Preparation of Monoclinic Pyrrhotite by Thermal Decomposition of Jarosite Residues and Its Heavy Metal Removal Performance

Jarosite residues produced by zinc hydrometallurgical processing are hazardous solid wastes. In this study, monoclinic pyrrhotite (M-Po) was prepared the pyrolysis of jarosite in H2S atmosphere. The influence gas speed, reaction temperature, and time considered. mineral phase, microstructure, elemental valence solids before after were analyzed using X-ray diffraction, scanning electron microscopy, photoelectron spectroscopy, respectively. performances M-Po on removal Zn Pb from aqueous solution evaluated. results show to be sole product at temperatures 550 575 °C. Most particles nanometer scale display xenomorphic morphology. phase evolution process during is suggested as → hematite/magnetite pyrite pyrite+M-Po M-Po+hexagonal (H-Po) H-Po. formation rate, crystallinity, surface microtexture controlled temperature time. Incomplete sulfidation may produce coarse with core–shell (where core oxide shell sulfide) triple-layer sulfate, interlayer oxide, structures. °C exhibits an excellent heavy metal ability, which has adsorption capacities 25 mg/g for 100 pH ranges 5 6. This study indicates that high-temperature a novel efficient method treatment utilization residues.