New Technology of Processing Pyrite Concentrate
2013year1month1day · Patent of USSR No. 815055. Hakobyan K.Y. et all, (1980), Development of new technology of sodium sulfide production from pyrite concentrate, Report, Kapan - Yerevan, 22 pages (in Armenian). Hakobyan K.Y., Melkomyan A.A, (1982), The ways of complex processing of pyrite concentrates. Proc. AlUnion conference on wastefree