Akademik Veri Yönetim Sistemi
EKOLOJI, cilt.19, sa.76, ss.71-77, 2010 (SCI-Expanded)
Solid-liquid separation in Coal Washing Plants is carried out to decrease fresh water consumption in thickeners obtaining a dense-slurry and to decrease environmental pollution. In this study settling characteristics of the samples were investigated using four different type anionic flocculants and Na(+), K(+), Ca(+2) electrolytes. The samples were taken from the thickener feed of Tuncbilek-Omerler Coal Washing Plant. The dried feed samples of thickener contain 17.1% carbon, 70.2% ash and 2245 kcal/kg of lower calorific value. As a result of the settling experiments, it was determined that electrolytes together with suitable flocculants increase the settling rate. An increase of 38% in settling rate was observed by using 25 gr/t-solid flocculants and 0.05M Ca(+2). This increase is due to bridge formation action of electrolytes between the clay surface and flocculants as well as the decrease in the repulsive forces between the particles. In conclusion, the thickener capacity will be increased by electrolyte and flocculants addition, and less amount of fresh water will be used in the process.