The first pneumatic flotation cell, which used air sparging through a porous bottom and horizontal slurry flow, was patented in 1914 by Callow. The first countercurrent column flotation device was designed and tested by Town and Flynn in 1919. Cross-current

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pneumatic flotation machines were widely used in industry in the 1920s and 1930s, but were later replaced by the impeller-type Sotation devices in mineral-processing plants. Dissolved-air Sotation became the main type of Sotation for water treatment applications. These substitutions were the result of the absence of effective and reliable air spargers for Rne bubble generation and the lack of automatic control systems on the early columns. During this period, both the poor Sotation selectivity and entrain-ment of slimes characteristic of impeller-type cells were offset by the use of complex Sow sheets using large numbers of cleaner stages and recycle lines. Column Sotation devices were reintroduced

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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