PROCESS AND PLANT FOR THE REDUCTION OF HEXAVALENT CHROMIUM CONTAINED IN THE RESIDUE RESULTING FROM THE PROCESSING OF CHROMIUM MINERALS - Patent 0621905

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EP 0 621 905 A1

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(43)	Date of publication:
	02.11.1994 Bulletin 1994/44

(21)	Application number: 93902135.0

(22)	Date of filing: 29.12.1992

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International Patent Classification (IPC):

C01G 37/ 00^{( . )}
C22B 34/ 32^{( . )}

C22B 5/ 08^{( . )}

(86)	International application number:
	PCT/EP1992/003007

(87)	International publication number:
	WO 1993/014232 (22.07.1993 Gazette 1993/18)

(84)	Designated Contracting States:
	DE GB IT

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Priority:

21.01.1992 IT 1992MI00092

(71)	Applicant: LUIGI STOPPANI S.p.A.
	I-20123 Milan (IT)

(72)	Inventors:
	BRUZZONE, Giuseppe I-17019 Varazze (IT) PERRONE, Diego I-16016 Cogoleto (IT) BRUNO, Giacomo I-16038 Santa Margherita Ligure (IT)

(74)	Representative: Petruzziello, Aldo, et al
	Dr. Ing. A. Racheli & C.srl. Viale San Michele del Carso, 4 I-20144 Milano I-20144 Milano (IT)

(54)	PROCESS AND PLANT FOR THE REDUCTION OF HEXAVALENT CHROMIUM CONTAINED IN THE RESIDUE RESULTING FROM THE PROCESSING OF CHROMIUM MINERALS