制盐工艺流程

制盐工艺流程靳志玲(中盐制盐工程技术争论院，天津300450)真空精制盐1简介目前，国内大局部井矿盐企业承受以井矿盐卤为原料，北方局部生产企业承受原盐化成饱和盐水再精制真空盐的生产方法。随着国内“两碱”的快速进展和人饱和卤水再生产精制盐，不仅增加了原盐的消耗，而且降低了盐田面积的使用效排放、无污染、循环经济的目的。工艺流程简述卤水经滩田日晒蒸发，至饱和后引入一个卤水库中储存。卤水库的作用，一是储存确定量的饱和卤水，以备真空制盐生产的需要;二是卤水在此有确定的停留时料、末效排盐浆，集中排母液的方式进展生产。IIIIIIII，IIIIV;IVIV1。1工艺的优缺点15制盐生产工艺，其实施效果如下:本工艺承受饱和卤水制盐，不需要淡水化原盐，淡水消耗低，可节约淡水资1.4-0.2m3，3.5-4.53.73m3，2.1-4.3m3节约日晒盐场土地，削减原盐消耗，提高了盐田利用率1t1.2t15t18t136.361650t/80,)，承受饱和卤水直接进蒸发罐工艺，不需要饱和卤水进结晶池连续蒸发制盐，只需要建设一个约2公顷的饱和卤库，因134.36160/t136.8/600099.4,，精钙、镁杂质，因此，承受三次不同的洗涤方式洗涤盐浆，提高精制盐质量。2用饱和卤水直接生产精制盐母液损失小，提高了母液的利用率，实现盐化联产1t25.5m324,30g/l，29,34?Be?，1.4,0.6，排出的6589t，36540t18900t，氯37600t，510t18t18m3，45,左右，也8.1m32036t15280t，硫酸7727.4t，氯化钠总量为11128t，162t。因此，该工艺可为盐55.04?以上，可通过管道直接进入下步生产氯化钾的1157/年由于滩田饱和卤水较化盐卤水氯化钠含量低，因此单位产品的蒸发水量较高，吨盐产品电、蒸汽消耗量较大，能耗较高。大量盐田结晶面积，总体投资低。国主要经济技术指标比较330,。结论对于北方海盐区生产精制盐企业来说，利用滩田饱和卤水直接进蒸发罐制取精和卤水再进展制盐是对土地资源的铺张，再有其生产本钱低，企业有较高的利净，4NewtechnologyofproducingrefinedsaltbyaddingsaltfieldsaturatedbrineintoevaporatordirectlyJinzhilingGeJinyang(SaltResearchInstituteChinaNaturalSaltIndustryCorporation,TianJin300450)Abstract:AfterMakingsalinesaturatedbrineflowinevaporatingpot,thesodiumchlorideisobtainedbyevaporativecrystallization.Calciumandmagnesiumionscanberemovedbywashingsaltthreetimesinordertogetthesodiumchloridethatthepurityisover99.1percentandthemotherliquorthathavehighconcentration.Keywords:salinesaturatedbrine,vacuum,refinesaltmagnesiumchlorideetc.inordertomakeuseofallkindsofeffective1BRIEFINTRODUCTIONconstituentsinthebrineandachievetheAtpresent,thematerialsofmakingobjectsofnodischarge,nopollutionandvacuumsaltareusingthewellandrockcirculatingeconomy.saltinmostofthewellandrocksaltcorporationsandthesaturatedbrinegot2.INDICATIONOFTHEbydissolvingcrudesalt.AlongwiththePROCESSFLOWrapiddevelopmentofcausticalkaliandsodiumcarbonateandthegrowthintheAfterbeingsolarizedtosaturationpeople’slivingstandard,theinbeachfieldbrinewasinductedtocontradictionofcrudesaltinsupplyandbrinetankandstored.Ontheonehandrequireismoreandmorestoodout.brinetankcanstoresomesaturatedbrineParticularlyintheseasaltareas,thatisusedtoproducevacuumsalt.Onproductingrefinesaltwithsaturatedtheotherhand,brinehavesomebrinethatisgotbydissolvingcrudesaltresidencetimeheresosomeimpuritiescanincreasetheconsumptionofrawcanbedepositedinordertomakethesalt,reducetheavailabilityfactorofsaltbrinebepurified.Afterbeingdrawoutedfield,addinvestmentandproductionfrombrinetankthecleanedsaturatedcost.Thiswillinfluencetheeconomicbrinewaspumpedtofinebrinetankinefficiencyofediblesaltmanufacturingthemanufacturesaltplant.Andenterprises,makethemreduceoutputproductioncanbegoneonbyusingtheandaffectpeople’slive.methodsofpreheatingbrine,However,usingthemethodoftransferringstuffinparallelflow,makingsalinesaturatedbrineflowindischargingsaltslurryinthelasteffectevaporatingpotandthenobtainingandexportingmotherliquorsodiumchloridebyevaporativeconcentratedly.Thesaltinthefirsteffectcrystallizationcansavingcrystalarea.tankisdischargedtothecirculationpipeFurthermore,themotherliquorcanbeofthesecondeffect,Thesaltintheusedasmaterialtoproducechemicallysecondeffecttankisdischargedtotheproductssuchaspotassiumchloride,circulationpipeofthethirdeffect,The5saltinthethirdeffecttankisdischargedtothecirculationpipeofthefourtheffect.Atlastthesaltiscollectedinthefourtheffecttankwherethesaltslurryandthemotherliquoraredischarged.Fig.1isthediagramoftheprocessflow.Figure.1DiagramoftheprocessflowRELATIVEMERITSOFTHEPROCESSInthenorthofChinaaproductionlinehasbeenbuiltwiththisprocess,whichcanproduce1.5milliontonssaltperyear.Comparingwithreworksaltproductionprocess,theeffectofthisprocessisasfollows:Thesaturatedbrineisusedinthisprocesstaketheplaceofdissolvingcrudesaltwithfreshwater.Suchcanreducetheconsumptionoffreshwaterandsavetheresource.Accordingtotheproduceconditions,producing1tonsaltwillconsume1.4-0.2m3freshwater.Andthatifusethereworkingsaltprocess3.5-4.53m3freshwaterwillbeused.Thatistosay2.1-4.3m3freshwatercanbesavedcorrespondingto1tonsalt.6Savingthesolarsaltfield,reducetheconsumptionofcrudesalt,increasetheavailabilityofthesaltfield.Forthereworkingsaltproductionline,asageneralruleproducing1tonrefinesaltwillconsume1.2tonssolarsalt.Producing1.5milliontonrefinesaltneeds1.8milliontonscrudesaltand136.36hectarecrystalarea(Accordingtotheexperiencethatonehectarecanproduce1650toncrystalandtheeffectiveareais80percent).Usingtheprocessthatthesaturatedbrineispumpedtoevaporatingtankdirectlythebrineneednotevaporateincrystalpondbutforasaturatedbrinestoreroomofabout2hectare.Suchcansavesurfaceareaof134.36hectareandthisareacanbeusedtoincrease8547tonoutputofsolarsalt.Hencetheproductivevalueofsolarsaltwillincrease136.8tenthousandyuanaccordingtothemarketpriceofsolarsaltwhichis160yuan/t.Andlandvalueof60millionyuancanbesavedifthelandis30,000yuanpermou.Adoptingthemethodofwashingsaltthreetimesinordertogetridofcalciumandmagnesiumions,makethepurityofsodiumchlorideexceed99.4%andmaketherefinesaltreachfirstquality.Intheprocessofevaporativecrystallizationmuchmotherliquorwillexistinsaltslurry.Themotherliquorcontainsalotofimpurityofcalciumandmagnesium.Sosaltslurryiswashedinthreedifferentwaysinordertoimprovethequalityofrefinesalt.Usingthesaturatedbrinetoproducerefinesaltcanreducetheconsumeofmotherliquors,enhanceit’savailabilityandrealizetheproductionofsaltandchemicalstogether.Theprocessthatproducingexcellentvacuumsaltwithsalinasaturatedbrinedirectlycanget1.7m3motherliquorinrelationto1trefinesalt.Onthebaseof150,000tonrefinesalt,wecanget255,000m3evaporationmotherliquor.Inbitterbrinewhoseconcentrationis29,340Be?thecontentofpotassiumchlorideis24,30g/landtheratioofsodiumandmagnesiumis1.4,0.6.And6589tpotassiumchloride,36540tmagnesiumchloride,18900tmagnesiumsulfate,37600tsodiumchlorideand510tbrominearecontainedinthebitterbrine.Thebitterbrineisabout180,000m3inrelationto180,000tcrudesalt.Afterbeingsolarizedrepeatedlyandconsumingforfilterthebrineisleft45%whenitispumpedtochemicalplant.Thatistosaythereare81,000m3brine.Bynowthereare2036tpotassiumchloride,15280tmagnesiumchloride,77727.4tmagnesiumsulfate,11128tsodiumchlorideand162tbromine.Sotheprocesscanprovidemorematerialforsaltandchemicalsplants,heightenproductionefficiency,reduceallkindsofconsumptionandsaveenergy.Thetemperatureofthemotherliquorgotfromthisprocessisover55.04?.Soitcanbepumpedtothepotassiumchlorideprocesswithpipetoproducepotassiumchloride.Suchwillsavetheheatquantityintheprocessofproducingpotassiumchloride.Andtheheatquantityisequalto11578t/ystandardcoal.Becausethecontentofsodiumchlorideinthebeachsaturatedbrineislowerthanthecontentinthebrinethatisgotbydissolvingsalt,theevaporatedwaterofunitproduceishigher,theelectricityandsteamconsumptionaremore.Thatistosaytheenergyconsumptionishigher.Theheatexchangeareaisalittlerbiggerthantheprocessofdissolvingsalt,sotheequipmentinvestmentishigher.Butbecauseofsavingalotofsalinacrystalareathetotalinvestmentislower.COMPARETHEECONOMICINDICATORSWITHTHEPROCESSOFDISSOLVINGCRUDESALTANDTHENREMAKINGSALTInChinaTherearetwomainmethodstoproducingvacuumsaltinseasaltarea.Oneispumpingthebeachsaturatedbrineintoevaporatingpot.Theotherisusingthesaturatedbrinegotbydissolvingcrudesalt.Comparingthesecondmethodwiththefirstmethodtherelativemeritsofthesecondmethodisasfollows:(1)needtobuildcrystalpondandthetotalinvestmentishigher.(2)Theevaporatedwaterofunitproductissmallerandtheequipmentinvestmentislower.(3)Theconsumingofelectricityandsteamislower.(4)Theconsumingofwaterismoreand2.4m3waterwillbeconsumedinrelationto1tonsalt.(5)Thelossofmotherliquorisbigger.Theeconomicindicators