Papers by Aibek Kh
Mineralogical, granulometric, and phase compositions of the copper sulfide concentrate of the Erd... more Mineralogical, granulometric, and phase compositions of the copper sulfide concentrate of the Erdenet deposit (Mongolia) have been studied. It is shown that the concentrate has a high chemical stability against the interaction with sulfuric solutions after both a preliminary oxidizing roasting and mechanoactivation in a planetary mill (in dry and wet regimes of milling).
MDPI Minerals, 2017
Selenium pollution has been a topic of extensive research dating back further than the last decad... more Selenium pollution has been a topic of extensive research dating back further than the last decade and has attracted significant attention from several environmental and regulatory agencies in order to monitor and control its discharge from myriad industrial sources. The mining industry is a prime contributor of hazardous selenium release in the aquatic systems and is responsible for both acute and chronic impacts on living organisms. Herein we provide an overview of selenium contamination issues, with a specific focus on selenium release from mining industries, including a discussion of various technologies commonly employed to treat selenium-impacted waters from mining discharge. Different cases pertaining to selenium release from Alaskan mines (during years 2000–2015) are also presented, along with measures taken to mitigate high concentration releases. For continued resource exploration and economic development activities, as well as environmental preservation, it is important to fundamentally understand such emerging and pressing issues as selenium contamination and investigate efficient technological approaches to counter these challenges.
Non-Ferrous Metals, 2010
Method of processing of sulphide copper raw materials by roasting with NaCl (450 0C) and KCl (700... more Method of processing of sulphide copper raw materials by roasting with NaCl (450 0C) and KCl (700 0C) and following leaching of cake are studied. The research was done with two different concentrates – Erdenet (Mongolia) and Udokan (Russia) deposits. In this processing the gas emission of sulphuruos gases in atmosphere is completely excluded. Approaches of different roasting parameters of concentrates and leaching of cakes with the production of copper sulphate, potassium and sodium salts and ferrous case as end product are developed
The abiotic leaching behavior of a chalcopyrite ore, from Asarco's Ray-Mine, was conducted in sha... more The abiotic leaching behavior of a chalcopyrite ore, from Asarco's Ray-Mine, was conducted in shake flasks and miniature columns at elevated temperatures. The shake flask tests, with an ore particle size of 1.18mm-2.38mm, found the highest Cu extraction was obtained using 1M NaCl in a 9.8g/L sulphuric acid solution at 60°C, with 69% Cu extracted in 16 days. The next highest extraction, 59% Cu extracted in 16 days, was achieved by adding fine pyrite at a 4:1wt ratio with the chalcopyrite content, in a 9.8g/L sulphuric acid solution at 60°C. Flask tests using other lixiviants and additions found copper extractions in the range of 30-40% Cu after 16 days. In the mini-column tests, the rates of copper extraction were similar for all test conditions. The rate of Cu extraction, even with a small particle size of 1.18mm-2.38mm and an elevated temperature of 50°C, was slow for all test conditions with an average rate of ~0.15% Cu per day.
The abiotic leaching behavior of a chalcopyrite ore, from Asarco's Ray-Mine, was conducted in sha... more The abiotic leaching behavior of a chalcopyrite ore, from Asarco's Ray-Mine, was conducted in shake flasks and miniature columns at elevated temperatures. The shake flask tests, with an ore particle size of 1.18mm-2.38mm, found the highest Cu extraction was obtained using 1M NaCl in a 9.8g/L sulphuric acid solution at 60°C, with 69% Cu extracted in 16 days. The next highest extraction, 59% Cu extracted in 16 days, was achieved by adding fine pyrite at a 4:1wt ratio with the chalcopyrite content, in a 9.8g/L sulphuric acid solution at 60°C. Flask tests using other lixiviants and additions found copper extractions in the range of 30-40% Cu after 16 days. In the mini-column tests, the rates of copper extraction were similar for all test conditions. The rate of Cu extraction, even with a small particle size of 1.18mm-2.38mm and an elevated temperature of 50°C, was slow for all test conditions with an average rate of ~0.15% Cu per day.
Conference Presentations by Aibek Kh
Currently in the Joint venture Mongolian-Russian mining company Erdenet (Russian government owns ... more Currently in the Joint venture Mongolian-Russian mining company Erdenet (Russian government owns 49%), the processing has 15 % copper and 35-40% molybdenum in middlings, which are not economically efficient to process to final molybdenum concentrates. The Department of Non-Ferrous Metals and the Department of Rare Earth Elements and Powder Metallurgy proposed a technology of complex processing of those materials. This technology was tested in laboratory. In this technology, the current material is roasted in low temperatures (up to 600 ¬0C) with following selective sulfuric acid leaching of copper and ammonia leaching of molybdenum. Also was tested method, where molybdenum is leached first and then copper. It has shown that in the first series of tests, with roasting of materials for 3 hours in 600 C, leaching copper with concentrated sulfuric acid in ambient temperature, and molybdenum with 10% ammonia acid with heating, the recovery of copper was above 90% and molybdenum 95%. Research on optimization of technological parameters will be continued.
Thesis Chapters by Aibek Kh
Processing of copper materials
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Papers by Aibek Kh
Conference Presentations by Aibek Kh
Thesis Chapters by Aibek Kh