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Figure 1 Vertical projection of the deep development system of Hongtoushan Copper Mine (Scheme 2)
1-large shaft; 2-cage well; 3-small shaft; 4-elevation well; 5-pipe well;
6-Waste stone slip well; C-industrial ore body; D-vision ore body; 1330-mine body number; F 5 - fault;
11301, 11302, 11307, 123001, 123002, 123003, 123004
The mine is located in Liaoning Province and was completed and put into operation in 1954. The actual output has reached 1600~2800t/d since production. It has been mined to 15 stages (to -46m) and has a depth of 816m.
The mine has formed a joint development of the Pingshuo shaft. +253m below the flat, open with a mixed shaft. The net diameter of the wellbore is 5.8m, and the lift is equipped with a 2.1m 3 double bucket, a single tank No. 5 and a counterweight. Buckets are used to lift ore, cages are used to lift waste rock, and transport personnel, equipment and materials.
The above system can only undertake lifting tasks of -467m or more. In order to mine the ore body below -467m, deep development is necessary, which is the key to solving the continuous production of the mine. According to the characteristics of the project, the design unit carried out two design preparations. The first is to cooperate with the mine geological department to find out the deep ore bodies; the second is to carry out rock mechanics work to study the impact of deep mining on the existing main and auxiliary wells. The design was officially launched after the above work was completed.
Whether the original shaft is stable during deep mining is a crucial issue in design. 1984 submitted a shaft stability studies HONGTOUSHAN copper mine. The report passed the investigation of the geological conditions of the mining area, the original rock stress measurement, the mechanical test, etc., and on the basis of obtaining a large amount of data, through the finite element analysis, the conclusion is that as long as the cement filling method is continued, the filling quality is guaranteed. There are main and auxiliary wells and the second auxiliary shaft is stable. After review and approval by relevant parties, existing wellbores can be used to save investment and speed up the construction of deep construction.
Under the premise of fully considering the connection between deep development and upper production, and ensuring that the deep shaft lifting capacity is 800t/d, four feasible solutions are proposed. After comparing the technical advantages and disadvantages, only the following two options are retained.
Option 1: The new digging blind bucket well, deepening the second section of the auxiliary well. That is, from the -407m stage to the -707m stage, the blind bucket well is cleaned with a net diameter of 3.5m. It is lifted with a 3.1m 3 bottom-loading single-hopper multi-rope, with JKM-2.25/4(1) type hoist, motor power. 320kw. After the ore is crushed, it is loaded into a bucket and lifted to an elevation of -429m to be discharged into the upper chute, which is connected with the upper lift. The second section of the blind auxiliary well extends from the -527m stage to the -727m stage and has a diameter of 4.0m. The waste rock, personnel and materials in the deep stage are all transferred by the transfer and main shaft.
Option 2: New digging blind cage wells and elevator shafts. That is, from the -407m stage, the blind cage well is drilled to -727m, the net diameter is 4.5m, and the single-layer double-tank No. 5 is lifted with JKM2.25/4(1) multi-rope hoist. The ore of each stage is upgraded from the 0.7m 3 mine car to the -467m stage through the tank cage, and the relay is improved with the upper main shaft. Elevator shafts are dived from -527m to -647m to transport personnel and materials. The comparison of the two schemes is shown in Table 1.
Table 1 Comparison of deep development plans
Comparison project
unit
plan 1
Scenario 2
Comparison of 1 and 2 schemes
Infrastructure construction
Of which: blind squatting
Blind tank cage
Auxiliary well deepening
Elevator shaft
Parking lot
Add equipment weight
Equipment installation capacity
Labor quota
Infrastructure investment
Of which: equipment
building
According to the deep annual mining of 240,000 tons of comparable
Operating fee
m 3
m 3
m 3
m 3
m 3
m 3
t
Kw
people
Ten thousand yuan
Ten thousand yuan
Ten thousand yuan
Ten thousand yuan / year
40038
10125
3094
20528
311
1282
82
881
113
620
twenty one
0.88
31844
6305
1623
17622
173
953
57
666
90
472
0
0
+8144
+3820
+1471
+2906
+138
+329
+25
+215
+23
+148
+21
0.88
As can be seen from the comparison, the scheme 1 has a high degree of mechanization and high efficiency. The system is single and reliable, and the production management is convenient, but the engineering volume is large and the investment is high. Although Scheme 2 has a small lifting capacity and a low degree of mechanization, the engineering volume and investment are small. Considering the tendency of the deep reserves of the mine to decrease, the production capacity may be reduced. After reviewing and agreeing to the second option, the second plan was appropriately adjusted. If the elevator shaft is not newly built, the second auxiliary shaft will be extended to reduce the amount of infrastructure construction and investment, so that the economic benefits of the enterprise will be better. The recommended scheme is shown in Figure 1.