Optimization of Deep Hole Construction Technology in Cutting Roadway of Deep Mining in Iron Mine

At present, the domestic steel market downturn, how to reduce the ratio of mining cut, effective control of dilution and ore loss, reducing the cost, is the top priority of mining enterprises, is now a key factor in mining enterprises can survive. Xining Special Steel Subei County Boren Mining Development Co., Ltd. qijiaojing deep mining of iron ore by the Shandong Academy of metallurgical design, inclined belt, shaft joint development, China China Metallurgical Group Corporation and managed by the shares of gold mining integrity Co., Ltd. joint construction. Deep development began in June 2010, and on October 1, 2014, the construction of the belt inclined shaft and the underground smashing transportation system was completed and put into operation. The remaining iron ore reserves in the deep mining of Qijiao Iron Mine are 84.08 million tons, the average grade is TFe32.58%, the design service life is 18.9a, the first year is 2.5 million tons, and the later 12.3a is 3.6 million tons. 5.6a is 3 million tons. In October 2013, China Huaye Science and Technology Group Co., Ltd. undertook the infrastructure construction mining task. In August 2014, China Huaye Science and Technology Group Co., Ltd. and Suba County Bolun Mining Development Co., Ltd. signed a 5a long period. Contract for mining, the mining section is 13#～21# exploration line.

The ore body has a dip angle of 52°～55°, and the ore body has a horizontal thickness of 8～20m. It is mainly a medium-thick ore body. The individual sections are thick ore bodies. The height of the design and planning stage is 65m, which is 2215m middle section, 2150m middle section and 2020m. In the middle section, the section height is 15m, mainly adopting the stage empty field method of section rock drilling and stage mining, and the local tailings mining by shallow hole retention method. In order to greatly reduce the production cost of the mine, this study optimizes the deep hole construction process in the cutting tank.
1 cutting and cutting engineering arrangement
The demolition construction process is used to arrange the extra-vehicle lanes and the outflow roads in the last layer of each middle section, and the other layers are not designed. The mining engineering is arranged along the direction of the ore body. The mining and cutting works mainly include: 1 gully, which is arranged in the contact zone of the lower ore rock in the last layered ore body of each middle section, and ensures the ore body area to occupy the sectional area of ​​the roadway during construction. /3～1/2, to facilitate the arrangement of the blasthole; 2 the ore approach, which is arranged between the last layered bottoming lane and the outflowing alley in each middle section, generally obliquely about 50° with the mining roadway. Or vertical arrangement, the length of the ore approach should meet the requirements of the scraper mining; 3 the mining smooth roadway, arranged in the last layer of each middle section, 10 to 15m away from the ore body, basically parallel to the trench layout, The construction along the ore body is adjusted according to the change of the ore body; the 4 section rock drilling road is arranged in the contact zone of the ore rock in each section; the 5 cutting lane is arranged on the starting side of the exit direction of the stope (Figure 1 6-person contact lane, arranged in the position of the column, connected with the rock-drilling lane and the lower plate along the vein lane, which is the pedestrian and ventilation passage during the mining stop; 7-slide, each stage is arranged with a one-stage slipper every 200m to meet The mining tasks in each middle section; 8 prospecting lanes, occasionally belonging to the same lane as the connecting lane, requiring passage through the upper body of the ore body, For the use of mines, the prospecting lanes are arranged in various sections. For the thicker stope of the ore body, the double rock drilling lanes should be arranged in layers (Fig. 2).

2 Optimization of deep hole construction process in cutting roadway
2.1 Deep hole construction technology in cutting lane
Due to the convenient operation and low cost of the YGZ-90 drilling rig , most of the current domestic metallurgical mines use deep holes in the construction of this type of drilling rig . Because the blasting effect of the cutting groove directly affects the mining effect of the entire stope, the cutting lane position is often arranged perpendicular to the cutting lane. Because the ore body generally has a certain inclination angle, the cutting lane needs to be constructed beyond the ore core of the ore body to a certain length. After the deep hole arrangement in the cutting lane is arranged, the medium-deep hole can be designed, and the medium-deep hole row surface is generally arranged in an umbrella shape perpendicular to the cutting lane.
2.2 Process optimization
According to the conventional design, in the case of mining, in order to reduce the amount of cutting and cutting, no external roadway is provided. When arranging the cutting lane, perpendicular to the ore body construction to the lower plate, it is necessary to exceed the length of the lower plate rock ore boundary (the specific value depends on the inclination of the ore body), and the 2203m horizontal S214 stopway cutting lane is arranged as shown in Figure 3(a). Show. After the cutting lane is optimized, it can be perpendicular to the construction of the ore body to the contact between the lower plate and the upper plate. It is not necessary to pass through the lower bed ore boundary, which shortens the construction length of the cutting lane to a certain extent, and the 2203m horizontal S214 stop cutting roadway The optimized layout is shown in Figure 3(b).

In the conventional design, the layout of the cutting lane is arranged perpendicular to the cutting lane. The layout of the 2203m horizontal S214 stopway cutting lane is shown in Figure 4(a). The cutting lanes are optimized, and the layout is arranged close to the lower part of the ore body along the cutting lane. The arrangement of the cutting lanes optimized by the 2203 level S214 stop is shown in Figure 4(b).

After the optimization of the cutting lanes, according to the 2203m level and the previous layer of ore body conditions, elevation, pulse roadway and other basic data, draw a section of the ore body along the cutting lane to arrange the corresponding row, on the basis of the design Deep hole, 2203m horizontal S214 stop S6 medium deep hole design shown in Figure 5. In the middle and deep hole construction, the YGZ-90 drilling machine can be rotated by 90°, and the angles of the holes of the S3～S7 row are the same, so that the blasting is performed when the mine is falling [1-3].

3 Conclusion
In the deep mining construction process of the Qijiaojing Iron Mine, on the basis of adopting the de-mining method, the construction process of the cutting groove and the medium-deep hole construction process were optimized, and the construction progress was accelerated (the cutting groove of each stopway was shortened). The average is about 10m), which reduces the investment cost and effectively controls the depletion and loss of ore. It has certain reference value for similar mines.
references
[1] Xu Yongzhen. Mining science [M]. Beijing: China University of Mining and Technology Press, 2000.
[2] Guan Xueming, Liu Hongyi, Zhang Guoyun, et al. Application of wide-pitch small resistance line millisecond differential blasting technology in open pit mine [J]. Modern Mining, 2016 (1): 58-60.
[3] Niu Kui. Application of hole-by-hole differential detonation technology in the descending section of the black trenching well [J]. Modern Mining, 2015 (1): 60-61.
Author: Wang Baodong; China, China Metallurgical Group Corporation;
Article source: "Modern Mining": 2016.03;
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