The Iron and steel magazine . s ,, ,, ,, ,, ,, Therefore the excess of Si02 in the ore requiring to be fluxed ofTwill be — = 2. On again referring to the diagram, we find that 2 parts of Si02 require parts of CaOX)or, 2 ,, ,, Si02 ,, ,, ,, CaC03. That is to say, every 100 tons of this ore will require tons oflime or tons of limestone in order to produce a monosilicateslag. Allowance can be made for the ash of the fuel used, and foreach per cent of sulphur in the fuel 3 tons of limestone must beadded to the charge for every 100 tons of fuel used; thus, if cokecon
The Iron and steel magazine . s ,, ,, ,, ,, ,, Therefore the excess of Si02 in the ore requiring to be fluxed ofTwill be — = 2. On again referring to the diagram, we find that 2 parts of Si02 require parts of CaOX)or, 2 ,, ,, Si02 ,, ,, ,, CaC03. That is to say, every 100 tons of this ore will require tons oflime or tons of limestone in order to produce a monosilicateslag. Allowance can be made for the ash of the fuel used, and foreach per cent of sulphur in the fuel 3 tons of limestone must beadded to the charge for every 100 tons of fuel used; thus, if cokecontaining per cent sulphur is being used, then tons oflimestone must be added for every 100 tons of coke charged. If the limestone used is siliceous, the amount of limestonerequired to flux off this silica can be obtained from the diagram,and this figure subtracted from the total CaC03 in the limestone,and the resulting figure used as the available fluxing material. Computation of Blast Furnace Chai 22 r ACID - varus - €jw 222 The Iron and Steel Magazine Example of the Method of Regulating the Charge from theAnalysis of the Slag Produced. — The following is the composi-tion of a slag from copper blast furnace, supposed to be makinga bisilicate: Silica per cent Alumina Lime Magnesia Ferrous oxide Barium oxide On referring to diagram No. 2 we find that the parts of A1203 flux off parts of SiO,,, ,, CaO „ ,, 3-o MgOFeO BaO. and the total bases 5-3 55-4 That is to say, there is sufficient base in the slag to forma bisilicate with parts of silica, but from the analysis wefind there is only present per cent; the difference betweenthese figures, , gives the amount of Si02 which could be fluxedoff by the excess of bases in the slag. To form a bisilicate with parts of Si02 requires partsof CaO or 12 parts of CaC03; therefore, for every 100 tons ofslag produced in the furnace, to
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Keywords: ., bookcentury1800, bookdecade1890, bookidironsteel, booksubjectiron
