The article contains a comprehensive research method that covers the scientific
generalization and systematization of the theoretical analysis of the practical
application of layered milling technology in the development of iron ore deposits.
The technology of development of iron ore deposits as a whole meets all modern
requirements for opencast mining. It is flexible due to separate technological processes,
typical use of milling combines for mining the rock mass. A large number of tests and
efforts have been carried out to make it part of the traditional technology of open
mining of mineral deposits. However, the existing technological schemes need to be
refined in order to adapt to the existing technology for developing the rock mass in iron
ore pits [10].
Layer-by-layer milling of half-rocky rocks and rocky rocks leads to a large
amount of downtime of mining equipment and idle passages, which leads to its low
efficiency and to a significant increase in the cost of mining.
The study of technological schemes shows that it is possible to obtain a positive
result of solving the above problems when making non-standard technological
solutions. The improved technological scheme of work of mining combines in existing
deep pits allows the development of the formulated parameters of the elements of the
development system of the existing technology, which increases the efficiency of the
development of the field with milling combines when introducing new approaches and
manipulations in the technological scheme of their work.
The technological scheme developed by the authors of the article for the
development of a ledge using milling-type mining machines is implemented as follows.
The mining harvester 1 processes the rock layer with a direct load of them with its
conveyor system to the dump truck 2 (Fig. 1).
The combine 1 runs a layer of rocks only between the prism of a possible collapse
of the ledge and the lower eaves above the underlying ledge, and then it molds the layer
of rock with successive strips 3 parallel to the upper eaves of the ledge 4, thus not
exceeding the threshold of the prism of possible collapse 8, which is clearly observed
on the section A–A (Fig. 2).
After passing the required number of lanes, the mining combine 1 creates a
sufficient width of the working platform for starting the milling combine 6, which
successively strips 5 removes a layer of rocks along the line of the prism of a possible
collapse of 8 with a direct load of rocks in the dump truck.
When a mining combine of milling type 6 completed the working of a layer of
rocks of the entire thickness of the layer of rocks between the upper eaves of the ledge
4 and the prism line of a possible collapse of the ledge 8, as evidently observed in the
section В-В (Fig. 3), to work has the ability to proceed to the milling combine 1.
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