Investigating the Effect of Bentonite Heat Treatment Cycle on the Properties of Iron Ore Pellets

Document Type : Original Article

Authors

Paya Sanat Sama Company, Isfahan Science and Technology Town Isfahan 84156-83111, Iran

Abstract

Introduction and Objectives: The quality of produced pellets is directly dependent on the physicochemical properties of the bentonite used. This research aims to investigate the effect of heat treatment on the characteristics of bentonite and to evaluate the properties of the obtained raw and fired pellets.
Materials and Methods: In this study, the impact of heat treatment on the properties of bentonite, as a binder additive in a pelletizing unit, was investigated. A sample of sodium bentonite from South Khorasan mines was selected as the raw material. Following thermal analyses, temperatures of 400, 800, and 1300 °C were chosen as heat treatment temperatures. X-ray diffraction (XRD), elemental analysis, and scanning electron microscopy (SEM) were employed to analyze the phase and structural characteristics of the samples after heat treatment. Water absorption, swelling percentage of the samples, and the properties of pellets produced from the heat-treated bentonite were examined to assess the effect of heat treatment on bentonite properties.
Results: The results indicated that heat treatment led to structural and phase changes in bentonite. SEM images of raw bentonite revealed that the particle morphology and porosity of bentonite changed with increasing heat treatment temperature. Furthermore, the zeta potential test was utilized to compare the electrical potential difference between the layers of the samples. The results showed that heat-treated bentonite particles at 400 °C exhibited a lower tendency to settle.
Conclusion: The results of this study declared that heat treatment up to 400 °C improved the properties of bentonite and the obtained pellets.

Keywords

Main Subjects

References

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Journal of Advanced Materials in Engineering
Volume 44, Issue 4
2025
Pages 33-53

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