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Froth Recovery Factor-What is it , and Why is it so Difficult to Measure ?
| Content Provider | Semantic Scholar |
|---|---|
| Author | Araya, R. Gomez, C. O. Finch, James A. Yáñez, A. Pedro, Maiza Coddou, F. Elgueta, Herman Ortiz, Juan Manuel Muñiz Pérez, C. Cortés, Griselda Morales, Puerto López-Saucedo, F. Uribe-Salas, A. Magallanes-Hernández, L. Pérez-Garibay, Roberto Lara, C. Valenzuela |
| Copyright Year | 2009 |
| Abstract | ID: 2078 (KEYNOTE) Froth Recovery Factor What is it, and Why is it so Difficult to Measure? J. Franzidis and M. Harris. University of Cape Town Presenting from 8:00:00 To 8:25:00 Wednesday The past twenty to thirty years have seen unprecedented research activity aimed at understanding the performance of flotation froths. In 1990, Finch and Dobby coined the term froth recovery factor, Rf, to represent the efficiency of the froth in delivering particles from the pulp-froth interface to the concentrate. Originally defined for flotation columns, Rf has also been found useful in modeling mechanical flotation cells, and a number of techniques, based on quite different approaches, have been developed for measuring the froth recovery in industrial flotation cells. None of these techniques is universally successful. This paper reviews the concept of the froth recovery factor, and the basis of each of the techniques that have been proposed to measure Rf, and examines the reasons for this parameter being so difficult to pin down. Abstract ID: 2076 On the Carrying Capacity Limitation in Large Flotation Cells J. Yianatos and F. Contreras. Universidad Tecnica Federico Santa Maria Presenting from 8:25:00 To 8:50:00 Wednesday Mineral carrying rates across the pulp-froth interface in the range of 1.4-3.2 tph/m and bubble surface coverages between 7 and 22 %, have been determined in large rougher flotation cells operated under normal conditions. To evaluate these variables, measurements of bubble size distribution, bubble load and size distribution of particles collected by true flotation, were performed at different concentrators. A model for estimating the bubble surface coverage at the pulp-froth interface level as a function of bubble load, Sauter mean bubble diameter and particle size distribution of the mineral collected by true flotation, was developed. Bubble loadings in the range 24-70 kg/m, bubble sizes between 1.5 and 3.2 mm and superficial gas rates between 1.2 and 2.0 cm/s, were measured in copper rougher flotation cells under normal operating conditions. Estimated bubble surface area fluxes were in the range 31 to 62 cm/s/cm. Results of carrying rates and bubble surface coverage, at the pulp-froth interface, were significantly lower than the maximum carrying rate for the collection zone, indicating that in this case is difficult to achieve maximum carrying rate at the pulp-froth interface level. The main constraints regarding carrying capacity limitations are then related to the froth transport characteristics (i.e. cell design, froth residence time, froth stability, froth recovery).ID: 2076 On the Carrying Capacity Limitation in Large Flotation Cells J. Yianatos and F. Contreras. Universidad Tecnica Federico Santa Maria Presenting from 8:25:00 To 8:50:00 Wednesday Mineral carrying rates across the pulp-froth interface in the range of 1.4-3.2 tph/m and bubble surface coverages between 7 and 22 %, have been determined in large rougher flotation cells operated under normal conditions. To evaluate these variables, measurements of bubble size distribution, bubble load and size distribution of particles collected by true flotation, were performed at different concentrators. A model for estimating the bubble surface coverage at the pulp-froth interface level as a function of bubble load, Sauter mean bubble diameter and particle size distribution of the mineral collected by true flotation, was developed. Bubble loadings in the range 24-70 kg/m, bubble sizes between 1.5 and 3.2 mm and superficial gas rates between 1.2 and 2.0 cm/s, were measured in copper rougher flotation cells under normal operating conditions. Estimated bubble surface area fluxes were in the range 31 to 62 cm/s/cm. Results of carrying rates and bubble surface coverage, at the pulp-froth interface, were significantly lower than the maximum carrying rate for the collection zone, indicating that in this case is difficult to achieve maximum carrying rate at the pulp-froth interface level. The main constraints regarding carrying capacity limitations are then related to the froth transport characteristics (i.e. cell design, froth residence time, froth stability, froth recovery). Abstract ID: 2030 COM 2009: Technical Program Wednesday, August 26, 2009ID: 2030 COM 2009: Technical Program Wednesday, August 26, 2009 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://legacy.metsoc.org/com2009/PDFs/Program-wednesday.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
