Utilization of industrial waste products as pozzolanic material in cemented paste backfill of high sulphide mill tailings
Utilization of industrial waste products as pozzolanic material in cemented paste backfill of high sulphide mill tailings
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DOI：
10.1016/j.jhazmat.2009.02.100
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发表时间：
2009-09-15
影响因子：
13.6
通讯作者：
Alp, Ibrahim
中科院分区：
文献类型：
--
作者：
Ercikdi, Bayram;Cihangir, Ferdi;Alp, Ibrahim
本研究探讨了工业废弃物包括废玻璃（WG）、粉煤灰（FA）的潜在利用。采用粒化高炉矿渣（GBFS）和硅灰（SF）作为火山灰添加剂，部分替代普通波特兰水泥（OPC）用于高硫尾矿胶结充填（CPB）。这些工业废料对CPB的短期和长期机械性能的影响进行了论证。当火山灰废料掺入或增加粘结相中的掺量时，CPB试样的强度发展速率趋于减慢。严重损失（26%）的CPB样品的强度产生完全OPC后发生的初始固化期为56天。观察到添加WG（10-30重量%）作为OPC的部分替代物进一步加剧CPB样品的强度损失。GBFS、FA和SF似乎改善了CPB样品的长期性能;但是，只有GBFS和SF可以仅以一定水平（即至多20重量% GBFS和15重量% SF）掺入粘合剂相中，以在360天内保持0.7MPa的阈值强度水平。扫描电镜研究提供了进一步的洞察CPB的微观结构，并证实了有害的石膏作为膨胀相的形成。这些研究结果表明，包括GBFS和SF的工业废弃物可以适当地用作矿物添加剂，以改善由富含硫化物的尾矿生产的CPB的长期机械性能，以及降低CPB工厂中的粘合剂成本。(C)2009爱思唯尔有限公司版权所有。
In this study, the potential use of the industrial waste products including waste glass (WG), fly ash (FA). granulated blast furnace slag (GBFS) and silica fume(SF) as pozzolanic additive for the partial replacement of ordinary Portland cement (OPC) in cemented paste backfill (CPB) of sulphide-rich mill tailings was investigated. The influence of these industrial waste products on the short- and long-term mechanical performance of CPB was demonstrated. The rate of development of strength of CPB samples tended to slow down when the pozzolanic wastes were incorporated or increased in dosage in the binder phase. Severe losses (by 26%) in the strength of CPB samples produced from exclusively OPC occurred after an initial curing period of 56 days. The addition of WG (10-30 wt%) as a partial replacement of OPC was observed to aggravate further the strength losses of CPB samples. GBFS, FA and SF appeared to improve the long-term performance of CPB samples; albeit, only GBFS and SF could be incorporated into the binder phase only at certain levels i.e. up to 20 wt% GBFS and 15 wt% SF in order to maintain a threshold strength level of 0.7 MPa over 360 days. SEM studies have provided further insight into the microstucture of CPB and confirmed the formation of deleterious gypsum as the expansive phase. These findings have demonstrated that the industrial waste products including GBFS and SF can be suitably used as mineral additives to improve the long-term mechanical performance of CPB produced from sulphide-rich tailings as well as to reduce the binder costs in a CPB plant. (C) 2009 Elsevier B.V. All rights reserved.