INVESTIGATION OF CONCENTRATION OF YOZGAT AYRIDAM LIGNITE BY USING COMMINUTION DIFFERENCE

Bu çalışmada, Yozgat Ayrıdam linyitinin ufalanma farklılığından yararlanılarak zenginleştirilebilirliği araştırılmıştır. Çalışmalar hem kimyasal madde ilave edilmeksizin hem de ilave edilerek yapılmıştır. Kimyasal madde kullanılmadan önemli bir seçimlilik sağlanmazken, kimyasal maddelerle (NH3, N-100), kısmen seçimlilik sağlanmıştır. En iyi bulgular 1000 g/ton N-100 ile sağlanmıştır. Sonuç olarak, öğütme+boyuta göre sınıflandırmayla Yozgat Ayrıdam linyitinin kısmen zenginleştirilebileceği ortaya konmuştur. In this study, concentration of Yozgat Ayrıdam lignite by using differences in comminution rates has been investigated. The testwork has been carried out with and without addition of chemicals. No significant selectivity has been achieved without chemicals and partial selectivity could be obtained with the use of chemicals like NH3, N-100. Best results were obtained with 1000 (g/ton) of N-100. As a result, Yozgat Ayrıdam lignite could be partially concentrated by grinding followed by sizing

Effect of flotation reagents on the wet grinding of celestite concantrate

382-387In this study, the grinding of celestite concentrate in presence of grinding aids, used for celestite ore, flotation has been investigated in a laboratory wet-ball mill as a function of time and concentration of grinding aids. In the experiments, Aero-801, sodium oleate and sodium silicate have been used as grinding aids at the concentrations of 10, 100 and 1000 g/t. While sodium oleate and sodium silicate have beneficial effect in longer grinding times at concentrations of 100 and 1000 g/t, they have adverse effect on grinding at all grinding times at concentration of 10 g/t as evident from particle size. d80 values of ground products are coarser than that without grinding aid. Aero-801 is the best among the grinding aids tested for the concentrations studied. Considering the fineness of the ground products desired, 100 g/t concentration of Aero-801 appears to be proper for grinding of celestite concentrate

Investigation of the performances of classic flotation oils and their mixture in the enrichment of Soma lignite coal by flotation

In the present study, the effects of classical oils (kerosene, fuel oil) and their mixtures (25% Kerosene + 75% fuel oil; 50% Kerosene + 50% fuel oil; 75% Kerosene + 25% fuel oil) on the enrichment of Soma Lignite coal by flotation were investigated. The effects of collector amount on combustible recovery, ash reduction and efficiency index, which are among the parameters that are effective in the enrichment of Soma Lignite coal using both pure and mixed classical oils, were analyzed. In the experiments made with pure oils, the best value in terms of combustible part recovery was obtained with fuel oil. Combustible recovery obtained from experiments with mixtures are higher than those with pure oils. It should be noted that especially in experiments with 25% kerosene + 75% fuel oil, higher combustible recovery values were obtained. According to these results, it shown that depending on the oil or emulsion type, the degree of processes taking place at the coal-air-water interface and the presence of unstable functional groups in the oils seem to significantly affect the flotation performance