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Mechanical screening, often just called screening, is the practice of taking granulated ore material and separating it into multiple grades by particle size. This practice occurs in a variety of industries such as mining and mineral processing, agriculture .
Tuffman Model 722-P Portable Trommel Screen - Rock/Sand Sifting Demo - Duration: 3:05. Worldwide Recycling Equipment Sales, LLC 33,277 views
The metal smelting and refining industry processes metal ores and scrap metal to obtain pure metals. The metal working industries process metals in order to manufacture machine components, machinery, instruments and tools which are needed by other industries .