APSC 150 Lectures-Part I

APSC 150 Lectures-Part I - Separation of Minerals by Froth...

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Separation of Minerals by Froth Flotation Marek Pawlik Associate Professor Norman B. Keevil Institute of Mining Engineering Room 508A, Frank Forward Bldg. Phone: (604) 827-5034 Fax: (604) 822-5599 E-mail: mpp@mining.ubc.ca
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General Introduction to Mineral Processing - What is it ? Why do we need it ? How do we do it ? - Properties of minerals (physical and chemical) relevant to mineral processing. Bulk properties versus surface properties. -Minerals as sources of metals and chemical compounds. Chemical composition of minerals. -What are ores ? Methods of characterization of ores. Ores as mixtures of various minerals.
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Mineral Processing Technologies - Role of grain/particle size of minerals in process selection. The concept of particle size distribution and mineral liberation. - Wet and dry methods – water as a process medium. - Froth flotation as a wet method for separating very fine particles. - Behavior of solid (mineral) particles in water. What happens when a mineral particle is placed in water ? - Fundamental concepts relevant to froth flotation: surface charge of solids, surface wettability by water, surface potential, zeta potential. Air as a critical component of all froth flotation systems.
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- Chemicals used in froth flotation. - Kinetics of froth flotation. - Froth flotation as a continuous process. Flotation cells and banks. - Basic concepts of grade, yield, and recovery. Mass balance calculations. - Examples of froth flotation plants - Environmental considerations
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Mineral Processing – a sequence of unit operations necessary to: 1)prepare an ore (feed) for a given separation process, 2)separate the ore into valuable components (concentrates) and unwanted waste (tailings). Ad 1) Ore preparation typically involves: breaking, crushing, grinding (size reduction operations), and classification by particle size into coarse and fine size fractions. Ad 2) Separation of minerals can be achieved using several different techniques which rely either on bulk or surface properties of minerals, or a combination of both. ...
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Underground mines Open-pit mines Size reduction by crushing, breaking and grinding, followed by classification by size Methods based on bulk properties and/or surface properties Concentrate Tailings Mining Ore Preparation Mineral Separation Any separation process will be successful only if the minerals to be separated are sufficiently liberated from one another. In the case of large rocks coming from a mine, high degrees of mineral liberation can only be achieved by crushing and grinding the rocks to very small particles sizes.
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valuable minerals within host rock Micro-veins and other inclusions 1) How fine do we need to grind this piece in order to release (or to liberate) the valuable micro-crystals and inclusions ? 2) How do we know at the end that the valuable mineral was indeed
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APSC 150 Lectures-Part I - Separation of Minerals by Froth...

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