Sohds handling

Pusher centrifuges require high feed concentrations to enable the formation of a sufficiently rigid cake to transmit the thmst of the piston. The diameters vary from 150 to 1400 mm, the stroke frequency from 20 to 100 strokes per minute, and the soHds handling capacities up to 40 metric tons per hour or more. 

G. D. Dumbaugh, "A Comparative Review of Vibratory Drives for Bulk SoHds Handling Systems," Proceedings of the 10th Powder andBulk Solids Conference, Chicago, May 1985, pp. 425—470. 

For hquid and/or sohd handling, A. V. Bridgwater and F. D. G. Bossom (Proceedings of the 6th International Cost Engineenng Con-ferenee, Mexico, October, 1980) suggested the following equations ... 

The hquid-handling capacity of the tubular-bowl centrifuge varies with use. The low end shown in Table 18-11 corresponds to stripping small bac teria from a culture medium. The high end corresponds to puri ng transformer oil and restoring its dielectric value. The sohds-handling capacity of this centrifuge is limited to 4.5 kg (10 lb) or less. Typically, the feed stream solids should be less than 1 percent in practice. 

A slurry is a mixture of a liquid and solid particles. The term sludge typically refers to a highly concentrated slurry containing fine particulate material. Each year, vast tonnages of slurries are pumped. Slurries are often used to transport coal, phosphates and minerals. Dredging of sand and silt in the maintenance of waterways is another example of sohds handled in slurry form. In most slurries, the liquid phase is water. However, coal-oil and coal-methanol fuels are examples of slurries made up with liquids other than water. 

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