BIO-GEOTECHNOLOGY FOR GOLD-BEARING ORE

The information on biological leaching of gold-bearing ore is reviewed. The mechanisms of biological leaching are analyzed. Amongst the methods of interest is leaching of sandy–clayey finely dispersed gold ore (particles under 5 μ) by hydrolysate solutions containing 3 g/l of aminoacids and 10 g/l of potassium permanganate, which has allowed gold recovery of 72.7%. For the purposes of gold ore processing, alongside with the method of leaching, it would be efficient to utilize capacity of some microorganisms to precipitate gold from solutions. Currently, laboratory and full-scale researches are known to be carried out to precipitate gold from solutions by fungi, namely, mycelial fungi Aspergillusniger, Aspergillusoryzae and Penicilliumexpansium. The highest effect is achieved in gold leaching by mycelial fungi Aspergillusniger and Aspergillus oryzae. The biomass of fungi for gold leaching mainly consists of aminoacids and albumens, i.e. nitrogen compounds. In gold precipitation from chloride solutions, the best yield belongs to protamine and globulin. Another precipitator of noble metals can be dried out fungal mass Aspainiger which is citric acid production waste. A binding matter in granulation of fungal biomass is rejects of sugar beet processing—molasses. Quality of noble metal precipitation is evaluated based on the fungal mass feed: metal recovery grows in proportion with an increase in the latter. For example, at the feed of fungal mass of 40 g/l, precipitation for 4 days yields 100% of gold, 96% of silver, 84% of platinum and 92% of palladium. Mycelial fungi are equal to active carbon with respect to sorption capacity whereas they exceed coal by 10–12 times and are equal to ion-exchange resins in terms of capacity to absorb colloid gold. The static gold absorbability of mycelial fungus biomass makes round 50 mg. Recently, methods of combination electrophysical and biological treatment of gold-bearing raw materials enjoy increasingly wider application. It is noticed that the described bio-technology can be successfully adapted for processing of clinker at Electrozinc Plant.

Keywords

Bacterial leaching, gold-bearing ore, microorganism, combination electrophysical and biological leaching.

Issue number: 6
Year: 2018
ISBN:
UDK: 622.755
DOI: 10.25018/0236-1493-2018-6-0-126-133
Authors: Alborov I. D., Gegueva M. M., Kasumov Yu. N., Kozyrev E. N., Sozaev V. A.

About authors: Alborov I.D., Doctor of Technical Sciences, Professor, Head of Chair, e-mail: kafedra-eko@skgmi-gtu.ru, Gegueva M.M., Laboratory Assistant, e-mail: gegyeva@mail.ru, Kasumov Yu.N., Candidate of Physical and Mathematical Sciences, Assistant Professor, e-mail: kasumov60@mail.ru, Kozyrev E.N., Doctor of Technical Sciences, Professor, Head of Chair, e-mail: kozyrev@skgmi-gtu.ru, Sozaev V.A., Doctor of Physical and Mathematical Sciences, Head of Chair, e-mail: sozaeff@mail.ru, North Caucasus Mining-and-Metallurgy Institute (State Technological University), 362021, Vladikavkaz, Republic of North Ossetia-Alania, Russia.

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