摘要
针对煤泥水在处理过程中普遍存在的沉降效果不佳,导致循环水系统浓度偏高的问题,以赵庄煤业选煤厂浓缩机入料煤泥水(D50为26.61μm,微细粒颗粒质量分数高,难以沉降)为研究对象,以上清液透射比、初始沉降速度和压缩层厚度作为絮凝沉降的评价标准,结合Zeta电位与聚焦光束反射测量仪(FBRM)等方法测试,研究阳离子型聚丙烯酰胺(CPAM)、阴离子型聚丙烯酰胺(APAM)、非离子型聚丙烯酰胺(NPAM)单独及与聚合氯化铝(PAC)复配对煤泥水沉降的影响。研究结果表明:PAC作为一种无机高分子凝聚剂,其水解产物具有较强的吸附架桥作用,能够与CPAM产生协同效应,复配药剂显著增强煤泥颗粒的聚集能力;在PAC的用量为50 g/t时,沉降速度为75.38 cm/min,较单独使用CPAM提升了6.7 cm/min;压缩层厚度降低至4.5 cm,透射比也提高至96.2%,通过FBRM测试得到复配药剂作用下的絮体尺寸显著增大。因此,采用PAC与CPAM进行复配絮凝沉降效果最好,通过电中和与架桥协同解决沉降难题,可为选煤厂煤泥水处理提供理论与实践支撑。
Aiming at the widespread issue of poor sedimentation in coal slurry water treatment leading to high concentration in the circulating water system,this study takes the feed coal slurry water(with D50 of 26.61µm.high fine particle mass fraction,and difficult sedimentation)from the thickener at Zhaozhuang Coal Preparation Plant as the research subject.Using supernatant transmittance,initial sedimentation rate,and compressed layer thickness as the evaluation criteria for flocculation sedimentation,and combining methods such as Zeta potential and Focused Beam Reflectance Measurement(FBRM),the effects of cationic polyacrylamide(CPAM),anionic polyacrylamide(APAM),nonionic polyacrylamide(NPAM)alone and their combination with polyaluminum chloride(PAC)on coal slurry water sedimentation were investigated.The results show that PAC,as an inorganic polymer coagulant,possesses hydrolysis products with strong adsorption and bridging effects,which synergize with CPAM to significantly enhance the aggregation capacity of coal slurry particles.When PAC dosage is 50 g/t,the sedimentation rate reaches 75.38 cm/min,an increase of 6.7 cm/min compared to using CPAM alone;the compressed layer thickness decreases to 4.5 cm,and the transmittance improves to 96.2%.FBRM tests indicate that the floc size under the combined action of PAC and CPAM increases significantly.Therefore,the combination of PAC and CPAM achieves the best flocculation sedimentation effect,addressing sedimentation challenges through charge neutralization and bridging synergy.This study provides theoretical and practical support for coal slurry water treatment in coal preparation plants.
作者
徐东方
许彬彬
常进军
甄晋强
马晓敏
张辰
王健
XU Dongfang;XU Binbin;CHANG Jinjun;ZHEN Jinqiang;MA Xiaomin;ZHANG Chen;WANG Jian(Zhaozhuang Coal Industry Co.Ltd.Coal Preparation Plant,Shanxi Jincheng Anthracite Mining Group,Changzhi 046605,China;Sihe No.2 Coal Mine,Jinneng Holding Equipment Manufacturing Group Co.Ltd.,Jincheng 048017,China;College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Jincheng Anthracite Mining Group Technology Research Institute Co.Ltd.,Jincheng 048000,China)
出处
《选煤技术》
2025年第4期25-31,共7页
Coal Preparation Technology
基金
国家重点研发计划项目(2023YFC2907704)
山西省自然科学基金面上项目(202403021221068)。
关键词
煤泥水处理
絮凝沉降药剂
聚丙烯酰胺
聚合氯化铝
沉降速度
压缩层厚度
ZETA电位
絮体尺寸
coal slurry water treatment
flocculation and sedimentation reagents
polyacrylamide(PAM)
polyaluminum chloride(PAC)
settling velocity
compressed layer thickness
Zeta potential
floc size
