Entity

Time filter

Source Type

Navoiy, Uzbekistan

Mirsagatov S.A.,Academy of Sciences of Uzbekistan | Ataboev O.K.,Karakalpak State University | Zaveryukhin B.N.,Academy of Sciences of Uzbekistan | Nazarov Z.T.,Navoi State Mining Institute
Semiconductors | Year: 2014

A photosensitive structure with high room-temperature integrated sensitivity S int ≈ 700 A/lm (14500 A/W) is fabricated based on alloys of II-VI compounds n-CdSxTe1 - x and p-ZnyCd1 - yTe. Its photoelectric properties are studied at various illumination levels and bias voltages. It is found that diffusion and drift flows of nonequilibrium carriers are directed oppositely at low illumination levels and forward bias voltages. This effect leads to inversion of the photocurrent sign, which makes it possible to fabricate selective photodetectors with injection properties on its basis. © 2014 Pleiades Publishing, Ltd. Source


Ismagilov M.M.,Navoi Mining and Metallurgy Combine | Khuzhakulov N.B.,Navoi State Mining Institute | Gafurov K.,Navoi Mining and Metallurgy Combine
Tsvetnye Metally | Year: 2016

This paper shows the regularities of spatial-volumetric distribution of gold in large-scale tailing dump. Gold distribution in the stale tailings of Hydrometallurgical Plant No. 3 (Navoi Mining & Metallurgy Combine) was investigated. Localizations of different forms of gold were installed in the tailing dump. Methodology for the study of technogenic raw materials of hydrometallurgical plants was developed and considers the following methods: sampling; elemental and mineralogical analysis of stale hydrometallurgical processing tailings; geotechnological investigations; assessment of practicability and profitability of applied gold leaching methods. Considering that gold has almost equal quantities and six different forms, application of traditional concentrating methods (gravitation and flotation) does not give the possibility of achieving high gold extraction level. The autoclaving method is not profitable due to the high cost price. Before the choice of gold extraction method it's necessary to foresee the cyanidable forms of gold in technogenic materials by the influence of alternative destruction methods. In this case biological methods of rock destruction directly in the center of location (with the use of natural bacteria actively functioning in alkaline medium) have a substantial advantage. Different possible versions of technogenic materials processing, their advantages and disadvantages were studied. This scientific work was carried out under the guidance of G. S. Sattarov, professor of a Chair of Metallurgy Navoi State Mining Institute. Source


Muzafarov A.M.,Navoi Mining and Metallurgy Combine | Oslopovskiy S.A.,Navoi Mining and Metallurgy Combine | Sattarov G.S.,Navoi State Mining Institute
Tsvetnye Metally | Year: 2016

This article shows the results of radiometric investigations of technogenic objects: patterns of spatial distribution of equivalent dose rate of gamma radiation; geochemical behavior of radionuclides in the joint storage of different composition wastes; evaluation of radiation contribution of technogenic objects in environment. Radiometric method is one of operational nuclear-physical methods of examination of technogenic objects. During the radiometric studies on technogenic objects to identify the entering factors and study the geochemical behavior of radionuclides in groundwater, this method shows the possibility of developing methods to reduce the radiation exposure of technogenic objects of mining and metallurgical enterprises on environment. The object of this research was the development of guidelines for radiometric survey, definition of equivalent dose rate of gamma radiation (EDR) of technogenic objects and radiometric determination of radionuclide concentrations and their geochemical behavior in underground water samples; generalization of research results on the disclosure of main factors of radioisotope dissolution mechanism; development of measures to reduce the radiation factor of technogenic objects of mining and metallurgical enterprises on environment. Currently, this research continues to systematize the previously obtained data (over 20 years), for more reliable mechanism for understanding the geochemical behavior of radionuclides in technogenic waste disposal facilities of different composition and radionuclide solubility under the influence of the different composition of the liquid phases. Identification of the main factors of solubility of radionuclides in water samples makes it possible to quickly solve the questions of estimation of the impact of technogenic object on environment. On the basis of radiometric investigations of technogenic objects, there were identified the patterns of spatial distribution of gamma radiation EDR and radionuclide concentration in water samples. These results show that in both cases there is no excess performance over the regulated values. Source


Muzafarov A.M.,Navoi Mining and Metallurgy Combine | Vasilenok O.P.,Navoi Mining and Metallurgy Combine | Narbadalov Sh.I.,Navoi Mining and Metallurgy Combine | Sattarov G.S.,Navoi State Mining Institute
Tsvetnye Metally | Year: 2016

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. Source


Mirsagatov Sh.A.,Academy of Sciences of Uzbekistan | Sapaev I.B.,Academy of Sciences of Uzbekistan | Nazarov Zh.T.,Navoi State Mining Institute
Inorganic Materials | Year: 2015

We have studied the effect of ultrasonic processing on the electrical and photoelectric properties of a p-Si/n-CdS/n+-CdS injection photodiode. The results demonstrate that ultrasonic processing of such photodiodes reduces the density of surface states at the interface of their heterojunction as a result of defect annealing. This increases the spectral and integrated sensitivities of the photodiodes. © Pleiades Publishing, Ltd., 2015. © Sh.A. Mirsagatov, I.B. Sapaev, Zh.T. Nazarov, 2015. Source

Discover hidden collaborations