磷矿石论文：磷矿石直接还原还原率助熔剂还原动力学

1、【中文摘要】磷酸是制备精细磷酸盐和磷复肥等磷化工产品的基本原料,在工农业和国防军工以及电子等尖端科学领域都有着广泛的应用。目前,生产磷酸的工业方法主要有三种：湿法磷酸、热法磷酸、窑法磷酸,各种磷酸制备的工业方法都存在着不同的原料适应性、能耗水平、环境影响和产品纯度。本课题研究力图探寻一种原料适应性广、能耗水平较低、环境影响小和产品纯度高的磷酸制备新工艺-高炉法磷酸工艺，利用焦炭（或无烟煤）为燃料,磷矿和熔剂为原料，在高炉中高温熔融，磷矿中的磷元素以单质磷蒸气形式【英文摘要】Thephosphoricacidisabasicstockofphosphoruschemicalproductinth

2、epreparationoffinephosphateandphosphoricacidcompoundfertilizer,andsoonhasawiderageofapplicationsintheindustry,agricultureandthenationaldefensewarindustryaswellasthecutting-edgeelectron.Currently,industrialphosphoricacidproduction,therearethreemainmethods:aqueousmethodphosphoricacid,electrothermicsph

3、osphoricacid,kilnlawphosphoricacid.Avarietyofphosphoricacidpreparationmethodshavetheirrawmaterialsadaptable,levelofenergyconsumption,environmentalimpactandproductpurity.Theresearchseekstoexploreawideadaptabilityofrawmaterials,lowlevelofenergyconsumption,lessenvironmentaiimpactandhighpurityphosphoric

4、acidnewtechnology-phosphoricacidbyblastfurnaceprocess,usethecoke(oranthracite)asfuel,phosphaterockasrawmaterialandflux,hightemperaturemeltinginablastfurnace,elementalphosphorusrestoreinasteamformformphosphaterock,meanwhilemeltpreparationofphosphorusinthewaterquenchcondensingtheamountofnutrients(sili

5、con,calcium,magnesium)fertilizer,separationofrareorpreciousmetals(nickel,titanium)andsoon,Therefore,thisresearchforachievingPresources,especiallylow-gradephosphorusresourcescomprehensivereasonableutilization,therearehaveacertainsignificanceforraisingthephosphoricacidindustrialtechnologylevel.Maincon

6、tentsandconclusionsareasfollows:(1)Analysisthesinglefactorphosphatereduction(reductiontime,reductiontemperature,siliconalciumratio)onthereductionrateofphosphaterock.,Determinethepreferentialreductionofphosphaterockconditions.Theresultsshowedthatreactiontemperatureisanimportantfactortothephosphatered

7、uctionrateinthephosphaterockreductionprocess.Thehigherthetemperaturethefasterreduction,achievethesamereductionrate,theshorterthetimerequired.Thansiliconalciumratioisalsoanimportantfactor,withtheincreaseofsiliconalciumratio,alsoincreasedthereductionrate.Considerthereductionrateandpreparatecertainsili

8、conalciumratio,sotheamountofsilicatobeadded.Webelievethatthesiliconalciumratioselectedpreferablybetween0.8and1.0.Phosphaterockratechangeverysmallwhenthereactiontimeat1200°C,however,whenincreasingthetemperatureto1300C-1500C,phosphatereductionratewiththereactiontimeisrelativelylarge,andhasacertai

9、nregularity.(2)Analyzethechemicalcompositionofslaginthemeltingpointoftheslag,comprehensiveanalysisandselecttheNaClandKC1asaflux.ThroughresearchofaddingNaClandKC1afterthereductionrateofPhosphaterock,theyarebothconducivetothepromotionofphosphaterockreductionrate,KC1asafluxismoreobviousthanNaClasaflux,enhancetherangeofabout1%to10%;Highdosage(10%)orlowdosage(5%)didnotsignificantlyincreasephosphaterockreductionrate,addtheamountof5%to7%forthebest.(3)Discussreductionofphosphaterockreactivityandreductionmechani