1
Colombo Umberto, Sironi Giuseppe, Viviani Bruno, Colombini Ariano: Process for the purification of pyrite cinders from nonferrous metals, from arsenic and from sulfur. Montecatini Edison, March 14, 1972: US3649245 (6 worldwide citation)

A process for the purification of pyrite and pyrrhotite cinders from nonferrous metals, from arsenic and from sulfur. The process is characteristic in that the reduction of the hematite to magnetite is carried out in a fluid bed by direct injection of a hydrocarbon fuel and air in deficiency, at 850 ...


2
Colombini Ariano, Viviani Bruno, Sironi Giuseppe: Purification of iron pyrites cinders. Montedison, August 18, 1971: GB1242938-A (2 worldwide citation)

1,242,938. Purifying roasted iron pyrites. MONTECATINI EDISON S.p.A. 7 July, 1969 [8 July, 1968], No. 34115/69. Heading C1A. Iron pyrites cinders (haematite) is freed from arsenic and non-ferrous metals by reducing the cinders, using air and a carbonaceous fuel, at 850-950 C. with a contact time of ...


3
Veronica Giacinto, Sironi Giuseppe, Colombini Ariano: Arsenic removal from iron minerals. Montedison, September 16, 1970: GB1205453-A (1 worldwide citation)

1,205,453. Arsenic removal from iron minerals. MONTECATINI EDISON S.p.A. 18 Oct., 1967 [21 Oct., 1966], No. 47530/67. Heading C1A. Arsenic is removed from iron minerals and pyrite cinders by adding lime or limestone, heating to 800-1000 C. in an oxidizing atmosphere, separating at a particle size of ...


4

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Dolombo Umberto, Sironi Guiseppe, Viviani Bruno, Colombini Ariano: Purification of pyrite cinders. Montedison, June 23, 1971: GB1236345-A

1,236,345. Purification of pyrite cinders. MONTECATINI EDISON S.p.A. 28 July, 1969 [26 July, 1968], No. 37760/69. Heading C1A. Pyrite or pyrrholite cindersare purified by reducing the cinders in a fluidized bed by means of a hydrocarbon fuel and air at 850-950 C. in the presence of hydrogen chloride ...



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