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黄金科学技术 ›› 2020, Vol. 28 ›› Issue (1): 97-104.doi: 10.11872/j.issn.1005-2518.2020.01.102

• 采选技术与矿山管理 • 上一篇    下一篇

柠檬酸浸法预处理对磷石膏充填体性能的影响

黄照东(),张德明(),刘一锴,张钦礼,王浩   

  1. 中南大学资源与安全工程学院,湖南 长沙 410083
  • 收稿日期:2019-06-28 修回日期:2019-09-03 出版日期:2020-02-29 发布日期:2020-02-26
  • 通讯作者: 张德明 E-mail:huangzhaodong1995@foxmail.com;leo820425@126.com
  • 作者简介:黄照东(1995-),男,云南宣威人,硕士研究生,从事矿山安全及充填技术研究工作。huangzhaodong1995@foxmail.com
  • 基金资助:
    “十三五”国家重点研发计划项目“大型高尾矿库溃坝灾害防控关键技术研究及应用示范”(2017YFC0804605);中南大学自主探索创新项目“井下充填对地下水环境的影响研究”(2019zzts989)

Effect of Citric Acid Immersing Pre-treated on the Performance of the Phosphogypsum Cemented Paste Backfill

Zhaodong HUANG(),Deming ZHANG(),Yikai LIU,Qinli ZHANG,Hao WANG   

  1. School of Resources and Safety Engineering,Central South University,Changsha 410083, Hunan,China
  • Received:2019-06-28 Revised:2019-09-03 Online:2020-02-29 Published:2020-02-26
  • Contact: Deming ZHANG E-mail:huangzhaodong1995@foxmail.com;leo820425@126.com

摘要:

为探究柠檬酸水溶液预处理磷石膏作为充填体材料的可行性,试验采用质量浓度为4%的柠檬酸水溶液对磷石膏进行浸泡预处理,将处理后的磷石膏与未处理的磷石膏分别制备成6种不同配比的试样,先后对标准养护条件下的样本进行了剪切流变测试,7 d、14 d和28 d的单轴抗压强度测试,以及扫描电镜(SEM)测试。试验结果表明:柠檬酸浸法预处理磷石膏充填体较未处理磷石膏充填体单轴抗压强度明显提高,且主要强度形成期在0~7 d,同时,预处理磷石膏可以降低浆体屈服应力,提高浆体易泵性;SEM结果显示,预处理磷石膏充填体的微观结构与未处理磷石膏相比其标志性水化产物的产生量更多,微观结构更加致密。

关键词: 柠檬酸浸法, 磷石膏充填体, 胶结充填, 单轴抗压强度, 流变特性, SEM

Abstract:

In order to explore the feasibility of citric acid Immersing pre-treated phosphogypsum as the cemented paste backfill material,the phosphogypsum was pretreated with citric acid aqueous solution with a mass concentration of 4%. The treated phosphogypsum and the untreated phosphogypsum were respectively prepared into cemented backfill test pieces having a mass concentration of 62% and 64% and a lime-sand ratio of 1∶7,1∶9 and 1∶11. The samples under standard curing conditions were subjected to shear rheology tests,uniaxial compressive strength(UCS) tests at 7 d,14 d,and 28 d,and scanning electron microscopy (SEM)tests. The experimental results show that the uniaxial compressive strength of the pre-treated phosphogypsum filling body is significantly higher than that of the untreated phosphogypsum filling body,and the main strength formation period is 0~7 d. At the same time,the pretreatment of phosphogypsum can reduce the yield stress of the slurry. The SEM results show that the microstructure of the pretreated phosphogypsum filling body is more than that of the untreated phosphogypsum,and the microstructure is more compact. Based on the above research,the use of citric acid leaching to pretreat phosphogypsum in practical industrial applications can greatly reduce the amount of cementitious materials,and improve the slurry transport performance and thus significantly reduce the filling cost,but specific industrial applications need further exploration.

Key words: citric acid immersing, phosphogypsum-cemented paste backfill, cemented filling, single axis compressive strength, rheological properties, scanning electron microscope (SEM)

中图分类号: 

  • TD853

图1

未处理磷石膏粒径分布曲线"

表1

未处理磷石膏化学成分测定结果"

化学成分测定值化学成分测定值
Na2O0.069TiO20.112
MgO0.056Fe2O30.591
Al2O30.657CuO0.015
SiO25.937ZnO0.003
P2O50.883SrO0.079
SO352.55ZrO20.006
K2O0.377BaO0.143

表2

主要试验仪器"

名称规格/型号名称规格/型号
电子分析天平Cp512烧杯-
干燥箱101-0AB电动搅拌机JJ-100W
量筒1 000、500 mL激光粒度仪winer2038A
秒表-养护箱YH-40B
移液管10 mL容量瓶1 L
压力实验机WHY-200/10扫描电镜JSM-6490LV
哈克流变仪VT550充填体模具Φ5.00×h10.00 cm

表3

配比试验方案"

编号磷石膏类别灰砂比(水泥/磷石膏)质量分数/%
1-1未处理磷石膏1∶762
1-21∶764
1-31∶962
1-41∶964
1-51∶1162
1-61∶1164
2-1柠檬酸浸法预处理磷石膏1∶762
2-21∶764
2-31∶962
2-41∶964
2-51∶1162
2-61∶1164

图2

主要试验步骤"

图3

未处理磷石膏与柠檬酸浸法预处理磷石膏充填体单轴抗压强度对比"

图4

未处理磷石膏与柠檬酸浸法预处理磷石膏充填体的单轴抗压强度增长率对比图"

图5

不同配比料浆流变特性曲线"

图6

1-4号充填体和2-4号充填体早期水化产物微观形貌AFm-单硫型水化硫铝酸钙晶体"

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