Navoi Mining & Metallurgy Combine, Navoi, Uzbekistan:

Muzafarov A. M., Deputy Director of Scientific Research, Chief Engineer of Central Scientific-Research Laboratory, e-mail: AM.Muzafarov@ngmk.uz
O. P. Vasilenok, Head of Central Scientific-Research Laboratory
Sh. I. Narbadalov, Chief Engineer (Northern Mining Department, Hydrometal lurgical Plant No. 3)

Navoi State Mining Institute, Navoi, Uzbekistan:
G. S. Sattarov, Professor of a Chair of Metallurgy

This article considers the possibility of the off-spec water application in hydrometallurgical production for the increasing of ore processing volumes. Most hydrometallurgical plants apply industrial waste waters for the circulating water supply. In such case, Hydrometallurgical Plant No. 3 (Northern Mining Department, Navoi Mining & Metallurgy Combine) uses only a part of industrial waste waters because of the high content of salts. Physical and chemical properties of various waters of Uchkuduk region were completely investigated for the water supply of Hydrometallurgical Plant No. 3. Simultaneous analysis of the changes of technological indicators of processing of ore mixture of gold-bearing deposits Daugyztau and Kokpatas was carried out during the use of “Beshbulak” intake water mixture and sewage-cleaning facilities water with technical water of the Plant No. 3 with the ratio 30:70 and 50:50. Water samples were taken at all main units of concentration processes (grinding, flotation concentration, flotation tailing thickening), sorption cyanidation of flotation tailings and bacterial leaching on the basis of BIOX technology. In comparison with the technical water of the Plant No. 3, the technical water of the Plant No. 1 has the increased content of sulfates, nitrates, magnesium, hardness salts et al. Additional water supply of technological processes of the Plant No. 3 (flotation, thickening and cyanidation of flotation tailings) may use the technical water mixture with “Beshbulak” intake water and mine outflow with the ratio of 1:1. Technical water of the Plant No. 1 should be used in laboratory and pilot set testings for the modeling of the processes of the Plant No. 3 (excluding the BIOX process), because low content of Cl^– in technical water of the Plant No. 1 leads to nonidential behavior and development of microorganisms. In connection with this, only technical water of the Plant No. 3 should be used for the modeling of the BIOX process of the Plant No. 3. There were found the criteria of water quality for regular technological operations. Certain conditions were recommended for their practical application.

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