Overview
Redbricksarealsocalledclaybricks.TheredbricktechnicallabelisgenerallyNo.75toNo.100.Thesizeofordinaryfiredbrick(redbrick),alsocalledstandardbrick,is240*115*53.(Unit:mm)Thecolorisred,sometimesdarkblack.Ordinaryclaybricksnotonlyhavecertainstrengthanddurability,butalsohavecertainadvantagessuchasheatpreservation,heatinsulationandsoundinsulationduetotheirporosity.Therefore,itissuitableforuseaswallmaterials,andcanalsobeusedformasonrycolumns,arches,chimneys,groundsandfoundations.Old-fashionedbuildingsuseitasabuildingmaterial.InventedbytheancientRomans,theroofsandwallsofmanyremainingclassicistbuildingsinEuropehavetheshadowofredbricks.
Formation
Intheproductionofbricks,alargefireisgenerallyusedtoburnthebricksinsideandout,andthenextinguishthefiretoallowthekilnandbrickstocooldownnaturally.Atthistime,theairinthekilniscirculatedandoxygenissufficient,formingagoodoxidizingatmosphere,sothattheironelementinthebricksisoxidizedtoirontrioxide.Sinceirontrioxideisred,itwillalsoappearred.Ifthebricksarefullyfired,wateriscontinuouslypouredintothekiln.Atthistime,duetothehightemperatureinthekiln,thewaterwillquicklyturnintosteam,whichwillpreventthecirculationofairandcreateanoxygen-deficientenvironmentinthekiln.Theirontrioxideinitisreducedtoferrousoxideandexistsinthebrick.Sincetheferrousoxideisblue-gray,thebrickwillbeblue-gray.
Traditionalprocess
Theprocessflowofredbricksproducedbyvariouscompaniesinvariousplacesissimilar,andgenerallygoesthroughthefollowingprocesses:
Theprocessflowchartisasfollows:
p>Rawmaterialmining
↓
Open-airstackingandweathering→Materialwarehousestorageinrainyweather
↓
Internalcombustionpulverizedcoalslag
↓
Coalblender
↓
Crusher
↓
DrumScreening
↓
Agingsiloaging
↓
High-speedfinecrushingrollermachine
↓
Mixer←Addwater
↓
Vacuumextruder
↓
Cuttingmachinecuttingstrips
p>↓
Cuttingmachine
↓
Fullyautomatichydrauliccodebrickmachinecodekiln(ormanualcodebrick)
↓
Dryingandfiring
↓
Thefinishedproductispalletizedoutofthekiln
Moderntechnology
IndustrializationTheproductionofredbrickshasbasicallyachievedmechanizationandautomation.Formodernmanufacturers,theprocessflowisusuallyasfollows:
Rawmaterialsupplyandprocessing
Theminedrawmaterialsarestackedandaged,Thenuseaforklifttojointhechain-platefeeder,anduseabeltconveyortosendittotherollermachineforcrushing.Theinternalcombustionpulverizedcoalslagisalsosenttotherollermachinewiththemudthroughthebeltandmixedandcrushedbythedrumscreen.Afterthesieve,thecoarsematerialonthesieveissentbackandrepeatedlycrushedbythebeltconveyor.
Moldingandfiring
Theprocessedrawmaterialsaresenttothevacuumextruderthroughabeltconveyor(theextrusionpressureofthemachinereaches3.5Mpa,whichcanensurethattherawmaterialsareatahighItisextrudedunderthepressureofhighpressure,sothatthemoisturecontentofthegreenbodyislower,whichisbeneficialtoensurethedimensionalaccuracyofthegreenbodyandthestrengthofthegreenbody,soasnottodeformthegreenbodyduringmechanicalcoding).Twisting,squeezingandcuttingmaketherawmaterialparticlesmoredenseandmoisturemoreuniform.Inthevacuumchamber,avacuumpumpisusedtoextracttheairinthespacebetweentherawmaterialparticlesandtheparticles,whichincreasestheextrusiondensity,improvesthepressureresistanceandflexuralresistanceoftheproduct,makesthesurfaceoftheproductsmoother,andimprovestheyield.Thenthroughthelowerstageofthevacuummachine,therawmaterialsareagainextrudedbythespiralreamer,andtheformedbilletsarecutintovarioustypesofbilletsbytheautomaticcuttingbilletsystem,andthencodedtothekilncarbythehydraulicautomaticbilletingsystemItisthentransferredtotheroastingkilnthroughanelectriccarriage,andthenpushedintothekilnbythejackingmachineaccordingtothespecifiedprocesstime,andthendriedandfiredinonetime.