0010

*These sieves correspond to those proposed as an international (I.S.O.) standard. It is recommended that wherever possible these sieves be included in all sieve analysis data or reports intended for international publication. fThese sieves are not in the fourth-root-of-2 series, but they have been included because they are in common usage. ited to the scalping or rough screening of dry material at 0.05 m (2 in) and coarser and are not satisfactory for moist and sticky material. The slope, or...

Wet Classification

General References Dyakowski, T., and Williams, R. A., Modelling Turbulent Flow within a Small Diameter Hydrocyclone, Chemical Engineering Science, vol. 48, p. 1143, 1993. Heiskanen, K., Particle Classification, Scarlett, B., (ed.), Powder Technology Series, Chapman & Hall, 1993. Fitch, B., Gravity Sedimentation Operations, McKetta J. J., (ed.), Unit Operations Handbook, vol. 2, Mechanical Separation and Material Handling, p. 51, Marcel Dekker, Inc., New York, 1993. Neal Abernathy, M. W.,...

24

NOTE Capacity information is based on the treatment of industrial minerals having a specific gravity of 2.6 to 4.0. NOTE Capacity information is based on the treatment of industrial minerals having a specific gravity of 2.6 to 4.0. FIG. 19-61 (a) Mineral separation high-capacity 4-roll (250 mm dia x 2000 mm long) separator featuring all-start x 2-pass separation. Siz-roll units also available. (b) Recycling separator for non-ferrous metals and plastics 4-roll (350 mm dia x 1500 mm long)...

D Baume Batac

FIG. 19-27 Schematic diagrams of the jigs. (a) Basic, (b) Denver Harz, (c) Remer, (d) Baum, and (e) Batac. Tables usually are surfaced either with heavy battleship linoleum or with rubber. The riffles may be a clear grade of sugar pine or may be rubber strips. Such riffles usually taper from the feed end of the table to the discharge end. Almost all mill operators employ different styles of riffling table, which they believe best for their particular separations. The usual method of riffling is...

Mixing

AIChE Standard Testing Procedure for Solids Mixing Equipment, American Institute of Chemical Engineers, New York. 2. Bullock, Chem. Eng., 66,177 (Apr. 20, 1959). 3. Danckwerts, Research, 6, 355-361 (1953). 4. Fischer, Chem. Eng., 67, 107 (Aug. 8, 1960). 5. Kirk and Othmer (eds), Encyclopedia of Chemical Technology, Wiley-Interscience, New York Rushton, Boutros, and Selheimer, Mixing and Agitating, vol. 9, 1st ed., pp. 133-166 Rushton and Boutros, Mixing and Blending, vol. 13, 2d ed., pp....

Waterlevelremoval belttrough

Electrolytic Flotation

FIG. 19-70 Schematic diagram of an electrolytic flotation plant. vacuum is applied, giving rise to the generation of the air bubbles. The process can be run only as a batch process and requires sophisticated equipment to produce and maintain the vacuum. By and large, the amount of air released during flotation is limited by the vacuum achievable. In contrast to vacuum flotation, dissolved-air flotation units can be operated on a continuous basis by the application of pressure. This consists of...

Magnetic Separation

General References Kolm, Oberteuffer, and Kelland, High-Gradient Magnetic Separation, Sci. Am., 233 5 , 46-54 November 1975 . Lawyer and Hopstock, Wet Magnetic Separation of Weakly Magnetic Materials, Min. Sci. Eng., 6 3 , 154-172 July 1974 . Marston, The Use of Electromagnetic Fields for the Separation of Minerals, World Electrical Congress, Moscow, 1977. Taggart, Handbook of Mineral Dressing, 2d ed., Wiley, New York, 1945. The principles of magnetic separation have been applied commercially...

Criteria For Sampler Design

Operation of a traversing sampler for gravity flow of material for through-stream sampling is required to meet the following design factors 1. The cutter moves at constant speed or constant rotation rate in the case of a rotary-motion sample cutter such that the entire flow of material is traversed by the cutter, with the further requirement that the stopped position of the cutter at either limit of traverse out of stream is at sufficient distance from the stream so that no material from the...

Screening

General References Beddow, Dry Separation Techniques, Chem. Eng., 88, 70 Aug. 10, 1981 . Colman, Selection Guidelines for Size and Type of Vibrating Screens in Ore Crushing Plants, in Mular and Bhappu eds. , Mineral Processing Plant Design, 2d ed., Society of Mining Engineers, AIME, New York, 1980. Kuenhold, Factors to Consider in Vibrating Screen Installations, Min. Eng., 650-653 June 1957 . Matthews, Chem. Eng., deskbook issue, 99 Feb. 15, 1971 . Matthews, Screening, Chem. Eng., 79, 76 July...

Underflow

Wemco Drum Separators

Courtesy Krebs Engineers. cyclones in a single case. Larger sizes may be used singly or manifolded by outside piping. The hydrocyclone has mostly replaced other classifiers in closed-circuit grinding. Typical uses more in line with chemical applications are degritting milk of lime and of red mud in alumina production, removal of carbonaceous material in upgrading gypsum produced in making phosphoric acid, open-circuit washing of fine uranium pulps, classification of...

Selecting A Sampler

Mineral Processing Conveyor

Mechanical samplers meeting delimitation criteria are available in two basic designs for sampling material in gravity free fall. The basic designs are sampling with linear cutter motion and sampling with radial cutter motion see Fig. 19-3 and Fig. 19-4 respectively . The net result is the same with either when equipment is properly designed and operated. Selection of linear or radial rotary cutter sampling is made according to mechanical installation factors often on a basis of flow quantity....