Towards understanding the hydration and hardening properties of the cemented paste backfill with a green steel-slag binder

IF 2.7 3区 工程技术 Q3 ENVIRONMENTAL SCIENCES
Bolin Xiao, Aixiang Wu, Jiandong Wang
{"title":"Towards understanding the hydration and hardening properties of the cemented paste backfill with a green steel-slag binder","authors":"Bolin Xiao, Aixiang Wu, Jiandong Wang","doi":"10.1080/17480930.2023.2262251","DOIUrl":null,"url":null,"abstract":"ABSTRACTBinder is the main cost burden in cemented paste backfill (CPB) and an obstacle towards fully green mining technologies. In this work, an improved, low-cost, efficient, and green binder with steel slag content up to 50 wt% was presented for mine backfill. The binder hydration and CPB hardening properties were experimentally investigated. Results show that the CPB with green SS binder (50 wt% steel slag, 35 wt% blast furnace slag, 15 wt% desulphurisation gypsum) has the highest 28-day strength of 2.21 MPa, which is 2 times higher than the Portland CPB control (0.98MPa). The green binder has less hydration heat and a slower and longer deceleration stage duration. The hydration products of the green binder are mainly ettringite and amorphous gel. The substantial gel-like products obtained from multiple activation processes are the mystery of the outstanding CPB strength. The hardening process of green binder CPB can be divided into fast hydrating stage, compacting stage, and potential refining stage. The findings can help better understand the steel slag CPB properties and improve solid waste valorisation and sustainable development of the mining, mineral processing, and iron and steel making industries.KEYWORDS: Cemented paste backfillsteel-slag binderhydration propertieshardening propertiesgreen technology AcknowledgmentsThe authors thank the National Key Research and Development Program of China [grant number 2022YFC300461], and National Natural Science Foundation of China [grant number 52130404] for their financial support.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by the National Key Research and Development Program of China [2022YFC300461]; National Natural Science Foundation of China [52130404].","PeriodicalId":49180,"journal":{"name":"International Journal of Mining Reclamation and Environment","volume":"73 1","pages":"0"},"PeriodicalIF":2.7000,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Mining Reclamation and Environment","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1080/17480930.2023.2262251","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0

Abstract

ABSTRACTBinder is the main cost burden in cemented paste backfill (CPB) and an obstacle towards fully green mining technologies. In this work, an improved, low-cost, efficient, and green binder with steel slag content up to 50 wt% was presented for mine backfill. The binder hydration and CPB hardening properties were experimentally investigated. Results show that the CPB with green SS binder (50 wt% steel slag, 35 wt% blast furnace slag, 15 wt% desulphurisation gypsum) has the highest 28-day strength of 2.21 MPa, which is 2 times higher than the Portland CPB control (0.98MPa). The green binder has less hydration heat and a slower and longer deceleration stage duration. The hydration products of the green binder are mainly ettringite and amorphous gel. The substantial gel-like products obtained from multiple activation processes are the mystery of the outstanding CPB strength. The hardening process of green binder CPB can be divided into fast hydrating stage, compacting stage, and potential refining stage. The findings can help better understand the steel slag CPB properties and improve solid waste valorisation and sustainable development of the mining, mineral processing, and iron and steel making industries.KEYWORDS: Cemented paste backfillsteel-slag binderhydration propertieshardening propertiesgreen technology AcknowledgmentsThe authors thank the National Key Research and Development Program of China [grant number 2022YFC300461], and National Natural Science Foundation of China [grant number 52130404] for their financial support.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by the National Key Research and Development Program of China [2022YFC300461]; National Natural Science Foundation of China [52130404].
探讨绿色钢渣胶结膏体充填体的水化硬化特性
摘要粘结剂是胶结膏体充填开采的主要成本负担,也是实现绿色采矿技术的障碍。本文介绍了一种改进的、低成本、高效、绿色的、钢渣掺量可达50%的矿山回填胶结剂。实验研究了粘结剂的水化性能和CPB硬化性能。结果表明,添加绿色SS粘结剂(50%钢渣、35%高炉渣、15%脱硫石膏)的CPB 28天强度最高,为2.21 MPa,是波特兰CPB对照(0.98MPa)的2倍。绿色粘结剂的水化热较小,减速阶段持续时间较慢且较长。绿色粘结剂的水化产物主要是钙矾石和无定形凝胶。经过多次活化过程获得的大量凝胶样产品是CPB强度突出的奥秘。绿色粘结剂CPB的硬化过程可分为快速水化阶段、压实阶段和潜在精炼阶段。研究结果有助于更好地了解钢渣CPB特性,促进固体废物的增值和采矿、选矿和钢铁工业的可持续发展。感谢国家重点研发计划项目(批准号:2022YFC300461)和国家自然科学基金项目(批准号:52130404)的资助。披露声明作者未报告潜在的利益冲突。基金资助:国家重点研发计划项目[2022YFC300461];国家自然科学基金[52130404]。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
International Journal of Mining Reclamation and Environment
International Journal of Mining Reclamation and Environment ENVIRONMENTAL SCIENCES-MINING & MINERAL PROCESSING
CiteScore
5.70
自引率
8.30%
发文量
30
审稿时长
>12 weeks
期刊介绍: The International Journal of Mining, Reclamation and Environment published research on mining and environmental technology engineering relating to metalliferous deposits, coal, oil sands, and industrial minerals. We welcome environmental mining research papers that explore: -Mining environmental impact assessment and permitting- Mining and processing technologies- Mining waste management and waste minimization practices in mining- Mine site closure- Mining decommissioning and reclamation- Acid mine drainage. The International Journal of Mining, Reclamation and Environment welcomes mining research papers that explore: -Design of surface and underground mines (economics, geotechnical, production scheduling, ventilation)- Mine planning and optimization- Mining geostatics- Mine drilling and blasting technologies- Mining material handling systems- Mine equipment
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信