198 



Indiana University Studies 



the more progressive lirae plants of this country are sure to install 

 it in the near future. 



Limestone in Lead Smelting. The Savelsburg process 

 of lead smelting consists of heating an intimate mixture of 

 galena or lead sulphide with limestone and water, in a reverbera- 

 tory furnace in a strongly oxidizing atmosphere. The resulting 

 mass contains the lead in the form of an oxide, and calcium sul- 

 phate, from which the lead can be removed by any of the ordinary 

 methods of shaft furnace purifying. This process is often carried 

 on with lime, instead of limestone, mixed with the galena. These 

 methods are giving way to direct-blast furnace oxidation which 

 can be accomplished if the temperatures are carefully regulated. 



