Gravity Concentration, Volume II

Dear Colleagues,

Many of the resources that humans extract from nature are of mineral origin. However, rarely are these nonrenewable resources in a position to be used directly. Thus, minerals need to undergo some beneficiation. The choice of the concentration process to be used in a mineral depends on the physical and chemical characteristics of the constituents to be separated. Gravity concentration can be defined as the process by which particles of different sizes, shapes, and densities are separated from each other by the force of gravity or centrifugal force. The method is one of the oldest in mineral treatment. Its most primitive separation processes, which probably date back as far as 4000 BC, appeared as soon as selective mining and handpicking were no longer enough to produce the desired concentration quality. Gravity concentration is at present the main concentration process in the mineral industry in terms of tons processed. The size that can be processed ranges from very coarse materials, coarser than 100 mm, concentrated through heavy media vessels or ROM jigs, to very fine particles, about 10 microns, concentrated through centrifugal processes. This Special Edition aims to bring together scientific articles in all areas of gravity concentration, from fundamental stratification theory to circuits plant operations, through concentration equipment, control, simulation, and optimization of gravity concentrators.

Prof. Dr. Carlos Hoffmann Sampaio
Prof. Dr. Weslei Monteiro Ambros
Guest Editors

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• Gravity Concentration in Minerals (8 articles)