| Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences | Host |
| Citation: |
DI Yanqing, CHEN Yiheng, CAO Yang, CUI Xiaowei, LI Feng, NAN Ning, LIU Xuan. Mechanism of Hydration Reaction of Cementitious Materials Prepared with Molybdenum Tailings and Waste Residue[J]. Conservation and Utilization of Mineral Resources, 2022, 42(6): 101-105. doi: 10.13779/j.cnki.issn1001-0076.2022.06.013
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Mechanism of Hydration Reaction of Cementitious Materials Prepared with Molybdenum Tailings and Waste Residue
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Abstract
Waste cementitious material was prepared with molybdenum tailings, slag, clinker and gypsum as main raw materials. The influence of molybdenum tailings content and curing technology on the mechanical properties of the net pulp test block were studied. The hydration reaction mechanism of the cementitious material of molybdenum tailings was systematically studied with XRD, DTA-TG and SEM. The results showed that when m(molybdenum tailings)∶m(slag)∶m(clinker)∶m(gypsum) was 30∶50∶10∶10, the performance of the test block was relatively good at 60 ℃, and the compressive strength of 28 d could reach 48.4 MPa. The hydration products of the cementing material of molybdenum tailings and waste residues were mainly AFt and C-S-H gel. With the increased of curing age, the hydration products also increase gradually. There were variety of hydration products interweave, intersperse and fill, which promoted the strength of the test block to increase.
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References
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DI Yanqing, CHEN Yiheng, CAO Yang, CUI Xiaowei, LI Feng, NAN Ning, LIU Xuan. Mechanism of Hydration Reaction of Cementitious Materials Prepared with Molybdenum Tailings and Waste Residue[J]. Conservation and Utilization of Mineral Resources, 2022, 42(6): 101-105. doi: 10.13779/j.cnki.issn1001-0076.2022.06.013
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Figure 1.
XRD pattern of molybdenum tailings
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Figure 2.
Effect of cementitious material composition on compressive strength of clean pulp test block
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Figure 3.
Effect of curing process on mechanical properties of cementitious sand test block
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Figure 4.
XRD pattern of net pulp test block of cementitious material mixed with molybdenum tailings
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Figure 5.
DTA-TG curves of cementitious material after hydration for 28 days
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Figure 6.
SEM photos of cementitious material at different curing ages（a—3d；b—7d；c—28d；）