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.
Highlights
Steel is one of the most important much applied, and low cost metal materials in modern industry
There is a lack of steel production from iron ore, especially for direct reduction plants for steel making in Mongolia
The drop damage resistance and compressive strength of the green briquettes are shown in Fig. (4b), with respect to the different stoichiometric amounts of modified humic acid (MHA) binder under optimized briquetting load of 0.75 ton for fine magnetite (+80 % of –0.074 mm fraction) concentrate
Summary
Steel is one of the most important much applied, and low cost metal materials in modern industry. At present the scale of the steel industry is constantly expending, iron and steel production technology is developing and improving. According to statistics of the International Iron and Steel Association, the production of crude steel in the world increased in 64 countries reporting 151.7 million tones (Mt) in August 2018, a 2.6 % increase compared to August 2017 [2]. Direct reduced iron is main source of crude steel mak ing, and its production constantly increases due to the increase of steel production as shown in Fig. There is a lack of steel production from iron ore, especially for direct reduction plants for steel making in Mongolia. According to statistics of the Mineral Resource Agency of Mongolia, mining products account for 16 % of gross domestic product (GDP), and 70 % of total industrial product at last three years [4]
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