What is flotation in biology?
The attachment of bubbles to particles transfers the solids from the body of water to the surface. As opposed to settling, flotation is a solid-liquid separation technique that is applied to particles whose density is lower or has been made lower than the liquid they are in.
What is flotation and how does it work?
flotation, in mineral processing, method used to separate and concentrate ores by altering their surfaces to a hydrophobic or hydrophilic condition—that is, the surfaces are either repelled or attracted by water. Most kinds of minerals require coating with a water repellent to make them float.
What is mechanical flotation cell?
A cell in which the solids-water pulp feed is kept agitated, and is circulated by means of an impeller mounted at the bottom of a vertical shaft.
What is flotation column?
Flotation columns comprise a tall tank, in which the separation between froth and pulp occurs, an aeration system, a pulp level control system, a wash water system, a discharge barometric leg and a set of control instruments, besides pipe connections for feed, concentrate and tailings.
What is meant by flotation in chemistry?
Flotation is a process in Liquid-Solid Separation technology whereby solids in suspension are recovered by their attachment to gas (usually air) bubbles, usually with objective of removing the solids from the liquid. The particles most effectively removed are in the size range from 10 to 200 μm.
What do you mean by flotation in physics?
The principle of floatation states that when an object floats on a liquid the buoyant force that acts on the object is equal to the weight of the object. Following are the pointers to remember in floatation: The displaced volume of fluid is equal to the volume of the object which is immersed in the fluid.
What are flotation reagents?
The process involves the aeration of minerals in water in the presence of flotation reagents which facilitate the attachment of air bubbles to and levitation of select minerals. Once at the surface, the select minerals are supported by a froth layer until they are removed.
How does flotation occur?
When an object is placed in water it causes the water to be displaced (move upwards). If the gravitational force on the water is greater than the force on the object, then the water will create a buoyant force that will push the object upwards against gravity.
What are the types of flotation?
There are three types of flotation: natural, aided and induced flotation. Valid if the difference in density is naturally sufficient for separation. Occurs when external means are used to promote the separation of particles that are naturally floatable.
What industries use flotation?
Froth flotation chemicals are largely used in the mining industry for recovering minerals from the slurry, separation of impurities, purification of certain minerals, and many other applications. The chemicals are employed in wastewater treatment, paper and pulp production, and other major uses.
How does a Jameson cell work?
A Jameson Cell consists of three main zones: the downcomer, the tank pulp zone, and the tank froth zone. The Downcomer is the heart of the Jameson Cell where intense contact between air bubbles and particles occurs. Feed is pumped into the downcomer through the slurry lens orifice creating a high-pressure jet.
What does flotation mean in chemistry?
What is cell-to-cell flotation machine?
The cell-to-cell flotation machine is typified by a flotation mechanism suspended in an individual cell separated from the adjoining cells by an adjustable weir. A feed pipe conducts the flow of pulp from the weir of the preceding cell to the mechanism.
What is flotation flotation concentrate?
Flotation concentrates are combined from all cells and then further upgraded by cleaning in other Flotation Cells. A typical modern fluorspar mill where cell-to-cell Flotation Machines are used to clean and reclean fluorspar concentrates to meet market specifications for acid-grade fluorspar.
What are agagitated flotation cells?
Agitated flotation cells are widely used in the mineral processing industry for separating, recovering, and concentrating valuable particulate material from undesired gangue. Their performance is lowered, however, when part of the particulate system consists of fines, with particle diameters typically in the range from 30 to 100 μm.
How does the GECO new-cell flotation cell work?
In the Geco New-Cell Flotation Cell the pneumatic principle is utilized in conjunction with an agitating device. The machine, which is illustrated in Fig. 44, consists of a trough or cell made of steel or wood, whichever is more convenient, through the bottom of which projects a series of air pipes fitted with circular mats of perforated rubber.