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

ABSTRACT

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.

Keywords:

• Froth phase
• intra-bubble impact distance
• recovery
• superficial gas velocity
• froth height
• froth bubble sizes
• froth stability

Acknowledgments

The authors would like to thank Dr Frank Kienhofer for providing the SCX1 1520 data acquisition device.

Disclosure statement

The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the article.

Additional information

Funding

The authors would like to thank UNISA for providing financial assistance.