blackmetИзвестия высших учебных заведений. Черная МеталлургияIzvestiya. Ferrous Metallurgy0368-07972410-2091National University of Science and Technology "MISIS"10.17073/0368-0797-2020-11-12-952-959blackmet-2018Research ArticleФИЗИКО-ХИМИЧЕСКИЕ ОСНОВЫ МЕТАЛЛУРГИЧЕСКИХ ПРОЦЕССОВPHYSICO-CHEMICAL BASICS OF METALLURGICAL PROCESSESОпределение условий селективного восстановления железа из железомарганцевой рудыDefinition of conditions of selective iron reduction from iron-manganese oreКосдаулетовН.KosdauletovN.

аспирант кафедры пирометаллургических процессов

454080, Россия, Челябинск, пр. Ленина, 76

Postgraduate of the Chair "Pyrometallurgical Processes"

Chelyabinsk

kosdauletovn@susu.ruРощинВ. Е.RoshchinV. E.

д.т.н., профессор, главный научный сотрудник кафедры пирометаллургических процессов

454080, Россия, Челябинск, пр. Ленина, 76

Dr. Sci. (Eng.), Professor, Chief Researcher of the Chair "Pyrometallurgical Processes"

Chelyabinsk

roshchinve@susu.ruЮжно-Уральский государственный университетРоссияSouth Ural State UniversityRussian Federation2020020120216311-12952959Copyright © Косдаулетов Н., Рощин В.Е., 20212021Косдаулетов Н., Рощин В.Е.Kosdauletov N., Roshchin V.E.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://fermet.misis.ru/jour/article/view/2018

Представлены результаты термодинамического моделирования процесса восстановительного обжига железомарганцевой руды с высоким содержанием фосфора в присутствии твердого углерода. Моделирование выполнено с использованием программного комплекса ТЕРРА. Исследовано влияние температуры процесса в интервале 950 – 1300 К и содержания углерода в количестве 8,50 – 8,85 г на 100 г руды на восстановление железа, марганца и фосфора. Железо при таких параметрах системы восстанавливается и твердым углеродом, и оксидом углерода CO до металлического состояния, а марганец только до оксида MnO. Степень восстановления фосфора зависит от количества восстановителя. При избытке углерода относительно восстановления железа весь фосфор переходит в металл при температуре 1150 К. При температуре меньше 1150 К и таком количестве углерода фосфор не восстанавливается. Процесс твердофазного восстановления железа из марганцевой руды с сохранением марганца в оксидной фазе опробован в лабораторных условиях. Представлены экспериментальные результаты прямого восстановления этих элементов углеродом и косвенного восстановления оксидом углерода CO. Эксперименты проведены в лабораторной печи Таммана при температуре 1000 – 1300 °C и выдержке в течение 1 и 3 ч. Приведены результаты исследования фазового состава продуктов восстановления, а также химический состав фаз. Подтверждена возможность селективного твердофазного восстановления железа твердым углеродом до металлического состояния. Оксидом углерода CO железо при исследованных условиях восстанавливается и переходит в магнитную часть. При магнитном разделении продуктов восстановительного обжига руды с твердым углеродом и оксидом углерода СО немагнитная часть содержит оксиды марганца, кремния и кальция. Результаты работы могут быть использованы при разработке теоретических и технологических основ переработки железомарганцевых руд, которые существующими технологиями не перерабатываются.

The article presents thermodynamic modeling results of reduction roasting of ferromanganese ore with a high phosphorus content in the presence of solid carbon. The modeling was carried out using TERRA software package. Influence of the process temperature in the range 950 – 1300 K and carbon content in the amount of 8.50 – 8.85 g per 100 g of ore on reduction of iron, manganese and phosphorus was investigated. With these parameters of the system, iron is reduced by both solid carbon and carbon monoxide CO to the metallic state, and manganese is reduced only to MnO oxide. The degree of phosphorus reduction depends on the amount of reducing agent. With an excess of carbon relative to the reduction of iron, all phosphorus is converted into metal at a temperature of 1150 K. Phosphorus is not reduced at temperatures below 1150 K and such amount of carbon. The process of solid-phase reduction of iron from manganese ore with the preservation of manganese in the oxide phase was researched in laboratory conditions. Experimental results of direct reduction of these elements with carbon and indirect reduction with carbon monoxide CO are presented. The experiments were carried out in the laboratory Tamman furnace at a temperature of 1000 – 1300 °C and holding time of 1 and 3 hours. Results of the research of phase composition of the reduction products, as well as chemical composition of the phases are considered. The possibility of selective solid-phase reduction of iron with solid carbon to the metallic state was confirmed. Iron in the studied conditions is reduced by carbon monoxide CO and passes into magnetic part. During the magnetic separation of the products of ore reduction roasting with solid carbon and carbon monoxide CO, the non-magnetic part contains oxides of manganese, silicon and calcium. The work results can be used in development of theoretical and technological foundations for the processing of ferromanganese ores, which are not processed by existing technologies.

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The authors declare that there are no conflicts of interest present.