NOVELTY - Lime-removal coal-dressing of wood coal, is carried out by using the difference between wettability on particle surface, and classifying coal organic and inorganic substances (8,9) of wood-coal powder (1). Hydrophobicity is improved with respect to wettability of coal organic substance, and water (12) and oil-based scavenger (15) are added to the slurry (14). Shearing force is applied, and water film containing organic/inorganic substances and scavenger oil drops is peeled off. A foaming agent is added, and organic/inorganic substances are classified and separated.    USE - Lime-removal coal-dressing of wood coal useful as fuel in diesel engines.    ADVANTAGE - The method enables reliable separation and classification of organic and inorganic substances from wood coal by floatation, and provides wood coal with low ash content.    DETAILED DESCRIPTION - Lime-removal coal-dressing of wood coal, is carried out by using the difference between wettability on the surface of particles, and classifying and separating coal organic substance and coal inorganic substance of wood-coal powder. Hydrophobicity is improved with respect to wettability of coal organic substance, and water is added to wood-coal powder to obtain a slurry. An oil-based scavenger is added to the slurry, shearing force is applied to the slurry to increase the surface energy of particles, and water film containing coal organic substance, coal inorganic substance, and scavenger oil drops is peeled off. Based on the surface-energy improvement, coal organic substance and oil drops are raised more, hydrophobicity on the surface of particles and lipophilicity are increased further, and the water film layer on the particle surface of coal organic substance is replaced with scavenger oil film, while surface energy is reduced. A foaming agent is added to the slurry and foam is produced by blowing-in air into the slurry. The coal organic substance and coal inorganic substance are classified and separated when the damp coal inorganic substance precipitates, and the coal organic substance floats up with the oil film adhering surrounding the foam. An INDEPENDENT CLAIM is included for lime-removal coal-dressing apparatus (A) of wood coal.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of the lime-removal coal-dressing method and lime-removal coal-dressing apparatus of wood coal.    Wood-coal powder (1)    Coal organic substance (8)    Coal inorganic substance (9)    Water (12)    Slurry (14)    Scavenger (15)    Lime-removal coal-dressing apparatus of wood coal (A)