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<p>Phosphogypsum, a by-product of phosphate fertilizers and phosphoric acid production, is a major solid waste in the chemical industry. This study systematically investigated the leaching behavior of heavy metals (arsenic and antimony) from phosphogypsum stored for various storage durations using sequential chemical extraction, batch experiments, and column experiments. Phosphogypsum were sampled at different storage durations spanning up to 8&#xa0;years from a large-scale phosphogypsum stockpile. The predominant speciation of arsenic and antimony in phosphogypsum is the residual portion. The findings revealed temporal variations in the electrical conductivity, pH, and concentrations of arsenic and antimony in the leachate, with significant concentrations enrichment effects of observed over time. Acid leaching experiments demonstrated that pH changes, particularly in the acidic range, strongly influence the solubility and migration of arsenic and antimony. Column leaching experiments further identified temporal disparities in arsenic and antimony concentrations, with their release mechanisms characterized as wash-out based. This study provides critical insights into the leaching behavior of phosphogypsum at different storage durations, offering a scientific basis for the design of anti-seepage systems, leachate management strategies, and remediation of arsenic and antimony contamination in phosphogypsum stockpile areas.</p>

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Leaching behavior and release mechanism of arsenic and antimony from different storage duration in a phosphogypsum stack

  • 期刊论文

  • 发表日期：

    2025年7月6日

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  • Jun Huang,
  • Chao Ma,
  • Tao Jin,
  • FengJuan Liu,
  • KeXiang Li,
  • JunCai Wang

摘要

Phosphogypsum, a by-product of phosphate fertilizers and phosphoric acid production, is a major solid waste in the chemical industry. This study systematically investigated the leaching behavior of heavy metals (arsenic and antimony) from phosphogypsum stored for various storage durations using sequential chemical extraction, batch experiments, and column experiments. Phosphogypsum were sampled at different storage durations spanning up to 8 years from a large-scale phosphogypsum stockpile. The predominant speciation of arsenic and antimony in phosphogypsum is the residual portion. The findings revealed temporal variations in the electrical conductivity, pH, and concentrations of arsenic and antimony in the leachate, with significant concentrations enrichment effects of observed over time. Acid leaching experiments demonstrated that pH changes, particularly in the acidic range, strongly influence the solubility and migration of arsenic and antimony. Column leaching experiments further identified temporal disparities in arsenic and antimony concentrations, with their release mechanisms characterized as wash-out based. This study provides critical insights into the leaching behavior of phosphogypsum at different storage durations, offering a scientific basis for the design of anti-seepage systems, leachate management strategies, and remediation of arsenic and antimony contamination in phosphogypsum stockpile areas.