Abstract: In the process of raw aluminum production， aluminum preparation and recycling of recycled aluminum， a large number of waste slag would be produced， which is called aluminum industrial slag. Up to now， the disposal method of aluminum industry slag in China is mainly stacking and landfilling. In order to alleviate the environmental problems caused by the accumulation of landfill slag from the aluminum industry and determine the feasibility of preparing aluminum slag to prepare non-fired brick， the effects of different addition amounts of lime， plaster and cement on the mechanical properties of aluminium slag non-fired brick were systematically studied. The micro-morphology and mineral composition of aluminium slag non-fired brick were analyzed by SEM and XRD. The results showed that the compressive strength of non-fired brick made from 65% aluminium slag， 10% lime， 15% plaster and 10% cement was up to 17.31 MPa in 7 days，and the flexural strength was up to 2.61 MPa in 7 days， which met the performance requirements of MU15 grade non-fired brick. Significant hydration reaction occurred inside the non-fired brick， CAH， CSH and Aft produced by hydration reaction were the main sources of mechanical properties of aluminium slag non-fired brick.

Key words: Aluminium slag, Non-fired brick, Mechanical property, Mix proportion