Humic substancebased binder (HB) has been found to be an effective substitution for bentonite in the production of iron ore pellets. In this study, it was found that the preheating time needed to be prolonged during the pelletization processing which is a remarkable feature of pellets with HB instead of bentonite.
In the pelletization process, the iron ore fines are converted into green pellets using drum or disc pelletizer, wherein binder and moisture are added to provide the necessary green strength. The green pellets being fragile are subsequently transferred to induration furnace, wherein the green pellets get fired to achieve the desired properties ...
The present application of binders used in the iron ore industries indicates that the most common binder is bentonite, which is generally added as % by weight of iron [10, 11]. It has proved to be the most effective binder due to its high water adsorption capacity and dry film strength [ 12 ].
M/s Rashmi Metaliks Limited has been set up a million TPA Iron Ore Pelletization Plant at village Gokulpur, Shyamraipur, and Tehsil Kharagpur, in Paschim Midnapur district of West Bengal ... Iron ore fines 11,00,000 0 10 Orissa, Jharkhand TransportRail Bentonite 20,000 Bhuj, Gujarat Rail Coke 30,000 0 6 Australia Ship ...
Any pellet binder is subject to a handful of practical requirements: that it be readily dispersed through a pellet, that it effectively controls the movement of water within the pellet, and that it contributes to the interparticle bonding within the pellet.
In the magnetite iron ore pelletization process, oxidation of magnetite followed by sintering of the oxidized magnetite (hematite) is desirable. Optimum preheating time temperature and roasting time temperature is required to get the desired properties of the pellets with magnetite, hematite, and hematitemagnetite blend. In order to utilize the magnetite resources in a current ...
Yet, bentonite does not undergo any such chemical reactions within pellets. Instead, bentonite physically binds to iron ore particles. Bentonite additionally controls excess water within the pellet. Sodium bentonite in particular can absorb around 900% PWA, allowing pelletization moistures to remain considerably more consistent than without binder.
Pelletization studies have been carried out on high alumina and high LOI iron ore nes as per present pellet plant induration machine conditions (Table 4) to know the quality of the pellets. Table 3 Pellet green mix proportion Raw material % Iron ore nes Dolomite Coke breeze Bentonite
1. Introduction. Iron ore pellets are an essential part of the blast furnace charge, with high grade, good strength, uniform particle size, good metallurgical properties, and so forth. 1,2 Especially, fluxed iron ore pellets have better hightemperature soft fusion performance and reduction performance. 3−5 However, the burden of the blast furnace is still dominated by a high proportion of ...
... Several studies and research have already been conducted to test organic binders as alternative binders to bentonite [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21]. A combination of...
Iron Ore Pelletization: Part I. Fundamentals. ABSTRACT The behavior of iron ore pellet binders is complex. Any pellet binder is subject to a handful of practical requirements: that it be readily dispersed through a pellet, that it effectively controls the movement of water within the pellet, and that it contributes to the interparticle bonding ...
ABSTRACT This part reviews the goals of introducing organic binders into iron ore pelletization. Organic binders present a relatively small number of unique binding options but provide an extraordinary amount of flexibility in how to apply them. The key factors that lead into an effective organic binder are good dispersion into the iron ore, the ability to maintain the dispersion of the iron ...
Iron ore pellets are essential inputs for producing direct reduced iron (DRI), but the conventional binders, used in iron ore pelletizing, introduce gangue oxides to the DRI and consequently increase the slag generation and energy consumption in the steelmaking unit.
The iron ore pelletizing process consists of three main steps: Pelletizing feed preparation and mixing: the raw material (iron ore concentrate, additives —anthracite, dolomite —and binders are prepared in terms of particle size and chemical specifications, dosed, and mixed together to feed the pelletizing process;
The majority of iron ores must be ground to a fine particle size to allow the iron oxides they contain to be concentrated, and the concentrate must then be agglomerated back into large enough particles that they can be processed in blast furnaces. The most common agglomeration technique is pelletization, which requires the use of binders to hold the iron oxide grains together so that the ...
binders added to bentonite, to form a hybridbinder system for Iron Ore Pelletization. The kinetics of the agglomeration process and resulting properties of green pellets
Iron ore pellets are spheres of typically 616 mm ( in) to be used as raw material for blast furnaces. They typically contain 6472% Fe and various additional material adjusting the chemical composition and the metallurgic properties of the pellets. [3] Typically limestone, dolomite and olivine is added and Bentonite is used as binder.
The residue of bentonite after roasting mainly contains SiO 2 and Al 2 O 3, leading to a ~ % decrease in pellets iron content for every % increase in bentonite content of raw materials ...
ABSTRACT The addition of pellet binders often represents a compromise between the pellet grade and quality measures as strength, reducibility, and dustiness. Each inorganic compound present within the pellet plays a specific role in each aspect of creating a highquality pellet. This review seeks to clarify the roles of both binders and coincidentally present inorganic compounds to highlight ...
Pellet ore not only has excellent metallurgical and mechanical properties, but is also an important metallurgical raw material used to solve the problem of increasing depletion of global highgrade iron ore resources. Bentonite has long been widely used in pellet ore production, which is not only expensive but also causes serious metallurgical pollution. Organic binders can form stronger ...
Bentonite solutions have viscous, variable, and lubricant properties. Different types of bentonites influence pellet properties, as well as the interaction among heterogeneous or homogeneous bentonites and iron concentrate [ 3 6 ]. In this study, we utilized three different types of bentonites for a pelletizing test.
Iron Ore Pelletizing Process: An Overview 43 Pellets produced to be used in ironmaking processes must have characteristics that meet the list of quality...
As known, in order to produce green pellets, bentonite binder (< 1 wt%) and moisture (89 wt%) is added to the iron ore concentrates powder with particle size of less than 45 microns. Then, the mixture of raw materials is transformed into the 916 mm diameter green pellet by balling disk [ 5 ].
CCS was measured for 20 pellets in a compression testing machine (SETT2000, Shanta Engineering, Mumbai, India) following the standard procedure of ISO 4700. ... Bentonite is the most common binder to be used in iron ore pelletization. However, bentonite contributes to additional alumina and silica in the pellet, decreasing the iron content ...
Addition of 1% bentonite to an iron ore concentrate results in a lowering of acid pellet iron content by % [1]. ... Structurally, good organic binders for iron ore pelletization should contain sufficient polar groups (X) and hydrophilic groups (Y) and possess the structure mold like [X P Y] n. Ionization potential, electron affinity, group ...
Molasses was used as an alternative binder to the bentonite binder. The change in moisture absorption by pellets prepared with different iron ores and different molasses contents were investigated. Iron ore properties exerted the major effect on pellet behavior and final pellet quality. The absorbed moisture content of pellets prepared without binder, bentoniteadded pellets, and molasses ...
The pelletization process is the primary consumer of binders in the iron ore industry. The selection of an appropriate binder type and dosage is of critical importance in producing good quality pellets at a reasonable price. Binders accomplish two very important functions in iron ore pelletization: .
ABSTRACT Humic substances exist widely in lignite coal as high molecular weight organic molecules. They can be used as binders in iron ore pelletization mostly in the form of salt, such as sodium humate and amine humate via extraction from lignite coal. It is worth determining if lignite can be used as a binder without extraction. As a composite binder of organic and inorganics, due to the ...
Keywords: HA, modified bentonite, characterization, iron ore, pelletization Abstract A new kind of iron ore pellet binder named humic acid modifying bentonite (HAMB) has been developed by the author's group, which has the advantages of both organic HA and inorganic bentonite. The green pellet strength can be obviously improved by
Comparison Between High Pressure Frozen Iron OreBentonite Slurry and Plunge Frozen Iron Ore Pellet. A similar microstructure was found for bentonite in the high pressure frozen iron orebentonite slurry, as shown in Figure 3a, close to a large magnetite particle corresponding to the bright region on the lefthand side of the expected, the microstructure of welldispersed smectite ...
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