Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2022

Ключевые слова: cryptocrystalline graphite, desulfurization, electro-explosive impulse activation, mechanical activation, oxidative leaching

Аннотация: An increase in the carbon content in cast iron and steel during smelting is carried out by adding carbon-containing materials to the charge - carburizers (carburetors). For the fastest and most complete assimilation of carbon, the carburetor must have a minimum amount of impurities and a low ash content. As the ash content of the carburizer decreases, the amount of slag also decreases, which in turn increases the durability of the furnace lining. To prevent the cast iron from becoming unnecessarily saturated with sulfur, the carburetor must contain a minimum amount of sulfur. Currently, coals and natural graphites are widely used as carburetors. Compared to other carbon-containing materials, natural graphites are of limited use because of the high sulfur content, which is represented by pyrite (polysulfide form) or is in the sulfide form in the form of disseminations and aggregative accumulations 2 x 1 mm in size. Therefore, the aim of the work is to develop graphite desulfurization technologies that allow reducing the sulfur content to 0.05%. In this work, mechanical activation, electroexplosive impulse activation, and oxidative leaching were used to desulphurize graphite. It is shown that each of the proposed methods intensifies all subsequent processes of sulfur extraction from graphite, more fully disclosing it from pyrite, pyrrhotite and chalcopyrite particles. Various combinations of these methods make it possible to obtain graphite of the required purity. Processing of graphite according to schemes, including electroexplosive-pulse processing followed by oxidative leaching and mechanical activation, followed by electroexplosive-pulse processing and oxidative leaching, makes it possible to reduce the sulfur content 1 to 0.16-0.21%. At the same time, the use of a combined scheme, including mechanical activation and oxidative leaching, reduces the sulfur content in the composition of graphite to 0.06-0.09%, replacing the oxidative leaching operation with steam treatment of graphite, to 0.05%. © 2022. Asian Research Publishing Network (ARPN). All Rights Reserved.

Журнал: ARPN Journal of Engineering and Applied Sciences

Выпуск журнала: Vol. 17, Is. 4

Номера страниц: 416-423

ISSN журнала: 18196608

Издатель: Asian Research Publishing Network

• Gilmanshina T.R. (Department of Engineering Baccalaureate CDIO, Institute of Non-Ferrous Metals and Materials Science, Siberian Federal University, Krasnoyarsk, Russian Federation)
• Koroleva G.A. (Department of Fundamental Natural Science Education, Institute of Non-Ferrous Metals and Materials Science, Siberian Federal University, Krasnoyarsk, Russian Federation)
• Dubova I.V. (Department of Fundamental Natural Science Education, Institute of Non-Ferrous Metals and Materials Science, Siberian Federal University, Krasnoyarsk, Russian Federation)
• Vasyunina N.V. (Department of Nonferrous Metals Metallurgy, Institute of Non-Ferrous Metals and Materials Science, Siberian Federal University, Krasnoyarsk, Russian Federation)
• Lytkina S.I. (Department of Materials Science and Materials Processing Technologies, Polytechnic Institute, Siberian Federal University, Krasnoyarsk, Russian Federation)
• Masanskii O.A. (Department of Materials Science and Materials Processing Technologies, Polytechnic Institute, Siberian Federal University, Krasnoyarsk, Russian Federation)
• Khudonogov S.A. (Department of Applied Mechanics, Polytechnic Institute, Siberian Federal University, Krasnoyarsk, Russian Federation)
• Berezyuk V.G. (Department of Materials Science and Materials Processing Technologies, Polytechnic Institute, Siberian Federal University, Krasnoyarsk, Russian Federation)
• Vonog V.V. (Department of Foreign Languages for Engineering, Siberian Federal University, Krasnoyarsk, Russian Federation)

• Scopus
• Ядро РИНЦ (eLIBRARY.RU)