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含细颗粒悬浮物矿井水的混凝沉淀参数优化

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  • 国家科技期刊平台
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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 50 mg/L,非离子型聚丙烯酰胺(NPAM)投加量 5.0 mg/L,快速搅拌(300 r/min)时间 1 min,慢速搅拌(50 r/min)时间8 min,静置时间5 min;在最佳工艺条件下,悬浮物(SS)质量浓度为5.0 mg/L,去除率为99.1%,相比单独投加PAC时,10 μm以下的细颗粒物去除率提高了25.9%,矿井水的ζ电位由-40.9 mV降低至-16.3 mV,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.
Parameter optimization of coagulation and sedimentation for fine suspended solids removal from mine water
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.

mine waterfine particlessuspended mattercoagulation and precipitationparameter opti-mizationζ potentialcoagulation mechanism

侯嫔、秦浩铭、刘昊、徐东莹、贾舒涵、张周爱、王建兵

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中国矿业大学(北京)化学与环境工程学院,北京 100013

神华宝日希勒能源有限公司,内蒙古呼伦贝尔 021025

矿井水 细颗粒 悬浮物 混凝沉淀 参数优化 ζ电位 混凝机理

山西省重点研发计划中央高校越崎青年学者资助计划国家重点研发计划神华宝日希勒能源有限公司研究项目

2021020903010062020QN092018YFC0406404-5CSIEZC190104242

2024

10.19606/j.cnki.jmst.2024.02.014

矿业科学学报
中国矿业大学（北京）

矿业科学学报

CSTPCD北大核心
ISSN：2096-2193
年,卷(期)：2024.9(2)
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