Sulfur process for purifying pyrite ashes of non ferrous metals arsenic and
Abstract
Abstract A PROCESS FOR PURIFYING PYRITE OR PYRRHOTITE ASHES BY REMOVAL THEREFROM NON-FERROUS METALS, ARSENIC AND SULFUR. THE PROCESS WHICH COMPRISES ADMIXING PYRITE WITH SAID PYRITE ASHES COMING FROM A ROASTING FURNACE AT 500*800*C., SAID PYRITE BEING IN QUANTITIES OF FROM 25-200 KG. OF FES2 PER TON OF ASH, DEPENDING ON THE TEMPERATURE OF THE ASHES. TREATING THE PYRITE ASH/PYRITE ADMIXTURE IN A FLUID BED AT 850*-950*C. WITH A MIXTURE OF CHLORINE AND OXYGEN CONTAINING GASES IN WHICH THE CHLORINE IS EQUAL TO 105-120% OF THE STOICHIOMETRIC WITH RESPECT TO THE NON-FERROUS METALS AND TO THE ARSENIC PRESENT IN THE ASHES AND IN THE ADMIXED PYRITE. THE OXYGEN IS IN SUCH A QUANTITY THAT THE OUTFLOWING GASES CONTAIN FROM 0.5 TO 5% BY VOLUME O2.
Inventors
- 👤 Colombinia
- 👤 B Viviani
- 👤 G Sironi
Bibliographic Details
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