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ZONG Shaokang,CHU Xuewei,ZHANG Jiaxin,et al. Experimental of dissolution damage to carbonate rocks by acidic phosphate gypsum leachate[J]. Bulletin of Geological Science and Technology,2025,44(0):1-10 doi: 10.19509/j.cnki.dzkq.tb20230633
Citation: ZONG Shaokang,CHU Xuewei,ZHANG Jiaxin,et al. Experimental of dissolution damage to carbonate rocks by acidic phosphate gypsum leachate[J]. Bulletin of Geological Science and Technology,2025,44(0):1-10 doi: 10.19509/j.cnki.dzkq.tb20230633

Experimental of dissolution damage to carbonate rocks by acidic phosphate gypsum leachate

doi: 10.19509/j.cnki.dzkq.tb20230633
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  • Author Bio:

    E-mail:z13930715698@126.com

  • Corresponding author: E-mail:28409807@qq.com
  • Received Date: 09 Nov 2023
  • Accepted Date: 01 Feb 2024
  • Rev Recd Date: 26 Jan 2024
  • Available Online: 28 Feb 2024
  • <p>Strongly acidic wastewater is highly corrosive to carbonate rocks, which can lead to significant changes in the physical and mechanical properties of carbonate rocks. </p></sec> <sec><title>Objective

    In order to study the dissolution damage and mechanical damage of carbonate rock by acidic filtration solution.

    Methods

    In this paper, through carrying out different flow conditions, different time length of phosphogypsum acidic leaching solution on the dissolution of limestone test research, analyze before and after the test of limestone specimens of the apparent characteristics, quality, porosity, uniaxial compressive strength, and acoustic emission counts and other indicators of the law of change, revealing the impact of the acidic leaching solution on the physical and mechanical properties of the carbonate rock.

    Results

    The test results show that the dissolution rate and porosity increment of the rock samples are positively correlated with the dissolution time and the flow rate of filtration solution, and the mechanical strength is negatively correlated with the dissolution time and the flow rate of filtration solution. With the dissolution, the surface of the rock samples will be attached with thicker and thicker fluorite minerals, which makes the dissolution rate of the rock samples slower. The damage form of the uniaxial specimen gradually changed from shear damage to tensile damage. Under the acidic environment of phosphogypsum leachate dissolution, the internal mineral composition of limestone is dissolved, which causes changes in macro-mechanical parameters.

    Conclusion

    The research results can provide theoretical and experimental data for the stability analysis of karst media under the influence of acidic wastewater, acidic wastewater treatment, and tailing project safety design.

     

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