August 15, 2020

Application of tape transportation in mining of a gently inclined layered ore body

A copper deposit is gradually inclined layered deposits, ore huge scale, to the SN length 12km, east-west width 2.0 ~ 8.68km, horizontal projected area 48.34km2. The ore body is controlled by the sedimentary strata, and the whole is layered. The buried depth is 130-700m, the ore body inclination is 5°-20°, and the ore body is continuously stable with an average thickness of 6m. The deposit is a bedrock with a bedrock weathered fissure aquifer and a bedrock structural fissure aquifer. The aquifer is medium-strong and rich in water supply, and the recharge is relatively stable. The seasonal dynamic change of groundwater is not large, and the hydrogeological conditions of the deposit are moderate. The lithology of the strata in the mining area is relatively simple, mainly metamorphic sedimentary rocks, the weathering of the surface rock mass is strong, the rock mass structure is mainly layered structure, the unweathered rock is dominated by hard rock, the structure is relatively developed, and the high-steep fault is dominant. The weathering belt and structural belt have great influence on the mining, and the engineering geological conditions of the deposit belong to the medium type with hard and semi-hard layered rocks. The underground mine is subjected to room-column mining, shallow-hole blasting, and scraper mining, with a mining scale of 3 million t/a. In order to further promote the efficient and continuous production of the mine, this study explores the belt transportation scheme of the mine.
1 develop transportation plan
The ore body in the mining area is continuously stable and stable. It is a single-layer ore body with an average thickness of 6m and a buried depth of 130-700m. According to the mining technical conditions, the suitable development system has the tape inclined shaft, the slope road joint development and the single slope road development.
(1) Joint development of tape inclined shaft and slope road. The inclined shaft and the ramp are arranged in parallel. The distance between the roadway is 20m and the inclination is 11%. The gap between the inclined shaft and the slope is arranged every 100m. The inclined shaft is used as the underground ore transportation channel. The slope is used as the personnel and equipment. Material transport channel. After the inclined shaft and the slope of the tape are dug into the ore body, they are arranged along the floor and extend to each production stop. The underground ore is transported to the surface by tape. Tape specifications: capacity 730t / h, running time 16.5h / d, DTII (A), bandwidth 1m, belt length 1017m / strip, belt speed 3.15m / s, inclination 6.28 °, ST-2500, central Single drum double drive, central hydraulic tensioning device is tightened, power 2 × 250kW.
(2) Single slope development. Cancel the inclined shaft of the tape and use a single ramp to develop. The inclination angle of the main slope is 11%. After the slope is drilled into the ore body, it is arranged along the floor and extends to each production stop. The ramps serve as ore, material transportation, and access to personnel and equipment. The underground ore is transported to the surface by car. The 51t downhole dump truck is used. The volume of the unloading tank is 24~30m3. The outer dimensions of the equipment are 11570mm×3200mm×3160mm (length×width×height). The total load weight is 92t. It is equipped with inline 6 Cylinder diesel engine with a power of 515kW.
The comparable investment and operating expenses of the above two development plans are shown in Table 1. It can be seen from Table 1 that although the single slope road development can save the amount of roadway engineering, the price of the large-tonnage underground special vehicle is relatively high, and its comparable investment is higher than the joint development plan of the inclined shaft and slope road. Moreover, the transportation cost of the vehicle is also high. The cost of shipping the tape. With the increase of the underground transportation distance, the gap between the comparable investment and operating expenses of the two schemes is also increasing. In addition, the tape transportation also has the transportation capacity, the equipment and process system is simple, the operators are few, and the automation is easy. Mature, low pollution to the underground ventilation environment [1-3], it can be seen that the tape transportation is a suitable ore transportation plan for long-distance, large-capacity mines. In summary, the mine adopts a joint development plan for the inclined shaft and ramp of the tape, and the ore adopts a tape transportation scheme.

Table 1

2 tape transport system
The mining area of ​​the mining area is relatively large. The mining area is divided into one panel every 1km, and the main belt inclined shaft transportation capacity is 10000t/d. After the main tape inclined shaft and the slope road are drilled into the ore body, continue to extend along the north and south wings of the ore body. And the trailing edge is arranged every 1km to arrange a disc tape inclined shaft and two panel ramps, which are respectively connected with the main tape inclined shaft and the ramp. On both sides of the slope of the panel, a nugget (500m×200m) is arranged every 200m. There are transport lanes and return airway lanes in the mine block. The stopway belt is installed in the transport roadway. The ore is transported to the stopway through the stopway tape. In the center of the panel, it is transported to the surface of the main tape by the inclined tape of the panel. The belt transportation capacity of the panel is 10000t/d, and the belt transportation capacity of the stop is 5000t/d. The main tape parameters are shown in Table 2. The tape transport system is arranged as shown in Figure 1.

Table 2figure 1

3 stope ore shipping system

The underground is drilled by shallow hole room column method. The shallow hole blasting ore block can be controlled within 350mm. The stope ore is directly loaded into the stop tape by the scraper. The specific operation is as follows: the ore blasting ore is shoveled to the upper unloading platform of the stopway by the scraper, and the unloading platform is provided with a sieve. The ore with a block size less than 300mm passes the vibration below the sieve to the ore to give the ore to the ore. After entering the stope tape, it is transported out of the stope. The ore with a block size greater than 300mm is crushed by hydraulic breakers and then re-shoveled to the stop tape. The power of the hydraulic breaker motor is 90kW. The stope ore shipping system is shown in Figure 2.

figure 2

4 Conclusion
The characteristics of a gently inclined layered deposit and the problems existing in the ore transportation system of the mine are analyzed. A joint development plan for the inclined shaft and slope of the tape is proposed. The belt transportation system can fully adapt to the ore body space production, and the belt transportation efficiency can be fully utilized. It has the advantages of low transportation cost, large transportation capacity and reliable system. The main tape and the panel tape are made of standardized tape conveyor. With the deepening of the underground mining, the tape is lapped and extended, the impact on production is small, the replacement time of the panel is short, and the production is stable. In addition, the tape transportation system can be extended to For each stop in each panel, the ore is directly loaded with tape by the scraper, which greatly simplifies the underground production process and improves the automation and continuity of ore transportation.
[1] Li Shoushan, Yan Jialong, Gao Zhongmin, et al. Discussion on the transportation technology of underground tape in gently inclined ore body [J]. Chemical Minerals and Processing, 2016(2): 55-57.
[2] Wu Aixiang, Gu Desheng, Yu Youlin. [J]. Our underground metal mines continuous mining technology. Metal Mine, 1998 (7): 1-3.
[3] Yu Nanzhong, Zhang Zhixiong, Guo Zhixin. Application and discussion of tape inclined well in metal mine and deep well development [J]. China Mining, 2012(S): 560-565.
Author: Guo Yanzhong; Xiamen Zijin Engineering Co., Ltd.;
Article source: "Modern Mining"; 2016.8;

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