Technology for Reject Treatment and Recovery ATREX® G-series provides a highly efficient, flexible and compact process to treat the reject flows from the paper and boars machines. This reject flow, which contains valuable minerals and fibers, can amount from 1 up to even 4% of the total tonnage of the paper or board production line, and is in many cases hauled to the landfill. With the ATREX® system most of the valuable minerals and fibers can be recovered and reused in the process. MORE THAN 95% OF THE REJECT STREAM RECOVERED BACK TO PROCESS FAST RETURN ON INVESTMENT SAME PROCESS CAN BE USED TO RECOVER CLEANER REJECT, SCREEN REJECT AND COATING EFFLUENT STABLE OPERATION COMPACT AND DURABLE PROCESS DESIGN PRE-ASSEMBLED AND SKID MOUNTED. EASY TO INSTALL ENVIRONMENTALLY FRIENDLY ACCEPT Rejectfrom finalcleaner stage Accept recirculation to2ndstage DILUTION WATER FEED DILUTION & FLUSHWATER ATREX DISPERSER DILUTION TANK Electron microscope pictures of Cleaner Reject (left) and Accept from the Atrex process (right). FINAL REJECT VALUABLE RAW MATERIALS ECONOMICAL CONSIDERATIONS Thecleanerrejectconsistsofvaluablerawmaterialsthatcanbe reusedintheprocessaftertreatingthemwithATREX®.Especially thepaperandboardmillsproducingcoatedgradeshavealot ofcoatingflakesintheircurrentrejectstreams.Theheavierthe coatingisthemorediffi cultisdeflakingwithexistingmachinery. Doublecoatedgradesorcoatedboardaregoodexamples. Whenanalysingtheeconomicalimpactofthisprocessforthe mill,onehastotakeinaccountthevalueoftherecycledraw materialsandthesavingsofthetransportationoftherejectand thechargesforlandfilling.Typicallytheseconsiderationsleadto apaybacktimeof6to12months. PRESENT STATE OF THE DEVELOPMENT Whentherejectstreamisstudiedmorecarefully,onecandetect fractionsfromfillers,coatingflakes,residuesfromfurnishlike fiberknotsorshivesandcontaminantslikesand. WhenthisstreamisprocessedwithATREX®thetargetistoreach theoriginalparticlesizedistributionofcoatingpigmentsand fillers.Atthesametimefiberknotsaredisintegratedandshives grinded.Ithasbeenshownthatallthefibersandmorethan 95%ofthetotalrejectstreamcanberecoveredbacktoprocess. Thepigmentworksasfillerandtheuseofnativefillercanbe subsequentlyreduced. InthisprocessATREX®unitwithanadditionalcleaneris installedafterthelast,typicallythe6thcentrifugalcleanerstage. Theacceptoftheadditionalcleanerwillbereturnedtothe 2ndstagefeedandthereducedamountofresiduewillbethe finalreject.Seeflowsheet. TheATREX®processhasbeendevelopedandrunatextensive trialsatanumberofpaperandboardmills.Thefirstunitswere installedandstartedupinearly1999.Over50unitsarerunning worldwide.ThereareATREX®unitsavailabletocovercapacities upto100cubicmeters/h.Wecanoffertrialrunsatthecustomer’smillwiththetransportablepilotunits. CONCLUSIONS TheATREX®RejectRecoveryProcessisanenvironmentally soundprocesstotreattherejectflowfromthefinalstageofapproachflowcentrifugalcleaners,papermachinescreenrejects andcoatingcoloureffl uents.Theprocessnotonlyreducesthe amountofwastes,itturnsthemintovaluablerawmaterials. Technical Specifications Application:RejectRecoveryProcess Cleaner Atrex G-Series Rotor Dia.mm MotorPower, kW(1500rpm) Capacity Flow,I/s Capacity Consistency,% CD500G CD650G CD700G 500 650 700 1x30…75 1x90…200 1x250…400 0,5–5 3–8 5–15 0,5–15 3–20 5–20 www.megatrex.com Telinetie9 FI-33880Lempäälä,Finland Albia500FRB Cleanpac700FRB Cleanpac270SR Cleanpac700/700LD CellecoTwister Capacity, I/min atPressure Drop,kPa 500 630 360 630 630 120 150 150 150 175 Tel.+35832661080,fax+35832661980 [email protected]
© Copyright 2024 ExpyDoc
