Abstract: We address the influential factors of steel slag carbonization in brakingfree bricks from granularity of steel slag, time of carbonization, gas pressure of carbon dioxide, moisture of material, and pressure of pressing bricks by steel slag brakingfree bricks carbonization experiment for solving the problem of unstable quality of steel slag products.These five factors all have significant impacts on carbonization weight increase and intensity of test bricks in the experimental scope, but the influential tendencies are quite different. XRD, SEM and EDS show that tremendous fine stick like calcium carbonate crystals generate after steel slag carbonization. The autoclave soundness is eligible after carbonization,greater than 15 MPa of compressive strength. Brakingfree brick manufacture by carbonization of steel slagcan absorb greenhouse gas CO2 by full utilization of steel slag, so energy source and cure time are saved. It is therefore an effective path for steel slag utilization.

Key words: pressure of pressing bricks, pressure of carbon dioxide, time of carbonization;moisture of the material, carbonization;granularity of steel slag