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Solidification and stabilization of harmful elements in antimony tailings and synergistic utilization of multiple solid wastes
Cement and Concrete Composites ( IF 10.5 ) Pub Date : 2022-08-12 , DOI: 10.1016/j.cemconcomp.2022.104718
Fenghui Wu , Xinxin Liu , Guangfei Qu , Ping Ning , Caiyue Jin , Qingyuan Cui , Yuanchuan Ren , Minjie He , Yuyi Yang , Junyan Li

The massive generation and accumulation of tailings potentially lead to environmental pollution. Antimony tailings (AT) have higher environmental risks than other types of tailings and thus require special attention. Hence, this article used a variety of industrial solid wastes to solidify and stabilize the harmful components in AT. The solidified bodies prepared by adding different ratios of AT were cured under standard and natural curing conditions, and a series of performance tests and leaching toxicity analysis were performed. The results show that the solidified bodies containing 1000 g AT demonstrates excellent mechanical properties after standard curing for 28 d, with a compressive strength of 15 MPa and flexural strength of about 2.5 MPa. The solidified bodies have a water absorption rate of around 27%, softening coefficient of about 0.7, dry density of 900 kg/m3 and wet density of 1100 kg/m3, which meet waterproof and lightweight requirements. In addition, according to leaching toxicity analysis, the solidified bodies meet environmental standards. The bonding effect of needle-shaped ettringite and the encapsulation and filling effect of gelling substance are beneficial to the solidification and stabilization of AT. This article provides theoretical basis and research ideas for AT treatment and disposal.



中文翻译:

锑尾矿中有害元素的固化稳定化与多种固废协同利用

尾矿的大量产生和积累可能导致环境污染。锑尾矿(AT)比其他类型的尾矿具有更高的环境风险,因此需要特别注意。因此,本文利用多种工业固体废弃物对 AT 中的有害成分进行固化和稳定化处理。将添加不同比例AT制备的固化体在标准和自然固化条件下固化,并进行一系列性能测试和浸出毒性分析。结果表明,含 1000 g AT 的固化体在标准养护 28 d 后表现出优异的力学性能,具有抗压强度15 MPa 和约 2.5 MPa 的抗弯强度。固化体吸水率27%左右,软化系数0.7左右,干密度900kg/m 3,湿密度1100kg/m 3 ,满足防水、轻量化要求。此外,经浸出毒性分析,固化体符合环保标准。针状钙矾石的粘结作用和胶凝物质的包封填充作用有利于AT的凝固和稳定化。本文为AT处理处置提供理论依据和研究思路。

更新日期:2022-08-12
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