Non-traditional High-energy Methods for Disintegration and Breaking-up of Fine-disseminated Mineral Complexes from Refractory Precious Metal Ores
There is an obvious disproportion in Russia gold-mining industry between the structure of gold reserves and the gold-mining techniques. The bulk of gold (over 70%) is extracted from alluvial deposit, 20%～25% from bedrock occurrences and 5%～7% from complex copper-zinc and polymetallic ores. The proved gold-bearing reserves are distributed as follows:alluvial-19%, bedrock -80%, the latter being sufficient to supply gold at the current production level for 100 years to come.In Russia, like elsewhere in the world, development of primary gold deposits is considered a first-priority line of development for gold-mining industry.Most of the gold-containing ores characteristic of Russian gold deposits are resistant ores with gold content varying between 3 ppm and 5 ppm usually showing quite low gold and silver recovery by cyanidation. Processing resistance of gold-containing mineral complexes is related to the presence of gold particles of submicrometric (＜1.0 μm) and nanometric (10～100 nm) size, mostly associated with pyrite and arsenopyrite. Therefore switching over to processing bedrock entails a number of technological problems that stem from chemical and physical resistivity of ores. The chemical resistivity can be overcome through flotation, oxidation roasting, autoclave leaching (biohydro-metallurgical oxidation), etc. The physical resistivity can be dealt with by resorting to traditional power-intensive methods,e.g, grinding to a -40μm size, thermal treatments of sulphide concentrates and non-traditional high-energy methods of liberating the sulphides by means of power attack, e.g.electro-chemical oxidation, exposure to electron beam radiation and other methods.The modem non-traditional processes for treatment of rebellious noble metal-bearing ore, aimed at improving disintegration efficiency for finely dispersed mineral complexes are analysed. Advantages and perspectives of a new high-efficient, energy-saving and ecologically safe process of the nanosecond high-power electromagnetic pulses (HPEMP) effect are proved. The said process provides a stable increase in the valuable component recovery at lower energy consumption and production costs of the finite product at the stage of dressing rebellious gold-bearing ores and concentrated products. The experimental data prove high efficiency of the preliminary impulse treatment,thus, the increase in the gold recovery at the cyanidation stage amounted to 4%～12% from rebellious ores, 10%～30% from gravity concentrates, 5%～45% from flotation concentrates, 30%～80%from oil flotation tailings.
Refractory precious metal ores and beneficiation products Disintegration High-power nanosecond electromagnetic pulses
V. A. Chanturiya I. Zh. Bunin
Research Institute of Comprehensive Exploitation of Mineral Resources,Russian Academy of Sciences, Moscow, Russia
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
262-273
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）