آخرین محصولات
Reduction Behavior of Dolomite-Fluxed Magnetite: Coke Composite Pellets
High-temperature behavior of magnetite—coke composite pellet fluxed with dolomite was investigated by customized thermogravimetric analyzer (TGA) at 1573 K (1300 °C). The overall reaction was influenced by C/O ratio and dolomite content. The …
Studies on reduction behaviour of highly fluxed iron ore pellets …
Hardening behaviour of highly fluxed iron ore pellets was studied and explained in detail by the authors in their earlier report [4]. Table 1. Chemical Analysis of Raw Materials. ... 'Reduction kinetics of hematite and magnetite pellets containing coal char. ISIJ Int., 23 (1983), pp. 490-496. Crossref View in Scopus Google Scholar [14]
(PDF) Reduction Behavior of Dolomite-Fluxed Magnetite: …
Reduction Behavior of Dolomite-Fluxed Magnetite: Coke Composite Pellets at 1573 K (1300 °C) Metallurgical and Materials Transactions B - United States doi 10.1007/s11663-018-1208-9
Use of Oxygen-Enriched Gas for the Oxidation of Acid …
Use of Oxygen-Enriched Gas for the Oxidation of Acid and Fluxed Taconite Pellets Author: pau0 Created Date: 11/21/2002 3:59:47 PM ...
Characterization of Fluxed Iron Ore Pellets as Compared to …
Friel and Erickson (1980) had also made good quality dolomite fluxed magnetite pellets with MgO contents vary from 1-2 wt % and CaO/SiO2 ratios from 0.6 to 1.3. Specifically, compositions within these ranges have good physical properties (tumble >98 %, compressive strength > 2670 N), and they are significantly more reducible and soften ...
Phase transition mechanism of high-silica fluxed pellets …
An in-depth study of the consolidation behaviour of high-silica fluxed pellets will help promote the development of a high-proportion pellet smelting process suitable for …
Developing the Oxidation Kinetic Model for Magnetite Pellet
Oxidation is a vital phenomenon for magnetite pellets in their excursion through the furnace during induration. One of the pre-requisites for magnetite pellets to achieve homogeneously structured good quality pellets is to have complete oxidation before sintering begins. Partially oxidized magnetite pellets, upon sintering, might result in inhomogeneous …
Chemistry of Dolomite-Fluxed Hematite and Magnetite Pellets …
Dolomite-fluxed pellets of various compositions were made from magnetite concentrate, hematite concentrate and a concentrate containing a natural mixture of both. Physical properties and reduction test results were used to ascertain proper compositions and firing temperatures. These pellets were subjected to physical tests and to reduction tests. Petrographic and …
Kinetics of Oxidation Reaction for Magnetite Pellets
An experiment for the oxidation process of single magnetite pellet and theoretical analysis based on modified unreacted core shrinking (MUCS) model were carried out, and the …
Phase transition mechanism of high-silica fluxed pellets …
Compared with acid pellets, the suitable preheating temperature of high-silica fluxed pellets is higher (1100°C). The phase transformation during preheating consists mainly of the thermal decomposition of CaCO 3 and Ca (OH) 2 and the reaction between the solid phases.The roasting temperature of high-silica fluxed pellets should be controlled ...
Chemistry Of Dolomite-Fluxed Hematite And Magnetite Pellets
The addition of dolomite to iron ore pellets improves their high-temperature reduction properties primarily by increasing their reducibility and raising their softening temperature. In this study we prepared dolomite-fluxed pellets from three different concentrates; Hibbing, a magnetic taconite, Knob Lake, an earthy hematite; and Carol Lake, a mixture of specular hematite with magnetite.
US20230220513A1
The present invention discloses additive for reducing the roasting temperature of fluxed magnetite pellets and a method of using it, consisting of components: B2O3, Mn2O3, the B2O3 and Mn2O3 are pure chemical reagents, the mass of the additive is 0.8%, 4% of the dry basis mass of the magnetite concentrate, respectively, the magnetite concentrate, bentonite clay, …
Reduction Behavior of Dolomite-Fluxed Magnetite: …
Reduction Behavior of Dolomite-Fluxed Magnetite: Coke Composite Pellets at 1573 K (1300 C) HYUNSIK PARK, IL SOHN, JOHN TSALAPATIS, and VEENA SAHAJWALLA High-temperature behavior of magnetite—coke composite pellet fluxed with dolomite was investigated by customized thermogravimetric analyzer (TGA) at 1573 K (1300 C). The overall
Interactions between Magnetite Oxidation and Flux …
The results from the mathematical model for isothermal oxidation-calcination of a simulated iron ore pellet showed that the addition of limestone …
Mechanisms in oxidation and sintering of magnetite iron ore …
Oxidation mechanisms and thermal volume changes in magnetite iron ore pellets as a function of raw material fineness and pellet porosity are shown. When a pellet starts to …
Utilization of Lime Fines as an Effective Binder as well as …
Utilization of Lime Fines as an Effective Binder as well as Fluxing Agent for Making Fluxed Iron Ore Pellets O. P. Sinha 2015, Journal of The Institution of Engineers (India): Series D
CHEMISTRY OF DOLOMITE-FLUXED HEMATITE AND MAGNETITE PELLETS…
This study prepared dolomite-fluxed pellets from Hibbing, a magnetic taconite; Knob Lake, an earthy hematite; and Carol Lake, a mixture of specular hematite with magnetite.
Sci-Hub | Phase Equilibria and Slag Formation in the Magnetite …
Firth, A. R., Garden, J. F., & Douglas, J. D. (2008). Phase Equilibria and Slag Formation in the Magnetite Core of Fluxed Iron Ore Pellets. ISIJ International, 48(11 ...
COMPARISON OF SINTER AND PELLET USAGE IN AN …
global seaborne trade, pellet feed and fired pellet sales have grown at a faster rate. Hatch anticipates that fired pellet and pellet feed sales will further accelerate at the expense of sinter feed due to declining availability of high-quality sinter fine resources. In Figures 1 and 2, the growth of the seaborne trade and Hatch's
Use of oxygen-enriched gas for the oxidation of acid and fluxed …
"The U.S. Bureau of Mines, in cooperation with Cleveland-Cliffs, Inc. (Hibbing, Minnesota), investigated ways of enhancing the quality (compressive strength, after-tumble and reducibility) of domestic acid and fluxed magnetite pellets by modifying the oxygen content during the preheat and induration periods of the firing operation.
Phase Equilibria and Slag Formation in the Magnetite Core …
Experiments were then conducted with pellet sized magnetite compacts, held at a temperature between 1075 and 1225°C for 20 min in a nitrogen atmosphere containing 0.5% oxygen (p O …
Liquid phase formation behaviour of magnesia fluxed pellet …
Alkalinity and MgO content are studied on the influence of liquid and the liquid distribution of magnesia fluxed pellet by using FactSage software. Basicity and the content of …
Reduction Behavior of Dolomite-Fluxed Magnetite: …
High-temperature behavior of magnetite—coke composite pellet fluxed with dolomite was investigated by customized thermogravimetric analyzer (TGA) at 1573 K (1300 C). The overall
Impact of Initial Titanium Magnetite Ore Material Composition on Fluxed
Download Citation | Impact of Initial Titanium Magnetite Ore Material Composition on Fluxed Pellet Metallurgical Properties | Research work was carried out on the test units with the conditions ...
Pelletization of hematite and synthesized magnetite …
Pellets of synthesized magnetite at 1250 °C and hematite at 1360 °C have CCS > 250 kg/pellet, porosity > 25%. • Synthesized magnetite pellet achieved 3.49% RDI, 80.21% RI …
Reduction Behavior of Dolomite-Fluxed Magnetite: Coke Composite Pellets
High-temperature behavior of magnetite—coke composite pellet fluxed with dolomite was investigated by customized thermogravimetric analyzer (TGA) at 1573 K (1300 °C). The overall reaction was influenced by C/O ratio and dolomite content. The reduction was accelerated by increased amount of dolomite, while the samples with higher C/O ratio showed …
Thermal Implications of Phase Transformations during …
0.18atm) to minimise magnetite formation, magnetite being stabilised by lower oxygen partial pressures. This has a major influence on the phases formed due to the reduced phase …
Reduction Behavior of Dolomite-Fluxed Magnetite: Coke …
High-temperature behavior of magnetite—coke composite pellet fluxed with dolomite was investigated by customized thermogravimetric analyzer (TGA) at 1573 K (1300 …
Morphology and reduction kinetics of fluxed iron ore pellets
It is shown that the chemical reaction is the rate limiting factor for fluxed composite pellets, and the mass transport of reactant gas through the reaction product iron layer governs the overall reduction process in the case of fluxed ore pellets. Microscopic analysis of the fluxed composite pellets has indicated no tendency to form a ...
Influence of flux additives on iron ore oxidized pellets
Six additives, i.e., limestone, lime, magnesite, magnesia, dolomite and light-burned-dolomite, were added for investigating their influences on the pellet quality. For green balls, adding lime and light-burned-dolomite makes the wet drop strength decrease firstly, and then increase with further increase of additive dosage. Ca(OH)2 affects the bentonite properties at …
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