Phosphorus partitioning and recovery of low-phosphorus iron-rich compounds through physical separation of Linz-Donawitz slag

Dilip Makhija, Rajendra Kumar Rath, Kaushik Chakravarty, Abhay Shankar Patra, Asim Kumar Mukherjee, Akhilesh Kumar Dubey

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    Dilip Makhija, Rajendra Kumar Rath, Kaushik Chakravarty, Abhay Shankar Patra, Asim Kumar Mukherjee, and Akhilesh Kumar Dubey, Phosphorus partitioning and recovery of low-phosphorus iron-rich compounds through physical separation of Linz-Donawitz slag, Int. J. Miner. Metall. Mater., 23(2016), No. 7, pp.751-759. https://dx.doi.org/10.1007/s12613-016-1289-x
    Dilip Makhija, Rajendra Kumar Rath, Kaushik Chakravarty, Abhay Shankar Patra, Asim Kumar Mukherjee, and Akhilesh Kumar Dubey, Phosphorus partitioning and recovery of low-phosphorus iron-rich compounds through physical separation of Linz-Donawitz slag, Int. J. Miner. Metall. Mater., 23(2016), No. 7, pp.751-759. https://dx.doi.org/10.1007/s12613-016-1289-x
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    Phosphorus partitioning and recovery of low-phosphorus iron-rich compounds through physical separation of Linz-Donawitz slag

    • Research and Development Division, Tata Steel Ltd., Jamshedpur, 831001, India

    • Mineral Processing Division, CSIR-National Metallurgical Laboratory, Jamshedpur, 831007, India

    • Raw Material Blending and Bedding Section, Tata Steel Ltd., Jamshedpur, 831001, India

    基金项目: 

    The authors thank the Research & Development Division and Management of Tata Steel Ltd. for their support and permission to publish this work. The authors also appreciate the helpful discussion and suggestions provided by Dr. Tamal Kanti Ghosh during the course of our research work on the dephosphorization of LD slag.

    中文摘要

    The Linz-Donawitz (LD) steelmaking process produces LD slag at a rate of about 125 kg/t. After metallic scrap recovery, the non-metallic LD slag is rejected because its physical/chemical properties are unsuitable for recycling. X-ray diffraction (XRD) studies have indicated that non-metallic LD slag contains a substantial quantity of mineral phases such as di- and tricalcium silicates. The availability of these mineral phases indicates that LD slag can be recycled by iron (Fe)-ore sintering. However, the presence of 1.2wt% phosphorus (P) in the slag renders the material unsuitable for sintering operations. Electron probe microscopic analysis (EPMA) studies indicated concentration of phosphorus in dicalcium silicate phase as calcium phosphate. The Fe-bearing phases (i.e., wustite and dicalcium ferrite) showed comparatively lower concentrations of P compared with other phases in the slag. Attempts were made to lower the P content of LD slag by adopting various beneficiation techniques. Dry high-intensity magnetic separation and jigging were performed on as-received samples with particle sizes of 6 and 3 mm. Spiral separation was conducted using samples ground to sizes of less than 1 and 0.5 mm. Among these studies, grinding to 0.5 mm followed by spiral concentration demonstrated the best results, yielding a concentrate with about 0.75wt% P and 45wt% Fe.

     

    Phosphorus partitioning and recovery of low-phosphorus iron-rich compounds through physical separation of Linz-Donawitz slag

    Author Affilications

      • Research and Development Division, Tata Steel Ltd., Jamshedpur, 831001, India

      • Mineral Processing Division, CSIR-National Metallurgical Laboratory, Jamshedpur, 831007, India

      • Raw Material Blending and Bedding Section, Tata Steel Ltd., Jamshedpur, 831001, India

    • Funds: 

      The authors thank the Research & Development Division and Management of Tata Steel Ltd. for their support and permission to publish this work. The authors also appreciate the helpful discussion and suggestions provided by Dr. Tamal Kanti Ghosh during the course of our research work on the dephosphorization of LD slag.

    • Received: 28 October 2015; Revised: 26 January 2016; Accepted: 21 February 2016;
    The Linz-Donawitz (LD) steelmaking process produces LD slag at a rate of about 125 kg/t. After metallic scrap recovery, the non-metallic LD slag is rejected because its physical/chemical properties are unsuitable for recycling. X-ray diffraction (XRD) studies have indicated that non-metallic LD slag contains a substantial quantity of mineral phases such as di- and tricalcium silicates. The availability of these mineral phases indicates that LD slag can be recycled by iron (Fe)-ore sintering. However, the presence of 1.2wt% phosphorus (P) in the slag renders the material unsuitable for sintering operations. Electron probe microscopic analysis (EPMA) studies indicated concentration of phosphorus in dicalcium silicate phase as calcium phosphate. The Fe-bearing phases (i.e., wustite and dicalcium ferrite) showed comparatively lower concentrations of P compared with other phases in the slag. Attempts were made to lower the P content of LD slag by adopting various beneficiation techniques. Dry high-intensity magnetic separation and jigging were performed on as-received samples with particle sizes of 6 and 3 mm. Spiral separation was conducted using samples ground to sizes of less than 1 and 0.5 mm. Among these studies, grinding to 0.5 mm followed by spiral concentration demonstrated the best results, yielding a concentrate with about 0.75wt% P and 45wt% Fe.

     

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