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Optimization Extraction of Scandium from Scandium Concentrate with Titanium Dioxide Wastewater by Response Surface Methodology

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Abstract

Scandium concentrate and titanium dioxide wastewater (TDWW) all belong to waste, especially TDWW belongs to hazardous waste, it is urgent to find a more efficient and safer treatment method to deal with them, and both waste acid and waste ore contain scandium. The use of waste acid as a leaching agent can achieve the synergistic recovery effect of scandium. First, the leaching temperature, time, and liquid–solid ratio are found to be significant factors through single-factor tests. Then, the test program is designed by using the Box Behnken unit of Design Expert software to explore the relationship between each factor including leaching temperature (℃), leaching time (h), and liquid-to-solid ratio (mL/g). The results show that the interaction between leaching time and liquid–solid ratio was the strongest. The second-order regression model equation generated by the software can well predict the leaching effect of scandium. The scandium leaching efficiency reaches 85.30%, and the scandium content in the leaching residue decreases to 10.24 g/t under the optimal conditions: leaching temperature of 70 ℃, leaching time of 2.0 h, and liquid–solid ratio 8.7 mL/g. The finite element analysis is to simulate the mineral roasting process and the temperature field changes are always present.

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Acknowledgements

This study was funded by the Technology Innovation Center for Comprehensive Utilization of Strategic Mineral Resources, Ministry of Natural Resources (Grant No.CCUM-KY-2304), the Sichuan Province Central Government Guides Local Funds for Science and Technology Development (Grant Nos. 2023ZYD0028), the Sichuan Science and Technology Program (Grant Nos. 24NSFSC2150 and 2022YFS0509), and Sichuan Province Natural Resources Department project (KJ-2023-003).

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Authors and Affiliations

  1. School of Environment and Resource, Southwest University of Science and Technology, Mianyang, 621010, China

    Junhui Xiao & Nanlan Zhong

  2. Technology Innovation Center for Comprehensive Utilization of Strategic Mineral Resources, Ministry of Natural Resources, Chinese Academy of Geological Sciences, Chengdu, 610041, China

    Junhui Xiao, Renju Cheng & Junhui Zhang

  3. Applied Technology Innovation Center of Rare Earth Resources, China Geological Survey, Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences, Chengdu, 610041, China

    Junhui Xiao, Renju Cheng & Junhui Zhang

  4. Dongfang Boiler Group Co., Ltd., Zigong, 643001, China

    Junhui Xiao

  5. Sichuan Provincial Engineering Lab of Nonmetallic Mineral Powder Modification and High-Value Utilization, Southwest University of Science and Technology, Mianyang, 621010, China

    Junhui Xiao

  6. Key Laboratory of Ministry of Education for Solid Waste Treatment and Resource Recycle, Southwest University of Science and Technology, Mianyang, 621010, China

    Junhui Xiao

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  1. Junhui Xiao
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Correspondence to Junhui Xiao.

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Xiao, J., Zhong, N., Cheng, R. et al. Optimization Extraction of Scandium from Scandium Concentrate with Titanium Dioxide Wastewater by Response Surface Methodology. J. Sustain. Metall. 10, 278–295 (2024). https://doi.org/10.1007/s40831-024-00794-6

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