Jet pulverizer

The jet pulverizer (jet Pulverizer Co.) is another mill of the shallow-pan, angle-jet, and radial-inward-classification type, hke the Micronizer. 

The Majac jet pulverizer (Ho.sokawa Micron Powder Sy.stems Div.) is an opposed-jet type with a mechanical classifier (Fig. 20-55). Fineness is controlled primarily by the classifier speed and the amount of fan air dehvered to the classifier, but other effects can be achieved by variation of nozzle pressure, distance between the muzzles of the gun barrels, and position of the classifier disk. These pulverizers are available in 30 sizes, operated on quantities of compressed air ranging from approximately 0.6 to 13.0 mVmin (20 to 4500 ftV min). In most apphcations, the economics of the use of this type of jet pulverizer becomes attractive in the range of 98 percent through 200 mesh or finer. 

FIG. 20-55 Majac jet pulverizer. (Hosokawa Micron Powder Systems Div. )... 

In most applications, the economics of the use of this type of jet pulverizer becomes attractive in the range of product fineness of 98% through 200 mesh or finer as finer products are required, this equipment becomes increasingly attractive. 

A machine for the comminution, or size reduction, of mineral or other particles. Such machines accelerate feed particles in a jet and cause size reduction by promoting interparticle and particle-wall collisions at high speed. Very small-sized particles can be produced with these mills. Also termed jet pulverizers. 

Micronization of our antifungal using the favored Jet pulverizer micronizer (Figure 17) led to the desired particle size product however, the micronizer Venturi feed mechanism rapidly (1-3 min) became clogged by a ceramic-like coating on the... 

TABLE 2. Micronization Studies3 with Wet API Using a Four-Inch Jet Pulverizer Particle Size Distribution... 

Majac jet-pulverizer performance on natural graphite is given in Table 20-27. Graphite for pencils has 47, 83, 91, and 94 percent by weight smaller than 4, 9, 18, and 31 jxm respectively. 

Mechanical impact mills cause size reduction by causing particles to strike a surface at high speed (also termed jet mills, jet pulverizers). 

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