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cpp PROCESS ENGINEERING Extremely compact dimensions, simple operation, easy cleaning – from the outset, the Lab Compact Plus was designed for problem-free use in a laboratory setting Particle size distribution of Nd-Fe- B-powder after grinding on an M-Jet and classifying with M-Class (grey) compared to a conventionally processed product (red) ration limits are adjusted by steplessly varying the classifier speed. Easy access is guaranteed for cleaning purposes. The diversity of the potential applications demands ever higher degrees of separation and finer separation cuts. This has led to the development of even more efficient ultrafine classifiers enabling optimum pre-dispersion. The CFS 5 HD-S high-efficiency fine classifier significantly increases the possible fineness (d 97 = 2.5 to 100 μm), degree of separation and yield owing to the peripheral guide vane ring around the classifier wheel and the improved wheel geometry. Typical applications When manufacturing neodym-iron-boron magnets (Nd-Fe-B), a narrow particle size distribution and as few very fine (8 μm) particles as possible are decisive with regard to quality and properties. Sensitive Nd-Fe-B compounds or other rare earth alloys can be reduced reliably and reproducibly to fine powder with a narrow particle size distribution and a defined upper particle size limit with the help of an optimised version of the Lab Compact Plus. The compact, airtight skid is used for this purpose under inert conditions (N 2 or argon atmosphere) and the oxygen content monitored by a lambda sensor. PU-lined components prevent product build-up while special product feed and collection tanks with rinsing connections for argon and N 2 guarantee safe handling of pyrophoric compounds. The M-Jet (a more advanced version of the Conjet), a high-density bed jet mill for rare earth applications which allows difficult-togrind components to be automatically rejected without contaminating product-contacted sections of the piping, was developed by Netzsch to facilitate size reduction. The dynamic air classifier integrated in the M-Jet ensures a defined upper particle size limit of the ground product. Ultra-fine fractions can be separated as required in a downstream step by classifying the grinding product with a Netzsch high-efficiency fine classifier to give a powder with a defined, narrower particle size distribution. The M-Class, which has a special guide vane basket (similar to the CFS/HD-S) and is optimised specifically for rare earth alloys, is employed for this classifying step. www.cpp-net.com Online search: cpp0318netzsch AUTHOR: DR. STEFAN JUNG Marketing Manager, Netzsch Trockenmahltechnik AUTHOR: FRANK WINTER Head of Design and Development, Netzsch Trockenmahltechnik 36 cpp 03-2018
cpp TRADE FAIR REVIEW Two TOC analysers in a row Data acquisition, evaluation and storing Picture: LAR For the measurement of TOC LAR developed two devices. First, a TOC analyser for ultra pure water applications with TOC contents
