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The Mössbauer spectra obtained at 296 K of ZPR roasted: (a) without additions at 600 °C; (b) with addition of 48% Fe2(SO4)3 at 600 °C, then additionally calcined at 900 °C; (c) with addition of 48% Fe2(SO4)3 at 600 °C, water-leached, then additionally calcined at 900 °C.
