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PostPosted: Mon 13:46, 01 Nov 2010    Post subject: ugg boots günstig 生物&#280

生物浸出磁黄铁矿的研究概况
的变化,加大了高铁低硅粉矿的配比,烧结矿铁品位不断提高,而粉矿中的含铁矿物以Fe203为主,ugg boots günstig,导致烧结矿中Fe203含量较高,boots uk,而Fe203在低温还原时,由于Fe203晶格向Fe304晶格变化时,将引起大约20%的体积膨胀,同时烧结矿中SiO2、MgO、及FeO含量则逐步下降,使得安钢烧结矿RDI指标逐年降低,RDI一3.15达45%左右,影响到了高炉的稳定顺行和技术经济指标的提高。安钢烧结厂为了既要提高烧结矿的还原性。又要降低RDI,于2004年元月开始,在成品烧结矿表面喷洒CaC12溶液,使RDI一3.15比未喷洒前降低了10%以上。由于RDI指标的改善,ugg boots sale,烧结矿在高炉内的低温还原粉化率降低,有利于高炉料柱的透气性,ugg boots sale,较好地满足了高炉冶炼的要求。3进一步改善烧结矿质量的建议近年来,安钢新烧结系统通过采取一系列有效措施,使烧结矿质量有了显著的提高,但较国内、外一流水平,还有一定差距,因此在今后的工作中,仍需进一步提高烧结矿质量。(1)加强对原料烧结性能的研究。目前,安钢使用的原料品种多,性能差别大,有必要对各种原料的烧结性能进行研究,并进行优化。(2)料层透气性有待进一步提高安钢新烧系统料层提高到600ram以后,烧结机料层负压达16.5~17kPa,ugg boots deutschland。有时高达18kPa。若要进一步提高烧结料层,则需进一步改善烧结料层透气性。如加强对瓦斯灰,除尘灰等难处理物料成球性的研究。(3)在烧结混合料中加入强化剂,进一步提高烧结矿的强度。4结语近年来,安钢烧结系统通过不断提高烧结矿品位,强化原料的混匀,采用小球烧结技术,实行厚料层低温烧结,改善烧结矿粒度组成,改善烧结矿的冶金性能等措施,使烧结矿质量不断提高,为高炉提高技术经济指标创造了有利条件。参考文献:[1]翁得明.高品位优质烧结矿的研究[C]//中国金属学会.2002年全国炼铁生产技术会议暨炼铁年会文集.2002:397―402.[2]张永中.碱度、SiO2及MgO含量对烧结矿质量的影响[J].烧结球团,2001(5):47―49.[3]周取定.高炉炉料结构译文集[M].北京:冶金工业出版社,1987.(上接第56页)[17]YakhontovaLK,NesterovichIG..Roleofbacteriainasupergeneprocessinoredeposits[J].MineralZh,1982,4(1):3―9.[183方兆珩,柯家驹,李洪枚,等.生物浸出低品位镍铜硫化矿[J].有色金属(冶炼部分),2002,4:2―8.[19]QiuGuan-zhou,QinWen.qing,LanZhuo-yue,eta1.Elec.tirecultureofbioleachingonpyrrhotite[J].TransactionsofNonferrousMetalSocietyofChina,2003,13(1):175一l79.[20]ScharerJM,ByerleyJJ,KwongE.Roleofbiologicallyassistedpyrrhotiteoxidationinacidminedrainage[J].Biohydro-metalITechnology,1993,2:255―265.[21]NiemelaSI,Riekkola.VanhanenM,SivelaC,eta1.Nu.trienteffectonthebiologicalleachingofaBlack-Schistore[J].AppliedandEnviron.mental,1994,60(4):1287一l291.
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