Arrangement for closing the top of a Soderberg anode in an electrolytic cell or production of aluminum

Arrangement for closing the top of a Soderberganode used in connection with electrolytic production of aluminium which anode is equipped with an anode casing and vertical contact bolts for holding and for conducting operation current to the anode and where the top of the anode casing is closed by means of at least one cover having openings for the contact bolts and at least one opening for charging anode paste and at least one off-gas opening, characterized in that the cover comprises a central cover having openings for the contact bolts said openings having a diameter exceeding the diameter of the contact bolts and where the annular opening between each of the contact bolts and the corresponding openings in the central cover are sealed by means of sealing elements which are gas tight sealed against each of the contact bolts and which are freely floating on the central cover, and that side covers are arranged between the central cover and the sidewalls of the anode casing, said side covers being rotatably arranged.