Navoi Mining and Metallurgical Combinat, Navoi, Uzbekistan:

V. K. Shteer, Director of Hydrometallurgical Works 2, info@ngmk.uz
S. K. Polvanov, Head of Sorption and Regeneration Shopfl oor of Hydrometallurgical Works 2
N. U. Ergashev, Head of Central Laboratory of Hydrometallurgical Works 2

The process flowsheet accepted at Hydrometallurgical Works 2 of the Navoi Mining and Metallurgical Combinat is originally meant for oxidized low-sulphurous ore from the Muruntau deposit. The sorption process stage includes preliminary cyanidation and sorption leaching of gold with resin. With an increase in production capacities, Hydrometallurgical Works 2 starts to intake ore from the Myutenbai deposit. This ore contains finely dispersed gold and sorption-active components. The buildup in the Myutenbai ore supply results in the loss of gold in sorption tailings, which affects performance of the Works. For this reason, it is highly important to improve the current processing technology and adopt it to the Myutenbai deposit ore. As a result of extensive laboratory and commercial tests, it was decided to abandon preliminary cyanidation and convert the resin feed circuit into the gold leaching process. The modifi cations of the sorption process flowsheet of the Works considerably increased gold recovery from rebellious ore of the Myutenbai deposit.

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