碱法钛白清洁生产工艺中反应与分离过程研究

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1、北京化工大学硕士学位论文碱法钛白清洁生产工艺中反应与分离过程研究姓名：冯杨申请学位级别：硕士专业：环境工程指导教师：王京刚;齐涛20090527北京化工大学硕士学位论文的金红石型二氧化钛。关键词：高钛渣，钛铁矿，氢氧化钠，熔盐，二氧化钛ⅡABSTRACTREACTIoNANDSEPARATIoNPRoCESSRESEARCHoNCLEANMETALLURGICALTECHNoLoGYoFTITANIUMDIoⅪDEWITHALKAI．INEABSTRACTTitaniumdioxide，alsonamedtitaniu

2、mwhite，isthebest—qualitypigmentintheworld．Currently,asthewidelyusedtechnologiesfortheproductionoftitaniumdioxidearesulphateprocessandchlorideprocess，whichdischargealargeamountoftoxicwaste，resultinginseriousenvironmentalproblems．Itisofgreatrealisticandsocialmeani

3、ngstodevelopeanew,green，higheffficiency-cleanprocessfortitaniumdioxideproduction．Basedontheformerreserch，anewprocessoftitaniumdioxideproductionbydecomposinghightitaniumslagorilmenitewithhighactivityNaOHorKOHwasproposedinthepresentpaper．Theaimofthisnewprocessisto

4、eliminatethepollutionatthesourceandtofullyutilizevaluablecompoundsintitanium-resources．Themainpointsaleasfollows：(1)DecompositionoftitaniumslaginmoltenNaOHwasstudied．Thedecompositionrateoftitaniumslagwasabove97．5％undertheoptimum．III．北京化1二大学硕上学位论文conditions．Themo

5、ltenreactionproductwastreatedbythree-stagecountercurrentwash，andthesolidintermediateafterwashwasanalyzed．(2)ThedecompositionkineticsoftitaniumslagwithmoltenNaOHwasstudied．Resultsindicatedthattheshrinkingcoremodelwithchemicalreactioncontrolledprocesswasmostapplic

6、ableforthedecompositionoftitaniumslag，whentemperaturerangeof425—500"C，NaOH—to-slagmassratioof1．0：1，particlesizeof72—90埘【11．AccordingtotheArrheniusexpression，theapparentactivationenergyforthedecompositionoftitaniumslagWasestimatedtobe62．35kJ．mol-1．(3)Newprocessis

7、complexationofferricionsinacidmediumusingethylenediaminetetraaceticacid(EDTA)aschelatingagentfromthedissolvedsolidintermediateafterwash．Resultsshowed也atanatasetitaniumdioxidecouldbeobtainedbyhydrolysisofthesolidobtainedfromthefiltrationaftercomplexation，anditspu

8、rityWasupto99．3％．(4)ThehydrolyzingprocessofK4Ti30s，productofthereactionbetweenilmeniteandKOHsub—moltensalt，WasoptimizedintheHClsolutionwithhighconcentration．Undertheo