Abstract: A process for applying a graphite coating to the interior of a prismatic battery can by filling the can with a slurry containing graphite particles, immediately removing the slurry with an aspirating nozzle and then drying the residue left in the battery can to leave a thin film of graphite on the interior of the can. In a continuous process, fill nozzles and aspirating nozzles are moved in set into and out of the cans simultaneously, while moving the nozzles along with the cans through a fill and aspirate station on a conveyor. From there the cans travel through a drying oven where the residue remaining in the cans is dried to leave a thin uniform graphite film inside a prismatic can.

Abstract: A method for cleaning a vessel by dissolving iron oxide present in the vessel includes introducing a saline solution into the vessel, the saline solution being formed of an acid acting as a complexing agent, of an alkalizing agent and of a reducing agent, the saline solution acting as an alkaline reducer; retaining the saline solution in the vessel for a given period of time at a temperature above 140.degree. C. and below the decomposition temperature of the anionic part of the saline solution for forming an iron complex; and subsequently removing the dissolved iron complex by emptying the vessel.

Abstract: A method for cleaning a vessel by dissolving iron oxide present in the vessel includes introducing a saline solution into the vessel, the saline solution being formed of an acid acting as a complexing agent, of an alkalizing agent and of a reducing agent, the saline solution acting as an alkaline reducer; retaining the saline solution in the vessel for a given period of time at a temperature above 140.degree. C. and below the decomposition temperature of the anionic part of the saline solution for forming an iron complex; and subsequently removing the dissolved iron complex by emptying the vessel.