Process for producing a graphite anode

Claim 1

IN A PROCESS FOR PRODUCING A GRAPHITE ANODE IN AN ELECTROLYTIC CELL HAVING A MERCURY ELECTRODE FOR THE ELECTROLYSIS OF ALKALINE SALT SOLUTIONS THE STEPS COMPRISING IN COMBINATION, RESPECTIVELY, (A) FORMING A TAPERED RECESS IN SAID GRAPHITE ANODE, (B) HEATING THE RECESS TO ABOUT 150*C. TO 200*C. (C) UNDER PRESSURE DEPOSITION A CHLORINE RESISTAN MATERIAL IN THE RECESS, SAID MATERIAL BEING SELECTED FROM THE GROUP CONSISTING OF CHLORO-NAPHTHALENE, CHLOROPARAFFIN, CHLORINATED FISH OIL, CHLORINATED VEGETABLE OIL AND MISTURES THEREOF, (D) MAINTAINING THE SAID MATERIAL AND RECESS UNDER PRESSURE FOR ABOUT 30 TO 60 MINUTES WHEREBY THE MATERIAL PENETRATES INTO THE GRAPHITE ANODE, (E) FORCING A CONDUCTIVE CONNECTOR POLE COMPOSED OF A METAL HAVING A LOWER ELECTRICAL RESISTANCE THAN GRAPHITE AND HAVING A TAPERED END INTO THE RECESS WITH THE TAPERED END FITTING INTO THETAPERED RECESS IN THE GRAPHITE ANODE, ANY EXPOSED PART OF THE POLE BEING COATED WITH CHLORINE RESISTANT MATERIAL, AND (F) APPLYING A CHLORINE RESISTANT SEALING PROTECTIVE RING COMPOSED OF A MATERIAL SELECTED FROM THE CLASS CONSISTING OF IMPERVIOUS CARBON, GRAPHITE, HARD GUM, POLYESTER RESIN AND VINYL CHLORIDE, AND ADHESIVE AROUND THE CONNECTOR POLE AT THE INTERSECTION OF THE POLE AND GRAPHITE ANODE TO FORM A GRAPHITE ANODE WITH A FIRMLY BONDED CONNECTOR POLE.