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1、试谈无水硫酸钠生产中的结晶问题（Discussiononcrystallizationinanhydroussodiumsulfateproduction）PdfdocumentsmayexperiencepoorbrowsingontheWAPside.ItisrecommendedthatyoufirstselectTXT,ordownloadthesourcefiletothelocalview.32?"Chinawells"in1999second(total144)Discussiononc
2、rystallizationinanhydroussodiumsulfateproductionLiuYunqinLiZhipengofShanxichemicalindustrygroupLimitedbyShareLtdfourthfactory(ShanxiYuncheng044000)Abstract:Thispaperdiscussesthemainfactorsintheproductionofanhydroussodiumsulfatecrystallizationconditionsa
3、ndtheinfluenceofcrystallization.Keywords:anhydroussodiumsulfateevaporation,crystallization,nucleation,supersaturation,dissolution,evaporationprocess,productionofanhydroussodiumsulfate,crystallizationisaveryimportantproblem.Aseriesofcharacteristicsofcrys
4、tallineformationandgrowthnotonlyaffecttheyieldandqualityofproductsdirectly,butalsothecrucialissueofwhethertheproductioncanbecarriedoutsmoothly.Theformationof111crystalnucleiunder1crystallizationconditionsisdiscussedin21313Dissolution-evaporationprocessp
5、roducesanhydroussodiumsulfate,evaporationcrystallizationiscompletedonce,crystallizationiscarriedoutinsolution.Theprimaryconditionofcrystallizationinsolutionisthesupersaturationofthesolution.Whenthesolutionevaporatestoacertaindegreeofsupersaturation,asar
6、esultofotherparticlesinthesolutionorundertheactionofexternalforce,thesolutionitselfprecipitatesthesolidparticles,whichformanucleus.Ifthesolutionisnotsupersaturation,thenucleuswillnotform.Thesimplifiedmathematicalexpressionofnucleationrateis:Eachm3liquor
7、freezingto10centigradeprecipitationofNa2SO4?H2O31210(20.66%-4.41%)x1.1322222(t/=0.4694m3=469.4(motherliquor)kg/m3Na2SO4H2motherliquor)?Owith10finerefineddissolvednitrateinwaterof50DEGC,senttothevacuumevaporationNa2SO4preparedwithoutwater.Theoretically,t
8、heNa2SO4is469.4x132=198.59(kg/m3motherliquor)312(1).Iffrozeninsummer,itrequiresalotofcold3summaryof311,saltextractionandfreezingmethodtorecovermotherliquor,cansavegreatly(receiveddate:1998107117)Frozenequipment,biginvestment,unec
