This article reviews the principal factors affecting the feasibility of recovering nonferrous metals from industrial wastes. Major emphasis is on available separation process technologies with potential for metal recovery and the economics of recycling. Consideration is also given to government regulations and the strategic character of certain metals that provide important incentives for recycling.

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The internal surfaces of rocks which are in contact with interstitial fluids are known to influence in some degree the recovery of hydrocarbons from pay zones. Despite the admitted importance of the influence of solid surfaces on hydrocarbon recovery, little information is available concerning the extent of surface of reservoir rocks. In this paper a description is given of the apparatus and procedure employed in the determination of the surface areas of sedimentary rocks, and values are reported for a ~ariety of sandstone and limestone cores. In addition, consideration is given to the Kozeny equation. which relates surface area to porosity and permeability. A comparison is made between the surface areas as calculated from this equation and the geometrical areas of a series of packs of spherical glass beads. Also, tor a group of sandstone cores, Kozeny areas are compared with surface areas as determined by the gas adsorption method employed in this investigation.

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