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PROCESSING AND COMPLEX USAGE OF MINERAL RAW MATERIALS
ArticleName Experimental validation of enhanced corrosion resistance of ferrosilicon in dense medium separation of refractory diamond-bearing materials
DOI 10.17580/gzh.2024.02.08
ArticleAuthor Dvoichenkova G. P., Chanturia V. A., Timofeev A. S., Chernysheva E. N.
ArticleAuthorData

Mirny Polytechnic Institute–Division of the Ammosov North-Eastern Federal University, Mirny, Russia1 ; Academician Melnikov Institute of Comprehensive Exploitation of Mineral Resources—IPKON, Russian Academy of Sciences, Moscow, Russia2

G. P. Dvoichenkova1,2, Chief Researcher, Professor, Doctor of Engineering Sciences, dvoigp@mail.ru

 

Academician Melnikov Institute of Comprehensive Exploitation of Mineral Resources—IPKON, Russian Academy of Sciences, Moscow, Russia
V. A. Chanturia, Chief Researcher, Academician of the Russian Academy of Sciences
A. S. Timofeev, Senior Researcher, Candidate of Engineering Sciences

 

Coraline Engineering, Moscow, Russia
E. N. Chernysheva, Production Engineer, Candidate of Engineering Sciences

Abstract

The article presents the comparative experimental studies and industrial testing data on the methods of increasing the corrosion resistance of ferrosilicon in order to reduce its losses in dense medium separation of refractory diamond-bearing materials. The integrated analytical and laboratory studies show that the maximum corrosion resistance of components of the ferrosilicon suspension is achieved using the electrochemical, physical and physicochemical methods used for modifying the surface properties of ferrosilicon granules and the parameters of the aqueous phase of the technological process. The results of bench tests show that the use of electrochemically treated water in the dense medium separation process reduces ferrosilicon losses in the ferrosilicon suspension regeneration cycle at its consumption decreased by 1.9 times. The pilot tests of a dense medium separation scheme demonstrate that replacing oxygencontaining air by inert gas nitrogen in the cycle of preparation and mixing during storage of a ferrosilicon suspension increases the service life of ferrosilicon by 1.5 times while reducing the process losses by 2.5 times. The results of the laboratory, bench and pilot tests prove that nitriding of ferrosilicon to create a nitride shell 30–60 nm thick on ferrosilicon surface ensures stability of ferrosilicon granules when they interact with corrosive elements of circulating water in the dense medium separation process, with an increase in the service life of ferrosilicon by 2.2 times and at the loss reduction by 2.7 times. The technological effectiveness of the developed methods for increasing the corrosion resistance of ferrosilicon is confirmed on an industrial scale of dense medium separation at diamond recovery plants of ALROSA.

keywords Ferrosilicon, suspension, granules, corrosion, properties, electrochemical treatment, inert gas, nitriding
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