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Effects of air-to-pulp ratio and bias factor on flotation of complex cu-zn sulphide ore in the Jameson cell

Gursoy Y. H., Oteyaka B.

Physicochemical Problems of Mineral Processing

2015

Vol. 51, iss. 2

511--519

The air-to-pulp ratio and bias factor are important operating parameters in the Jameson flotation cell. These parameters have significant effect on micro-events taking place between particles and bubbles in flotation, and hence on flotation performance. In this study, the possibilities of obtaining a Cu-Zn rich bulk concentrate from complex sulphide ore from the Cayeli region (Turkey) were investigated using the lab-scale Jameson cell. The effect of air-to-pulp ratio and bias factor on flotation recovery were also studied. The ore has problematic flotation behaviour due to very fine liberation size and oxidation. The results showed that the Cu-Zn rich bulk concentrate can be obtained from the ore with satisfactory grade and recovery. It was determined that the air-to-pulp ratio and bias factor have significant effect on the flotation recovery. The optimum values of air-to-pulp ratio and bias factor in flotation of rather fine sized minerals were determined to be within the range of 1-1.5 and 0.70-0.95, respectively.

Uncertainties in the building process

Nowak A., Rakoczy A.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2013

Vol. 61, nr 1

129-135

Load and resistance have to be treated as random variables because of natural and man-made uncertainties. Statistical parameters, i.e. bias factors and coefficients of variation, are presented for natural effects of dead load, live load for buildings and bridges, and environmental loads. Man-made effects are more difficult to quantify as they include also human errors. For resistance, the uncertainties are considered as a combination of three factors: material, fabrication and professional. The statistical parameters are shown for structural steel, reinforced concrete, and prestressed concrete. These parameters allow for calculation of the reliability indices for structural components and assessment of the effect of uncertainties in load and resistance on the structural safety.