Method for calculating transportation cost of electric mine truck of surface mine

Abstract

The invention discloses a surface mine electric mine truck transportation cost calculation method, and belongs to the technical field of mining transportation cost estimation. The method comprises the steps that according to a mine geologic model and mining design, an ore body is divided according to steps, and the annual mining quantity and the waste rock quantity of each step are obtained; measuring the sizes of a long axis and a short axis of each step; based on the step size, the platform gentle slope section distance, the ground surface transportation road length and the elevation difference, the horizontal transportation distance and the inclined transportation distance are calculated; calculating the transportation energy consumption cost of each step in combination with the power consumption parameter of the electric mine truck; and summarizing the transportation cost of each year to obtain the total transportation cost of the mine. The method can accurately reflect the transportation cost of the electric mine truck under the energy recovery condition, and is particularly suitable for comparison and selection of transportation schemes of deep surface mines.

Description

Technical Field

[0001] The present invention relates to the technical field of open-pit mining, and specifically to a method for calculating the transportation cost of electric mining trucks in open-pit mines. Background Art

[0002] In recent years, with the development of new energy technologies, electric mining trucks have been applied in the transportation link of open-pit mine exploitation. Electric mining trucks are gradually applied in mines due to their advantages of less energy consumption, less pollution, and low cost. In the past, the transportation cost of mine trucks was generally roughly estimated using the single-mine transportation cost of similar mines. However, electric mining trucks can collect energy during transportation, especially in the environment of heavy-load downhill, and the power generation efficiency is higher. Simple similar comparisons cannot accurately reflect the true transportation cost. Therefore, a more accurate calculation method is needed to measure the transportation cost of electric mining trucks and provide a comparison basis for mine transportation plans. A method for calculating the transportation cost of electric mining trucks in open-pit mines is of great significance for the selection of the development and transportation plan of deep open-pit mines.

[0003] In the past, the transportation cost of electric vehicles in mines was generally estimated using the transportation cost of similar mines. However, the occurrence depth and state of ore bodies in each mine are different, especially the ore body shapes in non-ferrous metal mines are diverse. Therefore, a more accurate transportation cost calculation method is needed to ensure that the transportation plan is more reasonable and economical during the mine exploitation planning process. Summary of the Invention

[0004] The main purpose of the present invention is to solve the problems existing in the above-mentioned prior art and provide a method for calculating the transportation cost of electric mining trucks in open-pit mines.

[0005] The technical solution of the present invention is as follows: A method for calculating the transportation cost of electric mining trucks in open-pit mines includes the following steps: S1. According to the preliminary design document of the mine and the geological model, divide the ore body of the mine into benches. The ore mining volume of the m-th bench in the n-th year from top to bottom is denoted as Q n-m , with the unit of ton, and the stripping waste rock volume is denoted as q n-m , with the unit of ton;

[0006] S2. According to the annual end-of-year mining boundary map of the preliminary design, measure the long axis A and the short axis B of each bench. The long axis of the m-th bench measured in the n-th year-end is denoted as A n-m , the short axis is denoted as B n-m , A n-m ≥B n-m ;

[0007] S3. Calculate the horizontal transportation distance and the inclined transportation distance of each bench at the end of each year. Among them, the horizontal transportation distance of the m-th bench at the end of the n-th year , in the formula L hL0 represents the distance of the gentle slope section of the platform, and L0 represents the road length from the surface access ditch to the crushing station; the inclined transport distance of the m-th step at the end of year n. In the formula, H0 is the elevation of the ground surface entering and exiting the ditch, H m Let i be the elevation of the m-th step, and i be the road slope.

[0008] S4. Calculate the transportation energy consumption in year n. In the formula, j is the total number of steps, t is the tonnage of the mine car, K1 is the average power consumption for round trip on flat ground, and K2 is the average power consumption for round trip uphill / downhill.

[0009] S5. Calculate total transportation energy consumption. In the formula, p is the final year of the mining design, and the total cost is obtained by multiplying the total energy consumption by the electricity price.

[0010] Furthermore, in step S4, K1 represents the average power consumption for round-trip ore transport on a fully loaded flat road and an empty flat road, in kW·h / km; K2 represents the average power consumption for round-trip ore transport on a fully loaded uphill road and an empty downhill road, in kW·h / km.

[0011] Furthermore, when the mine car is going downhill fully loaded or going uphill unloaded, K3 is used instead of K2, where K3 is the power consumption parameter for the corresponding working condition.

[0012] Furthermore, the calculation method for energy consumption in waste rock transportation is the same as that for ore transportation, except that the ore quantity Q is used. n-m Replace with waste rock quantity q n-m Replace L0 with the distance L to the spoil heap. 1。

[0013] Furthermore, based on the actual consumption and management technology level of the mine, the total costs of labor, tire consumption, auxiliary oil, maintenance and depreciation are estimated. The total cost of the mine transportation process can be obtained by adding the estimated total cost to the calculated G.

[0014] Compared with the prior art, the present invention has the following advantages: The present invention can comprehensively consider the uniqueness of each mine's ore quantity, ore occurrence depth, and transportation distance of each bench, and make a comprehensive estimate of the transportation cost of ore and stripped waste rock in non-ferrous metal mines. It can provide a calculation method for estimating the transportation cost of electric mining trucks in deep open-pit mines of non-ferrous metals. Attached Figure Description

[0015] Figure 1 This is a mining boundary map of a mine at the end of year n-1 in an embodiment of the present invention;

[0016] Figure 2 This is a mining boundary map of a mine at the end of year n in an embodiment of the present invention;

[0017] Figure 3This is a cross-sectional view of a mine in the (n-1)th year and the end of the nth year in an embodiment of the present invention;

[0018] In the diagram: 1. Minor axis B （n-1）-9 2. Long axis A （n-1）-9 3. The bottom perimeter of the 9th step at the end of the (n-1)th year; 4. The gentle slope section of the transport road platform; 5. The sloping section of the transport road; 6. The short axis B. n-9 7. Long axis A n-9 8. Bottom perimeter of the 9th step at the end of year n; 9. Surface elevation H0; 10. aa profile line of year n-1; 11. aa profile line of year n; 12. Mining and rock profile of the 9th step; 13. Bottom elevation of the 1st step H1; 14. Bottom elevation of the 5th step H5; 15. Bottom elevation of the 10th step H 10 16. Elevation H at the bottom of the 15th step 15 . Detailed Implementation

[0019] like Figure 1-3 As shown in the figure, this embodiment provides a method for calculating the transportation cost of electric mining trucks in a large open-pit mine. The basic parameters of the mine are as follows:

[0020] Mining period: p=5 years, number of benches: j=10, mine car load capacity: t=100 tons, road gradient: i=8%;

[0021] The elevation of the surface entering and exiting the ditch is H0=500m, the distance of the platform gentle slope section is Lh=200m, the distance from the surface to the crushing station is L0=1500m, and the distance from the surface to the spoil heap is L1=1000m;

[0022] Energy consumption parameters: K1 (average round trip energy consumption on flat road) = 5 kWh / km, K2 (average round trip energy consumption for fully loaded uphill and unloaded downhill) = 12 kWh / km, K3 (average round trip energy consumption for fully loaded downhill and unloaded uphill) = 3 kWh / km

[0023] The specific calculation method includes the following steps: First, calculate the transportation energy consumption for each year, taking the third year as an example.

[0024] Based on the geological model and mining plan, the ore and waste rock quantities for each bench in the third year are shown in Table 1 below.

[0025]

[0026] Based on the mining boundary maps at the end of year 2 (year n-1) and the end of year 3 (year n) (similar to the attached map) Figure 1 and 2 ), measure the major axis (A) and minor axis (B) of each step, as shown in Table 2 below.

[0027]

[0028] Calculate the horizontal transport distance L based on the parameters in the table. 3-1 and inclined transport distance H 3-1 :

[0029] L 3-1 =(π-2)×(B 3-1 +B 2-1 )+2×(A 3-1 +A 2-1 )+2×L h ×(1-1)+2L0

[0030] =(3.1416-2)×(300+280)+2×(400+380)+2×200×0+2×1500

[0031] =5222.13 meters.

[0032] H 3-1 =2×(H0-H1) / i=2×(500-480) / 0.08=500 meters.

[0033] Calculate the energy consumption for ore transportation in the 3rd year, for the 1st step (m=1):

[0034] Train number: Transport volume / vehicle weight = 500,000 tons / 100 tons / vehicle = 5,000 train numbers;

[0035] G 3-1 =Train number × [(L 3-1 ×K1)+(H 3-1 ×K2)] / 1000=5000×[(5.222km×5kW·h / km)+(0.5km×12kW·h / km)] =160550kW·h. The electricity cost for the first stage of transportation in the third year is total energy consumption × electricity price = 160550kW·h × 0.8 yuan / kW·h = 128440 yuan.

[0036] Calculate the electricity costs for the other steps in the third year using the same method, and sum them up to get the total transportation electricity cost for the third year.

[0037] The above are the ore transportation costs for year 3. The waste rock transportation costs for year 3 also need to be calculated, using the same method as for ore, but with Q removed from the formula. n-m Replace with q n-m Replace L0 with L1.

[0038] In the third year, the total transportation cost of the mine was the sum of the ore transportation cost and the waste rock transportation cost.

[0039] Similarly, the total transportation electricity cost for each year from year 1 to year 5 can be calculated using the above method. The total transportation cost for the mine is then calculated by adding up the costs for each year, plus labor costs, maintenance costs, depreciation costs, and asset depreciation of the electric mining truck and its charging equipment.

Claims

1. A method for calculating the transportation cost of electric mining trucks in open-pit mines, characterized in that, Includes the following steps: S1. Based on the preliminary mine design documents and geological model, the mine ore body is divided into benches. The ore volume mined from the m-th bench in the nth year is denoted as Q. n-m The unit is tons, and the amount of waste rock stripped is denoted as q. n-m The unit is tons; S2. Based on the preliminary design and the mining boundary map at the end of each year, measure the major axis A and minor axis B of each step. The major axis of the m-th step measured on the map at the end of year n is denoted as A. n-m The minor axis is denoted as B. n-m A n-m ≥B n-m ; S3. Calculate the horizontal and inclined transport distances for each step at the end of each year, where the horizontal transport distance for the m-th step at the end of year n is... In the formula L h L0 represents the distance of the gentle slope section of the platform, and L0 represents the road length from the surface access ditch to the crushing station; the inclined transport distance of the m-th step at the end of year n. In the formula, H0 is the elevation of the ground surface entering and exiting the ditch, H m Let i be the elevation of the m-th step, and i be the road slope. S4. Calculate the transportation energy consumption in year n. In the formula, j is the total number of steps, t is the tonnage of the mine car, K1 is the average power consumption for round trip on flat ground, and K2 is the average power consumption for round trip uphill / downhill. S5. Calculate total transportation energy consumption. In the formula, p is the final year of the mining design, and the total cost is obtained by multiplying the total energy consumption by the electricity price.

2. The method for calculating the transportation cost of electric mining trucks in open-pit mines according to claim 1, characterized in that, In step S4, K1 represents the average power consumption for round-trip ore transport on a fully loaded and unloaded flat road, in kW·h / km; K2 represents the average power consumption for round-trip ore transport on a fully loaded uphill and unloaded downhill, in kW·h / km.

3. The method for calculating the transportation cost of electric mining trucks in open-pit mines according to claim 2, characterized in that, When the mine car is going downhill fully loaded or going uphill unloaded, K3 is used instead of K2, where K3 is the power consumption parameter for the corresponding working condition.

4. The method for calculating the transportation cost of electric mining trucks in open-pit mines according to claim 1, characterized in that, The calculation method for energy consumption in waste rock transportation is the same as that for ore transportation, except that the ore quantity Q is considered. n-m Replace with waste rock quantity q n-m And replace L0 with the distance L1 to the spoil heap.

5. The method for calculating the transportation cost of electric mining trucks in open-pit mines according to claim 1, characterized in that, Estimate the total costs of labor, tire consumption, auxiliary oil, maintenance and depreciation based on the actual consumption and management technology level of the mine. Then, add the estimated total costs to the calculated G to obtain the total cost of the mine transportation process.

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