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Results of recent experimental studies and modern theoretical concepts are combined in this volume to provide a comprehensive analysis of sulfide mineral oxidation processes. Introductory chapters discuss the properties of sulfide minerals and various investigative techniques, followed by chapters on oxidation mechanisms and the behavior of minerals under these various oxidizing conditions. This book also demonstrates modern methods of physical-chemical modelling and the regulation and optimization of flotation processes.
The issue of iron-sulfide degradation in concrete aggregates has proven to be a major problem in concrete infrastructure, causing insufficient concrete durability and extensive structural damages which include expansion, cracking, and popouts. Over the years, there have been various reports of iron-sulfide minerals like pyrite and pyrrhotite causing oxidation reactions and leading to extensive residential concrete foundation damage in Connecticut and Quebec, Canada. In many of these cases, damages have been so serious to the structural integrity of the structures that immediate remediation has been required to repair the deterioration. The issue is not well documented despite reports of damage in the United States, Canada, and parts of Europe. Currently, there are limited existing standardized testing methods or mitigation strategies for the presence of iron-sulfide minerals in concrete aggregates because the mechanisms by which degradation occurs are not fully understood. The objective of this research is to experimentally measure the kinetics of iron-sulfide oxidation reactions in dissolution systems with oxidizing agents and analyze existing dissolution rate data available to assist in determining the factors that influence the deterioration of aggregates used in concrete infrastructure.
From a symposium at the 204th National Meeting of the American Chemical Society, Washington, D.C., August 1992. The research in this area is motivated by the locally severe environmental impacts and toxicity associated with the products of sulfide oxidation. Thirty- nine multidisciplinary papers address various aspects of sulfide oxidation: laboratory studies of kinetics; numerical modeling in tailings, waste rock, and in situ deposits; solubility and sorption control in formation of sulfide-oxidation products; transport products in surface waters, and in sediments; effects on ground-water geochemistry; processes in wetlands and the oceans; analytical methods; and remediation and prevention of environmental effects. Annotation copyright by Book News, Inc., Portland, OR