By Thomas B. Drew (ed.), Giles R. Cokelet (ed.), John W. Hoopes (ed.), Theodore Vermeulen (ed.)

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Panlasigui and Wheelock (P2) investigated the rate of dissolution of copper by oxygen and by the cupric ammine complex as a function of oxygen, copper, ammonia, and ammonium carbonate concentrations, and stirring velocity using the rotating disk method. The dissolution rate waa found to be first order with respect to oxygen and the cupric ammine complex and is limited by the transport of oxygen and/or of the cupric amine complex form the bulk of the solution to the surface of the metal. 93 X lW7cm2/sec.

The important factors and variables that could be used in the improsement of leaching operations and the understanding of some of the mechanisms taking place during the process were covered both from actual operating experience and relevant simulating laboratory experiments. The results from the simulating laboratory experiments effectively demonstrated the influence of chemical, physical, 32 RENATO G . BAUTISTA and biological factors on the actual processes taking place in the dumps. By no means were all the problems solved, but sufficient information on the mechanisms and controlling variables in the various stages of leaching has been developed to make possible the initiation of mathematical modeling of the process.

The us? of ethylene glycol as the solvent for leaching high-grade scheelite concentrates to produce high-purity tungstic acid from which high-purity tungsten oxide is obtained has been described by Forward and Vizsolyi (F13). The process consists of treating the CaW04 with sulfuric acid a t 100°C to produce a solid mixture of tungstic acid (HzW04) and CaS04. %HzO,togcther with SiOz and other insoluble impurities. This solid mixture is reacted with recycled ethylene glycol solution containing ethylene chlorohydrin a t 100-120°C.

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