磁处理对水溶液pH值和电导率的影响2pdf

:2001-05-14:(99J044)pH黄征青,徐洪涛,黄光斗(,430068):碳酸钙、碳酸氢钙及其混合水溶液分别以3.7m/s的流速通过磁场强度为6040高斯的正交磁场进行循环运行。磁处理后碳酸钙水溶液的pH值快速下降直至恒定,碳酸氢钙水溶液的pH值先下降后上升出现一最低值,而混合水溶液的pH值则缓慢下降,三种溶液的电导率均上升;室温放置24h后pH值的变化趋势未变,但电导率变得相近,说明磁处理主要通过促进CO2的溶解而起作用的并具有“记忆效应”,这种作用与溶液的性质有关;溶液加热后的pH值及电导率的变化也证明了这一点。:磁处理;防垢;水处理:O646;TU991.27　　:A　　:1000-3770(2003)01-022-03,,CaCO3pHCO21　实验部分1.1CaCl2AR,Na2CO310H2OAR,NaHCO3AR:6.0Ls/cm,pH6.72PHS-3C,;DDS-11A,1.21.2.1　实验设备1,6040,3.7m/s1.2.2　实验方法与步骤:0.3gCaCl2500mL,0.3gNa2CO310H2O1000mL;1000mLNa2CO33,CaCl21min,1100mL,pH;4,10min20min30min40min60min23456100mL,pH;624h图1　实验设备示意图1.;2.;3.4.6.;5.pH660(30min),24hpHpH34HCl;0.3gCaCl2500mL,0.2gNaHCO31000mL,pH34HCl;0.3gCaCl2第29卷　第1期2003年2月　　　　　　　TECHNOLOGYOFWATERTREATMENTVol.29No.1Feb.,2003500mL,0.2gNaHCO3500mL,0.2gNa2CO310H2O500mL,2　结果与讨论2.1pH图2　磁处理后溶液的pH值变化示意图2,CaCO3pH,CO2,CO220min,;Ca(HCO3)2pH,CO2,CO210min,,HCO-3CO2-3,,pH;pH,CO2,,pH3,24hpH,,,图3　溶液24h冷却后的pH值变化示意图2.2124h24h(Ls/cm)()(Ls/cm)()(Ls/cm)()CaCO3145817.846017.846518.5249521.047017.847018.5352024.046517.847018.5454026.246017.847018.5555528.046017.847018.5655528.246017.847018.560,,Ca(HCO3)2152017.652517.855020.0255021.052017.854620.0355021.551017.853520.0456222.650817.853520.0560026.050017.853520.0662528.050017.853220.011min8min70,,141018.043019.042820.0243020.642519.043020.0345823.242219.043520.0448225.442019.044020.0549826.842619.044020.0653030.043019.044020.070,,1,,,,23,pH,24h,,,CO2,CO2CaCO31,pH(4),,Ca(HCO3)223,pH(4),0.3;,Ca(HCO3)2,,20min;,,30min;24h,,,,Ca(HCO3)2图4　加热的溶液冷却24h后的pH值变化示意图INFLUENCEOFMAGNETICTREATMENTONTHEpHVALUESANDTHECONDUCTIVITYOFWATERSOLUTIONHUANGZheng-qing,XUHong-tao,HUANGGuang-dou(ChemicalEngineeringDepartmentofHubeiPolytechnicUniversity,Wuhan430068,China)Abstract:Threewatersolutionswererespectivelycirculatedthroughanorthogonalpermanentmagneticfieldwiththeintensityof6040gaussataflowrateof3.7m/s.ThepHvalueofCaCO3solutionrapidlyde-creasedandthenreachedaconstant;thepHvalueofCa(HCO3)2solutionfirstlydecreasedandthenin-creasedwithaminimumvalue,butthepHvalueofCaCO3andCa(HCO3)2mixedsolutionslowlyde-creased;theroomtemperature,thepHvaluehadthesimilarvaryingcurvesasthatbeforetothecoolingandthetreatedanduntreatedsolutionsalmosthadthesameconductivity.Theseresultsshowedthatmag-netictreatmentincreasedCO2dissolvinginthesolutionsandslightlyaffectedtheconductivity;inaddition,theeffectofmagnetictreatmentdependedonthesolutionandthetreatedsolutionhadthemagneticmem-oryeffect.Theresultsofheatedsolutionsalsoapprovedthisresult.Keywords:magnetictreatment;anti-scaling;watertreatment24291