Abstract

Modern industry depends on a continuous supply of raw materials for the production of metals, fuels, ceramics, fertilizers, etc. This growing need for materials and energy is accompanied by the decreasing availability of mineral raw materials. Ore deposits, that is heterogeneous mixtures of solidified phases with some valuable minerals occurring in high amounts, are now having to be processed at lower grades. Thus, we are faced with limitations of the sources and supplies of mineral raw materials, and continued research is necessary if in the future we are to rely on low-grade raw materials.(1)

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