Granulators tumbling

Alumina Granulation (tumble/ pressure), calcining Build-up, caking, flow problems... 

Typically, dry potassium nitrate is pulverized in a ball mill. Sulfur is milled into cellular charcoal to form a uniform mix in a separate ball mill. The nitrate and the sulfur—charcoal mix are screened and then loosely mixed by hand or in a tumbling machine. Magnetic separators may be used to ensure the absence of ferrous metals. The preliminary mix is transferred to an edge-mimer wheel mill with large, heavy cast iron wheels. A clearance between the pan and the wheels is required for safety purposes. The size of this gap also contributes to the density of the black powder granules obtained. Water is added to minimize dusting and improve incorporation of the nitrate into the charcoal. The milling operation requires ca 3 to 6 h. 

Tumbling granulators Drums Discs 0.5 to 20 Moderate 0.5-800 ton/hr Very spherical granules Fertilizers, iron ore, non-ferrous ore, agricultural chemicals... 

They are less sensitive to operating conditions than tumbling granulators. 

Particle Motion and Scale-Up Veiy little fundamental information is published on centrifugal granulators. Qualitatively, good operation rehes on maintaining a smoothly rotating stable rope of tumbling... 

Potato meat or Potatopulp Explosives. Expls made by drying raw potato pulp, mixing it with about 80% of its wt of K chlorate, granulating and drying the mixt, and tumbling with graphite to coat the granules... 

Rotating cone, double cone, drum Tumbling action Blending dry, free-flowing powders, granules, crystals Pharmaceuticals, food, chemicals... 

Tsujimoto, H., Yokoyama, T. and Sekiguchi, I., The characterization of microgranules produced by a tumbling fluidized bed granulator with an opposed pulsed jet assembly, ]. Soc. Powder Tech. Japan, 35 (1998) 256-264. 

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