Method for treating aluminum ash with caustic soda

The invention discloses a method for treating aluminum ash with caustic soda. The method comprises the following steps: dissolving the aluminum ash with a caustic soda solution to obtain a sodium aluminate crude solution; carrying out desilicication treatment on the sodium aluminate crude solution to obtain a sodium aluminate fine solution; and performing decomposition, solid-liquid separation and washing on the sodium aluminate fine solution to obtain aluminum hydroxide. By means of the method, by-products such as aluminum hydroxide and aluminum oxide can be obtained while the aluminum ash is effectively treated, and effective utilization of resources is achieved. 本发明公开了一种用烧碱处理铝灰的方法，包括以下步骤：将铝灰用烧碱溶液溶解，得到铝酸钠粗液；对所述铝酸钠粗液进行脱硅处理，得到铝酸钠精液；将所述铝酸钠精液进行分解、固液分离、洗涤后，得到氢氧化铝；所述方法能够有效的处理铝灰的同时，得到氢氧化铝、氧化铝等副产品，实现资源的有效利用。