The recovery of gold from refractory ores and concentrates is a significant problem in the modern gold processing industry. The use of bacterial oxidation technology at the Navoi Mining and Metallurgical Combine (Uzbekistan) made it possible to increase the share of recoverable gold during the processing of refractory ores from the Kokpatas and Daugyztau deposits. However, during the operation of the biological installation, a problem arose of abundant foaming in bacterial oxidation reactors. This article is devoted to the issue of foaming during biooxidation and its negative impact on the oxidation process. Methods of combating foaming and the choice of the optimal solution, providing for the processing of bio-oxidation foam in a separate cycle, have been analyzed.

Among the methods of preliminary opening of refractory gold before sorption cyanidation, the technology of bacterial oxidation is widely used today. Although this technology has many advantages, the specialists of most enterprises around the world using this technology are faced with the problem of foaming in bio-oxidation reactors. This article discusses the possibility of using oxidative roasting in the processing of the foam product of the process of bacterial oxidation of flotation concentrate in a separate cycle.