TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compositions: Colloidal fraction of petroleum coke particles comprises 1st petroleum coke particles having particle size of 100 nm to 1 mu m and average particle size of 200-300 nm, and 2nd particles having particle size of 1-10 mu m. The 1st petroleum coke particles of colloidal fraction comprise 20-80% of petroleum coke particles in slurry. Petroleum coke particles comprise 60-70 wt.% of slurry, and water comprises 30-40 wt.% of slurry. Slurry further contains greater than or equal to 1 surfactant selected from nonionic surfactant, ionic surfactant, inorganic salt, and/or organic salt at amount of 500-3000 ppm. Slurry further contains 2nd fraction of carbonaceous material particles having size of 150-400 mu m. The 1st colloidal fraction of petroleum coke particles comprises 58-62 wt.% of slurry. Total amount of 1st colloidal fraction of petroleum coke particles and 2nd fraction of carbonaceous material particles in slurry is 68-72 wt.%. The 2nd fraction of carbonaceous material particles comprises petroleum coke. At least a portion of water is replaced with volatile component, the volatile component selected from methanol, ethanol, propanol, butanol, and/or glycerol. Mass fraction of 2nd fraction of carbonaceous material particles is 25-35% of total coal in slurry. Large fraction of carbonaceous material particles is suspended in colloidal fraction of petroleum coke particles. Slurry further contains 2nd fraction of petroleum coke particles having size of 10-100 mu m. Slurry further contains nano-emulsion of organic liquid or oil. Slurry of petroleum coke in water contains 1st fraction of petroleum coke particles having size of 150-400 mu m and suspended in nano-dispersion of petroleum coke in water, the nanodispersion of petroleum coke in water having nano-sized petroleum coke particles having size of less than or equal to 1 mu m, and micronized petroleum coke particle in which 30-50% of micronized petroleum coke particles have size of 1-4 mu m and slurry is substantially free of sulfur. Fuel or gasification feedstock contains slurry of asphaltene in water consisting of colloidal fraction of asphaltene dispersed in water, asphaltene comprising 50-80 wt.% of slurry, water comprising 20-50 wt.% of slurry, and asphaltene particles having size of less than or equal to 1 mu m. Preferred Parameters: Size ratio of 2nd fraction of carbonaceous material particles to 1st colloidal fraction of petroleum coke particles is greater than or equal to 100. Slurry has viscosity of 350-1000 centipoise at 120 degrees F. The 2nd fraction of petroleum coke particles has average particle size of 1-2 mu m. The 2nd fraction of petroleum coke particles in colloidal fraction has bimodal size.