Impellers or Rotors

The impeller or agitator, also referred to as the rotor, is considered to be the heart of a mechanical flotation cell as it provides the energy to perform the following functions necessary for the flotation process:

1. Suspension of solids in the cell tank.

2. Dispersion of air into bubbles.

3. Creation of microturbulence for effective bubble-particle collision.

4. Suction of air into the cell in self-induced type cells.

The design of an impeller varies with cell type. Most impeller designs have a flat circular disc with different shapes of blades or fingers fitted to the disc concentrically to the lower section of the disc. The shape of the blades or fingers varies from cylindrical to tapered (half-spherical). The half-spherical impeller design is more popular in the new design of cells and details of this design will be discussed later in this article. The top section of the disc connects to a drive shaft which in turn connects to the pulley/gear-motor drive assembly. The impeller is located in the centre of the cell cross-section with its

Feed box

Figure 6 Schematic of a mechanical cell showing feed box and discharge box and concentrate launders.

Feed box

Figure 6 Schematic of a mechanical cell showing feed box and discharge box and concentrate launders.

Figure 7 Shapes of different impellers and stators. (A) Bate-man; (B) Dorr-Oliver; (C) Outokumpu; (D) Wemco (courtesy of Bateman Process Equipment, Dorr-Oliver, Outokumpu Mintec Oy and Baker Process, respectively).

submergence varying with cell type and mode of air entry. Figure 7 shows the shapes of different commercially available impellers.

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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