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Process for the production of sulfuric acid and of sulphur trioxide, by using the residues of pyrites toasted containing ferrous oxide and with the simultaneous and complete combustion of the sulphur still contained in the form of a sulfide pyrites
Process for the production of sulfuric acid and of sulphur trioxide, by using the residues of pyrites toasted containing ferrous oxide and with the simultaneous and complete combustion of the sulphur still contained in the form of a sulfide pyrites