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Single-stage synthesis of nickel concentrate in processing of rhenium-containing heat-resistant alloy

https://doi.org/10.17073/0021-3438-2016-5-17-23

Abstract

The paper outlines the results of electrochemical processing of HAS32-VI heat-resistant alloy in nitric acid solutions. The main technological idea is based on running an electrochemical process at a controlled anodic potential value, thus providing for a preferential transition into nickel solution with nickel as basis metal, and synthesis of a cathodic product – metal nickel with purity of at least 95 %. Experiments in electrochemical dissolution of the said alloy were conducted using a nitric acid solution with concentration of 100 g/l at different values of anodic potential. It was determined that at Еa = 1,05 V cathodic product contains, %: Ni – 94,9, Re – 0,2, Co – 4,7, Cr – 0,1. The study determines that introduction of chloride ion (20 g/l) into the nitric acid electrolyte has no significant effect on the process parameters: the amount of nickel in anodic slime is reduced from 2,4 to 1,6 % with no significant increase of nickel content in the cathodic product. An exception is a considerable increase in the transition speed of rhenium into electrolyte: after a 10-hour process, rhenium concentration in a nitric acid electrolyte was 1,26 g/l; in a nitric acid electrolyte with addition of chloride ion – 8,90 g/l. The study demonstrates that the process of electrochemical dissolution of Re-containing heat-resistant nickel-based alloys at a controlled anodic potential Еa = 1,05 V in nitric acid electrolytes provides for a one-stage synthesis of nickel concentrate with a purity of not less than 95 % and allows to concentrate rhenium in anodic slime.

About the Authors

O. V. Chernyshova
Institute of Fine Chemical Technologies, Moscow Technological University (119571, Russia, Moscow, Vernadskogo pr., 86).
Russian Federation

Cand. Sci. (Tech.), associate prof., Department of chemistry and technology of rare and dispersed elements, and nanoscale composite materials



D. V. Drobot
Institute of Fine Chemical Technologies, Moscow Technological University (119571, Russia, Moscow, Vernadskogo pr., 86).
Russian Federation

(Chem.), prof., head of Department of chemistry and technology of rare and dispersed elements, and nanoscale composite materials



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Review

For citations:


Chernyshova O.V., Drobot D.V. Single-stage synthesis of nickel concentrate in processing of rhenium-containing heat-resistant alloy. Izvestiya. Non-Ferrous Metallurgy. 2016;(5):17-23. (In Russ.) https://doi.org/10.17073/0021-3438-2016-5-17-23

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ISSN 0021-3438 (Print)
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