Shchyolkovo Plant of Secondary Precious Metals, Shchyolkovo, Russia:

S. I. Rogov, Director of Economic Affairs

National University of Science and Technology “MISiS”, Moscow, Russia:
I. R. Boboev, Assistant Professor of a Chair of Non-Ferrous Metals and Gold, e-mail: boboev-i@mail.ru
A. V. Ryabova, Post-Graduate Student of a Chair of Non-Ferrous Metals and Gold

A. A. Baikov Institute of Metallurgy, Moscow, Russia:

A. S. Atmadzhidi, Post-Graduate Student

Our paper shows the results of experimental and industrial testings of technology of silver-lead-zinc accumulators processing for silver obtaining at the Shchyolkovo Plant of Secondary Precious Metals and JSC “DIEM-21”. The offered technology includes the two-stage oxidation smelting of accumulators with separation of zinc slags on the first stage and fast cooling of preliminary melt. Experiments find the full completeness of zinc removing from accumulators in the slag phase and may be reached observing the certain technological parameters: temperature of 1175 ^oC; flux charge of 40–45% from scrap volume; longevity of 25 min. We offer the grinding and sulfuric acid leaching of slags, containing not less than 26% of zinc. Observance of all parameters makes 93% of maximal extraction of zinc in solution. Solution is cooled with the velocity of 75 ^oC/min and is sent to the second stage. It is reasonable to carry out the second stage of melting with introduction of flux cover. After the melting, lead slag is separated from crude metal. The maximal purification of silver on the level of 95.3% is reached with 2% of flux cover charging from the melt volume and longevity of 30 min. Crude silver is sent to electrolysis. Results of experimental-industrial testings shows the introduced technological scheme.

Our paper was written within the subsidiary agreement No. 14.578.21.0014 on June 05, 2014 (unique identifier: RFMEFI57814X0014) between the National University of Science and Technology “MISiS” and the Ministry of Education and Science of the Russian Federation, within the realization of the Federal Target Program “Investigations and Developments by the priority ways of development of the scientific-technological complex of Russia for 2014–2020”, approved by the governmental order of the Russian Federation on November 28, 2013, No. 1096.

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