Preparation and Characterization of Composite Cementitious Material Based on Electrolytic Manganese Residue-Phosphogypsum

Abstract

Abstract: In order to effectively improve the resource utilization level of electrolytic manganese residue, according to the chemical composition and mineral composition characteristics of electrolytic manganese residue, the electrolytic manganese residue was used as the main raw material, and the cementitious material was prepared by supplementing phosphogypsum, cement and slag powder. On the basis of fixing the slag and cement content, by changing the content of phosphogypsum, the effect of different sulfate content on the mechanical properties of composite cementitious materials was studied. The research results show that the best quality ratio of electrolytic manganese residue, phosphogypsum, slag powder and cement in the prepared composite cementitious material is 50:20:20:10, and the 14 d compressive strength of the hardened body reaches 20.62 MPa, and the softening coefficient is 0.80. The hydration products of electrolytic manganese residue-phosphogypsum composite cementitious material are mainly ettringite, C-S-H and C-A-S-H. The concentration of pollutants in the leachate of the hardened body after hydration for 14 d is within the limits of the standard of Class V water in the "Surface water environmental quality standard" (GB 3838—2002). The concentration of Cr, Cu, Zn, As, Pb, Cd and other heavy metals can reach the standard of Class I water, and the hardened body has good environmental stability.

Key words: electrolytic manganese residue, phosphogypsum, composite cementitious material, hydration product, heavy metal, solidification

CLC Number:

X781.1
TQ177

ZHANG Xin, LIU Fang, ZHU Jian, CHEN Zuyong. Preparation and Characterization of Composite Cementitious Material Based on Electrolytic Manganese Residue-Phosphogypsum[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(5): 1610-1619.

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