120万吨炼焦煤选煤厂设计

摘要本设计选煤厂为年处理能力120万吨矿区型炼焦煤选煤厂。入选原煤属于较难选煤。通过对煤质资料进行充分的分析，最终确定选煤工艺流程为预先脱泥-无压三产品重介旋流器、浮选联合分选流程。入选原煤选前脱泥，脱泥后0.5-50.0mm粒级煤采用重介旋流器分选，-0.5mm煤泥采用浓缩浮选的工艺流程。原煤经分选后，其最终精煤产率为72.04%，，灰分为9.47%，水分为10.44%；中煤产率为18.99%，灰分为27.86%；矸石产率为8.97%，灰分为72.86%；以上指标均达到设计的要求。本流程采用了预先脱泥，提高了无压三产品重介旋流器分选精度和效率，并且提高了介质的回收；浮选精煤、尾煤都采用压滤；全厂洗水实现闭路循环，达到环保要求。厂区、厂房布置合理、规范,各生产环节符合规范要求。选煤厂工作制度定为每年330天，每天16小时。关键词：脱泥；三产品重介旋流器；煤泥水ABSTRACTThisdesignisforacentralcoalpreparationplantofcokingcoal,ofwhichthrough-putcapacityis1.2milliontoneveryyear.Thisrawcoalbelongstoaratherdifficultgradingofcoal.Accordingtocoaldistrinctandcoalquality,itemploystechnologicalprocessofdeslimingbeforeseparation,heavy-mediumcyclonewithtripleproductofzero-pressurefeed,combiningwithflotation..Therawcoaltobedressedwouldbedeslimedbeforeseparation.Afteritsdesliming,coalgrainfinenesssizeof0.5-50.0mmisseparatedbyheavy-mediumcyclone,andtechnologicalprocessofthickingflotationisused,ifitissmallerthan0.5mm.Afterseparationofrawcoal,thefinalcleancoalcontainscoalproductivityratio72.04%,ashratio9.47%,watercontent10.44%;andmiddingsproductivityratio18.99%,ashratio27.86%andgangueproductivityratio8.97%,ashratio72.86%.Allthequotasabovearrivesastandardofdesignrequirement.Deslimingbeforeseparationisadoptedinthetechnologicalprocess,whichhasincreasedseparationaccuracyandefficiencyofheavy-mediumcyclonewithzero-pressurefeed,andincreasedtherecoveryofthemedia.Flotationconcentrateandtailingsareallconcentratedwithfilterpressing.Thesluicingwaterisinaclosedcircuitinthewholeplant,itcanreachtherequirementofenvironmentalprotection.Factoriesregionandfactorybuildingsaredistributedreasonablyandnormally,andeachproducingstepisconformedtospecificationsandrequirement.Worksystemisregulatedasworking330daysforayearand16hoursperday.Keywords:deslime;heavy-mediumcyclone;slurry目录1前言..................................................................................................................................12厂区概况..........................................................................................................................32.1矿区总体概述........................................................................................................32.2地理概况................................................................................................................32.3气象及地震............................................................................................................33煤质资料分析....................................................................................................................43.1原煤煤质资料........................................................................................................43.2A层煤煤质资料分析.........................................................................................103.2.1A层原煤的筛分资料分析.......................................................................103.2.2A层煤的浮沉资料分析...........................................................................103.3B层煤煤质资料分析.........................................................................................113.3.1B层原煤的筛分资料分析.......................................................................113.3.2B层煤的浮沉资料分析...........................................................................123.4A、B层煤分组分级分析....................................................................................133.4.1分组分级条件..........................................................................................133.4.1A、B层煤分组分级分析.........................................................................143.5.1混合入洗原煤筛分资料分析..................................................................153.5.2混合入洗原煤浮沉资料分析..................................................................163.5.2混合入洗原煤可选性分析......................................................................164工艺流程的选择依据......................................................................................................174.1选前脱泥与不脱泥比较......................................................................................174.2选择重介选煤方法的依据..................................................................................184.3选择三产品重介旋流器的依据..........................................................................194.4选择有压重介旋流器分选的依据......................................................................194.5浓缩浮选..............................................................................................................204.6浮精压滤处理......................................................................................................204.7方案选择及经济技术比较..................................................................................214.7.1初步选定方案分析..................................................................................214.7.2方案的预测..............................................................................................224.7.3方案的技术比较......................................................................................274.7.4方案的经济比较......................................................................................294.7.8工艺流程图.....