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Grinding & Dispersing

CONDUX Fluidized Bed Jet Mill CGS
Ultra Fine Dry Grinding

our technology YOUR SUCCESS

CONDUX Fluidized Bed Jet Mill CGS

CONDUX Fluidized Bed Jet Mills set future trends for the fine grinding of dry materials within the range of d97 = 2 ?m to d97 = 70 ?m and are suitable for

 a large range of materials of any hardness  low contamination milling  grinding with - cold gas (0 - 20 °C) - hot gas up to 250 °C - inert gas

A wide range of machine sizes including lab-scale machines for research or small production amounts as well as larger production scale machines allow the milling of product quantities from a few kg/h to several t/h.

Fluidized Bed Jet Mill Type CGS 71 with oil circulating lubrification for hot gas operation

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Operating Principle
The product to be milled is fed through a double flap valve, into the flanged inlet (1) above the milling nozzles. A bed of material with increasing velocity is formed in the base of the milling chamber (2) which is fluidized by the gas stream from the milling nozzles (3). Particles from the fluid bed are drawn into the gas stream and accelerated with increasing velocity towards the centre of the chamber. Milling occurs by particle to particle impact along the gas stream and at the centre of the chamber. The milling gas, laden with particles, rises centrally to the classifier wheel (4), which is driven by a controlled variable speed motor (5) with belt drive. Coarse particles are rejected by the classifier wheel and return directly to the fluidized bed. Fine particles together with the milling gas exit at the fines outlet (6) and are separated in a cyclone or filter system.

4

5

6

1

2

3

3

Characteristics

Patented classifier design
Production of even finer materials than in the past is now possible with the new ConVor? classifier design. Constant radial velocity inside the classifier wheel, a co-rotating (exchangeable) immersion tube as well as a sturdy mechanical assembly make it possible to achieve the highest degree of fineness with maximum throughputs and this with only one classifier wheel. The classifier wheel is fitted with a vertical shaft. The resulting symmetrical assembly of the classifier wheel and the mill housing guarantees optimum flow. Coarse particles are directed back to the fluidized bed, without overloading the classifier wheel. This ensures considerably reduced load on the classifier motor and minimal wear.

Classifier wheel ConVorTM

Gas purged classifier gap
In the fines outlet housing, through which the milling air, classifier air and the fines leave the mill, the impact velocity has been reduced, so that wear and the formation of build-up have been largely eliminated. The gap between classifier wheel and the fines outlet is purged with gas. To a large extent, this prevents coarse particle migration into the fine product. The hinged classifier head simplifies cleaning and maintenance. Therefore, the classifier wheel and fines outlet are easily accessible. Low bed residue simplifies product change process and reduces the dwell time of the product in the milling chamber.

4

Weighing System
The fluidized bed level in the milling chamber controls the product feed. The weight of the bed is constantly monitored by the weighing system, which comprises one load cell and two fixed bearings. The data is analyzed and transmitted to the feeding system to ensure that the fluidized bed depth is maintained at its optimum level.

grinding air

fixed bearing

load cell

Load cell, mounted on CGS fixed bearing

No contamination of the material
The nozzles only supply the milling gas. The product is accelerated in a free gas jet. Size reduction is carried out through the impact of particle against particle.

Highly efficient milling procedure
The principle of milling in a fluidized bed guarantees the best use of energy. By using only a few, large, precisely positioned nozzles, this advantage is increased. Losses in the grinding gas supply are avoided by an optimum geometry of all pressure gas supply parts.
Nozzle arrangement

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Efficient and flexible

Alternatives
The design and machine size depends on the nature of the product and its particle size requirements. The mill is available in seven production sizes plus two for laboratory use, in addition special designs for machines can be chosen for a wide range of applications.

Bearings
The solid construction of the bearing housing and the optimized geometry of the locking gas sealing on the side of the classifying chamber guarantee a long life and excellent, quiet mechanical running. Two types of bearings are available:  grease lubricated  oil circulating lubrification for hot gas operation.

Nozzles The grinding gas nozzles can be delivered in various executions and are selected to suit the desired fineness and throughput. The execution, diameter and the (patented) distance between nozzles are selected to suit the grinding gas pressure for the particular application, which is determined via a process, for which a patent has also been applied.

LavalNozzle

Cylindrical Nozzle

H-Type Nozzle

Fluidized Bed Jet Mill Type CGS 180 for milling air consumption of 11 660 m3/h.

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Materials of construction
The choice of material depends on the product to be milled. Carbon steel as well as acid- and corrosion resistant stainless steels are standard. In addition, wear protection designs are available for milling of very hard abrasive material, which guarantee a contamination-free product. For example, grinding chamber and fines outlet are lined with ceramic or Vulcollan. The classifier wheel is available in ceramic or hard metal design for the highest operational demands. The advantages of the hard metal classifier wheel, compared to other wear protected classifier wheels, is its higher mechanical resistance, which means it can be operated at maximum classifier wheel speeds. Therefore, extremely high finenesses can also be obtained using just one classifier wheel.

Grinding chamber with ceramic lining

Saving energy with the
The unique grinding process e-Jet?, for which a patent has been applied, makes the use of air jet mills significantly more efficient through adapted grinding conditions and an optimized process. Energy savings of up to 30 % for e.g. minerals or amorphous chemical products, are convincing arguments! Up to now, air jet mills were mainly used for higher value-added products, but the new ?e-Jet? System“ can now be used for jet-milling in completely new fields of application. Even products which could previously only be produced economically on mechanical mills, can now be produced cheaply and with negligible wear costs on the Fluidized Bed Jet Mill of type CGS. There is also a considerable potential for improving the cost effectiveness of already existing applications through energy savings. The overall lower investment costs for a grinding plant make the new ?e-Jet? system“ an extremely interesting alternative.

e-JET

System
The newest innovation Jet grinding with superheated steam – the new s-Jet? system. This process, for which a patent has been applied and which renowned experts in the field of mechanical process engineering describe as a quantum leap for dry grinding, represents the latest further development of jet-milling. Now final finenesses in submicron ranges (e.g. d50 0.2 ?m) can also be achieved. Ask us for further details!

?

 Lower investment costs  Lower production costs  For all machine sizes  Many different products  Highest grinding fineness  Final product free of oversized particles  Steep particle size distribution  Grinding with minimum contamination  Can be retrofitted on many already existing plants

s-JET

System
7

?

Machines and plant design

The Fluidized Bed Jet Mill can be designed in various executions depending on product and requirements. The CONDUX Fluidized Bed Jet Mill type CGS and its corresponding equipment can be manufactured in PSR 10 bar (g), suitable for products with dust explosion hazards and also gas tight, suitable for inert gas operation.

ATEX Conformity
EC-TYPE EXAMINATION CERTIFICATE under the directive 94/9/EG, Appendix III

II 1 (i) D / 2 (o) D c 100 °C IBExU07ATEX1137X

blower

Feeder

bag filter

Fluidized Bed Jet Mill

double flap valve

Grinding Plant with Fluidized Bed Jet Mill CGS 150

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Example: Pharmaceuticals
The pharmaceutical industry requires products such as active ingredients and excipients as well as finished active ingredient formulations to be of a precisely defined high fineness, justifying the use of a fluidized bed jet mill. The same applies partly to the food industry. In this industry, the extremely high quality required of the final product also applies to the machines and plants used in the production process which must in turn ensure the reproducibility and consistent high quality of final products. The CONDUX Fluidized Bed Jet Mill is optionally available in a Pharma design to meet the high demands of these industries. The types of stainless steel used, 1.4571, (316 Ti), 1.4435 and 1.4404 (316 L), are pretreated by grinding and finished with an electrolytic polishing to give the necessary surface finish with an average peakto-valley height of Ra < 0.8 ?m or even higher if required. Construction in accordance with GMP ensures rapid and thorough cleaning on completion of the batch to prevent contamination of the next batch, which would impair the required hygienic, technical and pharmacological parameters. Pipework connections and/or plant components using quick release clamps simplify the rapid dismantling of the plant for cleaning purposes. FDA approved materials are standard for e.g. sealings and lubricants. In order to keep abreast of this application area, special know-how is required. NETZSCH-CONDUX has a team for Pharma projects, which liaises with renowned scientific institutions in order to be able to offer our customers competent and professional consulting.

Installation with Fluidized Bed Jet Mill CGS 32 in ?Pharma design“

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Examples of Applications Technical Data

Examples of products Active coal Ceramic catalyser Ceramic pigments Ceramic pigments Cobalt metal Cobalt oxide Dental ceramics Glass flakes Glass frits Graphite (natural) Graphite (syn.) Hard materials Hard materials Hard materials Iron oxide Lithium cobalt oxide Manganese oxide, activated Mica Molybdenum Molybdenum disulphite Neodymium ferroboron Organic pigments Oxalates Pesticide Petrol coke, calcined Pharmaceutical products Powder coating Ruthenium Shell lime Silica gel Silica Silicates, inorganic Talc Tungsten carbide Toner (one comp.) Toner (two comp.) Toner (micro) Toner (colour) Wax

Fineness [?m] d99 16 d90 10 d99 9.1 d95 5.2 d97 10 d99 5.8 d50 2 - 35 d50 12.2 - 25 d50 2.5 - 7 d97 3.76 d97 2.94 d97 2.75 d50 0.8 d99 1.88 d97 2.7 d99 6 d50 1.8 d99 24.1 d99 34 d99 3.5 d97 4 - 40 d99 6.5 d97 5 - 10 d99,9 44 d70 5 d97 20 d97 8.9 d99 50 d99 6.3 d50 8 d90 9.8 d95 10 d99 10 - 20 d99 3 d95 13.5 d50 11 d50 6.2 d99 14.2 d97 11

Size CGS 180 CGS 32 CGS 50 CGS 71 CGS 50 CGS 71 CGS 32 CGS 50 CGS 71 CGS 50 CGS 50 CGS 50 CGS 16 CGS 50 CGS 100 CGS 50 CGS 32 CGS 71 CGS 16 CGS 50 CGS 10 CGS 50 CGS 32 CGS 71 CGS 10 CGS 32 CGS 50 CGS 16 CGS 50 CGS 50 CGS 71 CGS 50 CGS 120 CGS 50 CGS 50 CGS 71 CGS 180 CGS 71 CGS 71

Capacity [kg h-1] 4 800 30 900 200 700 150 13 - 75 36 13.5 19.7 137 4.5 2 1 000 700 193 32 45 5 79 15 - 45 1 000 1-5 100 55 40 39 290 100 830 - 2 200 66 56 86 375 200 330
Sum distribution Q3

particle size distribution for hard material on Fluidized Bed Jet Mill CGS 50

535

d99 = 1.88 ?m 2 kg/h grinding gas 23 °C

Particle size d [?m] particle size distribution for graphite powder on Fluidized Bed Jet Mill CGS 50

Sum distribution Q3

50

d97 = 3.76 ?m 13.5 kg/h grinding gas 152 °C

Particle size d [?m]

particle size distribution for pesticides on Fluidized Bed Jet Mill CGS 71

Sum distribution Q3

360

d99.9 = 44 ?m 1000 kg/h grinding gas 52 °C

Particle size d [?m]

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Technical data Capacity factor Air flow *) Number of milling nozzles Nozzle diameter Milling chamber **) Classifier wheel power max. Max. speed Fineness ***) Length (A) Depth (B) Height (C) Weight (approx.) m3 h-1 pcs. mm mm kW min-1 ?m mm mm mm kg

CGS 32 0.35 330 3 5.0 350 4 7 000 2.5 - 70 1 000 1 000 1 575 680

CGS 50 1 960 3 8.5 600 7.5 5 100 2.5 - 80 1 450 1 450 2 270 1 200

CGS 71 2 1 920 3 12.0 800 15 3 600 3 - 85 1 800 1 800 2 880 3 000

CGS 100 4 3 860 3 17.0 1 200 30 2 600 3.5 - 90 2 680 2 680 3 930 5 400

CGS 120 6 5 770 4 18.0 1 500 55 2 200 4 - 90 3 000 3 000 5 000 11 000

CGS 150 9 8 640 4 22.1 1 800 75 1 700 5 - 90 3 600 3 600 6 100 16 000

CGS 180 12 11 660 4 25.6 2 100 90 1 550 5 - 90 4 200 4 200 7 300 20 000

*) Air flow based on pressure of 8 bar (abs.) and 20 °C **) outer ? ***) based on limestone (density 2.7 kg/l)

Test our Fluidized Bed Jet Mill CGS! We can run trials in our laboratory on different machine sizes with your material!

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The World’s Leading Grinding Technology

The Companies of the Business Unit Grinding & Dispersing NETZSCH-Feinmahltechnik GmbH, Selb, Germany NETZSCH-CONDUX Mahltechnik GmbH, Hanau, Germany NETZSCH Premier Technologies, LLC., Exton PA, USA NETZSCH Indústria e Comércio de Equipamentos de Moagem Ltda., Pomerode, Brazil NETZSCH (Shanghai) Machinery and Instruments Co., Ltd., Shanghai, China NETZSCH Mastermix Ltd., Lichfield, Great Britain NETZSCH-Espa?a, S.A., Terrassa/Barcelona, Spain ZAO NETZSCH Tula, Tula, Russia

The Business Unit Grinding & Dispersing is part of the NETZSCH Group.

NETZSCH-CONDUX Mahltechnik GmbH Rodenbacher Chaussee 1 63457 Hanau Germany Tel: +49 6181 506-01 Fax: +49 6181 571 270 info.ncx@netzsch.com

www.netzsch.com

G&D · CGS/12 · EN · 1000 · 0411 · LH · Technical specifications are subject to change

The NETZSCH Group is an owner-managed, internationally operating technology company headquartered in Germany. Three Business Units – Analyzing & Testing, Grinding & Dispersing, and Pumps & Systems – provide tailored solutions for highestlevel needs. Over 2300 employees at 130 sales and production centers in 23 countries across the globe guarantee that expert service is never far from our customers.


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