RESERVES TO INCREASE PRODUCTIVITY OF «QUARRY TRANSPORT – CRUSHING-AND-CONCENTRATING PLANT» SUBSYSTEM TAKING INTO ACCOUNT CRUSHING EQUIPMENT UTILIZATION FACTORS

• Main Authors: Artem G. Zhuravlev, Vladimir A. Cherepanov
• Format: Article
• Language: Russian
• Published: Tomsk Polytechnic University 2020-11-01
• Series: Известия Томского политехнического университета: Инжиниринг георесурсов
• Subjects: quarry transport; crusher; receiving bin; availability rate; efficiency; productivity; crushing equipment
• Online Access: http://izvestiya.tpu.ru/archive/article/view/2902/2356
• ISSN: 2500-1019; 2413-1830

The relevance. Under current conditions, when it is necessary to increase the production capacity of existing mining-and-processing integrated works, the growth in productivity of the quarry cannot be considered in isolation from the capabilities of crushing and processing mills. When solving issues of increasing the capacity of quarry transport, it is necessary to pay attention to optimization of its interaction with the primary stages of enrichment production, and for this purpose it is necessary to consider it together with the link of main transport as a single technological system. The main aim of the study is to identify reserves for increasing the productivity of the subsystem enterprise «quarry transport – crushing-and-concentrating plant» taking into account the utilization factors of crushing equipment based on a synthesis of experience in its operation and the requirements for operational reliability prevailing in modern conditions. Objects: quarry transport and crushing equipment. Methods: motion-time study, statistical data processing, systematization, analysis and generalization, performance calculation. Results. The most common technological schemes of transport and crushing equipment used at modern mining and processing plants are structured. The key limiting factors for increasing productivity for the subsystem of the mining enterprise «quarry transport – crushing-and-concentrating plant» are identified. Calculations of the achievable loading intensity by various mining vehicles for stable high-performance crushers work were made. The reliability indicators of crushers are determined and calculated. The main factors affecting their operational reliability, the required frequency and amount of repair work, as well as the time of productive work are identified. An analysis of the operating experience of crushers is carried out and the requirements for the organization of their work and the loading order are formulated to ensure high performance. In conditions of necessity to increase production capacity of existing mining and processing plants, it is important and feasible to use reserves to increase productivity of existing crushing equipment: 10–30 % due to provision of uniform supply of transport for unloading, 5–10 % due to optimization of operation procedure of the crushing and processing plant circuit in time, 3–5 % due to improvement of maintenance and repair. At the same time, the increase in the utilization factor of equipment of crushing and enrichment factories should be considered in relation to operation of technological quarry transport. For the stable high-performance work of transportation and processing facilities of a mining company, it is necessary to simultaneously organize the interaction between transport and crushing equipment and form an effective system to ensure the operability of this equipment, including by maximizing the use of technical capabilities.