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A detailed investigation of physical and chemical properties of pyrite cinders from sulfuric acid production has been carried out by employing variety of analytical methods and techniques, including ICP-MS, XRL, XRD, M\"ossbauer Spectroscopy, SEM-EDX, SQUID, TGA, etc. The study is focused on the investigation of the content and distribution of about 50 micro- and trace elements in magnetically separated fractions, and among/within individual particles. It has been found that many heavy metals exist in easily avail...