Preparation of Filling Cementitious Materials with Wet Sorting Steel Slag Mud

Abstract

Abstract: Steel slag mud is the secondary waste slag from converter slag after wet grinding and magnetic separation, which has large storage and is difficult to realize large-scale resource utilization. Steel slag mud as the main raw material cooperating with other industrial solid wastes is used to prepare cementitious materials for mine filling. Orthogonal test of mixture ratio and mechanical property test of steel slag mud cementitious filling materialswere carried out. The hydration mechanism of cementitious materials based on steel slag mud was analyzed by XRD, SEM, FT-IR and other microscopic testing methods. The results show that when steel slag mud content (mass fraction, the same below) is 55%, slag content is 30%, desulfurization gypsum content is 15%, cement-sand mass ratio is 1:4 and slurry concentration is 72%, the 28 d compressive strength of filling materials is 4.78 MPa, which meets the requirements of working performance of mine filling materials. The hydration products of steel slag tailings are mainly C-S-H gel and AFt, and a small amount of Ca(OH)₂. The amount of hydration products C-S-H gel and AFt crystal in the system increases obviously with the increase of hydration age.

Key words: steel slag mud, cementitious material, filling material, hydration reaction, compressive strength, orthogonal test

CLC Number:

TU526
X757

REN Chao, NI Wen, WANG Yonghua. Preparation of Filling Cementitious Materials with Wet Sorting Steel Slag Mud[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(9): 3022-3028.

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