Method for underground mining of sloping and inclined ore bodies in cryolite zone

FIELD: mining.

SUBSTANCE: prior to start of filling works, a recumbent side of a section in a mined space to be filled is poured with water to form an ice crust, afterwards the mined space is filled with crushed dead rocks or frozen briquettes from dressing tails. The ice crust makes it possible to apply self-flow filling at the minimum angle of inclination of a recumbent side equal to αmin.=arctgKfr, where Kfr - coefficient of friction as the filling material moves along the ice crust on the recumbent side of the mined space.

EFFECT: invention makes it possible to increase efficiency of filling works when mining sloping and inclined ore bodies in a cryolite zone due to expansion of a field of application of a self-flow method of dry filling material placement in a mined space by reduction of resistance to motion of this material on a recumbent side.

2 dwg

 

The invention relates to the field of mining and, in particular, to underground mining flat and inclined ore bodies in permafrost using bookmarks solid waste mining and mineral-processing.

There is a method of field development with gravity mined-out space [1]. The disadvantage of this method is the impossibility of its use in the testing of flat and inclined ore phone

The closest in technical essence and the achieved results is a method of underground mining gentle ore bodies and the tab using a scraper installations [2]. The disadvantage of this method is the impossibility of laying-out space, the high complexity and the complexity of the organization filling operations.

The aim of the invention is to increase the efficiency of filling operations when developing flat and inclined ore bodies in permafrost by expanding the field of application of the gravity method of placing dry backfill in mined-out space by reducing the resistance to movement of the material lying on its side.

This goal is achieved by the fact that before you begin filling operations footwall area goaf subject tab, watered by one of the known methods, for example the er by spraying through a nozzle, prior to the formation of ice crust, and then begin to fill dead space with the use of one of the known methods, for example, by unloading tripping cars on the top storey drift backfill material of one of the known types, such as crushed waste rock or frozen briquettes from tailings. The presence of ice lying on your side reduces the resistance to movement of backfill material lying on his side, and therefore allows the use of samotechny tab when the angles of incidence of the ore bodies, which is determined from the expression: αmin=arctgTrwhere αmin- the minimum angle of inclination lying flank under the terms of the resistance to movement of dry bookmarks ToTrthe coefficient of friction during the movement of backfill material on the ice crust lying on the side of the goaf.

The invention is illustrated by drawings, where figure 1 shows a process scheme of underground mining prohodimogo ore body using bookmarks solid waste ore dressing production; figure 2 shows a diagram illustrating the movement of backfill material lying on the side of the goaf.

Method of underground mining flat and inclined ore bodies in permafrost with a mined-out space hard about what moves mining and mineral-processing contains the story of preparatory development - the top 1 and bottom 2, the flank rising 3, longwall face 4, the bumper blast hole charges 5, repulsed ore 6, scraper installation 7, final Windows 8, organ shield 9, goaf 10, laying the sections 11, footwall 12, the pump unit 13, the nozzle 14, the ice crust 15, tiltable carriage 16, the filling material 17, filling the array 18.

The method is implemented as follows. After holding the top 1 and bottom 2 of preparatory workings and flank rising 3 begin mining operations in the mining face 4 moving along strike when blasting demolition blast hole charges 5. Repulsed ore 6 using a scraper installations 7 issue through the outlet window 8. Following the movement of the stope 4 developed in the space of 10 sets of organ lining 9, which separates the developed space 10 on laying areas 11. Before you start filling operations footwall 12 out space 10 within the lay of the land 11 water one of the known methods, for example, using a pump unit 13 for spraying water through nozzles 14. After freezing of water and formation of ice crust 15 lying on the side 12 by using the filling equipment is one of the known types, such as tiltable carriage 16, serves backfill material 17 of one of the known types, for example, draw the summer barren rock or frozen pellets from tailings, in the pledged portion 11, on completion of which it is formed filling the array 18 (Fig 1). The movement of the filling material 17 on the ice crust 15 at small angles of inclination lying flank 12 is secured owing to the low coefficient of friction between ice 15 and backfill material 17 (figure 2). The minimum value of the angle (αmin) lying side 12 with ice 15 is determined from the condition of equality: Psinαmin=KTrPcosαminwhere P is the weight of a single piece of filling material 18, KTrthe coefficient of friction between ice 15 and backfill material 17. Hence KTr=tgαminor αmin=arctgKTr.

Sources of information

1. Manitou V.R., Zhigalov M. Technology, mechanization and automation of filling operations at the mines. M.: publishing house of MHI, 1966. 152 C. (Fig.4, p.14).

2. Smondyrev AU Technology and mechanization of filling operations. M.: Nedra, 1974. 328 S. (RES, str).

Method of underground mining flat and inclined ore bodies in permafrost, which includes preparatory and rifled work, clean the recess and the mined-out space solid waste mining and processing production, characterized in that the footwall goaf before filling operations water to create ice, which provides the apply samotechny tab at the minimum angle of inclination lying flank, equal:
αmin=arctgKTr,
where KTrthe coefficient of friction during the movement of backfill material on the ice crust lying on the side of the goaf.



 

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