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 ...
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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 ...
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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 ...
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... 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...
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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 ...
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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 ].
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During iron ore agglomeration or pelletization, moist iron concentrate particles and flux materials are rolled into balls with the ... with bentonite, it is well known that using a western, or Wyoming, bentonite with high ... induration machine; and static loading in the travelling grate. Greenballs should not plastically
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FOR IRON ORE PELLE"nZATION By Larry A. Haas,1 Jeffrey A. Aldinger,2 and Robert K. Zahl3 ABSTRACT The Bureau of Mines investigated the use of organic binders as substitutes for bentonite in agglomerating iron ore concentrate. Over 30 organic binders were evaluated at several dosage levels in laboratory tests.
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fine concentrate. The most commonly employed one is pelletizing in iron ore industry. In pelletizing, iron ore, water and a binder are balled in a mechanical disc or drum to produce agglomerates. Bentonite is the most widely used binder. However, it is considered as an impurity due to its high SiO 2 and Al 2O 3 content. Many researchers have ...
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The goals stemming from the final reduction process are drawn back through the pelletization process to present a clear rationale for why each material can be used to control the pellet quality. Major inorganic binders such as bentonite, colemanite, and lime are examined along with less commonly used alternatives.
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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.
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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 ...
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In the production of iron ore concentrate pellets, binders are required to improve pellet green strength. The most popular binder for this purpose is bentonite clay, which is added at a rate of approximately % by weight of moist concentrate. Bentonite is a significant cost item in iron ore pelletization, and also contributes undesirable amounts of silica to the finished pellets.
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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;
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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
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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 ...
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A laboratory study was carried out to characterize the physical, chemical and mechanical properties of lime fluxed (varying basicity 02) 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 ...
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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 ...
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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 ...
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The functions and molecular structure of organic binders for iron ore pelletization have been investigated in this paper based on the basic principles of molecular design, interface chemistry and polymer science as well as failure model of binding systems. The following conclusions are achieved. Functionally, good organic binders for iron ore ...
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Bentonite and calcium hydroxide are the widely used binding materials in iron ore pelletizing plants. This investigation deals with studying the effect of using a mixture of both binders on the ...
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1. Introduction. The binder is an important additive widely applied in pelletizing iron ore concentrates, making iron ore pellets available as feedstocks for blast furnace ironmaking or direct reduction processes [1,2,3].Bentonite clay, due to its excellent effectiveness and relatively low cost, has been the predominant binder for pellet production since 1950s [4,5,6].
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ture is required, as well as a binder agent, for instance bentonite or Portland cement. The mixture is sent to the extrusion machine to obtain the agglomerated product [8]. Pelletization Pelletization is an agglomeration process of iron ore concentrates with a granulometry lower than 150 m and low concentration of impurities [10, 11].
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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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