Power

© - ALSTOM 2010. ALSTOM, the ALSTOM logo and any alternative version thereof are trademarks and service marks of ALSTOM. The other names mentioned, registered or not, are the property of their respective companies. The technical and other data contained in this document is provided for information only. ALSTOM reserves the right to revise or change this data at any time without further notice.

Materials Tested

Here are a few of the many materials that have been tested in the Raymond pilot plant testing facility:

Raymond® Roller MillsThe Industry Standard for Over a Century

More than 2,000 Raymond® roller millshave been supplied since the first millswere designed in the late 1800’s. Theseearly machines were the forerunner ofthe heavy-duty rugged ring-roll mills de-signed and manufactured by AlstomPower, Raymond Operations today.The Raymond® roller mill provides theneeded flexibility to economically andefficiently process a wide variety of ma-terials.

Roller Mill SystemThe typical Raymond® roller mill sys-tem is designed to dry, pulverize, clas-sify and deliver a number of differenttypes of materials.

From a feed ranging in size from ap-proximately 10-40mm (1/2” to 11/2”), theroller mill can produce particles rang-ing from coarse, granular products ofapproximately 10%R2000 micron(90% minus 10 mesh) to as fine as0.002%R44 micron (99.998% minus325 mesh). They can also be used toprepare feed for systems producingultra-fine materials, such as aRaymond® vertical mill, ball mill or Jet-Stream™ classifier system.

Cost EfficiencyThe Raymond® roller mill provides ef-ficient control of product size, withminimal power, resulting in cost-effec-tive production. The system offersmaximum flexibility and control overmill variables, delivering controlledproduct quality at minimum operatingcost.

Custom Engineered SystemsEach roller mill system is custom de-signed to achieve the best solutionfor your processing application. Themill feeder, roller mill size, classifier,fan, cyclone, dust collector and othersystem components are selected tomeet the requirements and charac-teristics of the material being pro-cessed.

Principal of OperationThe Raymond® roller mill is an airsweptvertical ring-roll mill with an integral clas-sification system. A vertical shaft ro-tates a “spider” assembly of arms fromwhich are suspended free swingingjournal assemblies with rolls attached.As the unit turns, centrifugal forcedrives the rolls against the inner sur-face of the vertical grinding ring.Plows, rotating with the assembly, lift

feed material from the mill bottom anddirect it between the rolls and thegrinding ring where it is pulverized.

Air enters from below the grinding ringand flows upward, carrying fines to theclassifying section. The classifiersizes the pulverized material and re-turns oversized particles to the grind-ing chamber for further processing. Themill operates under negative pressureconditions, thus minimizing mill main-tenance and plant housekeepingproblems, while maximizing the ser-vice life of major mechanical compo-nents.

ApplicationsA roller mill is most effective process-ing materials that are 5 or less on theMohs scale of hardness. There are afew limitations, but the most practi-cal materials are soft to medium hardmaterials. Ideal applications includevarious clays such as fire clay, ben-tonite and kaolin as well as other min-erals like barytes, gypsum, lime-stone, hydrated lime, phosphate rock,talc and coal. Manufactured materi-als such as pigments, phenolic res-ins or similar materials can also beprocessed in a roller mill system.

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Cross section of a Raymond#73 612 Roller Mill

Power

© - ALSTOM 2010. ALSTOM, the ALSTOM logo and any alternative version thereof are trademarks and service marks of ALSTOM. The other names mentioned, registered or not, are the property of their respective companies. The technical and other data contained in this document is provided for information only. ALSTOM reserves the right to revise or change this data at any time without further notice.

Materials Tested

Here are a few of the many materials that have been tested in the Raymond pilot plant testing facility:

Roll

Journal Assembly

Gear Housing

Raymond® Roller Mills

Journal assembly - forged steelshaft supports a steel journal hous-ing on carrying rings or roller bearings.Roll - cast and machined wear resis-tant steel roll is fastened to the ta-pered lower housing of the journal.Drive gears - cut steel bevel and pin-ion operate in a integral or indepen-dent housing.Base - heavy cast iron mill base ismachined to provide an airtight fit forthe return air housing, gear housingand mill bottom.Bull ring - high carbon forged steelbull ring is keyed to prevent rotationand is held in place by clamps to fa-cilitate replacement.Vertical shaft - cold rolled finishedsteel vertical shaft is engineered tosupport all moving parts.Mill bottom - cast iron mill bottomwith with replacable liners fits into amachined recess in the base.Spider - ductile iron or steel plate iskeyed to the main vertical shaft.Plow support - ductile iron plow sup-port is bolted to the spider assembly.

Integral gear housing - heavy castiron gear housing contains the lowerthrust bearing for the vertical shaft as wellas the bearing for the horizontal shaft.Independent reducers - steel hous-ing contains high efficiency gearingdesigned for maximum flexibility andextended service life.

Factors Influencing CapacityMajor factors affecting the capacity ofany given roller mill include desiredfineness, grindability and initial mois-ture. The capacity of the mill de-creases when fineness increases.The harder a material is to grind, thelower the capacity of the mill. High ini-tial moisture may also decrease millcapacity because of limitations on thedrying capacity of the mill.

The roller mill, when equipped with avariable speed mill drive, can be usedin applications requiring adjustablecapacity. This allows the user tomatch product rate with downstreamprocess requirements, thereby reduc-ing the operating and maintenanceproblems associated with frequentstarts.

Construction Features

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Spider

Bull Ring

Plow

Mill Base

Whizzer Assembly

Rotary Feeder

Power

© - ALSTOM 2010. ALSTOM, the ALSTOM logo and any alternative version thereof are trademarks and service marks of ALSTOM. The other names mentioned, registered or not, are the property of their respective companies. The technical and other data contained in this document is provided for information only. ALSTOM reserves the right to revise or change this data at any time without further notice.

Materials Tested

Here are a few of the many materials that have been tested in the Raymond pilot plant testing facility:

Nominal Capacity of Raymond® Roller Mills-stphlairetaM sseneniF eziSlliM

gnissap% hsem 03 05 45 06 66 37 68

etyraB 09 523 0.2 1.7 8.8 21 91 92 54

etinotneB 08 002 5.2 0.9 11 51 32 73 65

)55=GH(laoC 08 002 7.1 0.6 5.7 01 61 52 83

)55=GH(teP,ekoC 59 002 5.1 3.5 6.6 0.9 41 22 43

DME 58 002 0.1 5.3 4.4 0.6 0.9 51 22

yalCeriF 59 001 5.2 0.9 11 51 32 73 65

muspyG 09 001 2.3 11 41 91 03 74 27

niloaK 8.99 523 6.1 5.5 0.7 4.9 51 32 63

tnruB,emiL 07 523 0.3 11 31 81 82 44 76

detardyH,emiL 99 002 8.2 01 21 61 62 14 36

enotsemiL 59 81 5.2 8.8 11 51 32 73 65

enotsemiL 58 002 0.2 1.7 8.8 21 91 92 54

enotsemiL 99 523 3.1 6.4 7.5 6.7 21 91 92

kcoRetahpsohP 07 002 4.2 5.8 11 41 32 53 45

ruhpluS 09 523 7.1 0.6 5.7 01 61 52 83

claT 08 523 7.1 0.6 5.7 01 61 52 83

edixoiDmuinatiT 79.99 523 5.0 8.1 2.2 9.2 7.4 4.7 11

eziSlliM wolfriA*lanimoN rewoPnaF xam-rewoPlliM rewoPenibruT

ni mm mfca m3 rh/ ph Wk ph Wk ph Wk

03 067 009,3 006,6 03 22 03 22 52 81

05 0721 000,01 009,61 06 54 001 57 03 22

45 0731 006,21 004,12 57 55 051 011 04 03

06 0251 006,51 005,62 001 57 002 061 05 54

66 0761 005,22 002,83 051 011 003 522 57 55

37 0581 000,13 006,25 002 061 006 005 001 57

68 0812 005,64 000,97 003 522 009 007 051 011

Airflow and Power Requirements for Raymond® Roller Mill Systems

*Airflow for many applications will exceed nominal values.

Raymond® Roller MillsRequirements and Capabilities

3

Power

© - ALSTOM 2010. ALSTOM, the ALSTOM logo and any alternative version thereof are trademarks and service marks of ALSTOM. The other names mentioned, registered or not, are the property of their respective companies. The technical and other data contained in this document is provided for information only. ALSTOM reserves the right to revise or change this data at any time without further notice.

Materials Tested

Here are a few of the many materials that have been tested in the Raymond pilot plant testing facility:

Cyclone Collector

Roller Mill

System Fan

Air Heater

Dust Collectorand Fan

Raymond® Roller Mills

Standard SizesRaymond® roller mills are availablewith grinding ring diameters rangingfrom 30 inches to 86 inches (760 to2180mm). Typical production rates areshown in the table above. These avail-able sizes are capable of producing awide range of product finenesses froma wide variety of materials.

Raymond® Roller Mill System withFlash DryingPractically all naturally occurring non-metallic minerals and many manufac-tured products contain a certainamount of free moisture. At one timeit was necessary to dry these prod-ucts in an independent system. Thetechnique used by Raymond com-bines drying and pulverizing in theroller mill. This may make it possibleto eliminate independent drying equip-ment reducing capital investmet, pro-cessing time and handling.

Flash Drying Principles of OperationHeated air or waste gas is deliveredto the mill return air housing and in-troduced through air ports to the grind-ing zone in the mill. The air turbulenceand particle size produced during thegrinding process are ideal for almostinstantaneous evaporation of moisture.

Feed moisture is normally limited towhat can be reliably fed into the mill.Typical product moistures are 0.1 to0.5% by weight.

03 05 45 06 66 37 68

007 008,1 003,2 008,2 000,4 006,5 004,8

Raymond offers the following to com-pliment the roller mill system:

• pilot plant material testing• premium wear parts• PLC-based control systems• field service support

Contact us to learn more aboutRaymond® Roller Mills - The IndustryStandard for Over a Century.

Typical Roller Mill System with Flash Drying

Maximum Water Evaporation* - lb/hr

* at nominal airflow and typical temperatures

Sizes and Systems

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ALSTOM Power, Inc.Raymond Operations4525 Weaver Parkway, Suite 250Warrenville, Illinois 60555 USAToll Free: 877.661.5509Tel: 630.393.1000Fax: 630.393.1001E-mail: info-raymond@power.alstom.comWebsite: www.raymondpulverizers.com

Raymond Laboratory Facility

2151 Fisher DriveNaperville, Illinois 60563Tel: 630.369.3700Fax: 630.983.6750

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