Process And Flow Analysis during mining technological process

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(Free-Press-Release.com) January 12, 2012 -- Mineral processing can involve four general types of unit operation: comminution – particle size reduction; sizing – separation of particle sizes by screening or classification; concentration by taking advantage of physical and surface chemical properties; and dewatering – solid/liquid separation. In all of these processes, the most important considerations are the economics of the processes and this is dictated by the grade and recovery of the final product.

Comminution:

Comminution is particle size reduction of materials. Comminution may be carried out on either dry materials or slurries. Crushing and grinding are the two primary comminution processes. Crushing is normally carried out on 'run-of-mine' ore, while grinding (normally carried out after crushing) may be conducted on dry or slurried material.

Sizing：Sizing is the general term for separation of particles according to their size.

The simplest sizing process is screening, or passing the particles to be sized through a screen or number of screens. Screening equipment can include grizzlies, bar screens,wedge wire screens,banna screens, multi deck screens, vibratory screed, fine screens, flip flop screens and wire mesh screens. Screens can be static (typically the case for very coarse material), or they can incorporate mechanisms to shake or vibrate the screen. Some considerations in this process includes the screen material, the aperature size, shape and oreintation, the amount of near sized particles, the addition of water, the amplitude and frequency of the virbations, the angle of inclination, the presence of harmful materials, like steel and wood, and the size distribtuion of the particles.

Concentration:

There are a number of ways to increase the concentration of the wanted minerals: in any particular case the method chosen will depend on the relative physical and surface chemical properties of the mineral and the gangue.

Gravity concentrationHistorically the earliest method used, particles can be classified based on their specific gravity.Air is the main fluid medium used for the process. Gravity concentration processes include:

Heavy media or dense media separation (these include, baths, drums, larcodems, dyana whirlpool separators, and dense medium cyclones);Shaking tables, such as the Wilfley table; Spiral separators; Batac jigs; Centrifugal bowl concentrators; Jig concentrators are continuous processing gravity concentration devices using a pulsating fluidized bed; Multi gravity separators (Falcon, Knelson, Mozley and the Kelsey Jig); Inline pressure Jigs; Reichert Cones.

Magnetic Separating Process and Floatation Separating Process are two types of Ore Dressing Prosess.

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