Document Type : Case Study
Authors
- Saeed Omori 1
- Arezoo Abedi 1
- Kumars Seifpanahi-Shabani 1
- Hamid Abbasdokht 2
- Mohammad Ghafoori 3
- Mohammad Abasian 4
- Antony Van Der Ent 5
1 Department of Mining Engineering, Faculty of Mining, Petroleum & Geophysics Eng, Shahrood University of Technology, Shahrood, Iran
2 Department of Agronomy and Plant Breeding, Faculty of Agriculture, Shahrood University of Technology, Shahrood, Iran
3 Farhangian University, Shahid Modarres Campus, Sanandaj, Kurdistan, Iran
4 Department of Basic Sciences, Shahid Modarres Campus, Farhangian University, Sanandaj, Iran
5 Sustainable Minerals Institute, The University of Queensland, Brisbane, Australia
Abstract
This study evaluated the efficiency of the native hyperaccumulator Odontarrhena inflata in extracting nickel (Ni) from ultramafic soils in the Robat-Sefid region of northeastern Iran and assessed the feasibility of applying agromining under controlled conditions. A six-month greenhouse experiment was conducted using homogenized serpentine soil with a total Ni concentration of 1,460 mg/kg. By the end of the cultivation period, the aerial parts of the plant yielded 122 g of dry biomass containing 2,195 mg/kg of Ni. The calculated bioconcentration factor (BCF = 1.5) and translocation factor (TF = 3.53) confirmed effective Ni uptake and translocation from roots to shoots. The biomass was pyrolyzed at 550 °C to produce ash, which underwent cross-washing and sulfuric acid (H₂SO₄) leaching. This leaching process achieved a Ni extraction efficiency of 78.9%, and the overall Ni recovery from soil to biomass ash was estimated at 3.53%. Elemental analyses showed substantial reduction of Magnesium (Mg) and Iron (Fe) in the final crystalline product; however, Calcium (Ca) and Sodium (Na) remained at appreciable levels, indicating that further recrystallization or purification steps are necessary to achieve industrial-grade ANSH (ammonium nickel sulfate hexahydrate). Compared with other Ni hyperaccumulators, O. inflata exhibited lower shoot Ni levels than Odontarrhena chalcidica and Alyssum murale, but the combination of its strong ecological adaptability, elevated TF, and native occurrence collectively designates it as a sustainable and promising candidate for agromining applications in nickel-rich soils of Iran.
Keywords
Main Subjects
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