Possibilities of Complex Recycling of Wastes of the Energy Enterprises of Primorsky Krai

Abstract

The work presents the results of studying ash and slag disposal areas of Primorsky Krai energy enterprises-the objects with high concentrations of Au and Ag. The chemical and mineral contents of samples from the investigated ash and slag disposal areas have been determined. It is shown that the found particles of free gold and of other noble metals are mostly represented by fi ne and ultrafi ne sizes. It is also shown that morphology diversity is typical of gold microparticles. The patt erns of Au collection and allocation during the working process in ash and slag waste (ASW) were found. The possibility of using the materials obtained during the separation of ASW as materials for diff erent industries is shown. An appropriate, multistage way of complex ASW recycling has been developed. The possibility of creating a profi table plant for complex processing of ASW is shown. It is also shown that additional extraction of useful components from concentrates of gold and platinum group metals (PGM) can signifi cantly reduce the payback period of production on complex processing of ASW. KEY WORDS: technogenic deposits of gold, wastes of energy enterprises, ash and slag, complex recycling of mineral raw materials, fi ne-dispersed gold, iron-bearing concentrate, coal underburning

State-of-the-Art and Problems of Bioleaching of Metals from Ash-and-Slag Wastes

“…Parallel with this, in the world and domestic practice, there are numerous other promising (for realization) methods aimed at the processing of ASW, including the procedures of extraction of valuable metals. According to the data reported by Shamrai, et al [1], the amount of newly formed ASW in Russia can be estimated as about 90 mln. tons/yr, whereas the amount of already accumulated ASW exceeds 2 billion tons.…”