Paper Information

Journal:   JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN)   March 2004 , Volume 37 , Number 4 (82); Page(s) 393 To 400.
 
Paper: 

MICRO FLOTATION OF PURE SYNTHETIC AND NATURAL PYRRHOTITE

 
 
Author(s):  KOLAHDOUZAN MOHSEN
 
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Abstract: 

Pyrrhotite is the most important gangue in nickel sulfate mines. Its presence not only produces distractions in upgrading circuits applying flotation but in smelter too by causing SO2 emissions and thus environmental pollution. In this article micro flotation of pyrrhotite was studied using two pure synthetic samples applying a modified Halimond tube. Also to evaluate the effect of impurities a natural sample from Sudbury region in Canada was tested. Results show the different behavior among samples while flotation parameters such as pH, concentration of sodium cyanide, presence of copper ions in pulp and oxidation vary. Based on the results, although applying an alkaline environment, intensive oxidation of the mineral samples and using sodium cyanide as depressant for pyrrhotite are presenting acceptable results to eliminate the mineral in flotation stage; however, the degree of response is a function of crystallography and impurities. Pyrrhotite flotation in alkaline pH, while using 20 mg/l collector, resulted in a recovery between 20 and 30% depending on type of the sample. Applying oxidation at the same pH lessons the recovery for about 10% in all cases. In the other hand, sodium cyanide is able to reduce the recovery for about 5% for all samples. Activating pyrrhotite samples by copper sulfate resulted in a similar behavior in all three types of pyrrhotite.

 
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