer to the primaryfurnace, and, after partial purification, to transfer again to thesecondary furnace for final treatment. An arrangement of plant well suited for the process is shownon Figs. I, 2 and 3 herewith. Any scrap that it is desirable to melt up and make use of ischarged into the secondary furnace, and the quantity so usedis only limited by the time occupied in charging the furnaceand melting. A pair of furnaces, working 16 tons of phos-phoric pig in the primary, and 20 tons with scrap in the sec-ondary furnace, would tap at least every two and one-half hours,so that charging by pouring in molten metal and mechanicalcharging of the scrap are desirable, and even necessary, to obtainthe best results. A mixer is no part of the Bertrand-Thiel process any morethan it is of the Bessemer or Thomas processes. In the case of two works employing the Bertrand-Thiel pro-cess, the pig iron containing a high percentage of phosphorus, Bcrira)id-Thicl Process in the Mauujaciurc of Steel 115. ii6 The Iron and Steel Magazine it was found advisable to employ a gas-heated mixer, in fact, alarge tipping gas-heated furnace. In it the molten metal fromthe blast furnace is poured and retained for use as required,week-end metal melted, desulphurization takes place, and thepercentage of silicon is reduced. If a temperature of about1500° C. is maintained in the furnace, cold pig iron is readilymelted, and the wear and tear of the furnace is slight. Average Composition of Metal charged to Mixer AverageComposition of MixerMetal ready for SteelFurnaces Average Composition of Primary Metal Average Composition of Final Metal Carbon . .Silicon . .Sulphur . .PhosphorusManganese Per Per Cent Per Per Cent0, Note the reduction in sulphur and silicon in the mixer,and that the carbon remains almost untouched. The mixer is a costly piece of apparatus, and in order toget a better
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectiron, bookyear1898
