Abstract
Grain-size class redistribution of non-ferrous, precious metals and iron in copper-nickel ores tailings from Norilsk industrial region was after artificial weathering investigated. Possible mechanisms of metal redistribution were suggested.
Highlights
The process of non-ferrous and precious metals extracting from the tails is an essential reserve for non-ferrous industry in old mining areas
There have been found the association of opened up dispersive particles of precious metals with secondary iron-oxide materials
Concentration of non-ferrous metals after weathering is situated in class –0.044 mm, in which oxide phase dominate according to X-ray phase analysis and microscopic observation
Summary
The process of non-ferrous and precious metals extracting from the tails is an essential reserve for non-ferrous industry in old mining areas. There are a great number of researches and practical works describing old tails as a potential source of metal. In this case, the major scientific and engineering problem is the optimization of reextraction methods. In some cases, when the increase of weathering is considerable, it is possible to extract metals-zinc, copper, nickel-by using hydrometallurgical methods. It can be done only if sulphide matrix is nearly completely decomposed and, soluble forms of non-ferrous metals and a favorable composition of barren rock generate
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