简介:Byanalyzingthethermalandburdenstructureconditionsinsidethemelter-gasifierofCOREXprocess,theadvantageanddisadvantageofPCIintothemelter-gasifierareclarified.TheinfluenceofPCIontherunningconditioninsidethefurnaceisanalyzedbasedontheinformationfromproductionoperationandmathematicalandphysicalsimulations,andmeasurestotacklewiththeproblemsarisingfromPCIareproposed.Themainresultsareasfollows.①Duetotheunfavorableconditionsforcokingofcoalinthemelter-gasifier,cokingofchargedlumpycoaltogetsemicokewithgoodsizeandstrengthcanhardlybeexpected.Tomaintainthepermeabilityoftheburdencolumn,apackedbedsimilartoblastfurnaceisnecessary.Therefore,alittlemorecokewithPCIinplaceofmostofthelumpycoalmayimprovetherunningofthereactor.Thiscanalsomakethelumpycoalselectioneasier.②Overallheatbalanceanalysisofthemelter-gasifiershowsthatPCIhasnoeffectonthethermalconditionofthefurnaceasawhole.Localheatbalanceanalysis,however,showsthattheheathofthemelter-gasifierisinacriticalstateoflowheatsupply.PCIintothehearthwilldeterioratethethermalcondition.ToavoidthecoolingofthehearthzonebyPCI,moreoxygencanbeblowntothehearthzone,i.e.increasetheoxygensupplytothehearthanddecreaseaccordinglytheoxygensupplytothefreeboard.Moreoxygensupplytothehearthseemstobringouttheissueofanincreaseinfuelrateand/ortherebythesmeltingintensity.DetailedanalysisofthephysicalchemicalprocessesconcludedthatPCIwithmorecorrespondingoxygensupplywillnotleadtotheincreaseoffuelrate.③Comparingwithblastfurnace,theracewayvolumeofCOREXmelter-gasifierisaboutonly1/10~1/5ofthatofcorresponding-sizeblastfurnace.ThissmallracewayisnotfavorableforPCI.ToenlargetheracewaytogetmorefavorableconditionforPCI,lesstuyereswithmoreoxygensupplyofeachtuyereisproposed.④Comparingwithlumpycoalfeedingintot
简介:PresentlytheironandsteelmakersarecompelledtoincorporaterationalinitiativestoreduceitsprocessingCO2totalemissions.Inthemediumandlongterm,theinjectionofsmallparticlesofbiocharthroughthetuyereesinblastfurnaces,herecalledBio-PCI,offersattractivefeaturesfromtheenvironmentalandmetallurgicalpointofview,asitisarenewablecarbonneutralreductantandpresentslesserimpuritiesthancoke.However,itsutilizationinironplantsisbeenhinderedbythetraditionallargeavailabilityofrelativelyeconomicalcoalandcoke.Asthecostoftheprincipalprocessinginputsincreases(coal,cokeandironore)thegapbetweenfossilandrenewablereductantsdecreases.Inthissense,ourcontributionaimstocomplementthemetallurgicalinquiryoftechnicalfeasibilitywithastrategicidentificationoftheareaswithbestprospectstobenefitsfromtheincorporationofBio-PCI:wherecanitflourish?.Ouranalysisleadstoindicatethatemergingcountriesinspecific,China,BrazilandIndia,areinaprimepositiontoincorporatetheBio-PCIastheysimultaneouslycomplywithagrowingironindustrybasedonblastfurnaces,andpossessanimportantpotentialforenergygenerationfromforestryresidues.
简介:试验研究的矿样来自西藏墨竹工卡,矿石为复杂难选铜铅锌多金属矿。依据矿石性质的特点,铜铅锌浮选采用铜铅混合浮选、然后再进行铜铅分离,铜铅浮选尾矿进行浮选锌矿物的原则工艺流程。该工艺的关键技术如下:(1)铜铅混合浮选采用BD、丁基铵黑药和黄药组合捕收剂;(2)采用硫化钠、硫酸锌和碳酸钠组合作为锌矿物的抑制剂;(3)铜铅分离采用活性炭脱药;(4)CMC、Na2SO,和Na2SiO,环保型的组合药剂作为铅矿物的抑制剂。通过上述技术创新,成功地实现了铜铅分离,并取得良好的选矿试验指标。该工艺率先于2007年在西藏中凯墨竹工卡选矿厂取得成功。