scholarly journals Model for the approximate assessment of nitrogen content in swollen reduced iron ore from single measurements

Athenea ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 47-53
Author(s):  
Oscar Dam G.
Keyword(s):  
Metallic Iron ◽  
Iron Ore ◽  
Extractive Metallurgy ◽  
Reduction Process ◽  
Iron Formation ◽  
Iron Oxide Particles ◽  
Accurate Analysis ◽  
Iron Ore Pellets ◽  
Ore Pellets ◽  
Institute Of Technology

A method of calculation has been derived to assess the nitrogen estimated content in iron reduced samples. The method is based on the review of observations and laboratory measurements of relationships between the rate of reduction and the corresponding metallic iron formation during the reduction process. The metallic iron formation has been calculated from relationships that apply to a wide variety of types of ores undergoing reduction under a nitrogen-containing gas mixture in proportions above 50% by volume. The empirical correlations found between the rates of metallization, the sample swelling index, and the equilibrium nitrogen solubility in iron can be used for determined the approximate final content of nitrogen in the reduced samples from the estimated and measured final volume of the reduced specimens. It is necessary to have an accurate analysis of the starting sample as well as the reducibility information. Keywords: Iron ore, nitriding, catastrophic swelling, rate of metallization, reduction degree. [1]M. Kumar, B. Himanshu & S. Kumar. “Reduction and Swelling of Fired Hematite Iron Ore Pellets by Non−coking Coal Fines for Application in Sponge Ironmaking”. Mineral Processing and Extractive Metallurgy Review- MINER PROCESS EXTR METALL REV. 34. 10.1080/08827508.2012.656776. 2012. [2]I. Mikko, M. Olli, A. Tuomas, V. Ville-Valtteri, K. Jari, P. Timo & F. Timo. “Dynamic and Isothermal Reduction Swelling Behaviour of Olivine and Acid Iron Ore Pellets under Simulated Blast Furnace Shaft Conditions”. ISIJ International. 52. 1257-1265. 10.2355/isijinternational.52.1257. 2012. [3]M. Kumar. “Study of reduction kinectics of iron ore pellets by noncoking coal”. Thesis of Master. National Institute of technology, Rourkela. 2009. [4]O. Dam. “The Influence of Nitrogen on the Swelling Mechanism of Iron Oxides During Reduction”. PhD Thesis .Univ. of London. 1983. [5]O. Dam and J. Jeffes. “Model for the Assessment of Chemical Composition of reduced iron ores from single measurements”. Ironmaking and Steelmaking Journal. Vol. 14, N`5. 1987. [6]O. Dam. “Efecto de la descomposición de gas de amoniaco (NH3) sobre el hinchamiento de óxidos de hierro durante reducción”. UCT Journal. Vol 100, 24. May 2020. [7]R. Agarwal and S. Hembram. “To Study the Reduction and Swelling Behavior Iron Ore Pellets”. BSc. Department of Metallurgical and Materials Engineering National Institute Of Technology, Rourkela. May 2013 [8]Z. Chen , C. Zeilstra , J. Van der Stel , J. Sietsma & Y. Yang. “Review and data evaluation for high-temperature reduction of iron oxide particles in suspension”. Ironmaking & Steelmaking. Vol. 47. N°7. pp. 741-747. 2019.

Effect of Mineralogy on Reduction Behaviour of Iron Ore Pellets

2020 ◽  
Vol 978 ◽  
pp. 525-531
Author(s):  
Anand Babu Kotta ◽  
Swapan Kumar Karak ◽  
Mithilesh Kumar
Keyword(s):  
Iron Ore ◽  
Reduction Process ◽  
Time Interval ◽  
Iron Ores ◽  
Iron Ore Pellets ◽  
Ore Pellets ◽  
Reduction Behaviour ◽  
Before And After ◽  
Iron Iron ◽  
Coal Fines

The present study deals with impact of gangue amount (Al2O3, SiO2) in iron ores on reduction of its pellets for production of sponge iron. Iron ore pellets were reduced isothermally with noncoking coal fines in the range of 1123 - 1273 K with a time interval of 15, 30,45,60,90 and 120 min. As the temperature rose from 1123 to 1223 K, the reducibility index of iron ore pellets increased and then decreased at temperature 1273 K. All iron ore pellets shows complete reduction at temperatures of 1173 and 1223 K within 120 minutes. The reduction results clearly show that the reducibility of the pellets depends on the initial mineralogy of the ore. It was also observed that the reducibility decreased as gangue content (Al2O3 + SiO2) increases. The activation energy of the pellets decreased from 46.54 and 49.13 kJ/mol when the gangue content increased. The pellets were metallographically characterized before and after reduction to identify phase transformations. Examination of the SEM microphotographs revealed that Whisker shape of iron grains were formed during the reduction process and clear porous structure was observed.

Effect of Temperature on Morphology of Metallic Iron and Formation of Clusters of Iron Ore Pellets

2015 ◽  
Vol 47 (1) ◽  
pp. 85-88 ◽  
Author(s):  
Jean Philippe Santos Gherardi de Alencar ◽  
Valdirene Gonzaga de Resende ◽  
Luiz Fernando Andrade de Castro
Keyword(s):  
Metallic Iron ◽  
Iron Ore ◽  
Effect Of Temperature ◽  
Iron Ore Pellets ◽  
Ore Pellets

Production Process Optimization of Mongolian Iron Ore Pellets for Baogang Group

2015 ◽  
Vol 751 ◽  
pp. 35-39
Author(s):  
Zhuo Tuan Guo ◽  
Yong Guo ◽  
Di Wu ◽  
Jun Peng ◽  
Yong Bing Wang ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Production Process ◽  
Iron Ore ◽  
Reduction Process ◽  
Expansion Rate ◽  
Iron Ore Pellets ◽  
Ore Pellets ◽  
Preheating Temperature ◽  
Roasting Temperature ◽  
Roasting Time

Baogang Group imported large quantities of Mongolian iron ore to solve the shortage of ironmaking raw materials. But the basic parameters of Mongolian iron ore in pellets production are deficient. In this paper, orthogonal experimental method was used in the optimization of roasting production process of Mongolian iron ore pellets. The results show that when the content of Mongolian iron ore is 55%, the factors affecting the expansion rate of pellets in order of decrease is bentonite proportion, roasting temperature, roasting time and preheating temperature. For pellets containing 55% Mongolian iron ore, the optimum roasting schemes are as follows: bentonite proportion at 3.3%, roasting temperature at 700°C, roasting time at 14 minutes and preheating temperature at 1280°C. Under this roasting scheme, the expansion rate of pellets is 13.41%, and the compression strength reaches 2275N, which meets the technological requires of large blast furnace. The main phase of the Mongolian iron ore pellets is hematite, with a porosity of 25%-30%. And the content of gangue and liquid phase is relatively low, which is beneficial to the reduction process of pellets in blast furnace.

scholarly journals An Analytical Way to Comparing the Affective Parameters on Iranian Pellet Strength

2020 ◽  
Vol 4 (1) ◽  
pp. 35-41
Author(s):  
Y. Shajari ◽  
A. Reyhanizadeh ◽  
N. Towhidi ◽  
Z. S. Seyedraoufi ◽  
H. Bakhtiari
Keyword(s):  
Iron Ore ◽  
Direct Reduction ◽  
Steel Production ◽  
Reduction Process ◽  
Sponge Iron ◽  
Production Chain ◽  
Iron And Steel ◽  
Iron Ore Pellets ◽  
Ore Pellets ◽  
Iron And Steel Production

Iron ore pellets are the raw materials for direct reduction process of iron ore to sponge iron pellets and is an important step in the iron and steel production chain. Many of the defects in direct reduction and steel making processes could be identify in the iron ore processing stage. Therefore, the purpose of this study was to select the correct suppliers of iron ore pellets for direct reduction units based on criteria affecting the strength of cooked pellets, which played a key role in optimizing the production criteria of sponge iron and ultimately increasing production efficiency in the steelmaking stage which can be very effective. For this purpose, using the hierarchical analysis model, the parameters affecting the strength of pellets have been identified and studied by experts of several iron and steel production units, and finally, for example, several iron ore pellet production plants have been compared and ranked. According to AHP decision criteria, particle size is the most important parameter affecting the strength of cooked pellets.

Effects of gangue compositions on reduction process of carbon-bearing iron ore pellets

2018 ◽  
Vol 25 (11) ◽  
pp. 1105-1112 ◽  
Author(s):  
Qing-min Meng ◽  
Jia-xin Li ◽  
Ru-fei Wei ◽  
Hong-ming Long ◽  
Tie-jun Chun ◽  
...  
Keyword(s):  
Iron Ore ◽  
Reduction Process ◽  
Iron Ore Pellets ◽  
Ore Pellets
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