The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 24, 2001
Filed:
Nov. 30, 1999
Franco Mancia, Rome, IT;
Sandro Fortunati, Terni, IT;
Acciai Speciali Terni S.p.A., Terni, IT;
Abstract
A method for pickling products in a metal alloy containing iron, and products in titanium and alloys thereof, in the absence of nitric acid as an oxidizing agent, and for the recovery of the exhausted solutions, characterized in that the recovery of the exhausted solutions deriving from pickling comprises the following steps: sending of the pickling solution, both as catholyte and as anolyte, in an electro-chemical cell optionally of the membrane type to separate the Fe,(or Ti,) ions to be disposed of, from the Fe,(or of the Ti,and Ti,) ions to be recovered, obtained by reduction at the cathode of the Fe,ions which are in the catholyte to Fe,(or of the Ti,and Ti,ions to Ti,) and of oxidation at the anode Fe,(or Ti,) ions which are in the anolyte to Fe,(to Ti,and Ti,); treating the catholytic solution coming out of the cell and enriched in Fe,(or Ti,) ions as to allow the separation in two phases, a first phase containing the metal canions Fe,, Cr,, Ni,(or Ti,) to be disposed of and a second liquid phase deprived of said metal cations to be sent in the pickling bath; and sending the anolytic solution, coming out of the cell and enriched in Fe,ions (or Ti,or Ti,+), in the pickling bath. It is also the object of the present invention an apparatus thereof.