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Flotation process

    The '''Flotation process''' is a method for the separation of mixtures Flotation is a separation technique used widely in the minerals industry for paper de-inking and water treatment amongst others It can also be used in the food and coal industries The technique relies upon differences in the surface properties of different particles to separate them The particles that are to be floated are rendered hydrophobic by the addition of the appropriate chemicals Air is then bubbled through the mixture and the desired particles become attached to the small air bubbles and move to the surface where they accumulate as a froth and are collected or if the non-desired particles float to the surface they are collected and discarded The flotation process was developed on a commercial scale early in the 20th century at Broken Hill in Australia and is widely used for processing of sulphide minerals (copper lead zinc nickel cobalt etc) When used in this connection it is termed Froth flotation
    The flotation process is also widely used in industrial waste water treatment plants where it is applied to remove fats oil grease and suspended solids from waste water These units are called Dissolved Air Flotation (DAF) units Some important suppliers and innovators of DAF technology are REDOX Water Technology Krofta and US Filter