A mining company Hechi tin reselection method is employed to achieve separation and clay minerals, rocks and other impurities, where the ore rock since not the same, resulting in the changing of the wastewater discharged from the washing process. Mineral processing wastewater is the main source of emission pollution in the mining industry. It has the characteristics of large water volume and high suspended solid content. After the company's wastewater is naturally settled by the tailings pond, the overflow water is discharged directly into the nearby river. The discharged wastewater is insufficiently sedimented, the sediment content is large, the suspended matter content is high, and the appearance is dark brown and turbid. The wastewater quality: COD is 100-400mg/L, SS is l100-8000Hlg/L, turbidity is 2500-4000NTU, pH=7.0-8.0, water volume is 2000-3000m 3 /d, main pollutant is suspended matter, direct discharge Cause environmental pollution. Research content: Select high-efficiency flocculant to find the best coagulation conditions suitable for the treatment of the beneficiation wastewater, including the control of coagulant dosage and pH value, and provide relevant parameters selection, design reference and design for the wastewater treatment project. Guide production operations.

First, experimental reagents and instruments

Reagents: polyaluminum chloride (PAC), FeCl 3 • 6H 2 O (FC), poly ferric sulfate (PFS), poly aluminum silicate (PSA), prepared at a concentration (mass fraction) were 5%; 5% Ca (OH) 2 , solution; polyacrylamide (anionic, molecular weight 8 million), mass fraction 0.1%. Instrument: PHS-3C pH meter, JJ4-six electric agitator, HACH2100AN turbidity meter.

Second, the experimental method

Use 5 500HLJ beakers, put 300mL of raw water separately, add a certain amount of flocculant, put it on the mixer platform, stir quickly, then stir slowly, the stirring intensity is 100r/min and 50r/min respectively, stirring time Each is lmin, the fine particles of the wastewater and the colloidal substance are thoroughly mixed and reacted to form a floc, which is allowed to stand for 15 minutes. The supernatant in the beaker is extracted with a 100 mL syringe (23 cm below the liquid surface, the volume is about 40 mL), and the turbidity is measured. Measured 3 times to average).

Third, the main test indicator for evaluating the coagulation effect is turbidity

The process of coagulation is a complex physicochemical process in which the coagulant interacts with fine suspended particles and colloids in the water. This process is restricted by many factors, including: the type and nature of the coagulant, the amount of coagulant, the combination of inorganic and organic coagulant, the pH value of the solution, the stirring strength and the settling time.

Fourth, the conclusion

It is proved by experiments that FC is most suitable for the treatment of the beneficiation wastewater, and factors affecting the treatment effect of FC are studied. The optimum treatment conditions are as follows: 300 mL of wastewater is treated, the pH is controlled to 8.0, the amount of FC (mass fraction 5%) is 0.40 mL, and the amount of PAM (mass fraction 0.1%) is 0.20 mL. The stirring strength is first The rotation speed is 100r/min, then the rotation speed is 50r/rain, the stirring time is 1min each, the sedimentation time is 15min, the clear liquid pH is 7.03, and the turbidity is reduced to below 2.0NTU.

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