Recycling flue gas desulfurisation gypsum and phosphogypsum for cemented paste backfill and its acid resistance

Zhang Shiyu; Zhao Yingliang; Ding Hangxing; Qiu Jingping; Guo Zhenbang

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Recycling flue gas desulfurisation gypsum and phosphogypsum for cemented paste backfill and its acid resistance

机译：回收烟气脱硫石膏和磷酸磷膏，用于粘合浆料回填及其耐酸性

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This paper aims to explore the potential use of flue gas desulfurisation gypsum (FGDG) and phosphogypsum (PG) into cemented paste backfill (CPB). The mechanical strength of CPB and the binder paste properties (i.e., hydration heat, hydration evolution, acid erosion resistance, and leachability) were investigated experimentally. The results revealed that the addition of FGDG and PG significantly improved the mechanical performance of CPB by lowering the porosity and increasing the formation of ettringite (AFt) in the early stages. The normalized hydration heat of blended binders was decreased significantly due to replacement of cement with mineral admixtures (i.e., fly ash [FA], FGDG, PG, and quicklime). Dissolved FA decreased the Ca/Si ratio of blended binders, promoted the incorporation of aluminium into the C-S-H gel, and increased the acid erosion resistance. Moreover, the addition of quicklime led to the generation of extra portlandite, which improved the acid erosion resistance. Heavy metals were immobilised by hydration products, and the addition of quicklime further enhanced the stabilisation. The novel binders (SPC + FA + FGDG/PG + quciklime) show prospective application in CPB technology. (C) 2020 Elsevier Ltd. All rights reserved.

机译：本文旨在探讨烟道气脱硫石膏（FGDG）和磷光膏（PG）进入水泥浆料回填（CPB）的潜在使用。实验研究了CPB和粘合剂糊性能的机械强度和粘合剂糊性能（即水合热，水合换液，酸腐蚀性和污垢性）。结果表明，通过降低孔隙率并增加早期阶段的渗透度（AFT）的形成，加入FGDG和PG通过降低CPB的机械性能显着提高了CPB的机械性能。由于用矿物混合物替代水泥（即飞灰[Fa]，FGDG，PG和QuickLime），混合粘合剂的标准化水合热显着降低。溶解Fa降低了混合粘合剂的Ca / Si比，促进铝掺入C-S-H凝胶中，并增加了酸腐蚀性。此外，添加了快速的过程导致了额外的波特兰石的产生，这改善了酸腐蚀性。通过水化产物固定重金属，并加入Quicklime进一步增强了稳定化。新型粘合剂（SPC + FA + FGDG / PG + QUCIKLIME）显示了CPB技术的前瞻性应用。（c）2020 elestvier有限公司保留所有权利。

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《Construction and Building Materials》 |2021年第15期|122170.1-122170.13|共13页
作者
Zhang Shiyu; Zhao Yingliang; Ding Hangxing; Qiu Jingping; Guo Zhenbang;
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作者单位

Northeastern Univ Sch Resource & Civil Engn Shenyang 110819 Peoples R China;

Northeastern Univ Sch Resource & Civil Engn Shenyang 110819 Peoples R China|Northeastern Univ Sci & Technol Innovat Ctr Smart Water & Resource Shenyang 110819 Peoples R China;

Northeastern Univ Sch Resource & Civil Engn Shenyang 110819 Peoples R China;

Northeastern Univ Sch Resource & Civil Engn Shenyang 110819 Peoples R China|Northeastern Univ Sci & Technol Innovat Ctr Smart Water & Resource Shenyang 110819 Peoples R China;

Northeastern Univ Sch Resource & Civil Engn Shenyang 110819 Peoples R China|Northeastern Univ Sci & Technol Innovat Ctr Smart Water & Resource Shenyang 110819 Peoples R China;

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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
Flue gas desulfurisation gypsum; Phosphogypsum; Cemented paste backfill; Hydration reaction; Resistance of acid erosion;

机译：烟气脱硫石膏;磷酸缺口;水泥浆料回填;水合反应;酸腐蚀的抗性;

Recycling flue gas desulfurisation gypsum and phosphogypsum for cemented paste backfill and its acid resistance

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