Red brick



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:

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Rawmaterialmining

Open-airstackingandweathering→Materialwarehousestorageinrainyweather

Internalcombustionpulverizedcoalslag

Coalblender

Crusher

DrumScreening

Agingsiloaging

High-speedfinecrushingrollermachine

Mixer←Addwater

Vacuumextruder

Cuttingmachinecuttingstrips

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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.

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