Chapter 3 - Oxidative Dissolution of Metals and Metal Oxides in a Liquid Phase

Abstract

This chapter focuses on the oxidative dissolution of metals and metal oxides in a liquid phase. Studies of the theory of solid-liquid interaction are becoming more essential in view of the necessity to increase the productivity of technological processes in the chemical, hydrometallurgical, chemopharmaceutical and other branches of industry. Several methods are employed to study solid dissolution kinetics. The most applicable are the two techniques that involve powder samples or samples of some definite shape—such as pressed pellets, plates, cylinders or disks—with a known surface. The methods based on the use of a compact sample, however, do not produce unambiguous results to characterize the kinetics of a real hydrometallurgy process. The methods using powder samples reveal more exactly the character of hydrometallurgy process kinetics. The chapter discusses the kinetics of dissolution of metal powders and metal oxides and describes the processes of direct synthesis using halogenated hydrocarbons, direct synthesis with solutions of ammonium salts, and direct synthesis in solutions of proton-donor reagents. The chapter also discusses about the interaction of metals with Quinones and Phthalocyanine precursors..