Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia:

N. L. Medyanik, Head of Department, Professor, Doctor of Engineering Sciences, e-mail: chem@magtu.ru
V. N. Kalmykov, Professor, Doctor of Engineering Sciences
N. L. Kalugina, Assistant Professor, Candidate of Pedagogical Sciences
E. V. Leonteva, Post-Graduate Student

The purpose of the research is studying material composition of old flotation tailings of pyrite ores and the development of thermochemical method of their chloro-ammonium processing taking into account the identified composition. The tailings at Uchaly Mining and Processing Integrated Works contain pyrite, quartz, chlorite, gypsum, barite and feldspar according to mineralogical studies. Possibility of two-step thermochemical chloro-ammonium processing of dumped sulphide tailings, that consists of gold and silver unlocking and pyrite sintering in air with ammonium chloride at 250-275 °C, have been studied. The gold leaching by sintering with a mixture of chloride and ammonium nitrate at 200 °C has been carried out. The silver recovery to solution has made up to 83% under these conditions. The recovery of gold from leaching solutions uses diphenylguanidine as the complexing reagent. The gold recovery from the fi rst stage’s cake is up to 85.8–87.5%. The processing of flotation tailings of pyrite ores with low hazard reagents and the absence of harmful emissions will significantly increase ecological friendliness of mineral mining and processing.

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