Improvement of Resource-Saving Technology for Aboveground Storage of Low-Grade Mineral Raw Materials
I. Yu. Rasskazov1, A. Yu. Cheban2, S. A. Shemyakin3, I. N. Pugachev1, T. G. Konareva2
1Khabarovsk Federal Research Center, Far Eastern Branch, Russian Academy of Sciences, Khabarovsk, Russia
2Institute of Mining, Far Eastern Branch, Russian Academy of Sciences, Khabarovsk, Russia
3Pacific National University, Khabarovsk, Russia
Keywords: Low-grade or stockpiles, large-batch sorting, ore mass segregation, enriched fine fractions, pay layer, heap leaching
Abstract
Opencast mining of nonferrous and precious metals involves extraction of large volumes of low-grade material which is stockpiled. The scientific literature review and the in-house research shows that fine fractions of low-grade ore are sometimes substantially enriched with useful component. The segregation effect observed in stockpiling using dump trucks ensures concentration of fine fractions at the top of a stockpile. An improved process flow diagram is proposed for the formation of the upper pay layer of a stockpile, that includes differentiation of the low-grade ore mass by the useful component content at an ore control station with the further dumping of two piles using dump trucks. The rational boundary for the low-grade ore separation by the valuable metal content is advised to determine from the condition of impossibility of a pay layer creation in one of the piles. After stockpiling, selective extraction of the pay layer is carried out, with sending the additionally produced mineral raw material to processing together with lean ore.
|
