CONCENTRATION OF FELDSPATHIC WASTE FROM A TITANIUM MINE NEAR ROSELAND,VIRGINIA *

The beneficiation of the feldspathic waste from a titanium mine near Roseland, Virginia, is discussed. This waste, which is mainly sodic plagioclase, quartz, and an iron-bearing mineral, gedrite, contains about 5.3% of Fe₂O₃. By magnetic concentration, 73% of the feed was recovered in a feldspar-quartz mixture with an iron content of 0.81% of Fe₂O₃. From this nonmagnetic product, between 85% and 90% of the feldspar with an iron content of 0.41 to 0.52% of Fe₂O₃ was recovered by agglomerate tabling and flotation. Examination of the feldspar concentrate, however, showed that iron stains and iron-bearing impurities of microscopic size in the feldspar prevented the separation of a feldspar concentrate with less than 0.36% of Fe₂O₃.     

Nickel Plating for Improved Electrical Contact to Aluminum

A plating for electrical contact surfaces should be selected on the bases of acceptable electrical characteristics (in conjunction with common contact surfaces) and of adequate corrosion resistance in the anticipated environments. One of the problem electrical interfaces which must be considered is between the selected plating and nonplated aluminum contact surfaces.