2010. APPLICATION OF SULPHATE ROASTING IN PROCESSES OF COMPLEX EXTRACTION OF VALUABLE REDUCTANTS FROM POLYMETALLICAL CONCENTRATE . Proceedings of the YSU B: Chemical and Biological Sciences. 44, 2 (222) (May 2010), 19–23. DOI:https://doi.org/10.46991/PYSUB.2010.44.2.019.