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During the production process of sulfide lead-zinc ore using the flotation method, a large amount of beneficiation wastewater is generated. The pH value, suspended solids, chemical oxygen demand, heavy metal ions, etc. in the beneficiation wastewater often exceed the water quality standard limits. Direct discharge of mineral processing wastewater will disturb the water environment in the mining and surrounding areas. Direct reuse will cause fluctuations and deterioration of mineral processing production indicators. Therefore, lead-zinc mining production enterprises must treat mineral processing wastewater and discharge it in compliance with standards or recycle it back to the mineral processing plant for production use. Taking Dongtangzi Lead Zinc Mine in Feng County, Shaanxi Province as an example, this paper elaborates on the method of fully recycling mineral processing wastewater and the achieved results. In order to reduce the impact of mineral processing wastewater on production and mineral processing indicators, the circulation volume and water quality of mineral processing wastewater were analyzed and monitored, and the reasons affecting mineral processing production were identified. Through research and investigation, a wastewater treatment process suitable for the company was designed. By continuously adjusting and optimizing the mineral processing agent system (including changing the lime dosing point and reducing the lime dosage, using Z-1 flotation agent, MB collector, and BK204 frother reducing, the dosage of copper sulfate and ethyl sulfide nitrogen, and discontinuing the use of Na2SO3 K2Cr2O6, Na2CO3, ZnSO4, xanthate, terpineol oil and other reagents, the total amount of mineral processing reagents hasbeen reduced from 13 295 g/t to 6 500 g/t, with a reduction by 6 795 g/t and a decrease of 51%. At the same time, the flocculation effect of lime and Z-1 flotation agent, as well as the inhibitory effect of Z-1 flotation agent on heavy metals and carbon-containing substances, purify the flotation operation environment, enabling wastewater treatment and mineral processing operations to be carried out simultaneously in the production process, eliminating the impact of fully recycled mineral processing wastewater on production. Mineral processing wastewater only needs to be naturally settled in the tailings pond and can be fully recycled for mineral processing production without the specific wastewater treatment, achieving full recycling of mineral processing wastewater. The dosage and cost of reagents are significantly reduced, and the mineral processing indicators are significantly improved. The results can provide a reference for the recycling of similar lead-zinc ore beneficiation wastewater. [ABSTRACT FROM AUTHOR]

Due to the different concentration and high salinity of salt in salt lake brine, it is difficult to determine accurately by conventional analysis methods. By investigating the addition amount of cation exchange resin, the exchange time of cation exchange resin, the influence of pH value on exchange efficiency, and the correction of internal standard elements, the determination of metasilicate in salt lake brine by cation exchange resin separation and inductively coupled plasma emission spectrometry was established. In this method, salt lake brine is diluted five times, 6 g cation exchange resin is added, and the static exchange is 1. 5 h. After removing a large number of cations in the brine, Si 251. 611 nm is selected as the analytical spectral line, and Y 371. 030 nm spectral line is used as the internal standard for signal drift correction. The content of metasilicic acid in the brine is determined by inductively coupled plasma emission spectrometer. The calibration curve is tested under the optimum conditions, and the linear range of the calibration curve is 0. 50--200 mg/L, and the linear relationship of the regression equation obtained is good (rj^ 0. 9994). The detection limit of this method is 0. 16 mg/L, the relative standard deviation (RSD, w = 12) is 1. 8%--4. 6%, and the recovery of standard addition is 96. 3%--102%. At the same time, UV-visible spectrophotometry is used to compare the content of metasilicic acid, and there is no significant difference between the two test results, indicating that the method has good accuracy. Through this method, the content of metasilicic acid in salt lake brine can be determined quickly and accurately, providing reliable data support for improving the comprehensive utilization of salt lake resources. [ABSTRACT FROM AUTHOR]