Journal of Scientific and Industrial Research

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Biomass Mediated Conversion of Acidic Phosphogypsum into Alkaline Material through Thermal Treatments


Affiliations
1 Environment & Sustainability Department, CSIR Institute of Minerals and Materials Technology, Bhubaneswar 751 013, Odisha, India
2 Academy of Scientific & Innovative Research, Ghaziabad 201 002, Uttar Pradesh, India
3 Paradeep Phosphates Limited, Paradeep 754 145, Odisha, India

The application of phosphogypsum waste is limited to alkaline soil primarily due to its highly acidic pH. Its application can be widen for the acidic soil by converting phosphogypsum into alkaline material. In this context, conversion of acidic phosphogypsum into alkaline material by mixing banana peduncle biomass in powder form in different proportions followed by thermal pyrolysis treatments (300–700°C) were investigated. Acidic phosphogypsum pH (3.2) increased without biomass mixing to 6.3, 6.6 and 7.4 at 300, 500 and 700°C, whereas phosphogypusm-biomass-mixtures elevated pH to relatively higher values 6.7–7.2, 8.2–9.6 and 10.1–10.4 respectively. Alkaline pyrolysed material also contained carbon (25.8%), potassium (10%), and sulfur (12%) and their toxic flouride concentration was lesser (0.39%) than raw phosphogypsum (0.44%). The XRD analysis revealed formation of water soluble anhydrite, arcanite, potassium calcium sulfate and calcite mineral phases. These results established and highlights about process of conversion of phosphatic fertiliser industry acidic phosphogypsum waste to nutrient rich alkaline material by utilising banana peduncle biomass through thermal treatment. The reseach findings has implication towards phosphogypsum industrial waste management, value addition and potential for its alternative use in acidic soils.
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  • Biomass Mediated Conversion of Acidic Phosphogypsum into Alkaline Material through Thermal Treatments

Abstract Views: 88  | 

Authors

Adnan Asad Karim
Environment & Sustainability Department, CSIR Institute of Minerals and Materials Technology, Bhubaneswar 751 013, Odisha, India
Manish Kumar
Environment & Sustainability Department, CSIR Institute of Minerals and Materials Technology, Bhubaneswar 751 013, Odisha, India
Arati Ray
Academy of Scientific & Innovative Research, Ghaziabad 201 002, Uttar Pradesh, India
D Hariprasad
Paradeep Phosphates Limited, Paradeep 754 145, Odisha, India
Nabin Kumar Dhal
Environment & Sustainability Department, CSIR Institute of Minerals and Materials Technology, Bhubaneswar 751 013, Odisha, India

Abstract


The application of phosphogypsum waste is limited to alkaline soil primarily due to its highly acidic pH. Its application can be widen for the acidic soil by converting phosphogypsum into alkaline material. In this context, conversion of acidic phosphogypsum into alkaline material by mixing banana peduncle biomass in powder form in different proportions followed by thermal pyrolysis treatments (300–700°C) were investigated. Acidic phosphogypsum pH (3.2) increased without biomass mixing to 6.3, 6.6 and 7.4 at 300, 500 and 700°C, whereas phosphogypusm-biomass-mixtures elevated pH to relatively higher values 6.7–7.2, 8.2–9.6 and 10.1–10.4 respectively. Alkaline pyrolysed material also contained carbon (25.8%), potassium (10%), and sulfur (12%) and their toxic flouride concentration was lesser (0.39%) than raw phosphogypsum (0.44%). The XRD analysis revealed formation of water soluble anhydrite, arcanite, potassium calcium sulfate and calcite mineral phases. These results established and highlights about process of conversion of phosphatic fertiliser industry acidic phosphogypsum waste to nutrient rich alkaline material by utilising banana peduncle biomass through thermal treatment. The reseach findings has implication towards phosphogypsum industrial waste management, value addition and potential for its alternative use in acidic soils.