The Hosokawa Mikro Pulverizer® Hammer and Screen Mill is one of the most versatile and durable systems for fine size reduction down to D 97 < 45 µm. This brief video demonstration will highlight the features and operation of the Hosokawa 100 HP hammer mill (MP #4) which is used for specialty chemical applications. The Mikro Pulverizer Hammer and Screen Mills range from 1 HP up to 350 HP.
The Hammer and Screen Mill is a high-speed mechanical impact mill designed for continuous size reduction of a wide range of materials for chemical, pharmaceutical, food, mineral, and cosmetic applications. This device has evolved into the preeminent industrial mill with thousands of worldwide installations.
Design and Options:
The Mikro Pulverizer consists of a high-speed rotor assembly fitted with hammers. The grinding chamber is fitted with a cover containing a multiple deflector liner and a retaining screen at the point of mill discharge.
A screw mechanism is often used to introduce feed material into the grinding chamber. The grinding process is affected by three basic variables: the type of hammers, the rotor speed, and the size and shape of the screen opening.
There are two types of hammers: the “stirrup,” recommended where a fine particle size is desired; and the “bar,” which generates a coarser grind with a minimum of fines. Both types are tipped at the wearing edge with various abrasion-resistant alloys. Rotor speed affects the fineness of the grind as follows: low speeds result in a coarse grind and high speeds produce a fine grind. Size and shape of the retaining screen openings also affect the product. In general, a finer screen opening will result in a finer grind. The retaining screen does not function as a sifting screen, except in coarse granulations.
Controlled Particle Size
Optimum particle size reduction can greatly affect chemical reaction speeds, solubility, weight, color, volume, appearance, and strength of ground products. Mikro-Pulverizers® provide accuracy in particle size control because the grinding action is entirely mechanical. Once a mill is set to deliver a certain product, it will continue to produce exactly the same result without adjustment.