Secondary aluminum ash for concrete and treatment method thereof

A treatment method of secondary aluminum ash for concrete, comprising the following steps:

• (1) grinding the secondary aluminum ash to obtain ground secondary aluminum ash that has a sieve residue of lower than or equal to 30 wt % when sieved through a 45 μm sieve;
• (2) subjecting the ground secondary aluminum ash to deoxidation;
• (3) mixing deoxidized secondary aluminum ash with an alkali liquor according to a weight ratio of 1:
• (3-10), and reacting at 80° C. to 100° C. for 3 h to 10 h to obtain an intermediate system;
• and
• (4) adding calcium hydroxide and sodium hydroxide to the intermediate system, reacting a resulting system at 100° C. to 200° C. and 0.1 MPa to 1.55 MPa for 2 h to 4 h, conducting solid-liquid separation (SLS), and washing a resulting solid to obtain the finished secondary aluminum ash product for concrete,
• wherein in step (4), an amount of the calcium hydroxide added is 2 wt % to 20 wt % of an amount of the deoxidized secondary aluminum ash and an amount of the sodium hydroxide added is 1 wt % to 5 wt % of the amount of the deoxidized secondary aluminum ash.