SLAG BRICKS AND SLAG BLOCKS. 



TABLE 254. 

 ANALYSES OF SLAG, MANSFELDT. 



Krug 

 Hutte. 



Koch 

 Hutte. 



Eckhardt 

 Hutte. 



Kupferkammer Hutte. 



Year. 



Lime , 



Magnesia , 



Alumina , 



Iron oxide , 



Manganese oxide , 



Nickel and cobalt oxides. 



Zinc oxide , 



Lead oxide 



Copper oxide 



Silica 



Fluor. . 



Total. 



1888 

 Per Cent. 



18.35 

 6.732 



14.825 

 4.725 

 0.697 

 0.063 

 1.165 

 0.232 

 0.289 



47.63 



1888 

 Per Cent. 



23.187 

 2.22 



17.001 

 4.643 

 0.328 

 tr. 



0.692 

 0.118 

 0.277 



48.465 



1888 

 Per Cent. 

 21.51 



0.847 

 16.525 



2.768 



0.744 



tr. 



0.934 



tr. 



0.3 

 46.39 



1881 



Per Cent. 



19.29 



3.23 



16.35 



10.75 



1.26 



0.75 

 48.22 



97.708 



96.931 



90.018 



99.85 



I ssi 



Per Cent. 

 20.29 



4.37 

 15.67 



8.73 



1.11 



0.67 

 50.0 



100.84 



Year. 



Lime 



Magnesia 



Alumina 



Iron oxide 



Manganese oxide 



Nickel and cobalt oxides. 



Zinc oxide 



Lead oxide 



Copper oxide 



Silica 



Fluor. . 



Total. 



Kupferkammer Hutte. 



1881 



Per Cent. 



19.50 



8.02 

 18.17 



5.89 



3.57 



0.23 



48.38 

 0.99 



99.75 



1888 

 Per Cent. 



19.15 

 3.677 



17.636 

 7.213 

 0.827 

 0.038 

 2.056 

 0.065 

 0.333 



46.81 



97.802 



Sangerhausen Hutte. 



1881 



Per Cent. 



33.10 



1.67 



4.43 



4.37 



0.25 



53.83 



2.09 



99.74 



1881 



Per Cent. 



23.40 



0.87 



7.83 



7.47 



.30 



57.43 



1.97 



99.27 



has been preferred. The tiles are sold for from $30 to $60 (pesos Chilenos) 

 per thousand. 



Slag blocks have been manufactured at a Montana copper smelter 

 by a process which contrasts strongly with the practice at Mansfeldt 

 and Santiago. The copper slag was poured into iron molds built up 

 by putting together iron plates of proper form. The process was carried 

 on in the open air and no covering of any kind was placed on the blocks. 

 The slag in consequence cooled very rapidly. Though the product 

 was, therefore, not as dense or tough as that secured at Mansfeldt, the 

 Montana practice effected a great saving of time and space. 



