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Other Primary, Secondary, and Tertiary Compression Crushers

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Other Primary, Secondary, and Tertiary Compression Crushers

May 2, 2023 nflg 0 Comments

There are other compression crushers that should be considered for particular applications.

Mineral Sizers, manufactured by the MMD Group of Companies, Derbys, UK, can handle material up to 1.0 m3 (35 ft3) with a maximum throughput of up to 3180 t/h (3500 tph). The crusher has twin shafts which can be fitted with a range of teeth or picks. It is suitable for use on materials with compressive strengths in excess of 276,000 kPa (40,000 psi). The crusher is not suitable for low-abrasion ores.

The Stamler feeder /breaker, manufactured by the W.R. Stamler Corp., Millersburg, KY, is also a rotary pick breaker. The unit consists of a dump hopper, feeder, and single rotary pick breaker illustrated in Fig. It can handle material up to a compressive strength of 207,000 kPa (30,000 psi) on a continuous basis. Maximum feed size is 1.2 by 1.8 by 1.8 m (4 by 6 by 6 ft) to produce a 203-mm (8-in.) product at up to hard abrasive material only previously crushed by compressive crushers.

The basic principle of impact breaking is the total use of rotor energy in the reduction of the material. Kinetic energy is imparted to a particle of the material, and this energy is used chiefly to break down the bonding of the particle structure. The particle breaks along its planes of weakness and, as a result, produces a natural grain-shaped product.

Product gradation is a function of rotor speed and friability of the material. An increase in rotor speed or friability of material leads to an increase in the proportion of fines produced.

Conversely, a decrease in rotor speed or friability of material will decrease the proportion of fines in the product. This is illustrated in Table The desired product gradation is an important factor in choosing between an impactor and a hammermill. This is illustrated by the size-distribution curve. Fig. indicates the differences in products obtained from crushing an average limestone in both an impactor and a hammermill operating with approximately the same hammer tip speed. The hammermill yields an overall finer product gradation.

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