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Slag Activation in the Carbothermic Reduction of Phosphorite with Adding Micronutrient-Bearing Cosolvents

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Abstract

High smelting temperature of phosphate ore and low activity of the slag lead to energy-extensive consumption and large solid waste generation in the yellow phosphorus industry. Micronutrient-bearing cosolvents were added to the reduction smelting process of phosphate ore to reduce the smelting temperature and increase the activity of slag in the current work. Thermodynamic analysis demonstrated that B2O3 and K2O as cosolvents can decrease the melting temperature, promote the liquid phase formation and reduce the slag viscosity. In addition, cosolvents had no unfavorable effect on the reduction volatilization of phosphate ore, and the volatilization ratio of phosphorus was > 97 wt.% at 1550°C for 1 h. In this case, the value of slag was enhanced with the addition of cosolvents, and the activation ratios of micronutrients were > 90%. Resultantly, no solid waste was generated since the activated slag can be regarded as a favorable ingredient for the crop fertilizer.

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Acknowledgements

The authors express their thanks to the National Key Research and Development Program of China (Nos. 2016YFD0200401, 2018YFC1900200), the Program for Innovative Research Team (in Science and Technology) in University of Henan Province (No. 19IRTSTHN028) and the Special Support Program for High Level Talents in Henan Province (No. ZYQR201912182) for the financial support.

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  1. Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education, Zhengzhou University, Zhengzhou, 450001, China

    Hongquan Jing, Cuihong Hou, Haobin Wang, Yuan Yao & Bingbing Liu

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  1. Hongquan Jing
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  2. Cuihong Hou
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Correspondence to Bingbing Liu.

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Jing, H., Hou, C., Wang, H. et al. Slag Activation in the Carbothermic Reduction of Phosphorite with Adding Micronutrient-Bearing Cosolvents. JOM 73, 941–950 (2021). https://doi.org/10.1007/s11837-020-04558-x

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  • DOI: https://doi.org/10.1007/s11837-020-04558-x

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