Pulsed Power Technologies for Processing of Mineral Complexes: Theory and Applications
This report reviews current research in high pulsed power technologies for processing of precious metals containing refractory ores and natural mineral aggregates. The aim of the paper is to show progress in the study of nanosecond processes involved in the disintegration and breaking-up of mineral complexes with fine disseminated precious metals. The paper presents results of theoretical and experimental studies of the mechanisms of the non-thermal action of high-power electromagnetic pulses with nanosecond leading edge, pulse duration, and high electric field strength on natural mineral media. Experimental data is presented to confirm the formation of breakdown channels and selective disintegration of mineral complexes as a result of pulse irradiation. This makes for efficient access of lixiviation solutions to precious metal particles and enhances precious metal recovery into lixivia during leaching. The paper shows the advantages of high-energy pulse treatment which provides a stable gain in valuable components recovery (3% ～80% gain for gold and 20% 50% for silver) and at the same time helps to reduce energy consumption and cost of products in the processing of resistant gold-containing ores and beneficiation products from Russian deposits. Its shown experimentally that the effect of highpower nanosecond pulses changes chemical surface composition and, respectively, technological properties (flotability) of the sulfide minerals, namely, pyrite and arsenopyrite, pyrrhotite and pentlandite. Morphology, dimensions (sizes), elementary composition of new micro-and nanoformations on mineral surface of sul-fides have been investigated using up-to-date methods of Scanning Electronic Microscopy, X-ray Spectral Microanalysis (SEM/EDX) and Scanning Probe Microscopy (SPM). It has been concluded that impulsive treatment influences oxidation and hydrophobicity of the minerals and, therefore, it allows for the control of the hydrophobic-hydrophilic mineral surface balance.
V.A.Chanturiya I.Zh.Bunin
Research Institute of Comprehensive Exploitation of Mineral Resources, Russian Academy of Sciences, Moscow, Russia
国际会议
厦门
英文
74-83
2011-08-10（万方平台首次上网日期，不代表论文的发表时间）