Research and technology

MINING AND METALLURGICAL INDUSTRY OF THE NAVOI REGION

In Uzbekistan, a significant amount of work has been carried out to increase the effectiveness of research activities, strengthening the role of science in social economic development, and democratic renewal of the country. The Government of Uzbekistan pays great attention to speeding up innovation as the main engine of sustainable development of the country. New institutions and systems of interrelations and innovations are gradually being created, an innovative infrastructure is being formed.

The modern market is going through a time of obvious shortage of mineral raw materials. Reserves of deposits with a high initial content and easily enriched ores are now depleted, and the ore that is difficult to extract and difficult to process is involved in the development. High metal prices in the world market create a favorable condition for the development of deposits with a low content of useful components in difficult mining and natural climatic conditions, as well as involving in the processing of mineral resources of techno-genic origin.

When we speak about Kyzylkum region of Navoi viloyat, we imagine the fruitful valley rich in gold, silver, marble, phosphorite, uranium, and quarts , limestone, almost the whole table of Mendeleev. 

Mining, metallurgy, chemical, and energy industries are being well developed in Navoi region. Among them Navoi State Mining and Metallurgical Combinat takes a significant place.

Navoi Mining and Metallurgical Combinat is the leading enterprise for the extraction and production of gold, uranium, phosphorites. Over 65,000 specialists of various professions work on this industrial giant. The government pays much attention to modernizing of production, re-equipping of technical and technological processes, and improving the export opportunities of the plant. Navoi Machine-Building Plant as part of the Navoi Mining and Metallurgical Combinat is the basic structure for the repair of mining equipment and equipment for the mining industry. Besides, it produces consumer goods and technical equipment.

At the Muruntau deposit, which is located in the center of the Kyzylkum region, an open-cast mining method is being applied, and the amount of mining is increasing and the depth of the quarry is increasing. The period of mining of the Muruntau quarry since 1991 was marked by the use of a combined automobile-conveyor type of transport. The capacity of excavators at quarries runs from 8 to 15 m3; Dump trucks of BelAZ-549 and BelAZ-7519 types with load-carrying capacity of 75 and 130 tons, dump-trucks of type SAT-758B and R-170 with carrying capacity of 136 and 170 tons, respectively; The park of road machines and heavy equipment was replenished with new more powerful front loaders such as CAT-992C, graders SAT-16G and bulldozers SAT-10N. A shop for repairing excavators and drilling rigs has been built; Complex laboratory of gamma-activation analysis. Since 1996, hydraulic and electrohydraulic excavators of the SAT-5230, EX-3500, EX-3600, RH-170, RH-200 type with bucket capacity from 15 to 26 m3 have been operated, heavy-duty dump trucks of the type SAT-789S, BelAZ-7513 BelAZ-7555 and BELAZ-75131. The first place in terms of the number of dump trucks used by the plant (214 units) is BelAZ (Belorussia), the second place in the number of operating equipment (65 units) is occupied by Caterpillar (USA).

Improvement of technological schemes for the formation of dumps has made it possible not to reduce the height of automobile dumps in areas with a lower bearing capacity of the base, increasing the efficiency of dumping works by 15-30%. The safety of the "blade-base" system in conveyor transport on the basis of a variable bearing capacity is provided by forming a tier of a heap up to 120 m in height by narrow gaps of 20-30 m and realized by the method of dumping the blade with fan strikes. As a result, the height of the conveyor dump has been increased from 60 to 90 m. The technology of multi-tiered external and internal dumping with controlled rock movement has been introduced.

Enhancing of open and underground mining works

  • Introduction of modern methods of minerals extraction with full, complex and economically rational aim taking into account environmental protection and safety of work;
  • Development and sustainability of the method of explosive destruction of an array of different rock strengths;
  • Ensuring the stability of the sides of deep quarries in the formation of high ledges;
  • Intensification of technological processes in the development of mineral deposits by the open method;
  • Introduction of technology of selective extraction and storage of ores by technological grades;
  • Rationalization and enhancement of the efficiency of ore mining technology, ore preparation and ore dressing.
  • Modernization of mining equipment;
  • Introduction of resource and energy-saving, as well as resource-restoring technologies, application of alternative energy sources;
  • Improvement the technology of mining low-capacity complex-structure deposits by underground method.
  • Management of rock pressure in the deep horizons of the mines of the Kyzylkum region
  • Study of reduction in losses and dilution during underground mining of low-power complex-structural deposits;
  • Feasibility study (Feasibility study) of the conditions and recalculation of reserves of the Muruntau deposit together with the nearby Myutenbay deposit using modern computer technologies indicate the possibility of increasing the extraction of additional gold reserves by 35.8% due to the development of deposits by one integrated quarry. The technology of conducting mining works on steep sides with angles of inclination up to 40-450 and technological schemes of equipment operation in cramped conditions and ledges with a height of 15-20 m is introduced.
  • For the development of the instrumental reserves that do not fall into the contours of the quarry, the open-underground method of development is promising. To this end, pre-design studies have been carried out, when out-of-the-way underground workings can be carried out from the developed quarry space, allowing to increase gold reserves by 36.3%, then a transition to an underground mining method can be carried out.
  • Intensive development of mining operations in a quarry requires the constant solution of complex technological problems, the performance of research and development, the involvement of specialists in mathematical modeling of mining processes, the formation of transport systems, and the modeling of geodynamic processes in the mountain range.
  • The priority direction of improvement of the processing capacities of the hydrometallurgical plant No. 2 is the necessary modernization of the process equipment with an increase in ore processing capacity by 8-10%. Transfer of MMC 70x23 mills to a gearless drive; Implementation of automated control systems and management of grinding and classification processes; Implementation of an automated system for promoting ion-exchange resin by sorption pachuc and dosage of fresh resin into the process; Increase in the front of sorption processing; Optimization of the parameters of the "career-plant" system have been developed.

Improvement of technology of gold-bearing ore processing

 

*   Crushing of oversized ore to the size of grate cells of the receiving hopper;

*   Limitation on the time of sorption processes;

*    Development of the advanced technological scheme of wet self-grinding mill MMC 70 × 23 170 t.;

*   Processing of bio oxidation cakes with increased content of sulphide sulfur and organic carbon by sorption cyanidation.

*   Sorption extraction of gold from solutions and pulps with an increased content of thiocyanates;

*   Optimization of the flotation process;

*   Increase the efficiency of the cooling system of BIOX reactors;

*   Optimization of the process of sorption cyanidation of the BIOX product.

*   Investigation of the possibility of selective mining and storage of different types of ores in the fields Daugyztau and Kokpatas;

*   Research and development of methods for weakening gold-bearing ores by exposure to high-frequency electromagnetic radiation;

*   Research and development of methods for weakening gold-bearing ores by exposure to high-frequency electromagnetic radiation;

*   Research and development of methods for the enrichment of gold from spent parts of the heap leach pads;

*   Research and development of methods for beneficiation of dumps in the ore extraction of the Muruntau deposit.

*   Research and development of methods for beneficiation of dumps in the ore extraction of the Muruntau deposit;

*   Investigation of the possibility of selective flotation of sulphide ores using local flotation agents, the basis of which is the waste of oil refineries in Uzbekistan;

The gold output using advanced BIOX® technology of hard-to-process sulfide ore from the Kokpatas and Daugyztau fields will gradually increase to 30% of the total output of the plant.

The sulphide ore of Kokpatas and Daugzytau deposits extracted in quarries is subjected to ore separation separation with obtaining a concentrate of ore separation; Flotation enrichment of initial ores and concentrates of ore dressing; Biochemical leaching of flotation concentrates; Sorption cyanidation of gold from biooxidation products; Sorption of flotation tailings.

The use of the technology of preliminary separation of ore at the ore-control station (RKS) and the lump-control ore at the ore-sorting complex (RCC) makes it possible to involve in processing the poor ore to meet the technological conditions of the GMZ-3 and to exclude from the technological processes about 60% of the initial ore with low content.

Taking into account the mining and geological and mining conditions of ore bodies, the development of reserves of Charmitan, Guzhumsai, and Intermediate fields is designed by underground mining operations, three mines - Zarmitan, Guzhumsai and Intermediate. Ore processing is envisaged at the hydrometallurgical plant № 4 (GMZ-4).

GMZ-4 was built within one year and began to process ore mined from the Zarmitan mine in 2010. GMZ-4 is the second hydrometallurgical plant built in the Republic for the years of independence. Currently, the Zarmitan mine is researching the problems of improving, upgrading the used development system with ore storage and finding an effective technology for the development of vein deposits with the use of self-propelled equipment

 

Enhancement of enrichment technologies and ore processing

 

  • Application local chemical flotation agents, it is necessary to increase the extraction of gold from sulfide refractory ores;
  • Applying local chemical flotation agents, it is necessary to increase the extraction of gold from sulfide refractory ores;
  • Processing of all man-caused wastes of mining and metallurgical production in the Kyzylkum region (dumps, quarrying of quarries, waste KV, off-balance gold-bearing dumps, tails from tailings after flotation and cyanidation, magnetic fraction of GMZ-2 and GMZ-3)
  • Development of cyanide neutralization technology in tail pulps of gold extraction plants with pre-extraction of precious metals
  • Improvement of technology for obtaining alloys based on rare metals (molybdenum, tungsten, rhenium, etc.)
  • Development of technology for the production of foam ceramic filters for gating systems, based on domestic enterprises;
  • Research and development of the technology for obtaining lining steel from the magnetic fraction - an intermediate waste of the process of processing gold-bearing ores.
  • Investigation of the possibility of using local manganese-containing conglomerates to produce manganese steel.
  • Development of a new sintering furnace for the processing of sulphide and carbonaceous cakes, materials and tails of gold recovery enterprises;
  • Research and development of technology for obtaining special alloys.

Enhancement of uranium mining and processing technology

  1. Process with intensive absorption of a washing liquid at drilling of chinks;
  2. Utilization of used vanadium catalysts for sulfuric acid plants;
  3. Development of high-efficiency and combined technology for the extraction of rhenium by the PV method to produce a commercial product;
  4. Definition of geological and technological parameters and technology of mining by the method of underground leaching in the deposits of the Kyzylkum region;
  5. Development and application of highly efficient methods of construction and operation of wells for uranium mining located at depths of 450-600 m by the method of underground leaching;
  6. Scientific and technical sustainability of the applicability of various oil wells for the construction of deep wells;

Research and development of highly effective bio geo-technological methods for extracting uranium from techno-genic formations of the underground leaching process.