E.i. Dupont De Nemours and Company

Everett Ira Baucom

James T Keating

James M Batman

An ion exchange membrane reinforced with leno weave yarn system having sacrificial fibers paired with resistant fibers in the warp of the fabric, and an electrolysis process using the membrane are disclosed.

Membrane reinforced with modified leno weave fabric

A process for the recovery of metal values, principally zinc and copper, from an aqueous acidic purge stream in a hydrometallurgical process by contacting the stream containing the iron, copper and zinc sulfates, along with trace amounts of other metallic sulfates with calcium oxide to bring the pH in the range 3.0-4.0, thence with sufficient ammonia to form the soluble tetrammine sulfates of copper and zinc, then separating the copper from the zinc, e.g. by hydroxy oxime-solvent extraction and thereafter recovering the zinc as zinc oxide by converting the zinc tetrammine sulfate to the hydroxide and removing ammonia from the complex.

Zinc recovery from acidic aqueous streams

A process for the recovery of metal values, principally molybdenum, by contacting an acidic aqueous solution containing iron, copper and sulfate ions in addition to the metal values to be recovered with an alkyl amine dissolved in a water-insoluble liquid hydrocarbon and subsequently contacting the resultant organic phase in multiple stages at controlled pH.

Growing community of inventors

Kennett Square, PA, United States of America

Everett Ira Baucom