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正确选择过滤板,提高铝熔体洁净度Thecorrectchoiceofceramicfoamfilter,improvingthecleanlinessofmoltenaluminum.(1)选择泡沫陶瓷过滤板首先应根据铝熔体中的含杂质量、熔体转注流量和铸造铝制品的品质要求而定。铝熔体含杂质量多,对铸造制品的品质要求一般,则可选用孔网眼较大的泡沫陶瓷过滤板,在过滤板前增设一道玻璃丝布进行粗过滤。在这种情况下半连续铸造铝熔体时先用玻璃丝布粗过滤是重要的,它可以拦截开炉眼时流出的炉渣和流槽上冲刷下来的渣子,以防止过滤板被堵塞。Selectionofceramicfoamfiltershouldbeaccordingtotheimpuritiescontaininginaluminummelt,Furnaceflow,andthequalityrequirementsofcastingaluminumproducts.Theimpuritycontenthigh,thecastingproductqualityrequirementslow,youcanchooselargeholeceramicfoamfilter.Beforetheceramicfoamfilter,youcanaddaglassfiberfilterforcoarsefiltration,Itcanblocktheslagfromfurnaceandlaunder.对铸造制品的品质要求高时,则选用孔网眼小即目数大的新一代泡沫陶瓷过滤板,例如福建瑞闽铝业公司和南方铝业公司生产铝箔坯料,河南明泰铝业公司生产高品质的热轧板坯,东北轻合金加工厂生产高品质的军品铝材,广东中山和胜铝业公司生产高品质工业铝型材时,均采用河南艾文斯生产的新型泡沫陶瓷过滤板,如果选用进行双级过滤,铝熔体更能达到理想的洁净度。Ifthecastingproductqualityrequirementsarehigh,largemeshsmallholeceramicfoamfiltershouldbechoose.Forexample,FujianRuiminAluminumIncandSouthAluminumIncwhichproducealuminumfoil,ProductionofhighqualityhotrolledslabinHenanMingTaiAluminumInc,Theproductionofhigh-qualitymilitaryaluminumfromNortheastLightAlloy,productionofhighqualityindustrialaluminumprofilesfromZhongshanandAluminumIncinGuangdong,TheyallchooseAdTechHenannewgenerationceramicfoamfilterfordoublefiltration.MoltenAluminumcanachievethedesiredcleanliness.过滤板规格的选择是按铝熔体单位时间通过的流量和铝熔体总通过量而定的。流量大和总通过量大,过滤板孔眼小,则选用较大规格的过滤板。Ceramicfoamfiltersizeselectwillbeaccordingtothealuminummeltunittimethroughtheflowandthetotalamountofaluminummelt.Thetotalflowlargewithsmallholefilter,filtershouldchooselargesize.选择过滤板也应观其色,拍其体,烧其物。过滤板的颜色纯而无杂,说明材质均一;扎手而不粘手,说明表面没有喷粘结剂,不会造成铝液二次污染。单手托着过滤板,另一只手以鼓掌式适力拍打过滤板,连续掉下陶粒,则是劣质过滤板,会造成铝液二次污染。用明火或电热升温将过滤板烧为红色,立即室温冷却无崩裂掉渣,则是好的过滤板。Purchaseceramicfoamfiltershouldalsoviewitscolor,clapthebody,burnthematerial.Thecolorofthefilterboardispureandnoimpurity,whichshowsthatthematerialisuniform.Prickthehandbutnotsticky,nosprayadhesivesurface,whichwillcausesecondpollutionofliquidaluminum.Toomanyfloatingdustisnotgood,useflameorelectricheatingburnfilterbecomingred,immediatelycoolingatroomtemperaturewithoutcrackingresiduewillbegoodqualityceramicfoamfilter.选购过滤板时应认真评估其泡沫体的有效比表面积或孔隙率。可以观察过滤板表面层网眼均匀状况,再将其剖开观察断面的网眼均匀状况。有条件的话,可以用排水法测量计算出其孔隙率。如果三维网眼均匀,孔隙率相对较大则是优良的泡沫陶瓷过滤板。Theeffectivespecificsurfaceareaandporosityofthefoamshouldbecarefullyevaluatedintheselectionoffilterplates.Wecanobservethefilterplatesurfacelayerofuniformmeshcondition,andthencuttheCFFforsectionobservation.Ifthereisacondition,itcanbemeasuredbydrainagemethodtocalculateitsporosity.Ifthe3Dmeshuniform,theporosityisrelativelyhigh,thefilterwillbeexcellentlikeAdTechceramicfoamfilter.