ScaleUp

Scale-up of the Jameson cell is relatively simple, since the flotation capacity is proportional to the cross-sectional area of the cell, and the flow capabilities of the downcomer. Downcomers range in size from 0.2 to 0.36 m, and a large installation will have multiple downcomers. Large cells are typically 5 m in diameter, with 12-16 downcomers, and handle flow rates of 1200m3h_1. Extensive testing has shown that the results obtained in small test units, of diameter 0.3 m, give an accurate picture of the performance of a large cell on the same feed. In many cases, test work is not required, because of the availability of data from operational plants which will allow a design to be established for a new application with an ore of similar characteristics.

Because there is a limit on the amount of air which can be supplied to a given amount of feed slurry in the downcomer, the Jameson cell can become limited by carrying capacity. Thus, if there is an excess of particles in the feed above the mass which can be carried by the available surface area of bubbles, some of the hydrophobic material will not be transferred to the concentrate. In such cases, it may be necessary to install a second cell in series with the first, to ensure a high recovery of the values. An alternative which is increasingly being used is to recycle part of the tailings. The feed pump is then sized so as to be well above the normal operating capacity. The feed pump draws from a pump box in the circuit ahead of the Jameson cell, and receives flow from two sources: new feed and recycled tails. It has been found that the recovery with recycle in the range 30-50% of the feed flow rate is equivalent to the addition of a second cell in series.

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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