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EFFECTS OF PH AND SALT CONCENTRATION ON OIL AGGLOMERATION OF BITUMINOUS COAL
Abstract
In this study, batch agglomeration tests were conducted with Zonguldak bituminous coal to determine the effects of kerosene concentration, pH and salt concentration. In the evaluation of experimental results, the turbidity values were used. In the experiments, oil concentrations of 5, 10, 15 and 20\% by weight were used. The low turbidity values were obtained at oil concentration of 20\% by weight. Between pH 3 and 11, the change of the turbidity values were investigated. At the low and high pH values, turbidity values increased. The lowest turbidity value was obtained at pH в€ј7 (pH of tap water). The ionic strength of medium was increased by using NaCl. It was shown that ionic strength had an important effect on the extent of agglomeration at low oil concentration. As a result, the change of turbidity can be used to determine of agglomeration behaviour of bituminous coal in different conditions.
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References9
. 0123 Salt Concentration (M) Relative Turbidity Change (%) Kerosene Con. (15%wt) Kerosene Con. (20%wt) Figure 4. Effect of salt concentration on extent of agglomeration. An increase in salt concentration from 0.5 to 1.0 M produced a much great er increase in the extent of agglomeration for a given oil concentration. However, an increase in salt concentration from 0 to 2.0 M produced a
63 % increase in the extent of aggl omeration in the oil concentration of
wt%, while it produced a 21.9 3 % increase in the extent of agglomeration in the oil concentration of 20 wt%. These findings showed that the relative increases in the extent of agglomeration were higher with lower oil concentration. Further improvement in the extent of aggl omeration can be achieved with determination of optimum conditions of the operating parameters.
CONCLUSIONS The conclusions obtained from this study are as follows: * The maximum extent of agglomeration was obtained at kerosene conce ntration of 20 wt% from the studied kerosene concentration. * In the low and high pH values the extent of agglomeration decrease d. The optimum pH value was found to be 7.0. * Increasing the salt concentration of the aqueous medium increased he extent of agglomeration of Zonguldak bituminous coal. * The extent of agglomeration of Zonguldak bituminous coal was und to depend on the pH and ionic strength of the aqueous medium and kerosene concentration. * Coal recovery for a batch agglomeration process was shown to be irectly proportional to the relative turbidity change.
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