DOI: 10.18503/1995-2732-2020-18-1-16-22
Abstract
Relevance and purpose of the study. The increasingly complicated conditions in which solid mineral deposits are developed define the need to optimize mining equipment and the ways in which it is exploited. When developing complex structure deposits, it sometimes happens that a significant amount of mineral raw materials is dumped together with substandard ores. In the case of many ores, the process of explosive or mechanical loosening results in the concentration of valuable components in ore fines. This is especially typical of ores with sulphide impregnation associated with quartz. Screening substandard ores to separate fines, as well as additional transportation and transfer operations require significant costs. Objectives. The objective is to design a mining excavator that would have the capability to separate concentrated ore fines from substandard ore directly during excavation. At the same time, unloading of concentrated ore fines and the remaining substandard ore should take place simultaneously for better performance. Findings. This paper describes an optimised excavator design, as well as application guidelines for the development of complex structure deposits. The hydraulic mining excavator is equipped with a bucket with screening surfaces located inside the bucket on its front wall and on the drop bottom. There are cavities between the screen stiff-eners that are connected to collectors. The fine material goes through the openings in the screening surfaces into the cavities and then into the collectors. From the collectors it is transported with air flow through pipelines to the preliminary separator of the vacuum unit, where it accumulates and is regularly discharged into a special vehicle. The substandard ore remaining in the bucket is dumped into dump trucks. Conclusions. The use of the bucket of the proposed design with fixed screening surfaces will reduce the excavator cycle time due to combined unloading of ore fines and coarser material. Such bucket can be installed on most hydraulic excavators following minimum retrofitting. Separation of concentrated ore fines from the substandard ore zone of the blasted block will increase the recovery factor and the throughput, which will reduce the mining costs and make the operations more cost-effective.
Keywords
Complex structure deposits, substandard ore, mining excavator, bucket, screening surfaces, vacuum unit, dump truck.
For citation
Cheban A.Yu., Sekisov A.G. Mining Excavator with the Capability to Separate Concentrated Ore Fines. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2020, vol. 18, no. 1, pp. 16–22. https://doi.org/10.18503/1995-2732-2020-18-1-16-22
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