Quantifying contributions to froth stability in porphyry copper plants

A study of mechanisms affecting molybdenite recovery in a bulk copper/molybdenum flotation circuit

“…This implies that intermediate to coarse particles having contact angle greater than 90°are effective film breakers in froth flotation (Dippenaar, 1982). Flat and elongated molybdenite particles may fall into this category, and have, for this reason, lower recovery across the froth phase (Zanin et al, 2009), also called froth recovery (Savassi et al, 1997). In a separate investigation , it was shown that froth recovery in the roughers of a porphyry copper flotation plant decreases significantly down the bank (from 60% in the first cells to 20% in the last cells), and that froth recovery of molybdenite is generally lower than froth recovery of the copper sulphide.…”

Flotation Bubble Delineation Based on Harris Corner Detection and Local Gray Value Minima

“…And the surface bubble size can also be used as an effective measurement of bubble stability for the reason that it reflects the extent of bubble coalescence [12]. Zanin et al used the bubble size on the froth top as one of indicators for froth stability [13]. Furthermore, many researchers have reported the relationship between the bubble size, water recovery, and froth recovery, etc.…”

The use of the froth surface lamellae burst rate as a flotation froth stability measurement

“…Many of these measurement devices are intrusive, such as the column or electrical impedance measurements and the only non-intrusive stability measurements developed to date are based upon machine vision. Barbian et al (2005b) and Zanin et al (2009) developed froth stability measurement devices using a column inserted into a flotation cell. Their devices measure the rise rate of the froth surface, with the device developed by Zanin et al (2009) also measuring the froth half-life.…”

“…Barbian et al (2005b) and Zanin et al (2009) developed froth stability measurement devices using a column inserted into a flotation cell. Their devices measure the rise rate of the froth surface, with the device developed by Zanin et al (2009) also measuring the froth half-life. Hadler and Cilliers (2009) subsequently developed a device that can be permanently installed for on-line measurement.…”