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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
Published on: February 21, 2017
Mechanical property and structural evolution of alkali-activated slag-phosphate mine tailings mortars
1School of Zijin Mining, Fuzhou University, Fuzhou, Fujian, 350108, China; Fuzhou University-Zijin Mining Group Joint Research Center for Comprehensive Utilization of Mineral Resources, Fuzhou, Fujian, 350108, China.
Abstract:
The present work studies consolidation of phosphate mine tailings through alkaline activation process with the addition of slag for adjusting the gel structure. As increasing slag contents in the raw materials, more (Na,K)2O-CaO-Al2O3-SiO2-H2O (C-A-S-H) and (Na,K)2O-Al2O3-SiO2-H2O (N-A-S-H) gels were formed in the mine tailings-based mortars. Compressive strength of the mortars increased as increasing the slag contents from 0 to 40%, and then it kept a plateau. Evolution in microstructure of these mortars were characterized through scanning electron microscopy (SEM), X-ray diffraction (XRD) and nuclear magnetic resonance (NMR) measurements. The study provides fundamentals for the co-disposal of phosphate mine tailings with blast furnace slag through alkaline activation process.
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