Beneficiation plant utilizing waste (including recycling plant tailings back Yonghe Wing) has an important role in reducing environmental pollution, protect the ecological balance, but also saving Concentrator fundamental measure of the amount of fresh water. Industrial developed countries attach great importance to the reuse of industrial wastewater and continuously improve the reuse rate of industrial wastewater. The reuse rate of wastewater in China's concentrator has been significantly improved since the 1980s. However, non-ferrous metal mine concentrator wastewater reuse rate is generally lower than iron ore dressing plant. In particular, the reuse rate of wastewater from small and medium-sized concentrators is very low, and some concentrators are not completely reused at all. Huili Zinc Mine is one of them. I. Overview The Huili Zinc Mine Concentrator is an old factory with a production history of nearly 30 years. Production of lead concentrates, zinc concentrates (previously also produced lead-zinc mixed concentrates). The processing capacity has grown from the initial 200t/d to 1000t/d, and the current processing capacity is around 800t/d. Once upon a time. Due to lack of understanding of environmental protection and geographical restrictions, there is no tailings pond. Before 1990, tailings were directly discharged into the Anning River without treatment, causing serious pollution. After reconstruction and expansion, a storage capacity of 2.85 million was built. The tailings pond of m 3 currently has a daily water consumption of about 6000t and a tail discharge of 4000t. Concentrator agents used are black powder, xanthate, No. 2 oil, copper sulfate, zinc sulfate, sodium sulfide, lime and the like. Some of the remaining pharmacy flows into the tailings pond with the tailings, and the tailings are clarified forever and then discharged into the Anning River. No return water use. In recent years, due to the increasing emphasis on water resources and environmental protection, the use of recycled water is an effective method for many concentrators to save energy and reduce pollution. At present, as far as the mine is concerned, the recycling of ore dressing wastewater can reduce the cost of water withdrawal on the one hand and reduce the wastewater discharge of 40000t on the other hand. Great benefit to the environment. The use of mineral processing wastewater requires a series of technical problems, such as the technical cooperation of the return water and the beneficiation process, and the determination of the location of the water intake point. More importantly, the use of wastewater does not affect the mineral processing technical indicators. Second, the recycling test of mineral processing wastewater (1) Determination of mineral processing test methods and water return schemes The feasibility of wastewater reuse is measured by a comprehensive comparison between the beneficiation index of new water (current production water) and the clarified beneficiation wastewater beneficiation index. In order to make the test results comparable, the beneficiation test was first carried out with new water, and better conditions were obtained. Under this condition, the wastewater beneficiation test was carried out. Compare the selection criteria for the two water qualities. The tailings reservoir not only enables the natural purification of the wastewater, but also makes the water flow tend to be in equilibrium. The tailings pond is stable in water quality. The large amount of water is conducive to beneficiation and reuse, and the water is used for ore dressing test. The indicators obtained are ideal and the process is stable. Therefore, it is a good solution to return the overflow water from the tailings pond. Other schemes such as sub-system and sub-site return have problems such as complicated water quality, unstable water volume, many pipelines, and inconvenient management. Therefore, the location of overflow water in the tailings pond is selected as the final water intake point. (II) Monitoring indicators of ore dressing wastewater From the analysis results of the overflow water in the tailings reservoir (see Table 1), it can be seen that although the overflow water of the zinc mine tailings reservoir meets the national new emission standards. However, it still contains a certain amount of harmful substances, and the recycling of tail water is beneficial to protect the environment. (3) Test of new water In the test, the new water was taken from the production water, and the test ore was taken from the middle or middle part of the ore (not being ore blended). The test procedure is close to the current production process. On this basis, sodium sulfide, BK-306, No. 2 oil, and zinc sulfate are respectively used. The dosages of copper sulfate and butyl sulphate were tested and the optimal flotation conditions of the ore were obtained. The pH value was selected according to the test results of the Beijing Research Institute of Mining and Metallurgy. The specific process, dosing point and dosage. see picture 1. The lead-selection cycle adopted in the field is a rough selection, two sweeps, and lead-zinc separation after de-sludge of coarse concentrate; the lead-zinc separation uses one rough selection, two sweeps, and five selections. The zinc selection cycle uses one rough selection, two sweeps, two selections, and the middle mine returns one by one. The test procedure is quite different from this, because the purpose of the test is to compare the effects of new water and water, and a simple process can achieve this. (4) Test results Using the process shown in Figure 1, a small closed-circuit test was performed with fresh water and tailings reservoir overflow water, respectively. The test results are shown in Table 2. It can be seen from the test results in Table 2 that the quality of lead concentrate and zinc concentrate produced by using two kinds of water flotation can meet the requirements. The zinc recovery rate is also basically the same. Only lead recovery is 1% lower, the test index is ideal, and the dosage is determined according to other mine experience based on the optimal dosage of new water. With the use of ore dressing wastewater, the dosage can be saved by about 15%. Third, the feasibility and economic benefits of return water use Judging from the location of the Huili zinc mine tailings pond, only one primary pumping station can meet the needs of water use, and now the new water must pass through the two-stage pumping station to arrive at the plant. The existing water intake pipeline passes through the tailings pond, which provides convenience for the future use of the ore dressing wastewater. It is only necessary to increase the water intake equipment and some pipelines to take water from the tailings pond, which can save a large part of the water intake cost. The water withdrawal cost of new water and backwater is shown in Table 3. It can be seen from Table 3 that after using the wastewater, only one water fee can be saved in the whole year, which can save more than 300,000 yuan, if the drug is saved and the environment is protected. The benefits are even more significant. Fourth, the conclusion (1) Test certificate. The return water has little effect on the selection index of the zinc mine, which is similar to the selection of the new water, which indicates that it is feasible to use the backwater in large quantities. (II) Through research on the recovery and utilization of ore dressing wastewater, it can be proved that the recycling of ore dressing wastewater can save 1.3 million m 3 of new water every year, reduce the water intake cost by more than 300,000 yuan, and reduce the discharge of wastewater. It has certain economic benefits and good environmental benefits. Others Series Products
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