College of Resources and Civil Engineering, Northeastern University, Shenyang, China; Science and Technology Innovation Center of Smart Water and Resource Environment, Northeastern University, Shenyang, China.
College of Resources and Civil Engineering, Northeastern University, Shenyang, China; Science and Technology Innovation Center of Smart Water and Resource Environment, Northeastern University, Shenyang, China.
J Environ Manage. 2021 Dec 15;300:113760. doi: 10.1016/j.jenvman.2021.113760. Epub 2021 Sep 14.
Cemented paste backfill (CPB) favors the sustainable development of mine industry. However, as the primary cementitious binders in CPB, the high cost of ordinary Portland cement (OPC) discourages CPB utilization. In the present work, low-carbon and low-cost binders activated by NaCO supplemented by calcined quarry dust were used in CPB. The binder was prepared using a 'one-part' method. It was found that binders prepared using 8% NaCO and 5% CQD show the best performance. The superior properties of the binders were attributed to the promoted binder hydration and special phase assembles of the hydration products. Cost and carbon emission analysis showed that NaCO activated binder was cheaper and greener. The cost and CO emission of binder B8Q5 were lower than OPC by around 34.16% and 87.76%, respectively. Besides, leaching tests showed that all the toxic metals were stabilized, which posed no environmental risk.
胶结充填料浆（CPB）有利于矿业的可持续发展。然而，作为 CPB 的主要胶凝材料，普通波特兰水泥（OPC）的高成本阻碍了 CPB 的应用。在本工作中，使用 NaCO 激活的低碳低成本胶凝材料，并辅以煅烧采石场粉尘，用于 CPB。采用“单组分”法制备了胶凝材料。结果发现，使用 8%的 NaCO 和 5%的 CQD 制备的胶凝材料性能最佳。胶凝材料的优异性能归因于促进了胶凝材料的水化以及水化产物的特殊相组装。成本和碳排放分析表明，NaCO 激活的胶凝材料更便宜、更环保。胶凝材料 B8Q5 的成本和 CO 排放量比 OPC 分别低约 34.16%和 87.76%。此外，浸出试验表明，所有的有毒金属都得到了稳定，不会对环境造成风险。
