The operation and construction of dual ion exchange membrane fuel cells are described, and data are given for the operating characteristics of dual and single membrane cells. Membranes of varying diffusivity, thickness, and composition are compared. The strong effect of electrode construction is noted. Particular attention has been given to the changes that occur during long time operation, and the importance of water and electrolyte transfer is discussed.

A resin-in -pulp process vas developed using • series of rixed-sereen or Hinchester cells-Various lboratory and pilot plant models vere constructed and tested under smulated plant conditions. mhe fixed-sereen device proved very errective in the recovery of uranium and/or vanndium by a continuou~, resin-in-pulp process. CursvCasSECRET ACE-65 COrfuL. -AL TABIE OF CONTEITS 1. HISTORICAL BACKGROUND AND INTRODUCTION SECRET ACCO-65 Metallurgy-Raw Material* -5-TOPICAL tOtFORT ACCO-65

II. ORIGIM AMD DESCRIPTION OF SAMPPIGSThree samples of Temple Mountain ore were received. The first, in good condition, designated as Sarple 22-3, arrived October 31, 1952. It had been stated that this sample originated from a stockpile at the plant of the Vitro Chemical Co., Salt Lake City, Utah. The sample had a net weight of 418 pounds. The second semple, designated as Sample 22-4, also arrived in good condition on January 23, 1953 and was said to be from the high asphaltic stockpile at the Monticello, Utah plant. It weighed 440 pounds. The third sample, weighing 500 pounds, arrived in good condition on June 23, 1953. It had been taken from the south end of Stockpile 2b at the Monticello, Utah plant. Each ore sample was staged crushed through 1O mesh. After crushing the entire sample was split into 500-gram charges with a Jones riffle. A random charge was assayed chemically and spectrographically. The result of these analyses is given in Table I.

Laboratory investigation of a composited drill core sample from the North Jackpile ore body near Grsuits, New Mexico, revealed that the ore is readily amenable to acid leaching and ion exchange. Good settling rates were obtained on neutral and acid leached pulps. An oxidant was beneficial to leaching. Carbonate leaching was also effective either with a chemical oxidant or following a preliminary roast. Filtration of carbonate leached pulps was difficult. /->~Q^P-^ r? I7T *^ "'^ '^^ ^''''' ^^.siFlEP WIN-3 miJkSf^B Jt^fTN-. Metallurgy-Raw Materials

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