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:
Jun. 09, 1992
Filed:
Feb. 22, 1991
Lise Castonguay, Jonquiere, CA;
Alcan International Limited, Montreal, CA;
Abstract
A cement for cathode collector bar/carbon block joints of electrolytic reduction cells as used, for example, for the production of aluminum. The cement comprises an aggregate of anthracite, graphite or mixtures of the two, and a binder comprising a curable water-soluble liquid polymeric resin and water. The fluidity of the cement is high enough that a joint may be formed by pouring the cement into a slot in the carbon block and positioning a bar on the top of the cement. The weight of the bar forces the cement up around the sides of the bar. The fluidity of the cement is made high enough by the use of an aggregate of -200 Tyler mesh, a resin content of 34-37% by weight of the cement and an amount of water in the range of 7-13% by weight of the cement. While the cement fluidity is suitably high as indicated above, it has a linear shrinkage of 4-5% when subjected to high temperature. These characteristics enable the cement to be used for the intended application without cracking the carbon blocks or permitting the formation of a gap between the bar and the block.