Patent Publication Number: US-4925543-A

Title: Insoluble anodes for extracting lead from the electrolyte in electrochemical processes for recovering the metals contained in spent accumulations

Description:
BACKGROUND OF THE INVENTION 
     This is a continuation in part of U.S. patent application Ser. No. 676,611, filed Dec. 3, 1984, now abandoned, which is a continuation of U.S. patent application Ser. No. 493,629, filed May 11, 1983, which is now abandoned. 
    
    
     This invention relates to a special constructional system for the insoluble graphite anodes used for extracting lead from the electrolyte in electrochemical processes for recovering the metal contained in spent accumulators. Said system enables several anodes to be supported and easily and simultaneously maneuvered without the danger of breakage during the immersion or extraction of the anodes into or from the tanks containing the electrolyte in which the lead has been dissolved. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     For a fuller understanding of the invention, reference is had to the following detailed description taken in connection with the accompanying drawings of preferred embodiments in which 
     FIG. 1 is a front view of the anode system according to the invention. 
     FIG. 2 is a top view of the anode system of the present invention. 
     FIG. 3 is a side view of the anode system of the present invention. 
     FIG. 4 is a detailed sectional view of the upper part of a suspended anode as shown in FIG. 3. 
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENT 
     The invention is described hereinafter with reference to the above said figures. By way of example, FIG. 1 shows three anodes 1, but these can be of any number. Each anode is in the form of a parallelepiped plate, which is rounded at its bottom end, and is provided at its top with one or more support strips of copper 2 (or other conducting material) of the form shown in FIGS. 3 and 4. Said support strips, which are bent over on to two major sides of the anode so as to leave an annular space above said anode, are clamped and kept adhering to the two faces of the anode by pairs of plates 3 fixed by bolts 4 and nuts 7, as shown in the detail of FIG. 4. 
     The anodes prepared in this manner are suspended from a current carrying steel tube 5 of square, circular or polygonal cross section clad with copper sheet 6, the tube being inserted into the annular spaces formed by the copper support strips 2. 
     The anode system formed in this manner can be easily maneuvered as required by using an overhead travelling crane or other lifting and transportation equipment, and the electrical connection to all the anodes is made by connecting the copper clad tube to the direct current power supply. 
     As shown in FIG. 4, the electrical contact between current carrying steel tube 5 and each copper support strip 2 takes place only along two points due to the inverted V-shape of copper support strip 2. This arrangement provides a space between each bottom lateral end of current carrying steel tube 5 and copper support strip 2 thereby allowing graphite anode 1 to swing from side-to-side due to oscillations in the electrolyte and, at the same time, preventing uninhibited movement thereof, which would result in damage to graphite anode 1 during operation. 
     In operation of the invention, anodes 1 are suspended in an electrolytic bath by connecting anodes 1 directly to inverted V-shaped copper support strips 2 which suspend from and contact steel tube 5 in only two points. When current is supplied to steel tube 5, anodes 1 swing due to oscillations of the electrolyte. As anodes 1 begin to swing, movement thereof is inhibited as support strips 2 contact the bottom lateral ends of steel tube 5. 
     In this manner, support strips 2 allow the use of brittle graphite anodes 1 despite the oscillations of the electrolyte, without causing any damage thereto. 
     Since the construction and the advantages of the present invention may be readily understood from the foregoing embodiment, further explanation is believed to be unnecessary. However, since numerous modifications will readily occur to those skilled in the art from the foregoing specification and accompanying drawings, it is not intended that the invention be limited to any particular embodiment disclosed herein, but variations, modifications and equivalents may be made therefrom which fall within the scope of the appended claims.