高硫铝土矿氧化钙焙烧及溶出性能试验研究__胡勋(冶金

（2012届）本科毕业论文资料题目名称：高硫铝土矿氧化钙焙烧及溶出性能试验研究学院（部）：冶金工程学院专业：冶金工程学生姓名：胡勋班级：冶金工程083学号08495200122指导教师姓名：王宇菲职称教授最终评定成绩：中湖南工业大学教务处2012届本科毕业论文资料第一部分毕业论文（2012届）本科毕业论文题目名称：高硫铝土矿氧化钙焙烧及溶出性能试验研究学院（部）：冶金工程学院专业：冶金工程学生姓名：胡勋班级：冶金工程083学号08495200122指导教师姓名：王宇菲职称教授最终评定成绩：中2012年5月湖南工业大学本科毕业论文I摘要本试验以一水硬铝石高硫型铝土矿为原料，先在SRJX-4-13型马弗炉中进行氧化钙焙烧脱硫，测定其脱硫率；然后在GCF-3型高压釜中对原矿和各焙烧矿进行高压溶出，研究溶出液中S2-含量的变化以及不同焙烧条件对溶出性能的影响。课题考察了氧化钙在焙烧过程中的作用以及焙烧时间，焙烧温度对焙烧、溶出过程的影响，旨在使矿石相对溶出率达到96%以上，溶出液中S2–降低至0.20g/L以下。研究结果表明：焙烧温度对相对溶出率和脱硫率的影响最大，焙烧时间度次之，氧化钙添加量最小；脱硫率随焙烧温度升高而加大，在焙烧时间45min-60min范围内，随时间增加而加大，而随氧化钙添加量的增加而减小；最佳焙烧温度为600℃，最佳焙烧时间为45min，最佳氧化钙添加量为1%。；铝土矿在最优组合条件下焙烧后，二价硫离子含量为0.18g/L，相对溶出率为96.11%。焙烧后铝土矿中硫化物型硫含量降低，加CaO效果更好，CaO起到固硫的作用而降低焙烧过程散于空气中的SO2的含量；原矿经氧化钙焙烧后溶出液中S2-的含量显著降低，矿石的溶出性能得到有效改善。关键词：高硫铝土矿；脱硫；氧化钙焙烧湖南工业大学本科毕业论文IIABSTRACTTheexperiment,theoxidationroastingprocessofthedesulfurationfromthediasporichighsulfurbauxite，isstudiedintheSRJX-4-13muffleroastertogetthedesulfurizationrate.ThenBasedonthese,thechangeofS2-concentrationinaluminatesolutionanddifferentroastingconditionsinfluencewerestudiedbyBayerprocesswiththeGCF-3Highpressurereactor.ThesubjectexaminestheactionofCaOaswellastheroastingtemperatureandroastingtime,andwhattheytaketotheroastingexperimentandautoclavingexperiment.Thepurposeoftheexperimentistomaketheextractionrateofaluminiumover96%andtheS2--concentrationinaluminatessolutionlowerthan0.20g/L.Theresultsshowedthattheroastingtemperatureplaysthemostontherelativedissolutionrateandthedesulfurizationrate,theroastingtimefollowedandtheamouteofCaOplaysthelast;Desulfurizationrateincreaseswiththeincreasingofroastingtemperatureandincreaseswiththeincreasingofroastingtimewhentheroasringtimeisduring45min-60min,butitdecreaseswiththeincreasingofCaOaddition;Theoptimumroastingtemperatureis600℃whilethebesttoastingtimeis45minandthebestCaOadditionis1%;Undertheseconditions,theextractionrateofaluminiumbauxitecomesupto96.11%andtheS2-concentrationinaluminatessolutionis0.18g/L.Thecontentofsulfide(mainlypyrite)reducedanddidmorewiththeadditionofCaOafterbeingroasted;CaOplayedtheroleoffixingsulfurandloweredthecontentofsulfureseparatedintheair.ItcoulddramaticallylowerS2-concentrationinaluminatesolutionandimprovedigestibilitybyroasting.Keywords：highsulfurbauxite；desulfuration；CaOroasting湖南工业大学本科毕业论文III目录第1章绪论.....................................................................................................11.1铝土矿概况及研究目的.........................................................................................11.2硫的危害及脱硫方法.............................................................................................11.2.1硫在铝土矿中的赋存状态...........................................................................11.2.2硫对氧化铝焙烧生产工艺的危害...............................................................11.2.3氧化铝生产中的主要脱硫方法...................................................................11.3国内外研究现状.....................................................................................................21.3.1国外脱硫工艺现状.......................................................................................21.3.2国内脱硫工艺现状.......................................................................................31.4本课题研究的内容及意义.....................................................................................31.4.1本课题研究的主要内容...............................................................................31.4.2本课题提出的意义.......................................................................................4第2章试验与方法.........................................................................................52.1试验原料.................................................................................................................52.1.1铝土矿...........................................................................................................52.1.2石灰...............................................................................................................62.1.3循环母液.......................................................................................................72.2试验设备.................................................................................................................72.3试验试剂.................................................................................................................92.4试验过程.................................................................................................................92.4.1试验原理.......................................................................................................92.4.2试验方法.....................................................................................................102.5分析方法...............................................................................................................102.6试验流程...............................................................................................................12第3章结果分析与讨论...............................................................................133.1预备试验分析与讨论.........................................................