neTZsCH Fluidized Bed Jet Mill CGs
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Proven Excellence NETZSCH Fluidized Bed Jet Mill CGS Ultra Fine Dry Grinding Business Unit GRINDING & DiSPERSiNG

NETZSCH Fluidized Bed Jet Mill CGS Fluidized Bed Jet Mills set future trends for the fine grinding of dry materials within the range of d97 = 2 µm to d97 = 70 µm and are suitable for a large range of materials of any hardness low contamination milling grinding with cold gas (0°C- 20°C) hot gas up to 250°C inert gas Fluidized Bed Jet Mill Type CGS 71 with oil circulating lubrication for hot gas operation 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

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...

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...

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. Load cell, mounted on CGS grinding air fixed bearing load cell 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...

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. 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: The grinding gas nozzles can be delivered in various...

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 Vulkollan. 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...

Machines and plant design The Fluidized Bed Jet Mill can be designed in various executions depending on product and requirements. The 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 EU-TYPE EXAMINATION CERTIFICATE acc. to directive 2014/34/EU Grinding Plant with Fluidized Bed Jet Mill CGS 150 Double flap valve

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 Fluidized Bed Jet Mill is optionally available in a...

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...

Technical data Capacity factor - - Number of milling nozzles pcs. 3 3 Nozzle diameter Milling chamber ** Classifier wheel power max. Max. speed Fineness d97*** Length(A) Depth (B) Height (C) Weight (approx.) * Air flow based on pressure of 8 bar (abs.) and 20°C ** outer 0 *** 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!

The NETZSCH Group is an owner-managed, international technology company with headquarters in Germany. The Business Units Analyzing & Testing, Grinding & Dispersing and Pumps & Systems represent customized solutions at the highest level. More than 4,000 employees in 36 countries and a worldwide sales and service network ensure customer proximity and competent service. Our performance standards are high. We promise our customers Proven Excellence – exceptional performance in everything we do, proven time and again since 1873. NETZSCH-Feinmahltechnik – Germany NETZSCH Trockenmahltechnik –...