Reduce the cost of mining iron ore mine at this stage the key corporate earnings, open up selected mode of transport was the most important factor affecting the cost of ore mining, so select the appropriate mode of transport to explore the open pit mine to achieve sustainable development of great significance. The IPCC system has the advantages of large transportation capacity, low cost and high degree of automation, and has gradually become the first choice for large-scale open-pit mines to reduce costs and increase efficiency. This study takes a large open-pit iron mine in Australia as an example to analyze the application direction of the IPCC system in detail, and further discusses the technical advantages of the IPCC system by comparing with the traditional automobile transportation system. The IPCC system tape transportation process is shown in Figure 1. 2 Slope mine pit, each with two parallel adhesive tape 4 after the tape parallel to the surface divided into five tapes, wherein the waste rock belt conveyor 3, and with the beneficiation plant tailings out of the conveyor belt 3 confluence, The mixture of waste rock and tailings is transported to the waste rock/tailing yard; the other two belts transport the ore, and three coarse ore yards are piled up by two stackers to feed the concentrator. The total length of the mining tape is about 70km, the tape transportation speed is 5.5m/s, the maximum conveying capacity of a single tape is nearly 18000t/h, and the total conveying capacity of the IPCC system is about 1.72 million t/d, which can meet the requirements of mine production scale. The installation capacity of mine tape is shown in Table 2. The waste rock inside the pit is combined with the tailings of the concentrator, and is transported to the waste rock/tailing yard by the IPCC system and stored by the unloader. 1 The total investment of the project is small, the total investment of the IPCC system project is 18.8 billion, and the total investment of the traditional automobile transportation project is 19.3 billion; 2 The transportation cost is low. When the mining depth does not exceed 150m, the cost of automobile transportation and IPCC system is roughly equal. When the mining depth exceeds 150m, the transportation cost of the vehicle increases sharply. For every 100m deepening, the cost increases by 50%, and the IPCC system increases every 100%. The depth of 100m is only increased by 5% to 6% [2]. The ore transportation cost of the IPCC system in this study is only 35 yuan/t, and the unit ore cost of the traditional automobile transportation mode is 62 yuan/t; 3 The ability to climb is large. The traditional road transport has a slope of 8%, and the buffer section needs to be set. The slope of the IPCC system can reach more than 25%, which can greatly shorten the transportation distance, improve the transportation capacity and reduce the transportation cost. 4 low labor intensity, low labor demand, high degree of automation of IPCC system, low labor intensity, can significantly reduce mine labor demand, can greatly reduce mine operating costs; 5 The environmental pollution is small. Compared with traditional automobile transportation, the IPCC system can greatly reduce the carbon emissions of mine transportation and reduce noise and air pollution.
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1 IPCC System Overview
The reserves of a large open-pit iron ore mine in Australia amounted to 4.5 billion tons and the TFe grade was 15%. The mine design ore mining scale is 170 million t/a and the stripping ratio is 1.5. After optimization of the open-air boundary, the mine will form two open pits with a length of about 6km and a middle part connected. The pit depth is about 700m. The IPCC system is responsible for rough crushing and transportation of mine waste rock in mine pits, loading of iron concentrates, and storage of waste rock and tailings. The system has functions such as coarse crushing, belt transportation, coarse ore yard stacking/reclaiming, and waste rock/tailing stockpiling.
1.1 rough crushing
The IPCC system ore and waste rock crushing equipment includes Fullmobile Crushing (FMC) equipment and Semimobile Crushing (SMC) equipment. After the blasting of the stripping working face, the ore can be loaded into the mining truck through the excavator, transported to the SMC equipment for coarse crushing, and the crushed qualified ore is transported by tape; the FMC equipment can also be placed on the mining working surface. The excavator directly loads the ore into the FMC equipment for coarse crushing, and the crushed qualified ore is transported by tape [1]. The main parameters of the IPCC coarse crushing system are shown in Table 1. 
1.2 tape transport
1.3 coarse ore yard pile / reclaim
In order to ensure the continuity of the operation of the mine concentrator, the mine has set up a coarse ore yard that can meet the ore supply capacity of about 5 days. The stacker and reclaimer units of the IPCC system are a key part of the operation of the coarse ore yard.
1.4 waste rock / tailings yard storage
2 IPCC system technical advantages
Compared with the traditional automobile transportation mode (all mines and waste stones are transported by 290t mining dump trucks), the technical advantages are as follows:
3 Conclusion
Taking a large open-pit iron mine in Australia as an example, the function of IPCC system is discussed. By comparing with the traditional automobile transportation mode, the technical advantages of IPCC system are further analyzed, which has certain reference value for further promotion and application of this system in open pit mines. .
references
[1] Li Baoxiang. Mining Manual [M]. Beijing: Metallurgy Industry Press, 1991.
[2] Wang Huilai. Large-scale open-pit mine transportation system program research [J]. China Mining Engineering, 2014, 43(1): 20-22.
Article source: Modern Mining, 2011.5
Author: Wang Junsheng Railway Engineering Consulting Group Co., Ltd: