科技文献检索冶金工程.pdfVIP

高碱度内配煤含铁团块自还原过程中脱硫和脱磷

李强

河北联合大学轻工学院材料化工部

摘要:以转炉除尘灰、高炉瓦斯灰和硫酸渣为含铁原料,制成CaO/SiO2值

为2.0、C/O摩尔比为1.1~1.2的高碱度内配煤含铁团块,在1330~1380度度

下进行自还原,研究这一过程的脱硫和脱磷规律.结果表明:(1)高碱度内配

煤含铁团块自还原过程中,通过还原气化脱硫可去除20%~40%的硫,其余的硫

绝大部分存在于渣中,并通过渣铁分离被去除,总脱硫率高于97%.(2)过量的

CaO可以抑制脉石中的P2O5被碳还原,已被还原的磷一部分被新生态的金属铁

吸收,另一部分从团块内部逸出而去除.脉石中未被还原的P2O5最终可通过渣

铁分离被去除,总脱磷率达到50%~60%.(3)高碱度内配煤含铁团块高温自还

原法可制备出低硫、低磷的纯净金属铁粒.

关键词：铁;直接还原;脱硫;脱磷

分类号TF03+1

Desulfurizationanddephosphorizationduringself-reductionof

high-basicitycoal-bearingironoxidebriquettes

QiangLi

QinggongcollegeHebeiUnitedUniversity

ABSTRACTHighbasicitycoalbearingironoxidebriquetteswithaCaO/SiO2of

2.0andaC/Omolarratioof1.1to1.2,whichwereproducedbyBOFsteelmaking

sludge,BFdedustingashandpyritecinder,wereself-reducedattemperaturesfrom1

330度to1380度tostudythephenomenaofdesulfurizationanddephosphorization.

Duringtheself-reduction,thedesulfurizationratiobyevaporatingasCOSis20%to

40%.Residualsulphurisattachedinslaganditcanbeseparatedfromironnuggets.

Thetotaldesulfurizationratioismorethan97%.ExcessiveCaOinhighbasicitycoal

bearingironoxidebriquettescanrestrainthereactionofphosphorouspentoxide

reducedbycarbon.Thereducedphosphorousispartiallyabsorbedbynascentme

talliciron,andtheotherescapesfromthebriquettes.Phosphorouspentoxideattached

inganguewhichisnotyetreducedcanbeseparatedfromironnuggets.Thetotal

dephosphorizationratiocanreachupto50%to60%.Itisindicatedthatcleaniron

nuggetswithlowsulphurandlowphosphorouscanbeproducedbyself-reductionof

highbasicitycoalbearingironoxidebriquettes.

KEYWORDS：iron;directreduction;desulfurization;dephosphorization

内配煤含铁球团或团块高温自还原制备直接还原铁技术在过去的几十年间

开展了大量的基础研究和技术研