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            [post_title] => Micron Xerbis Agitated Media Flash Dryer
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The Mikro® UMP Universal Milling System utilizes the same design and operating principles perfected in the original Mikro Pulverizer® Hammer & Screen Mill. The Mikro® UMP was developed to meet the increased market demand for high performance machines for multiple applications. An interchangeable grinding mechanism for flexible particle size distribution is a key feature to this machine’s design. Multiple feed and collection options further enhance the flexibility of the Mikro® UMP Universal Milling System across food, pharmaceutical and chemical applications.

The fabricated grinding chamber is constructed in 316 stainless steel with a high quality 0.6 micron Ra finish. Higher quality finishes are available for specialty applications. The access door is hinged to the grinding chamber and is secured with a tri-clamp connection for easy and quick inspection and cleaning. The bearing housing is a cantilevered design and includes maintenance free, sealed for life bearings. There are double lip seals and a gas purge between the drive and process areas to eliminate material contamination and premature wear to drive components.

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Bauxite

Bauxite is heterogeneous mineral containing aluminum hydroxide minerals such as gibbsite, boehmite and disapore.  It is a sedimentary rock mixed with kaolinite clay that might have some iron oxide minerals mixed in. 

Bauxite is used as a source of Aluminum Oxide (Al2O3) which is used in ceramics or as an abrasive (or for abrasion resistance).  Bauxite is also the main source for Aluminum Metal production. 

Aluminum Hydroxide minerals (gibbsite, boehmite and disapore)and Kaolinite Clay both have a relatively low Mohs hardness with Aluminum Hydroxide ranging from 2.5 – 3 and Kaolinite Clay ranging from 2 – 2.5 on the Mohs hardness scale. However, Bauxite has varying levels of abrasive materials such as haematite (iron oxide) or quartz / sand.   

One of the standard methods of milling Bauxite is with the Hosokawa Mikro® ACM Air Classifying Mill .   To verify that the Mikro ACM® is a good fit, the amount of abrasive impurities needs to be determined (should be 3% or less).  

The ACM has a rotating rotor disc with hammers which rotates with speeds up to 23,000 feet per minute.  The particle size is controlled by the internal air classifier, to provide sharp particle size distributions.  Various classifier designs are available, to produce from coarse (100 mesh) product down to a fineness of 400 mesh product or a D50 < 10 microns.  Abrasion Resistant options are available, including tungsten carbide tipping, Ni-Hard or Ceramic liners to assist with abrasive impurities and to assist with long life of mill components.  Warm air can also be used to dry the product while milling.

For highly abrasive applications (> 3% abrasive impurities), or for ultra-fine (D50 < 5 microns) milling, the Hosokawa Alpine Super Orion Ball Mill and Air Classifier  are the best option.  These units come in a variety of sizes to meet your application needs.

Contact Hosokawa’s mineral applications department to learn more about Bauxite Milling.