The invention discloses a method for efficiently separating
fluorine,
chlorine and
nitrogen components from aluminum ash for co-production of aluminum
oxide concentrate. The method comprises the following steps: putting aluminum ash and water into a reaction kettle, performing
desalination denitrification treatment, performing
solid-liquid separation on
slurry after
desalination denitrification treatment, sufficiently mixing a
solid phase obtained after separation with an alkali liquid, performing a defluorination reaction, performing
filtration, washing and separation on a defluorination
slurry so as to obtain a
solid phase and a
liquid phase, wherein the obtained solid phase is aluminum
oxide concentrate; performing a
neutralization reaction on the
liquid phase by using a diluted acid, and adjusting the pH value of the solution to be neutral; performing a solution defluorination reaction on the blended neutral solution with the
liquid phase obtained after
desalination denitrification; performing a sufficient defluorination reaction on the solution, and performing solid-liquid separation so as to obtain a solid phase, namely a
fluorine salt; and performing
evaporation crystallization on the liquid phase after solid-liquid separation, so as to obtain a
crystallization product, namely a
chlorine salt. Due to the desalination
denitrification process and the defluorination process, products such as
ammonium hydroxide, the
chlorine salt, the
fluorine salt and the high-purity aluminum
oxide concentrate can be prepared, and efficient separation of aluminum oxide, salts and toxicand harmful components in the aluminum ash can be achieved.