scholarly journals Microstructure and Minerals Evolution of Iron Ore Sinter: Influence of SiO2 and Al2O3

Minerals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 449 ◽  
Author(s):  
Ji ◽  
Zhao ◽  
Gan ◽  
Fan ◽  
Chen ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Calcium Silicate ◽  
Iron Ore ◽  
Sio2 Content ◽  
Al2o3 Content ◽  
Sinter Quality ◽  
Iron Ore Sinter ◽  
Research Findings ◽  
Functional Mechanisms ◽  
Sintering Processes

SiO2 and Al2O3 are two important minerals that can affect the mechanical and metallurgical properties of sinter. This investigation systematically studied the influences of these minerals and revealed their functional mechanisms on sinter quality. Results showed that with an increasing Al2O3 content in sinter, the sintering indexes presented an improvement before the content exceeded 1.80%, while the quality decreased obviously after the content exceeded 1.80%. With an increasing SiO2 content, the sinter quality presented a decreasing tendency, especially when the content exceeded 4.80%. Consequently, the optimal content of Al2O3 was ≤1.80% and that of SiO2 was ≤4.80%. The evolution of the microstructure and minerals in sinter showed that enhancing the Al2O3 content increased the proportion of SFCA generated, which improved the sinter’s mechanical strength, while excessive Al2O3 led to the formation of sheet-like SFCA with weak mechanical strength. Increasing the content of SiO2 strained the formation of SFCA and promoted the formation of calcium silicate, the mechanical strength of which is lower than that of SFCA. The research findings will be useful in guiding practical sintering processes.

scholarly journals Effects of Basicity and Al2O3 Content on the Chemistry of Phases in Iron Ore Sinter Containing ZnO

2020 ◽  
Vol 51 (6) ◽  
pp. 3016-3027
Author(s):  
Junwoo Park ◽  
Ramaraghavulu Rajavaram ◽  
In-Kook Suh ◽  
Jiwon Jeon ◽  
Sanghan Son ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Iron Ore ◽  
Bulk Composition ◽  
Atomic Emission ◽  
Rietveld Analysis ◽  
Al2o3 Content ◽  
Composition Analysis ◽  
X Ray ◽  
Inductively Coupled ◽  
Iron Ore Sinter

AbstractThe effects of basicity and Al2O3 content on the chemistry of phases in iron ore sinter containing ZnO were investigated by Rietveld analysis of the X-ray diffraction (XRD) patterns. Bulk composition analysis was carried out using inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and wet-chemical analysis. The composition of each phase was investigated using a scanning electron microscope-energy dispersive X-ray analyzer (SEM-EDX). It was found that ZnO exists in the franklinite and the silicoferrite of calcium and aluminum (SFCA) phases. With increasing ZnO content, the phase fraction of the franklinite increased, while the fraction of SFCA slightly increased. When ZnO content was fixed at 1 wt pct and basicity increased, the fraction of franklinite decreased and that of SFCA increased. Here, the solubility of ZnO in the SFCA increased. As the Al2O3 content increased, the fraction of franklinite decreased and that of SFCA increased, while ZnO content in the SFCA did not change significantly.

Influence of Coating Granulation Process on Iron Ore Sinter Quality and Productivity

2010 ◽  
Vol 81 (9) ◽  
pp. 716-723 ◽  
Author(s):  
T. Umadevi ◽  
A.V. Deodhar ◽  
P.C. Mahapatra ◽  
M. Prabhu ◽  
Madhu Ranjan
Keyword(s):  
Iron Ore ◽  
Granulation Process ◽  
Sinter Quality ◽  
Iron Ore Sinter

scholarly journals Influence of iron ore concentrate on the characteristics of sintering and reduction of sinter

2020 ◽  
pp. 24-24
Author(s):  
H. Guo ◽  
F.-M. Shen ◽  
X. Jiang ◽  
D.-W. Xiang ◽  
H.-Y. Zheng
Keyword(s):  
Liquid Phase ◽  
Calcium Silicate ◽  
Iron Ore ◽  
Raw Materials ◽  
Mineral Resources ◽  
Integral Form ◽  
Sio2 Content ◽  
Calcium Ferrite ◽  
Iron Ore Sintering ◽  
Bonding Phase

As the main iron ore importing country for China, the abundant mineral resources of Australian are the primary raw materials for the sintering production. To better understand the properties of different iron ore from Australia and then guide the sintering production, this study selected four types ore from Australian and one type ore from domestic, and their properties were investigated under different condition. The experiment of single iron ore sintering was studied to examine the influence of different iron ore on metallurgical properties of sinter. From this study, the following results were obtained: GG showed poor fluidity and higher assimilability temperature, but the bonding phase strength was the highest; YD showed better fluidity and lower assimilability temperature, whereas SJY (domestic ore) showed better fluidity and higher bonding phase strength, lower assimilability temperature. The influence mechanism of iron ore on the fluidity was further analyzed by using SEM and ion theory of slag. With the increase SiO2 content of iron ore, the fluidity index increased, the main reason was that the amount of liquid phase increased and melting point decreased during sintering. However, an excessive amount of SiO2 caused the decrease of fluidity index of iron ore, the main reason was that the fluidity of the liquid phase itself decreased and secondary hematite appeared. In the case of the SiO2 content of iron ore was higher, the main bonding phase was calcium silicate. With the decrease of SiO2 content, the calcium silicate transformed into calcium ferrite. This main reason was that the Gibbs free energy of calcium ferrite and dicalcium ferrite (2CaO?SiO2) was higher than that of calcium silicate in the temperature ranges of 400-1600 K. The reduction degree of YD was the highest in all the cases and that of GG was the lowest. Activation energies of 5.39, 3.14, 3.51, 4.47 and 2.92 kJ/mol were obtained for the reduction of GG, PB, BH, SJY, and YD, respectively. In all the cases, the reaction corresponded to the model function of F1(?), and the integral form was -ln(1-?)=kt. Through this investigation, it could be concluded that the most appropriate ore category for sinter pot was YD.

scholarly journals Effect of Cooling Methods on the Strength of Silico-ferrite of Calcium and Aluminum of Iron Ore Sinter during the Cooling Process

Metals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 402
Author(s):  
Xu Zhang ◽  
Hao Bai ◽  
Xin Lu ◽  
Tian He ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Iron Ore ◽  
Cooling Process ◽  
Slow Cooling ◽  
Iron Ore Sinter ◽  
Mass Fractions ◽  
Mechanical Strengths ◽  
Biot Numbers ◽  
Cooling Methods

In the iron making process, a high mechanical strength is favorable for iron ore sinters in the blast furnace, and the bonding phase is regarded as one of the key components that determines the quality of the iron ore sinter, in which the silico-ferrite of calcium and aluminum (SFCA) is one of the typical phases. In this study, synthesized samples with different SFCA mass fractions were prepared to study the effect of different cooling methods on the strengths of the SFCA samples. The results showed that the strength of a sample could be improved by increasing the SFCA content during a temperature change. Further, the test results for the compressive strength suggested that the SFCA had a positive effect on the strength of the iron ore sinter during cooling, with slow cooling being significantly effective at preventing the generation of thermal stress. Moreover, the Biot number was introduced to normalize all of the cooling methods. The results showed that higher mechanical strengths for iron ore sinters will be obtained with higher SFCA content and lower Biot numbers, which will guide the evaluation of mechanical strength of iron ore sinter after the cooling process in industry.

Additives produce strong and reducible iron ore sinter

JOM ◽  
1954 ◽  
Vol 6 (4) ◽  
pp. 449-452
Author(s):  
R. D. Burlingame ◽  
Gust Bitsianes ◽  
T. L. Joseph
Keyword(s):  
Iron Ore ◽  
Iron Ore Sinter

Prediction of Iron Ore Sinter Properties Using Statistical Technique

2016 ◽  
Vol 70 (6) ◽  
pp. 1661-1670 ◽  
Author(s):  
Vikash Kumar ◽  
S. D. S. S. Sairam ◽  
Satendra Kumar ◽  
Akhil Singh ◽  
Deepak Nayak ◽  
...  
Keyword(s):  
Iron Ore ◽  
Statistical Technique ◽  
Iron Ore Sinter

Determination of aluminium in iron ore and iron ore sinter by a complexometric method

The Analyst ◽  
1976 ◽  
Vol 101 (1204) ◽  
pp. 516 ◽  
Author(s):  
Samaresh Banerjee ◽  
R. K. Dutta
Keyword(s):  
Iron Ore ◽  
Complexometric Method ◽  
Iron Ore Sinter

Mathematical Modeling and Optimization of Iron Ore Sinter Properties

2007 ◽  
Vol 47 (3-4) ◽  
pp. 373-379 ◽  
Author(s):  
Eugene Donskoi ◽  
James R. Manuel ◽  
John M. F. Clout ◽  
Yimin Zhang
Keyword(s):  
Mathematical Modeling ◽  
Iron Ore ◽  
Modeling And Optimization ◽  
Iron Ore Sinter
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