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Potential utilization of copper tailings in the preparation of low heat cement clinker

机译：铜尾矿潜在利用在低热水水泥熟料的制备中

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摘要

In order to avoid environmental pollution from copper tailings (CT), this paper presented a study on potential utilization of CT in the preparation of low heat cement clinker (LHC). The effect of CT addition on the properties of LHC was investigated by using free lime (f-CaO) content test and X-ray diffraction (XRD). Furthermore, to study the hydration properties of LHC paste, the produced LHC samples were mixed with 0.37 wt% gypsum to prepare the LHC paste at a water/binder ratio of 0.30. The compressive strength, hydration process, hydration products of LHC paste and solidification of heavy metals in LHC and the hydrated paste were analyzed. The experimental results showed that CT can be used as a raw material for LHC production. The CT is beneficial for the formation of 2CaO center dot SiO2 (C2S) during the sintering process of LHC. Furthermore, LHC paste with higher CT addition showed lower hydration heat during the first 7 d hydration. With 2 wt% CT added, the hydration of LHC paste can be promoted and the compressive strength was higher than the blank group at the age of 60 d. The leaching tests indicated that heavy metals in CT can be stabilized in LHC and LHC paste during the sintering process and the hydration process. (C) 2020 Elsevier Ltd. All rights reserved.
机译：为了避免从铜尾矿（CT）的环境污染，本文介绍了CT在低热水泥熟料（LHC）中CT的潜在利用研究。通过使用游离石灰（F-CaO）含量试验和X射线衍射（XRD）研究CT添加对LHC性质的影响。此外，为了研究LHC浆料的水化性能，将产生的LHC样品与0.37wt％石膏混合，以在0.30的水/粘合剂比下制备LHC浆料。分析了LHC浆料的抗压强度，水合过程，水合产物和LHC中重金属的凝固和水合浆料。实验结果表明，CT可用作LHC生产的原料。在LHC的烧结过程中，CT对形成2CaO中心点SiO2（C2s）是有益的。此外，具有较高CT添加的LHC浆料在前7d水合过程中显示出较低的水合热。用2wt％CT加入，可以促进LHC糊的水合，并且抗压强度高于60岁的空白组。浸出试验表明，在烧结过程和水合过程中，CT中的重金属可以在LHC和LHC浆料中稳定。 （c）2020 elestvier有限公司保留所有权利。

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  • 来源
    《Construction and Building Materials》 |2020年第20期|119130.1-119130.9|共9页
  • 作者

    Jian Shouwei; Gao Wenbin; Lv Yang; Tan Hongbo; Li Xiangguo; Li Baodong; Huang Weichao;

  • 作者单位

    Wuhan Univ Technol State Key Lab Silicate Mat Architectures Wuhan 430070 Peoples R China;

    Wuhan Univ Technol State Key Lab Silicate Mat Architectures Wuhan 430070 Peoples R China;

    Wuhan Univ Technol State Key Lab Silicate Mat Architectures Wuhan 430070 Peoples R China;

    Wuhan Univ Technol State Key Lab Silicate Mat Architectures Wuhan 430070 Peoples R China;

    Wuhan Univ Technol State Key Lab Silicate Mat Architectures Wuhan 430070 Peoples R China;

    Wuhan Univ Technol State Key Lab Silicate Mat Architectures Wuhan 430070 Peoples R China;

    Wuhan Univ Technol State Key Lab Silicate Mat Architectures Wuhan 430070 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Copper tailings; Low heat cement clinker; Hydration properties; Solidification;

    机译：铜尾矿;低热水泥熟料;水合特性;凝固;

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