method for chromgewinnung from chromium containing exothermic material

摘要

A cationic permselective membrane comprises discrete particles of an insoluble, infusible cation-exchange resin dispersed intimately and uniformly throughout a matrix comprising at least one solid perhalogenohydrocarbon polymer obtained by polymerizing a perfluorochloro-olefin such as trifluorochloroethylene and/or a perfluoro-olefin such as tetrafluoroethylene. The matrix may also contain polyethylene, polyvinyl chloride or a vinyl chloride-vinylidene chloride copolymer. The cation-exchange resin may be of the sulphonic or carboxylic type described in Specification 719,315.