project Quantity Mining ratio (m/kt) Mining capacity (t/d) Deep hole collapse in each meter Cut top (t/m) Falling ore (t/m) Loss rate (%) Depletion rate (%) Direct ore cost ( yuan / ton ) 16.3 464.2 Â 2.46 3.23 23.7 8.8 5.95 Speciality Silica,Specialty Silica,Absorbent Powder And Thickening Agent,Prevent Caking With Long Storage Time Henan Minmetals East New Materials CO. LTD. , https://www.eastmaterials.com
9-lateral electric chamber; 10-manly ventilated patio; 11-wind-powered rope gun [next]
Deep hole advanced cutting roof column mining method in Luding copper mine
The mine is a gently inclined ore body with a thin to medium thickness deposited in the lake. The inclination angle is 10 ° ~ 20 °. The thickness of the ore body is 0.69~17.5m, with an average of 7m. Ore body is dark gray feldspar quartz sandstone, f = 18 ~ 22, the top plate is a light-colored long quartz sandstone, f = 15 ~ 17, bottom plate purple sandstone f = 15 ~ 18.
The ore block is 35~50m long, the mine span is 24m, the mine wall is 5m wide, and the stage pillar is 10m high.
The order of mining in the mining room is as follows: pulling the cutting trough, the middle and deep hole falling mine, the middle and deep hole leading the cutting top, the electric picking out, and the nylon rope which is thrown by the rope thrower drags the steel rope to the top platform hanging pulley.
Cut the top layer 3m high. The cutting top working face is 5~7m ahead of the working face. Use a throwing blast to cut the top to provide a working platform for cleaning the roof, installing the anchor and hanging pulleys, as shown in Figure 1.
Figure 1 Deep hole advanced cutting roof pillar mining method
1-stage transportation roadway; 2-mining communication roadway; 3-electricity communication roadway; 4-electricity room;
5--mining slippery well; 6-cutting top working face; 7-cutting top rocking uphill; 8-recovering rock drilling uphill;
The arrangement of the deep holes in the top of the cut is radial, as shown in Figure 2. Rock drilling with YZ-90 rock drill, the hole diameter is 58-60mm, the row spacing is 1.0m, and the hole bottom distance is 0.5~1.5m. Blasting with No. 2 rock ammonium nitrate explosive, the charge factor is 0.75-0.8. In order to strengthen the throwing effect of ore blasting ore blasting, a row of medium and deep holes is added in the middle of the deep holes in the last two rows of each cutting step. The cutting step distance can reach 5~7m, and the amount of ore throwing the topping platform can reach 80~90%. The actual height of the top layer is 2.3 to 3.5 m, and the platform and the top plate are substantially flat.
Figure 2 Cut the top layer in the deep hole layout
It is mined with a 30kw electric raft. The F-602 mine pneumatic rope thrower is installed in the electric raft room. The rope thrower is powered by the wind, and the warhead with nylon rope is launched from the electric chamber to the topping platform. The main technical specifications of F-602 type mining pneumatic rope thrower are: barrel length 700mm, warhead weight 340g, nylon rope diameter 2~4mm, maximum wind pressure 0.5MPa, maximum effective horizontal range 60m, launch elevation angle 0°~ 40°, weighs 40kg, and the outer dimensions are 1650×450×1050mm.
The ore body below the top layer is mined with a fan-shaped medium-deep hole, with a diameter of 58-60 mm, a row spacing of 1.2 m, and a hole bottom distance of 1.4-1.8 m. Each time the falling step is roughly the same as the cutting step. The blasting uses No. 2 rock ammonium nitrate explosive and non-electric millisecond detonating tube, and the charging coefficient is 0.75-0.8. [next]
The main technical and economic indicators are shown in Table 1.
Table 1 Main technical and economic indicators
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The main advantages of this mining method are: high-cutting and falling mines with medium-deep holes, high labor productivity, and large production capacity of mines; workers clean the roof, install anchors and hang pulleys on the topping platform, basically not It is safe to work in the mining room that enters the goaf; it is easy to control the roof boundary and the depletion rate is low. The disadvantages are: the mine wall of the room can not be recycled, the ore loss rate is high; the roof of the ore body is required to be flat, and the thickness of the ore body is relatively stable.