In the presence of coal and oxygen, a reaction mostly occurs giving off heat that causes an increase in the coal temperature if not dissipated. So called oxidation process will go on until the mass of coal will ignite. This phenomenon is commonly known as spontaneous combustion. In this study, the results of the previous works carried out to search the liability of Turkish coals to spontaneous heating will be summarised. Additionally, as the objective of the present study, the coal samples from Ilg n District were investigated in terms of liability to spontaneous combustion by the utilisation of the crossing point temperature method.
True flotation deals with only hydrophobic mineral recovery.
Entrainment has an effective role on the recovery of not only hydrophilic but also hydrophobic mineral recoveries. Hydrophilic entrainment could be modelled by relating water recovery with solids recovery. However, direct measurement of the hydrophobic entrainment is not possible. By using different approaches, several mathematical models were developed for the determination of hydrophobic entrainment. In this paper, entrainment models and related approaches were presented.