UTAH ACADEMY OF SCIENCES 241 
work of collecting the copper chloride fumes from the 
chloridizing furnace. 
The results of these efforts have been decidedly 
promising. The copper chloride fumes are readily col- 
lectable and the dry material is obtained in a convenient 
form for further treatment. 
Copper is quite readily eliminated from coarsely 
ground ore and the tailings disposed of in granular con- 
dition. ‘The temperature of dull redness required is not 
sufficient to melt nor even to sinter ordinary silicious 
copper ore. 
The operation of grinding the ore and mixing with 
salt, the feeding of the mixture to the rotary kiln of 
ordinary cement-burning type, need not be more than 
briefly referred to, nor need I do more than to mention 
the settling of mechanical dust, and the precipitation of 
the copper chloride fume in the Cottrell treater or the 
bag house. These are operations already standardized 
and their uses with the chloride fumes need no com- 
ment here. 
The fume recovered from whichever collector is 
used is a light fluffy powder cf yellow-gray to green 
color. Its content in copper when free from the ore dust 
suggests a predominence of cuprous chloride, the cupric 
material seems to be present in greater or lesser amounts. 
Analyses show that the copper content may reach above 
50% of the whole. The remaining half of the collected 
fume is largely chlorine. The presence of sulphate of 
copper, and of silica may be expected but each of these 
is dependent upon the nature of the ore and the conditions 
of treatment. 
It is entirely possible to get a favorable extraction 
from an ore carrying no appreciable amount of sulphur, 
and the settling chambers may be designed quite satis- 
factcrily to eliminate the mechanically carried siliceous 
fine ore. 
Now the treatment of these chloride fumes presents 
to the metallurgist a set of new problems. Can this new 
concentrate of fifty per cent metal be sent to the smelter 
for further treatment? What is the process in pyro- 
metallurgy ordinarily employed on a fifty per cent copper 
