卤水脱色及其资源化制备无水氯化镁的研究

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1、AbstractInordertoprepareanhydrousmagnesiumchlorideastherawmaterialofelectrolysisprocess，thechromogeniccauseofbrineinTlanjinChangluHangusalternWasstudied，andacombinationdecolorizationprocessofoxidationandadsorptionusedbyhydrogenperoxideandzirconiumhydroxideWasdesigned．Thediscoloredbrinewasusedtocomp

2、osemagnesiumchloridehexahydram-anilinehydrochloridedoublesaltandammoniumcarnallitedoublesalt．Thenthedoublesaltwaspmparedtoanhydrousmagnesiumchioridebypyrogenicdecompositionmethod，whichheatedbymicrowave-tubularfumaceheatingprocess．Theresearchresultsforchromogeniccauseofbrineshowthat：themainchromogen

3、icsubstanceswaso唱anicmattersinbrine．Thechromaofbrinecouldremovedsignificantlybythecombinationdecolorizationpmce鲻ofoxidationandadsorptionusedbyhydrogenperoxideandzirconiumhydroxide，theoptimumconditionsofdecolorizationisshowedasfollows：thepHvalueofbrineneedtobeadjustedto2～3atroomtemperature．thedosage

4、ofhydrogenperoxideisl％(volumeratio)andtheoxidationtimeis2h，theadsorptiontimeis40min，thedosageofzirconiumhydroxideis609‘L～．Undersuchconditions,thedecolorizingrateofbrinecouldreach99％，theremovalofCODcrcouldreach85％，therateofmagnesiumionslosscouldcuttol％．Thezirconiumhydroxidecouldbereusedbydesorptionu

5、sing5％sodiumhydroxidesolution．Theresearchresultsofadsorptionperformancesofzirconiumhydroxidefororganicmattershowthat：themechanismtoremoveorganicmattersofzirconiumhydroxideWasFandertVaalsforceandhydrogenbondforce．theadsorptionisothermsoforganicmatterfitwellintotheLangmuiradsorptionisotherm，theadsorp

6、tionkineticdataWaSfittedtothepseudo-second--oralermodel．Onthebasisofkineticsofpyrogenicdecompositionfordoublesalt，anhydrousmagnesiumchIoridewaspreparedbydoublesaltpyrogenicdecompositionmethod，whichheatedbymicrowave-tubularfilmaceheatingprocess．Theexperimentalresultsshowthat：thedifficultyofdehydrati

7、onproce璐wasreducedbyusingpyrogenicdecompositionmethodofmagnesiumchloridehexahydrate-anilinehydrochloridedoublesalttoprepareanhydrousmagresiumchloride，butthismethodneedhighprocessrequirements，themWCI"emuchim