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利用臭氧氧化技术对铅锌硫化矿浮选过程各单元作业废水及尾矿库外排水进行处理,根据硫酸根离子浓度增量计算废水中低价态硫(价态小于+6)浓度.采用吹扫捕集-气相色谱质谱联用仪(PTC-GC/MS)检测浮选药剂(丁基二硫代碳酸钠(n-BX)、二乙基二硫代氨基甲酸钠(DDTC)、腐殖酸钠(SH)、松醇油)水溶液的自然降解产物、尾矿库进水及外排水中的挥发性有机硫化物(VOSCs).结果表明,尾矿库主要进水水源中低价态硫浓度为112 mg·L-1,其中,二硫化碳(CS2)在检测组分中所占相对比例为35.60%,是主要的VOSCs物质.各单元作业中浮选作业工段加入大量浮选药剂,浮选药剂水溶液自然降解产物中均检出CS2,而用药量最大的n-BX(C5H9Na OS2)自然降解产物中CS2相对比例最高(80.33%),因此,n-BX是浮选废水中VOSCs主要药剂来源.尾矿库外排水中低价态硫浓度为22 mg·L-1,其中,VOSCs物质主要有3,6-二甲基-1,2,4,5-四硫环己烷(C2H4S4)、N-巯基-甲酰胺(CH2SNO)和2-甲基-3-噻唑啉(C4H7NS),尾矿库外排水中C2H4S4所占相对比例为22.59%,是主要VOSCs物质.尾矿库水体中微生物通过消耗CS2生成C2H4S4进行新陈代谢.本研究结果可为铅锌硫化矿浮选工艺改进和安全排放提供参考.
Ozone oxidation technology is used to treat the effluent from each unit of the flotation process of lead-zinc sulphide flotation and the drainage outside the tailings pond, and the concentration of sulfur in the waste water (valence less than +6) is calculated according to the increment of the sulfate ion concentration. (N-BX), sodium diethyldithiocarbamate (DDTC), humic acid (n-butyldithiocarbamate) (SH) and pine spirit, and the volatile organic sulfides (VOSCs) in the effluent from the tailing pond and the effluent from the tailings pond.The results showed that the low sulfur content Was 112 mg · L-1, of which carbon dioxide (CS2) accounted for 35.60% of the total components in the test, which was the main VOSCs material.Using a large amount of flotation reagents and flotation reagents CS2 was detected in natural degradation products of aqueous solution, while n-BX was the main source of VOSCs in flotation wastewater. However, n-BX was the highest proportion of natural degradation products of n-BX (C5H9Na OS2) with the highest dosage of CS2 (80.33%). The low-cost sulfur concentration in the effluent from the tailings pond is 22 mg · L-1, of which, the main VOSCs are 3,6-dimethyl-1,2,4,5- (C2H4S4), N-mercapto-formamide (CH2SNO) and 2-methyl-3-thiazoline (C4H7NS). The relative proportion of C2H4S4 in the effluent from the tailing pond was 22.59%, which was the main VOSCs The microorganisms in the tailings water body can metabolize C2H4S4 by consuming CS2.The results of this study can provide reference for the improvement and safe discharge of lead-zinc sulfide ore flotation process.