School of Chemical and Environmental Engineering,China University of Mining and Technology-Beijing
Shenhuabao Rixile Energy Co,LTD

针对宝日希勒露天煤矿矿井水中悬浮颗粒物粒径小、难去除的问题,采用单因素与正交实验方法确定了混凝沉淀工艺的最佳参数,分析了矿井水中细颗粒物的混凝机理。结果表明,混凝沉淀的最佳工艺参数为聚合氯化铝(PAC)投加量50mg/L,非离子型聚丙烯酰胺(NPAM)投加量5.0mg/L,快速搅拌(300r/min)时间1min,慢速搅拌(50r/min)时间8min,静置时间5min;在最佳工艺条件下,悬浮物(SS)质量浓度为5.0mg/L,去除率为99.1%,相比单独投加PAC时,10μm以下的细颗粒物去除率提高了25.9%,矿井水的ζ电位由-40.9mV降低至-16.3mV,说明细颗粒物的混凝机理主要为PAC吸附电中和作用和聚丙烯酰胺(PAM)吸附架桥作用。

In response to the issue of small particle size and difficult removal of suspended particles in the mine water of Baorixile open-pit coal mine,this study probed into the optimal parameters of the co agulation and precipitation process through single-factor and orthogonal experiments,and explored the mechanism behind the coagulation of fine particles in mine water. The optimal process parameters for coagulation and precipitation include:50 mg / L of polyaluminum chloride (PAC),5. 0 mg / L of non-i onic polyacrylamide (NPAM) under 1 minute of rapid stirring (300 r/ min),8 minutes of slow stirring (50 r/ min),and 5 minutes of settling. Under these optimum process conditions,the concentration of suspended solids (SS) is 5. 0 mg / L with a removal efficiency of 99. 1% . Compared to the sole addition of PAC,the removal efficiency of fine particles below 10 μm increased by 25. 9% . Additionally,theζpo tential of the mine water decreased from -40. 9 mV to -16. 3 mV,indicating that the coagulation mech anism of fine particles is mainly attributed to the adsorption and charge neutralization of PAC and the bridging effect of PAM.

山西省重点研发计划(202102090301006);中央高校越崎青年学者“资助计划”(2020QN09);国家重点研发计划(2018YFC0406404-5);神华宝日希勒能源有限公司研究项目(CSIEZC190104242)

侯嫔,秦浩铭,刘昊,等.含细颗粒悬浮物矿井水的混凝沉淀参数优化[J].矿业科学学报,2024,9(2):278-285.

HOU Pin,QIN Haoming,LIU Hao,et al. Parameter optimization of coagulation and sedimentation for fine suspended solids removal from mine water[J]. Journal of Mining Science and Technology,2024,9(2):278-285.