浸出-萃取法綜合回收磷尾礦中磷、鎂的試驗研究.pdf

1、貴州大學碩士學位論文浸出萃取法綜合回收磷尾礦中磷、鎂的試驗研究姓名：楊書懷申請學位級別：碩士專業(yè)：有色金屬冶金指導教師：李軍旗20080601貴州大學碩士學位論文AbstractForthegradualdepletionofthephosphateresourcesandthetendingdepletedgradeofthem，inordertosatisfythewet—processphosphoricacidproductio

2、n(WPA)orequalityrequirementsofrawmaterials，itwillbealargeamountofphosphorustailingsperyearthroughtheuseofvariousmineralprocessingtechnologyIfwecalltakecomprehensiveutilizationofthephosphorustailings，thatnotonlycanreducet

3、hewasteofresources，butalsopreventoccupiedlandandenvironmentalpollutionwhichthetailingspiledupThroughthechemicalanalysisofphasefromthisflotationtailings，wefoundthatthemainphasesinthetailingsareCa(COs)2、Mg(C03)2andCasF(P04

4、)3，withthecontentofP205from7％to9％，thecontentofMgOisashighas16to18percentwhichattachahighmagnesiumphosphatetailingsThisarticleinitiallyexploredthenewprocesswhichusinghydrochloricacidandsulfuricacidleachingmixedtodecompose

5、phosphatetailings，thisnewtechnologyresearchacidsolutionprocessconditionsofphosphate，andstudyMgCl2andH3P04extractionIntheprocessoptimizationstudiesofacidconditions，Igotoptimumconditionsinlaboratoryconditionsthroughthesing

6、lefactororthogonaltestTheoptimumconditionsare60min’sreactiontime，80℃’stemperature，the5：1ratioofliquidtosolid，the105excessivecoefficientofacidInthiscondition，theextractionrateofP205andMgOarehigher，respectivelyattain972％an

7、d985％AndtheinfluenceoffactorstoleachingrateoftheP205andtheMgOaresimilarThetwomostnotablefactorsarethereactiontimeandtheratioofliquidandsolidleachingrate，theleastnotablefactorsiscoefficientofexcessiveacid，whichmainlycause

8、dbytheerrorThroughtheextractionexperimentalstudyIdeterminethechoiceofnbutanolastheextractionsolvent，andthenidentifiedthebestextractionconditionsandtheanti—extractionprocessinthefurtherpilotstudyInthebestextractionconditi