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A review of additives used in the cemented paste tailings: Environmental aspects and application
Journal of Environmental Management ( IF 8.7 ) Pub Date : 2021-04-03 , DOI: 10.1016/j.jenvman.2021.112501
Alieh Saedi , Ahmad Jamshidi-Zanjani , Ahmad Khodadadi Darban

A large amount of mine wastes is generated every year through mining and mineral processing operation. The management of mine tailings is an attractive topic for researchers from both environmental and economic aspects. Mine tailings have shown a capacity as a raw material for the construction industry or a substitution for previous materials to produce the cement. It is applied in some specific environments such as offshores or massive projects like large bridges and tunnels. However, the cement industry has caused a variety of environmental issues. The production of Portland cement on an industrial scale increases the greenhouse effects and generates acidic rains. It releases greenhouse gases by the generation of carbon dioxide. In recent years, strict environmental regulations led to more efforts from mining industries to manage their tailings. A new approach to decrease the environmental issues, improve cement technology and obtain economic benefits is the use of mine tailings for cement production. Mine tailings in the cement mixtures decrease the initial hydration, retard the setting time, and lower the product mechanical strength. These problems can be fixed by the use of additives. Additives as chemical compounds are added to a cemented paste to change its properties and improve its performance. Therefore, the additives in cemented paste tailings can increase the pump-ability, reduce the water-to-cement ratio, increase density, or even adjust setting time and hydration according to the desired purposes. However, the amount of additives in the cemented paste tailings changes based on the type of additive. It should be optimized to cause a positive effect on the cement properties. Furthermore, the additives and their adaptation to the physical and chemical characteristics in cement and tailings is an important issue that should be investigated. In this paper, the usage of several chemical additives was studied, which can strengthen the properties of cemented paste tailings during backfilling operation. It can cause a better condition to decrease the environmental problems for the cement industry and mine tailings. A review of previous works is presented with an explanation of the gaps in previous studies.



中文翻译:

胶浆尾矿中使用的添加剂的综述:环境方面和应用

每年通过采矿和矿物加工操作产生大量的矿山废物。从环境和经济两个方面来看,矿山尾矿的管理对研究人员来说都是一个有吸引力的话题。矿山尾矿已显示出可以用作建筑业的原材料或替代以前的材料来生产水泥的能力。它适用于某些特定环境,例如海上作业或大型项目(例如大型桥梁和隧道)。但是,水泥工业引起了各种各样的环境问题。工业规模生产波特兰水泥会增加温室效应并产生酸性降雨。它通过产生二氧化碳释放温室气体。近年来,严格的环境法规导致采矿业加大了对尾矿的管理力度。减少环境问题,改善水泥技术并获得经济利益的新方法是使用矿山尾矿进行水泥生产。水泥混合物中的矿山尾渣会减少初始水合作用,延缓凝结时间,并降低产品的机械强度。这些问题可以通过使用添加剂来解决。将添加剂作为化学化合物添加到水泥浆中,以改变其性能并改善其性能。因此,水泥糊状尾矿中的添加剂可以提高泵送能力,降低水灰比,增加密度,甚至根据所需目的调整凝结时间和水合度。但是,胶泥尾矿中添加剂的量会根据添加剂的类型而变化。应该对其进行优化,以对水泥性能产生积极影响。此外,添加剂及其对水泥和尾矿中物理和化学特性的适应性是应研究的重要问题。本文研究了几种化学添加剂的使用方法,这些添加剂可增强回填操作过程中胶结尾矿的性能。它可以为减少水泥行业和矿山尾矿带来的环境问题创造更好的条件。回顾了以前的著作,并解释了先前研究中的差距。它可以为减少水泥行业和矿山尾矿带来的环境问题创造更好的条件。回顾了以前的著作,并解释了先前研究中的差距。它可以为减少水泥行业和矿山尾矿带来的环境问题创造更好的条件。回顾了以前的工作,并解释了以前研究中的差距。

更新日期:2021-04-04
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