Effect of Citric Acid Immersing Pre-treated on the Performance of the Phosphogypsum Cemented Paste Backfill
Received date: 2019-06-28
Revised date: 2019-09-03
Online published: 2020-02-26
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.
Zhaodong HUANG , Deming ZHANG , Yikai LIU , Qinli ZHANG , Hao WANG . Effect of Citric Acid Immersing Pre-treated on the Performance of the Phosphogypsum Cemented Paste Backfill[J]. Gold Science and Technology, 2020 , 28(1) : 97 -104 . DOI: 10.11872/j.issn.1005-2518.2020.01.102
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