Mill shell lining - Christian Pfeiffer

The grinding process usually takesplace in ball or tube mills which,due to their simple principle, arewidespread throughout the worldand require only low maintenanceefforts.The rotary movement of the millshell causes the grinding media(cast steel balls) to rise, fall or rollonto the material to be groundwith high impact or pressureenergy and thus performs thecomminution.

Lining systemsfor tube millsTube or ball mills are horizontalshells in which charged balls ofvarying sizes “smash“ the materialpassing through by im pactenergy.The mill shell is fitted with aninner lining to protect the millcylinder: A lining consisting ofhigh ly wear resistant sectionalplates serves as protection againstwear. Besides the protection ofthe mill tube, the lining also hasthe task of improving the liftingand flow of the balls due to theparticular shape of the individualplates. Different heights andthe layout of the individual wearplates ensure the correct distributionof the trail of balls and reducethe relative movement betweenthe balls and the lining.Mill shell liningin the first chamberMill shell liningin the second chamberNEU UND ABGEFLACHTLining types

Modified shape improvesthe efficiency of the millDirection ofrotationConventional designWave profileProgressive lifterChristian Pfeiffer is not only themanufacturer of the lining systems,but also applies to the pro ceduralflows in the grind ing unit. Ourknow-how puts us in aposition to positivelyinfluence the grindingprocess dueto the modifiedshape of thesegments andthus im prove theefficiency of agrinding systemwhile minimisingwear.Lifting effect and slippage of the ball chargeConsistent grindingefficiency throughoutthe operationConventional design: Decreasinghub height from the first operatinghour onwardsCP-Design: Constant height of lifterthrough-out the entire service lifeIn comprehensive test series,Christian Pfeiffer has optimisedthe shaping of the progressivelifter to such an extent that theball charge ensures optimumcomminution of the material tobe ground. The shape of the lifteris retained throughout its servicelife; therefore the grindingefficiency remains consistentduring the entire runnig time.

Fastening systemsAs a specialist in linings for ballmills, Christian Pfeiffer can offerany fastening system required.All li nings are tailor made to therequirements of your mill.The fastening systems describedbelow are standard:A bolted faste ning requires adrill hole in the mill cylinderfor each plate. The systemis easy to operate and can beinstalled without the assistanceof Christian Pfeiffer specialists.With a semi-bolted fasteningoption, at least two rows ofplates are bolted. Specialtools are needed forinstallation; in this case it isrecommend ed to haveChristian Pfeiffer staff on siteto supervise the installationof the system.Fastening systems

Secure data forinvestment decisionsChristian Pfeiffer will alwaysprovide you with secure outputdata for your investment decisionssince we determine all necessaryparameters for the successfuloperation of your grinding systemin semi-industrial tests.In addition, our Research andDevelopment team applies itself tothe new and further improvementof machines, components andprocedures. The extent of ourexperts’ success in this field hasalready often been proven overthe past few dec ades, and theresults of their efforts have oftenbecome milestones in the developmentof modern grinding systems.To meet the requirements ofour internatio nal customers,our quality assurance systemhas been certified since 1994.Stages Innovation of productionand R&D

Successful start afteroverhaul of millWhen the new lining system hasbeen installed, the mill must beopti mised. Optimisation is carriedout step-by-step in accordancewith the recommendations of ourspecialists. The mill is first chargedwith 80 % of the calculated grindingmedia and continually operatedwith material. To examine thegrinding progress, the mill is subjectedto an emergency shutdownand material samples are takenfrom along the mill axis. A grindingdiagram can now be created on thebasis of the particle size distributionanalysis. The mill is then filledwith grinding media up to theoptimum operating charge for thenormal operation of the mill. Foroptimisation it is also necessary toconsider the influencing parametersof the entire grinding system.Systematic evaluations and manyyears of practical experience onthe part of our engineers guaranteethat every mill can be adjustedto meet your requirements.Particle size distribution by fractionsDistribution of particle size by fractionsReplacement and service