超细粒级浸出渣絮凝沉降特性试验研究

第38卷第2期矿冶工程V〇1.38A22018年04月MININGANDMETALLURGICALENGINEERINGMININGANDMETALLURGICALENGINEERINGApril2018超细粒级浸出渣絮凝沉降特性试验研究$史秀志，陈飞，卢二伟，杨超，周健(中南大学资源与安全工程学院，湖南长沙410083)摘要：为探究超细粒级浸出渣的沉降规律，获取浸出渣最佳絮凝沉降条件，首先对超细粒级浸出渣进行了自然沉降试验，然后以非离子型聚丙烯酰胺为絮凝剂，对质量浓度为15%的浸出渣浆液进行了絮凝沉降试验。通过均匀设计试验，探究尾砂浓度、絮凝剂单耗、絮凝剂浓度对浸出渣絮凝沉降的影响。在约束条件下，对试验数据进行回归分析，结果表明，超细粒级浸出渣沉降缓慢，沉降速度与尾砂浓度成反比;当非离子型聚丙烯酰胺分子质量为1200万时，絮凝沉降速度最快;各因素影响絮凝沉降效果的强弱顺序为:尾砂浓度>絮凝剂浓度>絮凝剂单耗;当尾砂浓度5%、絮凝剂浓度0.30%、絮凝剂单耗35&/t时，絮凝沉降效果较好。关键词：井下充填；超细粒级浸出渣；絮凝沉降；聚丙烯酰胺；均匀设计试验；回归分析中图分类号：TD853文献标识码：Adoi:10.3969/j.iwn.0253-6099.2018.02.001文章编号：0253-6099(2018)02-0001-05ExperimentalStudyonSedimentationCharacteristicsofUltrafineLeachResidueafterFlocculationSHIXiu-zhi，CHENFei，LUEr-wei，YANGChao,ZHOUJian(SchoolofResourcesandSafetyEngineering，CentralSouthUniversity，Changsha410083，Hunan，China)Abstract：Inordertoexplorethesedimentationruleoltheleachresidueaswellasobtainoptimumconditionslorflocculatingsedimentationoltheleachresidue，testwasfirstlyconductedonthenaturalsedimentationolleachresidue，andthentheflocculatingsedimentationolleachresidueslurrywiththemassconcentrationol15%wastestedbyusingnonionicpolyacrylamideasaflocculant.Basedontheuniformdesignexperiment，effectsoftailingsconcentration，unitconsumptionandconcentrationolflocculantontheflocculatingsedimentationolleachresiduewerealldiscussed.Aregressionanalysislortestresultswiththeconstraintconditionshowedthattheultralineleachresiduesettledslowly，withthesettlingvelocityinverselyproportionaltotheconcentrationoltailings.Thenonionicpolyacrylamidewithmolecularweightol12millionledtothebestflocculationeffect.Andeachfactorsbroughtanimpactonthesedimentationeffectalterflocculationinthefollowingdescendingorder：tailingsconcentration>flocculantconcentration>unitconsumptionolflocculant.Itisshownthatwiththetailingsconcentrationat5%，anadditionolflocculantattheconcentrationol0.30%bytheunitconsumptionol35g/tcanleadtoanoptimalflocculationeffect.Keywords：undergroundfilling；ultralineleachresidue;flocculatingsedimentation；polyacrylamide;uniform