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  • CN 62-1112/TF 
  • ISSN 1005-2518 
  • 创刊于1988年
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采选技术与矿山管理

含硫酸盐废水对磷石膏胶结充填体材料性能的影响

  • 石英 ,
  • 聂锐洋 ,
  • 周诗彤 ,
  • 陆思成 ,
  • 卿子萱
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  • 中南大学资源与安全工程学院,湖南 长沙 410083
石英(1984-),女,湖南长沙人,教授,从事固体废弃物胶结处理技术及环境影响研究工作。shiyingfriend@csu.edu.cn

收稿日期: 2023-12-11

  修回日期: 2024-03-29

  网络出版日期: 2024-07-05

基金资助

国家自然科学基金面上项目“骨料磷石膏对胶结充填体材料性能影响及改性研究”(42177160)

Effect of Sulfate-Containing Wastewater on the Properties of Phosphogypsum-Based Cemented Paste Backfill

  • Ying SHI ,
  • Ruiyang NIE ,
  • Shitong ZHOU ,
  • Sicheng LU ,
  • Zixuan QING
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  • School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China

Received date: 2023-12-11

  Revised date: 2024-03-29

  Online published: 2024-07-05

摘要

鉴于矿山废水处理工艺具有一定的局限性,且磷石膏充填工艺需要消耗大量的水资源,将矿山含硫酸盐废水作为磷石膏充填用水并探讨其可行性。结果表明:废水中的硫酸盐能够促进磷石膏充填体的早期水化反应,进而提升充填体早期强度。当浓度从0增加至30 000 mg/L时,充填体7 d强度由0.46 MPa升高至0.63 MPa,提高了37%;14 d强度由0.64 MPa升高至1.03 MPa,提高了61%。这主要跟水化产物钙矾石(AFt)和水化硅酸钙(C-S-H)的形成有关;但随着养护时间的增长,充填体28,60,90 d强度均在硫酸盐浓度为15 000 mg/L时达到最高。过量的会干扰水化硬化过程,充填体后期强度因受到钙矾石的膨胀特性以及Na2SO4重结晶等影响而出现下降。研究结果可为矿山废水治理和磷石膏充填工艺优化提供新思路。

本文引用格式

石英 , 聂锐洋 , 周诗彤 , 陆思成 , 卿子萱 . 含硫酸盐废水对磷石膏胶结充填体材料性能的影响[J]. 黄金科学技术, 2024 , 32(3) : 416 -424 . DOI: 10.11872/j.issn.1005-2518.2024.03.168

Abstract

Based on the limitation of mine wastewater treatment process and the large demand for water resources in phosphogypsum backfill process,the feasibility of using sulfate-containing mine wastewater as phosphogypsum backfill water was discussed.Results show that the sulfate present in the wastewater promoted the early hydration of the phosphogypsum-based cemented paste backfill,consequently enhancing its early strength.Specifically,as the sulfate concentration increased from 0 to 30 000 mg/L,the 7-day strength of the backfill samples increased from 0.46 MPa to 0.63 MPa,representing a 37% increase.The 14-day strength also exhibited a significant increase from 0.64 MPa to 1.03 MPa,indicating a 61% increase.This can mainly be attributed to the formation of hydration products such as ettringite and C-S-H.However,with the increase of the curing time,the 28-day,60-day,and 90-day strength of the backfill samples reach the highest values at a sulfate concentration of 15 000 mg/L.Excess sulfate ions can interfere with the hydration and hardening processes,and the long-term strength of the backfill is affected by the expansion caused by AFt and the recrystallization of Na2SO4 and other influences,resulting in a decrease in the strength of backfill samples.The results can provide a new insight into mine wastewater treatment and phosphogypsum-based cemented paste backfill technology.

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