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1、试谈无水硫酸钠生产中的结晶问题Thisarticleiscontributedbylzhly1010PdfdocumentsmayexperiencepoorbrowsingontheWAPside.ItisrecommendedthatyoufirstselectTXT,ordownloadthesourcefiletothelocalview.32?"Chinawells"in1999second(total144)DiscussiononcrystallizationinanhydroussodiumsulfateproductionLiuYunqinLiZhipengof
2、ShanxichemicalindustrygroupLimitedbyShareLtdfourthfactory(ShanxiYuncheng044000)Abstract:Thispaperdiscussesthemainfactorsintheproductionofanhydroussodiumsulfatecrystallizationconditionsandtheinfluenceofcrystallization.Keywords:anhydroussodiumsulfateevaporation,crystallization,nucleation,supers
3、aturation,dissolution,evaporationprocess,productionofanhydroussodiumsulfate,crystallizationisaveryimportantproblem.Aseriesofcharacteristicsofcrystallineformationandgrowthnotonlyaffecttheyieldandqualityofproductsdirectly,butalsothecrucialissueofwhethertheproductioncanbecarriedoutsmoothly.Thefo
4、rmationof111crystalnucleiunder1crystallizationconditionsisdiscussedin21313Dissolution-evaporationprocessproducesanhydroussodiumsulfate,evaporationcrystallizationiscompletedonce,crystallizationiscarriedoutinsolution.Theprimaryconditionofcrystallizationinsolutionisthesupersaturationofthesolutio
5、n.Whenthesolutionevaporatestoacertaindegreeofsupersaturation,asaresultofotherparticlesinthesolutionorundertheactionofexternalforce,thesolutionitselfprecipitatesthesolidparticles,whichformanucleus.Ifthesolutionisnotsupersaturation,thenucleuswillnotform.Thesimplifiedmathematicalexpressionofnucl
6、eationrateis:Eachm3liquorfreezingto10centigradeprecipitationofNa2SO4?H2O31210(20.66%-4.41%)x1.1322222(t/=0.4694m3=469.4(motherliquor)kg/m3Na2SO4H2motherliquor)?Owith10finerefineddissolvednitrateinwaterof50DEGC,senttothevacuumevaporationNa2SO4preparedwithoutwater.Theoretically,theNa2SO4is469.4
7、x132=198.59(kg/m3motherliquor)312(1).Iffrozeninsummer,itrequiresalotofcold3summaryof311,saltextractionandfreezingmethodtorecovermotherliquor,cansavegreatly(receiveddate:1998107117)Frozenequipment,biginvestment,uneconomical.Accordingtothenatur
