Method for efficiently removing organic matters in Bayer process aluminum oxide solution

The invention discloses a method for efficiently removing organic matters in a Bayer process aluminum oxide solution, which comprises the following steps of: extracting a Bayer process aluminum oxide production mother solution from a Bayer process aluminum oxide production system, adding an oxidizing agent into the Bayer process aluminum oxide production mother solution, controlling a certain reaction temperature under the combined action of photocatalysis and ultrasonic waves, and removing organic matters in the Bayer process aluminum oxide solution after a period of time. Organic matters in the production mother liquor are crystallized from the mother liquor in the form of oxalate; the treated production mother liquor is subjected to solid-liquid separation and then returns to the aluminum oxide production system again; according to the method, the organic matters in the Bayer process aluminum oxide production mother liquor are efficiently removed, and the color of the treated circulating mother liquor is c