IRON MANUFACIURE. 547 
GHRATDION IG 000669.040068060000000000000000000 060000000 6000000000000000000000000 060000000800 2.61 
Comme MICA HOM seas tere eee oeceetlonecelseaeceles Ee cab Sheet EEA oea on eeike 30 
ST COTM reece iree ne secon caeraa ee ce ated Mat ctio/ ne siecils caters geials Ne slctne v dasiararente' ns ates eases 3.70 
IPIAGKY DI ACTAWS oa06e0 200660 600660, 000000 096008000660.000060000000008060000600000009 600600 000600 16 
7.37 
Mire taliivcrino nh se ce ccs see tases cnet BOR 0 Hac CO BUCS CE RCC ESE ROC Gee Coane CeCe 92.50 
The yield of the ore and cinder was 323 tons of pig-iron; this 
contains 298.8 tons of iron; of this the cinder gave 123.9 tons, leaving 
174.9 tons derived from the 434 tons of ore; this corresponds to 40.3 per 
cent. of iron. The small amount of iron in the coal ash and limestone 
has been neglected, as it is only about equivalent to the small amount 
taken up by the slag. 
As the ore is roasted the iron must be calculated as sesquioxide, of 
which it will furnish 57.5 per cent.; the difference between this and 
100 shows the amount of earthy material in the ore; it is 42.5 per cent. 
This shows the ore to be on the average poorer than is found by analy- 
ses of single specimens; such an analysis of average roasted ore 
showed : 
SEEGMIORId CLO MITOM ees ccc scams iss cot ceven sess dues owas e cee saselsajenesseicnsess 63.78 
ISIUDKEE 906660668660680600000005000005000000 000000000 COUEQDODU DODO SOOECOOGECS: GUOBUO HB EOOBROD 22.15 
PAUL Aeeresrne en enon eat rcts cc cen tiecsue cvs coccocessrdsavencssesdeacesens aeeese.csceaedes 9.31 
GIMME FATT SIM AGN SLA yeewces ccltclan eee ai ewes oecoecs et occncndsesuees scttousctticestes 1.64 
This relation between the silica, alumina and lime of the ore may 
be safely assumed. ! 
Stating in tabular form the material which makes up the slag, we 
have as follows: 
Tons. 
Murmi sla CdgpysOrewrctciencccesccotccove sity, scsebcssencekandedsehceeseseeeteveieed 184.4 
3 CHING Cla rere seers enact. eae cetetaeet te a aeepeanas ie coR eae aheites 72.9 
‘f Coal¥ashe (Als) hect-csssecvecte sutscecerecen seuss onthueesveese 48.1 
" NIT OS COMEOR Le seer o cian ssecese dasecchcccdcsor sua te smeedeclers seo ssiaccnds 248.5 
ING fen Petes egesecarsks Sedo orci cetera Secloa Secrool oa Nats dsiare vigjnae Seis Seiinsielee'e's wcine see's 553.9 
From this should be deducted the silica and phosphorus, corres- 
‘ponding to that in the pig-iron, which amount to nearly 10 per cent. 
of the iron (the silicon received as silica and the phosphorus as acid.) 
The slag left after making this deduction is 521.6 tons, or 1.6 tons for 
each ton of pig-iron made. 
