Jul 17, 2021 Lots of studies have indicated that the low melting point slag phases can facilitate the reduction swelling of iron ore pellets [21,22,23, 26]. In this study, the fired pellets at the basicity of 0.40 and 0.60 show higher RSI value and lower RI value than the fired pellets at natural basicity and basicity of 1.00 (Fig. 4 ) because they contain ...

May 24, 2021 CONCLUSIONS. (1) Under increased consumption of molten pig iron of 980 kg/t and more, the slag formation process is complicated due to the presence in the slag of refractory compounds (calcium orthosilicate) and a low content of iron oxides. (2) To solve the problem, the technology of iron-ore pellet addition has been developed in the converter ...

SYNOPSIS Ammasi. A Traditionally, bentonite is used as the most common binder in iron ore pelletization from the very beginning. It gives good bonding property to green and dry pellets at ambient as well as elevated temperature. However, bentonite contains around 60% silica and 18 % alumina that proportionally increase the alumina and silica content in pellet and increases slag volume and ...

Jul 18, 2012 Highlights Organic binders and colemanite were tested as alternative binder to bentonite. Colemanite was more effective than bentonite to get sufficient strength. Firing temperature can be lowered with addition of colemanite. Low firing temperatures will be beneficial to save energy in pelletization plants. Bonding mechanism was physical melting at the contact points of iron ore grains.

Jul 11, 2018 The iron ore production has significantly expanded in recent years, owing to increasing steel demands in developing countries. However, the content of iron in ore deposits has deteriorated and low-grade iron ore has been processed. The fines resulting from the concentration process must be agglomerated for use in iron and steelmaking. This chapter shows the status of the pelletizing process ...

Aug 06, 2020 After melting the direct reduced iron (DRI), exchange reac-tions will take place between the initially formedslagandthe molteniron.Theunre-duced oxides, viz., the remaining iron oxide, the main part of all other oxides inherent to the ore, and the additives and binders added during pellet making,[4] will participate in slag formation. To ...

A laboratory study was carried out to characterize the physical, chemical and mechanical properties of lime fluxed (varying basicity 0-2) hematite iron ore pellets. Lime was used as additive as well as fluxing agent for making iron ore pellets. The effect of additives on different properties of pellets was studied. The findings show that on increasing the addition of lime, more of calcium ...

When the pellet was added into hot metal bath (carbon-containing molten iron), it was decomposed, melted, and transformed to produce low melting oxidizing slag, because it is a combination of main CaO and Fe 2 O 3 . This slag is suitable for facilitating P and C removal in refining.

Jan 01, 2012 Green pellets are made by combining moist ore with a binder and rolling it into balls using either a pelletizing disk or a pelletizing drum. The green pellets are then dried, preheated, and finally heated to a temperature below the melting point of iron oxides, approximately 1300 C, to achieve strength. The fired pellets are typically ...

alternative binders to bentonite for iron ore pelletizing -part ii: effects on metallurgical and chemical properties By osman sivrikaya Pelletization of magnetite ore with colemanite added organic binders

The addition of a low-melting temperature and slag bonding/strength increasing constituent (free in acidic contents) into pellet feed was proposed. ... iron ore, pelletizing, binder, bentonite ...

This study was conducted to investigate how insufficient pellet strengths can be improved when organic binders are used as binder. The addition of a low-melting temperature and slag bonding ...

Dec 01, 1995 @article{osti_129112, title = {Organic binders for iron ore pelletization and steelmaking}, author = {Karkoska, D and Sankey, E and Anderson, R}, abstractNote = {Historically, bentonite has been used in the agglomeration process in North American iron ore plants. In 1986, Eveleth Mines replaced bentonite with Peridur, a carboxy methyl cellulose organic binder used in conjunction with 1% limestone.

Feature of iron-ore cold-bonded composite pellets is, raw materials pellletizing with a cold-hardening binder. Bentonite is the most widely used binder in iron ore pelletizing.

The main drawback of the binders commonly used in iron ore based composite pellets is the presence of impurities like silica and alumina that are undesirable in iron making [19, 25]. In contrast ...