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1、曧.4暋暋暋暋暋暋暋暋暋暋暋暋暋暋暋暋暋暋暋陕西科技大学学报暋暋暋暋暋暋暋暋暋暋暋暋暋暋暋暋暋暋Aug.2010Vol.28暋暋暋暋暋暋JOURNALOFSHAANXIUNIVERSITYOFSCIENCE&TECHNOLOGY暋暋暋暋暋暋·1·棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁棁*暋文章编号:1000灢5811(2010)04灢0001灢04STUDYOFpHVALUEEFFECTONTHESOLUBILITYOFSLOWRELEASEPOTASSIUMHEZhen,YINHai灢
2、rong,WANGWei,LIUXin灢nian,TIANPeng(SchoolofMaterialsScienceandEngineering,ShaanxiUniversityofScience&Technology,Xi曚an710021,China)Abstract:K2O灢RO灢SiO2(R=Ca,Mg)basedglassslowreleasepotassiumwerepreparedbysinteringmethodusingmineralslagandK2CO3asrawmaterials.Thedissolutionquant
3、ities+2+oftheKandMgintheglass灢basedpotassiumareinvestigatedbyAtomicAbsorption+SpectroscopyatdifferentpHvalues.TheresultsshowthatthedissolutionfractionsofK2+andMgare95%and70%inthecitricacidsolution,anddissolved86%and40%inam灢moniumcitratesolutionrespectively.In0.5Nhydrochloric
4、acid,citricacidwithpHvalueof2,andammoniumcitratesolutionwithpHvalueof4.5,thedissolutionratesfollowthese灢quence:hydrochloricacid>citrate>ammoniumcitrate.Keywords:slowreleasefertilizer;potashfertilizer;slagCLCnumber:S14暋暋暋暋DocumentCode:A0暋IntroductionN,P,Kisthreemainelementsre
5、quiredforplants;currentlythemostimportantfeatureofcom灢mercialfertilizersistheinstantdissolution.Usedofinstantfertilizers,cropsproductionhadbeengrowth.Butforthereleasedperunittimemuchhigherthanthenumberabsorbedofnutrientsofcrops,itisresultedtoresourceswasted,environmentalpoll
6、utionandotherissues.Atthesametime,asub灢stantialpartofthefertilizersgettingintothegroundwater,rivers,lakes,occurredtovolatilizationlost[1灢6]andlosing,pollutedthewaterenvironment.Moreover,thelong灢termusedfertilizersmaycausesoilcompaction,andithadseriousimplicationsintheincreas
7、eofgrainyields.Withtheappearedofslow灢releasingfertilizersandcontrolled灢releasingfertilizers,itnotonlyover灢camesomeillsofinstantfertilizers,butalsoincreasedtheyields.Thosefertilizerscanreduceenviron灢mentalpollutionandthewasteofresources.Thenutrientscanbefullyabsorbedbyplantsw
8、ithslowingreleasedofnutrientsandcontrollingnutrientsreleasedbasedonactual,a
