《工业分析 Industrial Analysis》课件-钢铁中硫的测定方法介绍（双语）

项目六：钢铁分析任务三：钢铁中硫的测定钢铁中硫的测定方法介绍课程：工业分析中文Scenario6:SteelanalysisTask3:DeterminationofsulfurinsteelIntroductiontothedeterminationmethodofsulfurinsteelCourse:IndustrialAnalysisEglish一、钢铁中硫的危害硫是钢铁中有害元素，使钢铁产生热脆性钢铁中硫燃烧生成SO2或SO3，会污染环境，腐蚀设备钢铁中硫在高温下遇到氢会化合生成H2S，该气体是剧毒气体，对人体有害中文

一、ThehazardsofsulfurinsteelSulfurisaharmfulelementinsteel,causingittodevelopthermalbrittlenessThecombustionofsulfurinsteelgeneratesSO2orSO3,whichcanpollutetheenvironmentandcorrodeequipmentSulfurinsteelwillreactwithhydrogenathightemperaturestoformH2S,ahighlytoxicgasthatisharmfultohumanhealthEglish二、测定方法重量法燃烧法燃烧-滴定法燃烧-分光光度法燃烧-电导法燃烧-红外光谱法中文二、MeasurementmethodgravimetricmethodCombustionCombustiontitrationmethodCombustionspectrophotometryCombustionconductivitymethodCombustioninfraredspectroscopyEglish1、重量法因硫酸钡沉淀溶解而产生负偏差测定过程第一步第二步第三步样品用酸分解成硫酸盐试样溶液加入氯化钡使生成硫酸钡沉淀过滤沉淀，洗涤灼烧，称重计算中文1、gravimetricmethodNegativedeviationcausedbydissolutionofbariumsulfateprecipitationstep1step2step3

ThesampleisdecomposedintosulfatesusingacidAddingBaCl2tothesamplesolutiontogenerateBaSO4

precipitateFiltersediment,washandburn,weighandcalculateMeasurementprocessEglish2、燃烧法测定依据是让钢铁燃烧，其中硫转化为SO2而测定，方法缺点是硫的回收率低于90%，有时甚至更低，为提高测定准确性，常需注意以下几点：燃烧温度要高：1450~1510℃燃烧时间足够注意减少SO2的吸附选用优良的助熔剂防止SO2的接触转化中文2、CombustionmethodThedeterminationisbasedonthecombustionofsteel,inwhichsulfurisconvertedintoSO2.Thedisadvantageofthismethodisthattherecoveryrateofsulfurislessthan90%,sometimesevenlower.Toimprovetheaccuracyofthedetermination,thefollowingpointsshouldbenoted:Thecombustiontemperatureshouldbehigh:1450-1510℃SufficientcombustiontimePayattentiontoreducingtheadsorptionofSO2SelectexcellentfluxesPreventthecontactconversionofSO2Eglish（1）燃烧-滴定法碘量法：SO2经水吸收成为亚硫酸，用碘滴定酸碱法：SO2经过氧化氢水溶液吸收转化为硫酸，用碱滴定硼酸钠法：用0.2%硫酸钾和4%过氧化氢水溶液吸收SO2，用硼酸钠滴定生成的硫酸中文（1）CombustiontitrationmethodIodometricmethod:SO2isabsorbedbywatertoformsulfite,whichistitratedwithiodineAcid-basetitrationmethod:SO2isabsorbedandconvertedintosulfuricacidbyhydrogenoxideaqueoussolution,andthentitratedwithalkaliSodiumboratemethod:AbsorbSO2with0.2%potassiumsulfateand4%hydrogenperoxideaqueoussolution,anddeterminethegeneratedsulfuricacidwithsodiumborateEglish（2）燃烧-分光光度法褪色品红法：SO2经0.1mol/L氯化汞酸钠溶液吸收，在甲醛作用下与褪色品红反应，生成紫红色的化合物，测定该化合物吸光度。直接褪色法：SO2用蓝色碘-淀粉溶液吸收，SO2与碘作用而使蓝色变浅，测定蓝色的消褪量中文（2）CombustionspectrophotometryFadingfuchsinmethod:SO2isabsorbedbya0.1mol/Lsodiummercuricchloridesolutionandreactswithfadingfuchsinundertheactionofformaldehydetoformapurpleredcompound.Theabsorbanceofthiscompoundismeasured.Directfadingmethod:SO2isabsorbedbyablueiodinestarchsolution.SO2reactswithiodinetolightenthebluecolorofthesolution,andthefadingamountofthebluecolorismeasuredEglish（3）燃烧-电导法燃烧产生的SO2用含氧化剂的溶液吸收，SO2转变成硫酸，从而使溶液电导率发生变化，通过测定电导率变化值确定硫的含量。（4）燃烧-红外光谱法燃烧产生的SO2对红外光产生吸收，测定红外光吸收程度确定硫的含量中文（3）CombustionconductivitymethodTheSO2generatedbycombustionisabsorbedbyasolutioncontainingoxidants,andthegeneratedsulfuricacidchangestheconductivityofthesolution.Thesulfurcontentisdeterminedbymeasuringthechangeinconductivity.（4