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Leaching of chalcopyrite concentrate in hydrogen peroxide solution

Agacayak T., Aras A., Aydogan S., Erdemoglu M.

Physicochemical Problems of Mineral Processing

2014

Vol. 50, iss. 2

657--666

The leaching conditions of chalcopyrite (CuFeS2) concentrate in a hydrogen peroxide medium were investigated by studying the effects of its leaching parameters, such as stirring speed, temperature, hydrogen peroxide concentration and the particle size of the concentrate on Cu extraction. It was found that stirring speed has no effect on the leaching. Copper extraction from chalcopyrite is directly proportional to hydrogen peroxide concentration, but the extraction decreases at temperatures above 60°C. The maximum copper extraction was obtained with the following conditions without stirring: 240 min of leaching time, 3.0 M hydrogen peroxide concentration, 40°C leaching temperature and 53-75 m particle size fraction.

Bacterial Leaching as a pre-treatment step for gold recovery from refractory ores.

Ozkan A., Aydogan S., Akdemir U.

Fizykochemiczne Problemy Mineralurgii

1998

Vol. 32

173-181

In this article, pre-treatment such as bio-leaching before cyanidation is discussed as an alternative technique to treat refractory gold ores containing pyrite and arsenopyrite. There are two methods of bacterial leaching, namely stirred reactor bi-leaching and bio-heap leach processes. The examples of industrial applications and economics of bacterial leaching are give in detail.

Omówiono bioługowanie jako alternatywna technikę przerobu trudno ługowalnych rud złota zawierających obok złota piryt i arsenopiryt. Istnieją dwie metody ługowania na hałdzie. Szczegółowe opisano przykłady przemysłowego zastosowania ługowania bakteryjnego i jego ekonomikę.