简介:铜精炼生产电铜过程中,净化工序产生大量含砷锑铋的黑铜渣,本研究采用加碱湿磨后固砷焙烧,使黑铜渣中的砷与碱生成易溶于水的砷酸钠,在水浸脱砷工序中进入溶液;水浸液中的砷加石灰生成砷酸钙沉淀填埋;脱砷后滤液含碱高、含砷极低,可部分返回循环使用;其它返铜盐厂沉镍工序替代一部分纯碱使用;滤渣进行硫酸浸出,酸浸液可用作生产铜盐产品;硫酸浸渣用于提取锑、铋、银。整个工艺过程铜回收率达到99.6%,砷脱出率达到98%以上,95%以上的锑和98%以上的铋进入渣中,酸浸时通过加入微量氯根,98%以上的银也进入酸浸渣里,综合回收了黑铜渣中的铜、银、锑、铋等有价金属。
简介:High-strengthpipelinesteelandlargediameterlinepipesareoftenusedtoincreasethecapacityoftransportationandreducethecostassociatedwiththeconstructionandoperationoflong-distancegaspipelineprojects.China’sinitiativestoconstructlong-distancenaturalgaspipelineshasbroughtinnewopportunitiesforthedevelopmentofX80linepipes.BaosteelhasdesignedtheoptimumchemicalcompositionofX80withhighniobiumandlowmolybdenumcontent.Inaddition,aweldingexperimentalplatformandafiniteelementmodel(FEM)havesupportedthedevelopmentofX80UOEpipesinanefficientandeconomicalway.TheapplicationandrecentdevelopmentofX80UOEpipeswereintroducedinthispaper.TocomplywiththerequirementsoftheSecondWest-EastGasPipelineProject(2ndWEPP),X80pipelinesteelwithlowcarbonbainitemicrostructurewasdevelopedbyutilizingtheoptimizedcompositionandTMCPprocess.Thematchingweldingmaterial,weldingprocedureandUOEformingprocessesfor1219mmoutsidediameterX80UOEpipeswerealsodeveloped.Morethan340000tofX80UOEpipeswereproducedandappliedinthe2ndWEPP.Furthermore,tomeettheprospectivedemandforlong-distancegaspipelineswithanannualtransportationcapacityofover40billionm3,largersizeX80UOEpipeswith1422mmOD×30.8mmWTweretrialproducedrecently.DWTTperformance,themaintechnicalchallengeforheavierwallpipes,wasimprovedbyusingoptimizedmicrostructuraldesign.ThenewlydevelopedX80pipescanbepotentiallyusedforlargertransportationcapacitypipelinesinChina.
简介:用溶胶-凝胶法制备镍锌共掺杂Z型锶钴铁氧体Sr3(NiZn)xCo2(1-x)Fe24O41(x=0~0.5)粉末。用X射线衍射(XRD)和扫描电镜(SEM)表征该铁氧体粉末的晶体结构和表面形貌,并测试其室温磁滞回线和室温电阻率。用微波矢量网络分析仪测定该粉末在2~18GHz微波频率范围的复介电常数和复磁导率,根据测量数据计算电磁损耗角正切及微波反射率,分析该材料的微波吸收性能与电磁损耗机理。结果表明:Sr3(NiZn)xCo2(1-x)Fe24O41粉末呈六角片状形貌,晶体结构为Z型,具有良好的软磁特性;x=0.3时该材料的电阻率最低,微波吸收效果最好,在13.5GHz频率的吸收峰为25.1dB,10dB频带宽度为7.7GHz,兼具强的磁损耗和弱的介电损耗。