Effect of Basicity on the Reduction Behavior of Iron Ore Pellets

Mohanty, Manoja Kumar; Mishra, Srishti; Mishra, B.; Sarkar, S.

doi:10.1007/s13369-018-3107-4

Cited by 26 publications

(7 citation statements)

References 13 publications

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“…Based on the iron oxide reduction theory of pellets [14,19,25], this paper divides the reduction and swelling process of pellets prepared from Bayan Obo iron ore concentrate into three stages [14,17,[26][27][28][29]:…”

Section: Introductionmentioning

confidence: 99%

Mechanism on reduction swelling of pellets prepared from Bayan Obo iron ore concentrate

Fan

Zhang

et al. 2021

Ironmaking & Steelmaking

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The composition of Bayan Obo iron ore concentrate is complex. If a large proportion is used to prepare pellets, abnormal swelling will occur during blast furnace smelting. This paper studies the swelling behavior of pellets prepared from Bayan Obo iron ore concentrate in stages during the reduction process; XRD and SEM-EDS analysis and calculates the crystal parameters of the reduction products in each stage. The results show that the total RSI of pellets prepared from Bayan Obo iron ore concentrate is as high as 35%, and the third stage of reduction has the maximum swelling rate, which is 24%. The mechanisms of the three stages reduction swelling of pellets are the crystal transformation, the effect of slag phase and the growth of iron whiskers. The results can enrich the reduction swelling theory of pellets prepared from complex intergrowth minerals.

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Section: Introductionmentioning

confidence: 99%

Mechanism on reduction swelling of pellets prepared from Bayan Obo iron ore concentrate

Fan

Zhang

et al. 2021

Ironmaking & Steelmaking

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“…7) The increase in basicity, namely the ratio of the lime to silica (C/S), of which the value was less than 1.6, was found to accelerate the degree of reduction (DOR) and degree of metallization (DOM). 8) However, a further increase in C/S ratio resulted in a decreasing reduction rate due to the formation of calcium ferrite phases. Therefore, an accurate analysis of the reduction process of iron oxide pellets requires a clear understanding of the interactions between various rate steps and factors.…”

Section: Introductionmentioning

confidence: 99%

“…................ (8). According to the assumption, the internal diffusion rate r D was regarded as a constant under steady or quasi steady diffusion conditions, thus .............. (9).…”

mentioning

confidence: 99%

Experimental and Modeling Study on Reduction and Heat Transfer Characteristics of Single Iron Ore Pellet in H<sub>2</sub>/CO Atmospheres

Shen

Sun

et al. 2023

ISIJ Int.

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“…Compared with lump ores and sinters, pellets are considered to have a higher iron grade, uniform particle size and lower coke consumption [1]. The negative impacts of traditional furnace burden on energy resource consumption and environmental pollution concerns have been increasing in recent decades, which stimulated extensive efforts to develop fluxed pellets with better quality and metallurgical properties to replace parts of the sinters and lump ores [2,3]. Up to now, the role of fluxed pellets has received ever-increasing attention in metallurgical research.…”

Section: Introductionmentioning

confidence: 99%

Influence of Basicity and Calcium-Containing Substances on the Consolidation Mechanism of Fluxed Iron Ore Pellets

Chen

Guo

et al. 2022

Metals

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The application of fluxed pellets in iron making industry has attracted considerable attention because of the better metallurgical properties than acid pellets and environmental friendliness compared to sinters. However, fluxed pellets with different binary basicity (CaO/SiO2) exhibited significant differences in phase composition, microstructure and consolidation mechanism. These differences mainly stemmed from the influence of calcium-containing substances in fluxed pellets. Herein, the theoretical investigation discovered the calcium-containing substances from fluxed pellets, including calcium iron silicate, calcium silicate and complex calcium ferrite (SFCA), which determined the properties of fluxed pellets. Microstructure analysis revealed that the calcium-containing substances filled between hematite particles were used as a binding phase to assist in pellets’ consolidation. Furthermore, the calcium-containing binding phase formed in the low-basicity (0.4–1.0) pellets was mainly composed of the calcium iron silicate glassy phase, while the binding phase of the high-basicity (1.0–1.2) pellets was dominated by SFCA belonging to SiO2-Fe2O3-CaO-Al2O3 multivariate system. In comparison, SFCA exhibited better crystallinity and reducibility than calcium iron silicate. Within the roasting temperature range of 1200–1250 °C, the increase of basicity contributed to the fluxed pellets obtaining better strength. To sum up, fluxed pellets with SFCA as the main calcium-containing binding phase can be obtained by increasing the basicity above 1.0–1.2, which was imperative for further improving the physical and metallurgical properties of fluxed pellets.

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Effect of Basicity on the Reduction Behavior of Iron Ore Pellets

Cited by 26 publications

References 13 publications

Mechanism on reduction swelling of pellets prepared from Bayan Obo iron ore concentrate

Mechanism on reduction swelling of pellets prepared from Bayan Obo iron ore concentrate

Experimental and Modeling Study on Reduction and Heat Transfer Characteristics of Single Iron Ore Pellet in H<sub>2</sub>/CO Atmospheres

Influence of Basicity and Calcium-Containing Substances on the Consolidation Mechanism of Fluxed Iron Ore Pellets

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