Selection of the Best Control Valve for Flotation Column and Flotation Cell Control, and Choosing the Best Method of Controlling Thickener Underflow

摘要

In this paper, various types of valves which can be utilized in flotation and thickening control are evaluated. For example, dart valves have been traditionally utilized on flotation cells; however, in certain designs, the dart valve may require an external box built onto the exterior of the flotation cell. There are alternate types of valves that do not require the containment box and thereby allow for a less expensive total assembly and still provide accurate and reliable control of the flotation cell. Furthermore, the low driving head in flotation cells may create challenges in selection of the control valve size. On the other hand, the best method of controlling thickener underflow is also evaluated. Depending on the installation, elevation of the thickener and outlet piping the thickener may be controlled with either a valve or may need to be controlled by a pump. The purpose of this portion of the paper is to offer ideas on the best technologies to increase the efficiency of the thickening process.