Relationship between froth bubble size estimates and flotation performance in a semi-batch lab cell

The relationship between froth bubble size estimates represented by intra-bubble impact distances (IIDs)) and flotation performance is investigated. Flotation tests were carried out in a pseudo-steady-state circuit using an artificial ore made up of limestone and silica. Froth bubble sizes were estimated using an electro-resistive method while varying superficial gas velocity and froth depth. Results indicate that as froth height was increased, the average IID values also increased. This resulted in a decrease in limestone recovery while grade increased and vice versa. Increasing gas rate resulted in lower IID values that were accompanied by high limestone recovery at lower grades.