The study for reduction roasting of laterite residue in the presence of CaF2

Cao, Zhihe; Ma, Baozhong; Zhou, Jiashun; Chen, Yongqiang; Wang, Chengyan

doi:10.1016/j.psep.2022.09.053

Cited by 10 publications

(2 citation statements)

References 34 publications

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“…However, the case with slaked lime only had a slight decrease compared to other additives, and the melting temperatures of samples C1.2-SL and C1.2-F6-SL were both higher than the experimental temperature of 1250 °C. The most significant decrease in melting temperature (235 °C) was obtained for the case with CaF2 of 9.85 wt%, demonstrating the conducive role of CaF2 in the formation of the ferronickel concentrate [29]. Moreover, sample C1.4-F12-B2 exhibited the lowest melting temperature of 950 °C, indicating that the addition of H3BO3 contributed to the formation of molten slag, which was aligned with the experimental results in Figure 7e,f.…”

Section: Thermodynamic Equilibrium and Melting Temperature Calculationsupporting

confidence: 86%

“…Therefore, increasing the temperature can significantly increase the CO formation and the iron and nickel reduction rates, thereby shortening the reaction time. The high temperature also facilitates the melting of the reduced ferronickel alloy and accelerates the separation of the ferronickel alloy from the ore. Based on our previous work and previously reported research [25][26][27][28][29], the reduction temperature in this work was set as 1250 • C.…”

Section: Reductants and Additivesmentioning

confidence: 99%

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High-Grade Ferronickel Concentrates Prepared from Laterite Nickel Ore by a Carbothermal Reduction and Magnetic Separation Method

Zhang,

Cao,

Xue

et al. 2023

Materials

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Nickel is widely used in industrial processes and plays a crucial role in many applications. However, most of the nickel resource mainly exists as nickel oxide in laterite nickel ore with complex composition, resulting in difficulty in upgrading the nickel content using physical separation methods. In this study, high-grade ferronickel concentrates were obtained through a carbothermal reduction and magnetic separation using laterite nickel ore and anthracite as raw materials. The effects of different types of additives (CaF2, Na2SO4, and H3BO3), carbon ratio (the molar ratio of oxygen atoms in the laterite nickel ore to carbon atoms in anthracite), and grinding time on the recoveries and grades of ferronickel concentrates were experimentally investigated, along with the microstructure and chemical composition of the products. CaF2 was proved to be the primary active additive in the aggregation and growth of the ferronickel particles and the improvement of the grade of the product. Under the optimal conditions of CaF2 addition of 9.85 wt%, carbon ratio of 1.4, and grinding time of 240 s, high-grade magnetically separable ferronickel concentrate with nickel grade 8.93 wt% and iron grade 63.96 wt% was successfully prepared. This work presents a practical method for the highly efficient recovery and utilization of iron and nickel from low-grade laterite nickel ore, contributing to the development of strategies for the sustainable extraction and utilization of nickel resources.

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Section: Thermodynamic Equilibrium and Melting Temperature Calculationsupporting

confidence: 86%