CAJ | 학술논문

为了解采用可燃性废弃物作为替代燃料煅烧水泥熟料时产生的气氛对水泥窑烧成带用方镁石－复合尖晶石砖的侵蚀情况，首先进行了化学试剂 V2 O5分别与高纯镁砂和镁铝尖晶石砂在1500℃下的反应试验；然后以高纯镁砂、高铁镁砂、铁铝尖晶石砂为原料，于1600℃烧成制备了方镁石－复合尖晶石坩埚试样，按水泥熟料、橡胶轮胎、石油焦的质量分数分别为50％、25％、25％配成侵蚀介质，采用静态坩埚法进行了替代燃料对方镁石－复合尖晶石材料的侵蚀试验（1450℃保温3 h）。利用 XRD 检测了试样的物相组成，采用 SEM观察和分析了气氛侵蚀后试样的显微形貌。结果表明：1）V2 O5与 MA 中的 MgO 反应产生刚玉相和钒酸镁，破坏了尖晶石结构，并伴随较大的体积膨胀而破坏了砖的结构。因此，在水泥窑使用替代燃料的情况下，方镁石－复合尖晶石砖中不适合加入镁铝尖晶石。2）替代燃料燃烧产生的 SO3、V2 O5等酸性气体沿着气孔和晶界向砖内扩散，在气孔和晶界处聚集，与方镁石－复合尖晶石材料中的 CaO、MgO 反应生成 Ca3（VO4）2、Mg3（VO4）2、CaSO4、MgSO4，产生体积效应，不利于材料的稳定；另外还与水泥熟料中的 C2 S 反应生成 CaSO4和低熔点相，不利于窑皮的稳定。
위료해채용가연성폐기물작위체대연료단소수니숙료시산생적기분대수니요소성대용방미석－복합첨정석전적침식정황，수선진행료화학시제 V2 O5분별여고순미사화미려첨정석사재1500℃하적반응시험；연후이고순미사、고철미사、철려첨정석사위원료，우1600℃소성제비료방미석－복합첨정석감과시양，안수니숙료、상효륜태、석유초적질량분수분별위50％、25％、25％배성침식개질，채용정태감과법진행료체대연료대방미석－복합첨정석재료적침식시험（1450℃보온3 h）。이용 XRD 검측료시양적물상조성，채용 SEM관찰화분석료기분침식후시양적현미형모。결과표명：1）V2 O5여 MA 중적 MgO 반응산생강옥상화범산미，파배료첨정석결구，병반수교대적체적팽창이파배료전적결구。인차，재수니요사용체대연료적정황하，방미석－복합첨정석전중불괄합가입미려첨정석。2）체대연료연소산생적 SO3、V2 O5등산성기체연착기공화정계향전내확산，재기공화정계처취집，여방미석－복합첨정석재료중적 CaO、MgO 반응생성 Ca3（VO4）2、Mg3（VO4）2、CaSO4、MgSO4，산생체적효응，불리우재료적은정；령외환여수니숙료중적 C2 S 반응생성 CaSO4화저용점상，불리우요피적은정。
This paper aims at researching the produced atmosphere corrosion during the calcination of ce-ment clinker using combustible wastes as substitute fuels to periclase-compound spinel bricks for burning zone of cement kilns.Firstly,chemical reactions between V2 O5 and high purity magnesia or magnesium alu-minate spinel at 1 500 ℃ were researched.Secondly,periclase-compound spinel crucible specimens were prepared at 1 600 ℃ using high purity magnesia,ferruginous magnesia,and hercynite as raw materials;the corrosion medium was prepared using 50% cement clinker,25% rubber tyre and 25% petroleum coke;the static crucible corrosion tests were carried out at 1 450 ℃ for 3 h.The microstructure and phase composition of the corroded specimens were analyzed by SEMand XRD,respectively.It is found that (1)V2 O5 reacts with MgO from spinel forming corundum and magnesium vanadate accompanied by a large volume expansion, deteriorating the spinel structure,thus damaging the brick structure,so when the substitute fuels are used for cement kilns,magnesium aluminate spinel is not a suitable raw material for periclase-compound spinel bricks;(2)the produced acid gases such as SO3 and V2 O5 during the combustion of alternative fuels pene-trate into the bricks along pores and crystal interfaces,gather in pores and crystal interfaces,react with CaO and MgO from periclase-compound spinel bricks forming Ca3 (VO4 )2 ,Mg3 (VO4 )2 ,CaSO4 and MgSO4 ac-companied by volume effect,which is disadvantage to the brick stability;additionally,the acid gases react with C2 S forming low melting phases and CaSO4 ,which goes against the stability of kiln coating.