The tailings water is reused and the proportion of wastewater circulation is increased as much as possible to achieve closed loop. This is the focus of current domestic and international wastewater treatment technologies. Partial efflux is only possible if the closed loop is not possible. After the tailings wastewater is purified and treated, it can be reused and reused, which can solve the water source, reduce power consumption, and solve the problem of environmental pollution. According to reports, the United States has six mineral processing plant wastewater reuse rate of 95%. The tailings backwater generally has the following methods: 1. The backwater of the concentration tank is generally low due to the concentration of tailings discharged from the ore dressing plant. To save new water consumption, the tailings concentration tank is often built in the ore dressing plant or near the ore dressing plant. Or the backwatering facilities such as the sloping plate concentration tank are used for dehydration of the tailings. The tailings sand is deposited at the bottom of the concentration tank, and the clarified water overflows from the pool and is sent back to the concentrator for reuse. The return water rate of the concentration tank is generally above 40% to 70%. Large-scale concentrating plants or gravity concentrating plants use concentrated pools to return water. On the one hand, they can obtain a large amount of backwater in the concentrating tanks, reducing the burden of water supply sources; on the other hand, the tailings slurry volume is reduced due to the increase of tailings concentration. Small, so it can reduce the transportation cost of tailings. Second, the tailings reservoir backwater After the tailings are discharged into the tailings pond, part of the water content in the tailings slurry remains in the gap of the sedimentary tailings, part of which penetrates into the pool through the bottom of the dam body, and the other part is in the pool. The surface evaporates. The backwater from the tailings pond is to recover the remaining part of the clarified water for use by the concentrator. Since the tailings pond itself has a certain catchment area, the tailings pond itself plays a role in regulating the runoff water. The basic forms commonly used in tailings reservoir drainage systems are: drain pipes, tunnels, spillways and hillside intercepting ditch. The required drainage system should be determined after technical and economic comparison based on factors such as displacement, topographical conditions, use requirements and construction conditions. Drainage drainage is used for small flows; drains or tunnels can be used for medium flow, and tunnels or spillways are used for large flows. The inlet head of the drainage system may be a drainage well or a chute. For large and medium-sized projects, if engineering geological conditions permit, tunnel flood discharge is often economical and reliable compared to drain discharge. Domestic tailings ponds generally use flood drainage systems for flooding and tailings clarification. The drainage system of the tailings pond should be arranged on the side of the tailings side of the tailings. The line selection is short and straight, the foundation is uniform, and there are no faults, landslides, fracture zones and weak foundations. The head of the inlet should be arranged to meet the requirements of entering the tailings clarified water at any time during use. When the influent facility is a drainage well, the quantity, elevation, distance and location should be carefully considered. For example, the first well (the lowest position) can meet the requirements of the clarification distance in the initial use, and can also meet the clarification water supply as soon as possible. The requirements of the concentrator use, the remaining well positions are gradually raised, and each wellbore has a certain height overlap (overlap height △h = 0.5 ~ 1.0m), the figure has been shown. The purpose of clarifying the distance is to ensure that the drainage well does not run over the water. When the tailings receive a large area of ​​water, a large amount of flooding may occur in a short period of time. In order to quickly discharge most or part of the flood, a spillway is built near the tailings dam on the side of the tailings pond. All drainage well windows, pipe diameters, groove sections, tunnel sections and other sizes and discharge flows through the drainage system facilities shall be calculated and then combined with actual experience to determine. Fig.1 Schematic diagram of longitudinal section of tailings pond 1-initial dam; 2-stacking dam; 3-drainage pipe; 4-first drainage well; 5-subsequent drainage well; 6-tailing sedimentary beach; 7-filter layer; 8-protective layer; 9-drainage; 10-observation facility; 11-dam slope drainage ditch; 12-tailing pond tailings pond return rate is generally up to 50%. If the water source in the mining area is insufficient, the tailings reservoir has a large water collection area, and there are good engineering geological conditions (such as geological structures without serious leakage such as caves and faults), the return water rate can be as high as 70% to 80%. The advantage of backwater from the tailings pond is that the water quality of the backwater is good, and some of the rainwater runoff is regulated in the tailings pond, so the amount of backwater sometimes increases. The disadvantage is that the return water pipeline is long and the power consumption is large. Third, the use of backwater in the sedimentation tank backwater sedimentation tank is generally only applicable to small ore dressing plants. Due to the tailings sand deposited at the bottom of the pool, it needs to be cleaned frequently and it takes a lot of manpower. Therefore, when the production scale of the concentrator is large and the production period is long, it is not suitable to use the sedimentation tank backwater. Fourth, the use of a copper for a Copper Ore backwater typical case the amount of waste generated daily is about 30,000 tons, acidic, and contains heavy metal ions, resulting in a large mining area polluted river dock. To this end, the mine will use part of the wastewater for the leaching of copper from the waste rock field, recover the waste copper and copper metal, and maximize the use of copper resources. Part of the wastewater is discharged into the tailings pond, and after clarification with the alkaline water in the reservoir, it is returned to beneficiation as production water. The remaining wastewater is treated by the treatment station and reaches the national discharge standard and discharged into the river. The discharged water quality meets the standard of surface water. At present, the reuse rate of the refinery's return water is 76.4%.
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