Stabilising Effect of Steel Slag Modified Synergistically by Multivariate Microorganisms

Abstract

Although the stabilising properties of single microorganism-modified steel slag can meet the specification requirements, its f-CaO content is still high, which limits its further application. To overcome this limitation, this paper proposes the use of multivariate microorganisms to synergistically pre-dispose steel slag to further reduce the f-CaO content in steel slag. Firstly, the synergistic growth and propagation pattern of multivariate microorganisms and their mineralisation ability were investigated, and then the effect of different microorganism dosages on the stability and physical properties of steel slag was studied. The results of the study show that the optimum ratio of Bacillus pasteurus, yeast and carbonic anhydrase bacteria is 5:2:3, at which time the amount of precipitation is 1.81 g. Among the three, Bacillus pasteurus plays the main role, and yeast and carbonic anhydrase bacteria play a synergistic role. When the dosage of multifunctional microorganisms is 60%, the f-CaO content of steel slag disposed of by multifunctional microorganisms is 1.85%, which meets the requirement that the f-CaO content of steel slag be less than 3.0% (specification). The basic properties of water absorption and crushing index of steel slag disposed by multi-functional microorganisms have been improved to different degrees, and compared with the undisposed steel slag, the water absorption and crushing index have been reduced by 27.43% and 4.17%, respectively, and the water-immersed expansion rate has been reduced by 84.27%.

Keywords

multi-microorganisms / steel slag / stability

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Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature