Other Devices and Processes Using Feed Slurry Aeration

Jameson cell The innovative design of the Jameson cell is based on the point of air addition and bubble generation. It utilized the concept of reactor and separator design. The downcomer into which air is aspirated and particle collection occurs is the reactor, while the cylindrical tank is the separator. The feed under high pressure is introduced at the top of the downcomer through a nozzle, producing a high speed slurry jet which entrains air into the downcomer. In

Figure 6 Fine silica recovery vs slurry velocity through the nozzle of a cavitation tube. Conditions: 1 wt.% silica ( - 5 |im); 10 p.p.m. Dowfroth 250; 1.25 x 10~4 mol L~1 DAH; pH = 7.5-7.8; air flow rate in the mechanical cell - 2 L min-1.

Figure 4 Comparison in nickel metallurgy between a plant rougher flotation circuit and two VAC cells in series. Squares, two VAC cells, circles, mill overall daily; triangles, mill roughers.

Figure 6 Fine silica recovery vs slurry velocity through the nozzle of a cavitation tube. Conditions: 1 wt.% silica ( - 5 |im); 10 p.p.m. Dowfroth 250; 1.25 x 10~4 mol L~1 DAH; pH = 7.5-7.8; air flow rate in the mechanical cell - 2 L min-1.

addition to its successful use in sulfide minerals and coal flotation, the Jameson cell has also been adopted in de-inking applications for the paper industry.

Davcra cell The Davcra cell is a type of pneumatic machine, employing feed slurry aeration. Air and feed slurry are injected into the separating tank through a cyclone-type dispersion nozzle. Air dispersion and particle collection take place in the nozzle and in the highly turbulent region in the separation tank, which is separated by the quiescent zone. A limited application has been reported.

Low energy extraction process for bitumen extraction from oil sands In bitumen extraction from Athabasca oil sands, Syncrude Canada recently adopted a low energy extraction process with hydrotransport of oil sand slurries. Oil sand slurry is transported from the mine site via pipelines (3-5 km) with a relatively high slurry velocity (4 m s-1). Air is injected into the pipelines. The aerated oil sand slurry is then introduced into primary separation vessels through a tangential entry feed well. Bitumen droplets attached to air bubbles float to the top of the remaining slurry to form a primary froth. Wash water is added under the froth to reduce the amount of solids reporting to the bitumen froth. Here, hydrotransport pipelines function as a reactor to increase the bubble-bitumen contact frequencies. This technique has been implemented in operation.

The Microcel, German Bahr's cell, rapid flotation cell, Contact cell, Centrifloat cell, and air-sparged hydrocyclone are other examples employing feed slurry aeration and the concept of reactor and separator design.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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