Contribuicao para o Estudo da Lixiviacao de Sulfuretos Complexos

The thesis is concerned with the development of the hydrometallurgical route of complex sulphides processing. A general view of the perspective valuation of the complex sulphides as a raw-material of non-ferrous metals, the existing mineral and metallurgical processing routes, development and/or implementation of hydrometallurgical processes, namely chloride leaching, is given. A survey of the mineral and hydrometallurgical operations for obtaining and treating the concentrate being studied, some characterization techniques applied to solid products and/or liquid and methodologies used in design experiments, analysis and interpretation of results are presented. Methodologies developed for mineralogical compared semiquantitative analysis, for systematization of calculations of the leaching agents and also for leaching tests with sequential liquor samples are explained. The experimental work covers leaching with agitation tests, collection of representative samples in the several stages of processing and respective characterization. Temperature effects and reaction time, the estimation and eventual extrapolation of empirical mathematical models for optimization of the leaching agents are included in the analysis and interpretation of results. In addition, a graphic interconnection of the factorial experiments is analyzedAvailable from Fundacao para a Ciencia e a Tecnologia, Servico de Informacao e Documentacao, Av. D. Carlos I, 126, 1200 Lisboa / FCT - Fundação para o Ciência e a TecnologiaSIGLEPTPortuga