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Dexing Copper Mine, the backbone mine of Jiangxi Copper Group, is one of the world's major porphyry copper mines and China's largest open-pit nonferrous metal mine. It has proven copper ore reserves of 1.63 billion tons, 1.32 billion tons of which are currently in reserve, and the amount of copper metal exceeds 5 million tons. The drainage system of Dexing Copper Mine adopts a two-stage mode, draining water from the negative 130-meter pump room to the negative 10-meter reservoir, and then to the external reservoir. The two pump rooms are not linked, the equipment is outdated, the degree of automation is low, and the operation depends on experience. The system operation is complicated, the electricity bill is high, and the safety performance is low. In order to reduce costs and improve efficiency, it is necessary to transform it into an intelligent drainage system to realize automatic control of pump start and stop, balance operation time, optimize drainage time, reduce electricity bills, and reduce operator labor intensity and the risk of misoperation.

Process requirements and control solutions The newly added control system of Dexing Copper Mine monitors the 6 high-voltage motors, 4 split pumps, 2 vacuum pumps, 14 electric ball valves, 20 electric actuators, 24 pressures, 4 flows, 3 liquid levels and auxiliary power equipment of the -10m pump station, and is linked with the -130m pump station for control. The Lanpufeng PLC collects data in real time, starts and stops related equipment manually or automatically through the host computer, realizes unattended operation, and automatically generates operation reports.