İbrahim Sönmez

Investigation of coal and ash recovery and entrainment in flotation

This paper discusses the effect of particle size, impeller speed and pulp density on flotation and entrainment of coal and associated gangue, consisting mostly of kaolinite and illite. Experimental work indicated that particle size was the most important parameter influencing the recovery and entrainment behavior of coal and ash. The effects of impeller speed and pulp density were found to be less on entrainment. Lower agitation or solid density with higher kerosene concentrations yielded more selective froth products at the same recovery level and lower entrainment.

Fundamental aspects of spherical oil agglomeration of calcite

Abstract In this study, concentration of calcite particles was investigated using oil agglomeration. For this purpose, effects of operating parameters were investigated and also zeta potential measurements and Fourier transform infrared spectrophotometer (FTIR) analyses have been carried out. In the experiments, effects of operating parameters such as pH, stirring speed, amount of Na–oleate as a collector and kerosene as a bridging liquid, solid ratio, suspension conditioning time, collector stirring time and agglomeration time were investigated to obtain optimum conditions. Zeta potential measurements were carried out depending on pH values and amount of Na–oleate. FTIR analyses were investigated to determine the adsorption type of Na–oleate on calcite surface. By the evaluation of the experimental results, optimum oil agglomeration conditions of calcite were determined as follows: pH 10; stirring speed, 1600 rpm; amount of kerosene, 180 l t−1; amount of Na–oleate, 10 kg t−1; solid ratio, 5 wt.%; suspension conditioning time, 2 min; collector stirring time, 1 min and agglomeration time, 5 min. In the optimum conditions, calcite was concentrated with recovery of 94.13 wt.%.

A study on spherical oil agglomeration of barite suspensions

Abstract In this study, the recovery of barite particles was investigated by using oil agglomeration. For this purpose, effects of operating parameters were investigated and also, zeta potential measurements and Fourier Transform Infrared Spectrophotometer (FTIR) analyses have been carried out. In the experiments, effects of operating parameters such as; pH, stirring speed, amount of Na-Oleate as a collector, and kerosene as a bridging liquid, solid concentration, suspension conditioning time, collector stirring time and agglomeration time were investigated to obtain optimum conditions. Zeta potential measurements were carried out depending on pH values and amount of Na-Oleate. FTIR analyses were investigated to determine the adsorption type of Na-Oleate on the barite surface. By the evaluation of the experimental results, optimum oil agglomeration conditions of barite were determined as follows; pH: 10, stirring speed: 1500 rpm, amount of kerosene: 80 l/t, amount of Na-Oleate: 3 kg/t, solid concentration: 5 wt.%, suspension conditioning time: 2 min, collector stirring time: 1 min and agglomeration time: 2 min. In the optimum conditions, barite was concentrated with recovery of 98.07 wt.%.

Increasing Selectivity in Coal Flotation by Controlling Impeller Speed and Collector Concentration

Abstract Batch flotation experiments were conducted using a bituminous coal. It was found out that pulp density and especially impeller speed had significant influences on coal flotation performance, selectivity and rate. Products with lower ash content were obtained at lower speed-higher kerosene concentration levels at the same recovery. Increased flotation rates for coal at higher kerosene concentrations were probably the reason for better selectivity at lower impeller speeds.