Samples and test methods of polyacrylamide used in lead-zinc mines, 1 Coagulation test samples, including test waste water samples and test ore samples. The test wastewater sample is a comprehensive wastewater sample from the processing plant, taken from the ultra-high molecular weight polyethylene tailings pipeline leading to the tailings pond. The wastewater quality: pH 11.69, CODCr value 493.65mg/L, Pb2+ concentration 31.81mg /l, strong foaming. The test sample contained 0.92% lead, 2.73% zinc, 7.17% iron, 8.86% sulfur, 0.0018% copper, and 0.22% arsenic. The test method is to take 500ml of waste water and conduct a coagulation test on a magnetic stirrer. After adding the coagulant, stir at 300r/min for 3min, then at 100r/min for 5min, and finally stand still for 22min. Observe the change of the water sample, take a water sample 2cm below the liquid surface to measure its CODCr value and heavy metal ion content. 2 Adsorption test, from the results of the coagulation test, after coagulation and sedimentation, the metal ion content in the wastewater is already very low, but the CODCR value of the wastewater is still high, that is, there are still flotation reagents in the wastewater, so it must be removed Residual flotation reagents to reduce the influence of residual flotation reagents on the flotation index when wastewater is reused. In this experiment, activated carbon was used to reduce the CODcr value in wastewater by adsorption and sedimentation, and powdered activated carbon was used in the experiment. Activated carbon dosage test selects the waste water treated when the PAC dosage is 40mg/l under natural pH conditions, Lead-zinc mine polyacrylamide.
Test results: Compared with clean water, the flotation index of untreated wastewater is higher in zinc content in crude lead concentrate, while the wastewater after coagulation and sedimentation-activated carbon adsorption treatment has better flotation indexes, which is better than clean water flotation. The indicators are comparable. Therefore, coagulation sedimentation-activated carbon adsorption is the best treatment method.
The wastewater reuse test showed that the flotation index of reuse after the coagulation sedimentation-activated carbon adsorption process was used to treat the mineral processing wastewater was close to that of clean water, indicating that the wastewater treated by this process could be used in the flotation production of the plant.
How should lead-zinc mines treat wastewater? Here is an example of a lead-zinc mine wastewater treatment device that uses chelation, flocculation and precipitation processes to treat lead-zinc mine tailings wastewater. The system includes a chelating reaction tank, a mixing reaction tank and a sedimentation tank connected by pipelines. The process system of the utility model has simple processing flow, low processing cost, simple operation, and can effectively reduce the impact of lead-zinc mine tailings wastewater on the ecological environment. Aiming at the characteristics of the pollutants in the lead-zinc beneficiation wastewater, the processing method is usually adopted There are: physical methods, such as precipitation, flotation, filtration, blowing off, etc.; chemical methods, such as neutralization, redox, adsorption, etc.; biochemical methods, such as aerobic biochemical treatment, anaerobic biochemical treatment, etc.
The heavy metal elements in the mineral processing wastewater mostly exist in the form of solid matter, and the method of physical precipitation can generally be adopted to avoid heavy metal pollution. Due to the different ore properties and flotation process requirements, the pH value of the slurry varies greatly. The pH value of the lead-zinc flotation slurry is generally alkaline. When the pH value of the slurry is weakly alkaline, the heavy metal ions in the tailings water are precipitated in the form of hydroxide, which generally does not exceed the standard. When the pyrite content in the raw ore is high, the large amount of lime added in the flotation causes the pH of the slurry to reach 12 or even higher. Because the heavy metal hydroxide is an amphoteric hydroxide, as the pH value increases, the solubility becomes It also increases, causing heavy metal ions in the tailings water to exceed the standard, sometimes exceeding the standard several hundred times. In order to solve this technical problem, the following technical scheme can be adopted: a lead-zinc mine wastewater treatment device, which is characterized by a chelating reaction tank, Lead-zinc mine polyacrylamide, The mixing reaction tank and the sedimentation tank are connected by pipelines and valves in sequence. Among them, there is a metering pump A on the connecting pipeline before the chelation reaction tank, the metering pump A is connected to the urea solution tank, and a stirrer A is provided in the chelation reaction tank. The connecting pipeline between the chelating reaction tank and the mixing reaction tank is equipped with a metering pump B, which is connected to the polyaluminum sulfate solution tank, and a stirrer B is provided in the mixing reaction tank.