Effect of modified humic acid (MHA) binder on roasting behavior of mongolian “Tumurtei” iron ore concentrate briquettes
https://doi.org/10.17073/0368-0797-2020-6-419-427
Abstract
There are two major groups of binder: organic and inorganic binder for agglomeration process for reduction, and sintering for steel production. In this work, effect of composite binder on roasting of Mongolian “Tumurtei” iron ore concentrate briquettes in ambient atmosphere was studied, aiming to clarify optimal parameters of roasting behavior with three different MHA binders for direct reduction. Lignite contains organic and inorganic substances, and according to many previous investigations, it can be raw material for extraction of composite binder. Pressed iron concentrate with MHA binder was subjected to oxidation and reduction process in the electrical furnace. The optimum conditions of experiments were as follows. Parameters of briquetting process were carried out according to the no-binder briquetting test 0.75 t·cm–2 pressure, 5 seconds pressing time, 8 % of moisture content, oxidation at 950 °C under air flow for 10 min, and reduction at 1100 °C under CO atmosphere. As a result, MHA binder extracted from “Baganuur” lignite affected the reduction degree higher than another two binders in this study. Total iron content in reduced iron is attained to 98.33 % with 1 % of MHA extracted from “Baganuur” lignite. Reduction degree can be expressed by loss of oxygen.
About the Authors
Bayaraa Saraatanbazar
School of Minerals Processing and Bioengineering, Central South University
China
China
Ph.D. Student
410083, Changsha, Hunan
Guang-hui Li
School of Minerals Processing and Bioengineering, Central South University
China
China
Professor
410083, Changsha, Hunan
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Review
For citations:
Saraatanbazar B., Li G. Effect of modified humic acid (MHA) binder on roasting behavior of mongolian “Tumurtei” iron ore concentrate briquettes. Izvestiya. Ferrous Metallurgy. 2020;63(6):419-427. https://doi.org/10.17073/0368-0797-2020-6-419-427
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