f、k、na对包钢铁矿粉烧结基础特性影响的研究

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1、内蒙古科技大学硕士学位论文摘要本文从烧结过程自身精料的角度出发研究氟钾钠对包钢铁矿粉液相流动性铁酸钙生成特性和粘结相自身强度等烧结基础特性的影响首先采用微型烧结装置对8种不同氟含量的白云鄂博混合铁精矿进行了烧结基础特性的实验研究结果表明氟能使液相的表面张力减小明显降低液相的粘度液相流动性指数随氟含量的增加先升高后下降在氟含量为0.90%时达最高值白云鄂博铁精矿的铁酸钙生成能力低随氟含量的增加烧结矿矿相中磁铁矿减少赤铁矿增多铁酸钙和硅酸二钙的数量减少枪晶石的数量增多烧结矿宏观上呈现薄壁多孔结构微观上形成以枪晶石为主粘结相多种矿物共存结构粘结

2、相自身强度随氟含量的增加呈下降趋势在氟含量超过0.70%以后氟含量对粘结相自身强度的影响幅度不大其次在掌握氟对包钢铁矿粉烧结基础特性影响的基础上稳定氟含量在0.40%左右改变铁矿粉的钾钠含量探究氟钾钠对包钢综合铁精矿烧结基础特性影响的交互作用机理实验表明K2ONa2O能和矿粉生成低熔点液相并且能抑制硅酸盐玻璃聚集成团在有氟存在的情况下这种作用更为显著液相流动性指数随KNa含量的增加先升高后下降并在KNa含量为0.80%时达最高值包钢综合铁精矿的铁酸钙生成能力很低能谱分析仅观察到微量铁酸钙的存在粘结相自身强度随KNa含量的增加先升高后下降并

3、在KNa含量为0.40%时达最高值本课题有助于完善包钢特殊矿的烧结理论改善烧结矿质量优化烧结工艺过程为开发优质高产廉价的烧结矿生产技术提供科学依据关键词氟钾钠烧结基础特性1内蒙古科技大学硕士学位论文AbstractFromtheaspectofbeneficiatedburdenmaterialincourseofsintering,theinfluenceofF,KandNaonsinteringbasiccharacteristicsofBaogangironorewerestudiedinthispaper,whichinclude

4、dliquidphasefluidity,generationofSFCAandself-intensityofbondingphase.Firstly,thesinteringbasiccharacteristicsofeightkindsofBaiyuneboironoreswithdifferentFcontentareinvestigatedbyamini-sinteringtestdevice.ItwasfoundthatFcanlowersurfacetensionandviscosityofliquidphaseobviou

5、sly.ThefluidityindexofliquidphaseincreasesinthebeginninganddecreasesafterwardwithincreaseofFcontent,andreachthepeakvaluewhenFcontentis0.90%.ThegenerationofSFCAofBaiyuneboironoreispoor.WithincreaseofFcontent,themagnetiteinsinterreduce,buthaematiteincrease;SFCAanddicalciums

6、ilicatereduce,butcuspidineincrease.ThesintershowsThin-walledporousonthemacrostructure,andcuspidineasthemainbondingphaseandmanymineralcoexistonthemicrostructure.Theself-intensityofbondingphasedescendwithFcontentincrease.WhenFcontentexceed0.70%,theinfluenceofFcontentonself-

7、intensityofbondingphaseisnotobviously.Secondly,onthebasisofmasteringtheinfluenceofFonthesinteringbasiccharacteristicsofBaiyuneboironore,theinteractionofF,KandNaonthesinteringbasiccharacteristicsofBaogangironorewereinvestigatedbychangingthecontentofNaandKunderthecontentofF

8、is0.40%.ItisshowedthatK2OandNa2Ocanproducelow-meltingliquidphasewithironore,andpreventsilicategl