The effect of magnetic field on the yield of magnetic fraction from ash is studied. The main kinetic parameters of the process by autoclave leaching of the ash in hydrochloric acid (the apparent activation energy, order by the reagent and the rate constant of the reaction) are determinated. Liquor after filtration can be used like coagulant for water treatment. The optimum doses of coagulants, and the effectiveness of their application to reduce turbidity, color, and permanganate oxidation of natural waters containing suspended and organic matter are obtained. Solutions for alumina production are sent to spray drying to obtain amorphous aluminum hydroxide. Physical parameters of alumina (phase composition, specific surface area, average particle size, bulk density, fluidity) depending on the temperature and duration of calcination amorphous aluminum hydroxide are determinated.