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

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Abstract

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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Authors and Affiliations

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

    Dilip Makhija, Kaushik Chakravarty, Abhay Shankar Patra & Asim Kumar Mukherjee

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

    Rajendra Kumar Rath

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

    Akhilesh Kumar Dubey

Authors
  1. Dilip Makhija
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  2. Rajendra Kumar Rath
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  3. Kaushik Chakravarty
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  4. Abhay Shankar Patra
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  5. Asim Kumar Mukherjee
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  6. Akhilesh Kumar Dubey
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Correspondence to Dilip Makhija.

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Makhija, D., Rath, R.K., Chakravarty, K. et al. Phosphorus partitioning and recovery of low-phosphorus iron-rich compounds through physical separation of Linz-Donawitz slag. Int J Miner Metall Mater 23, 751–759 (2016). https://doi.org/10.1007/s12613-016-1289-x

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  • DOI: https://doi.org/10.1007/s12613-016-1289-x

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