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黄金科学技术 ›› 2024, Vol. 32 ›› Issue (3): 416-424.doi: 10.11872/j.issn.1005-2518.2024.03.168

• 采选技术与矿山管理 • 上一篇    下一篇

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   

  1. 中南大学资源与安全工程学院,湖南 长沙 410083
  • 收稿日期:2023-12-11 修回日期:2024-03-29 出版日期:2024-06-30 发布日期:2024-07-05
  • 作者简介: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
  • 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   

  1. School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China
  • Received:2023-12-11 Revised:2024-03-29 Online:2024-06-30 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。

关键词: 环境影响, 硫酸盐废水, 磷石膏, 水化反应, 胶结充填, 抗压强度

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.

Key words: environmental impact, sulfate-containing wastewater, phosphogypsum, hydration reaction, cemen-ted backfill, compressive strength

中图分类号: 

  • TD803

图1

磷石膏和胶凝剂的粒径分布"

表1

磷石膏和胶凝剂的化学成分"

化学成分磷石膏/%胶凝剂/%
SO355.005.40
CaO37.6951.44
P2O52.611.58
SiO21.7623.31
F1.401.00
Al2O30.474.97
MgO0.411.70
Fe2O30.252.60
K2O0.050.97

图2

不同浓度和养护时间下充填体样本的无侧限抗压强度"

图3

充填体扫描电镜—X射线能谱分析图(a)浓度为0;(b)浓度为15 000 mg/L;(c)EDS-C-S-H;(d)EDS-钙矾石"

图4

Na2SO4在充填体表面重结晶析出"

图5

磷石膏浆、充填料浆和充填体毒性浸出液中浓度随制浆用水中浓度的变化规律"

图6

磷石膏浆、充填料浆和充填体毒性浸出液中pH值随制浆用水中浓度的变化规律"

图7

磷石膏浆、充填料浆、充填体毒性浸出液中可溶性磷浓度随制浆用水中浓度的变化规律"

图8

磷石膏浆、充填料浆、充填体毒性浸出液中F-浓度随制浆用水中浓度的变化规律"

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