252 



The Philippine Journal of Science 



1914 



cast iron. Sample 27 is a representative sample of the slag 

 from the Hison furnace. The first two columns show the actual 

 analyses of the slags as received; the last two columns show 

 the same analyses recast so as to exclude a portion of iron 

 which was found by magnetic separation and analysis to be 

 present in the slag as metallic shot and pellets. 



Table IX. — Analyses of slags from, Bulacan blast furnaces^ 



Constituent. 



Silica (SiOz) -- 



Ferric oxide (FezOs) 



Ferrous oxide (FeO) 



Aliimina {AI2O3) 



Lime (CaO) 



Magnesia (MgO) 



Titanium oxide (TiOz) 



Manganese oxide (MnsOi). 



Sodium oxide (NazO) 



Potash (K2O) 



Sulphur (S) 



Total . 



Sample No. 



13.6 27.B 13.<: 27.C 



Per cent. 

 60.36 

 13.16 



15.85 

 5.82 

 0.88 

 0.55 



trace 

 2.45 

 1.10 



trace 



100. 17 



Per cent. 

 49.94 

 10.75 



14.50 



16.80 

 3.22 

 0.48 



trace 

 2.34 

 1.99 



trace 



100.02 



Per cent. 

 63.90 



7.88 

 16.80 

 6.16 

 0.93 

 0.58 



2.59 



1.16 



trace 



100.00 



Per cent. 

 55.10 



1.25 



16.10 



18.63 



3.68 



0.53 



2.60 



2.21 



trace 



100.00 



» Analyzed by T. Dar Juan, chemist, Bureau of Science. 



i" As received. 



<^ Free from metallic iron. 



If now the analyses of the calculated slag including charcoal 

 ash and the actual slag in the following table be compared, a 

 difference will be apparent which is the result of the fluxing 

 action of the furnace walls and the tuyeres. In these analyses, 

 which are directly comparable, the magnesia and minor con- 

 stituents have been summated to their lime equivalent, in order 

 to show more clearly the general character of the slags. 



Table X. — Analyses of actual and calculated slags from Hison ore 



(sample 6). 



Constituent. 



Silica (SiOi) 



Alumina (AUOs) _. 



Lime (CaO) (summated) 



Total _ 



" Slag 27 ; analysis recast to exclude metallic iron. 



Calcu- 

 lated. 



Per cent. 

 27.4 

 29.2 

 43.4 



100.0 



Actual, a 



Per cent. 

 55.1 

 16.1 

 28.8 



100.0 



