Froth images and froth stability was obtained by using VisioFroth software developed by Metso Minerals Cisa. The camera
was set up above the flotation cell and connected with a computer.
The measurement area was 15.9 cm 15.9 cm. The camera signals
were relayed back via an ethernet cable and an optical fibre to the
central processing computer. When flotation commenced, the camera recorded the froth every second automatically. The recorded
images were then processed manually for calculating the froth stability. Froth stability calculated by VisoFroth is the % similarity
between successive frames indicated by correlation peaks which
are affected by bubble coalescence. High froth stability is indicated
by high % similarity of successive frames. The detailed procedure
has been described elsewhere