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<p>This study investigates the mechanism of a combined depressant system comprising tannic acid and aminotrimethylenephosphonic acid (ATMP) for the flotation separation of fluorite from calcite. The micro-flotation of pure single minerals was optimized by evaluating key parameters, including depressant characteristics (type, ratio, and dosage), pH, and collector dosage. Optimal separation was achieved at pH 5.0 using 25.0&#xa0;mg/L sodium oleate collector and a combined inhibitor dose of 8.0&#xa0;mg/L ATMP and 2.0&#xa0;mg/L tannic acid. Under these conditions, a synthetic (1:1) mineral mixture yielded a fluorite concentrate with a CaF<sub>2</sub> grade of 76.41% and a recovery of 73.53%, while calcite grade was effectively depressed to 19.69%. The interaction mechanisms on the mineral surfaces were examined through molecular dynamics simulations, microcalorimetry, FTIR, and SEM-EDS. Results demonstrated that the combined inhibitors preferentially and strongly adsorb onto the calcite surface, thereby hindering the adsorption of the sodium oleate collector. This selective interaction increases the hydrophilicity-difference between the two minerals, enabling efficient separation. The ATMP and tannic acid combination presents an effective and environmentally friendly strategy for processing complex fluorite ores.</p>

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Selective Depression of Calcite Using a Combination of Tannic Acid and Aminotrimethylenephosphonic Acid for Enhanced Fluorite Flotation

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Yun Chen,
  • Dongsheng He,
  • Xingjin Liao,
  • Samah S. Abdallah,
  • El-Sayed R. E. Hassan

摘要

This study investigates the mechanism of a combined depressant system comprising tannic acid and aminotrimethylenephosphonic acid (ATMP) for the flotation separation of fluorite from calcite. The micro-flotation of pure single minerals was optimized by evaluating key parameters, including depressant characteristics (type, ratio, and dosage), pH, and collector dosage. Optimal separation was achieved at pH 5.0 using 25.0 mg/L sodium oleate collector and a combined inhibitor dose of 8.0 mg/L ATMP and 2.0 mg/L tannic acid. Under these conditions, a synthetic (1:1) mineral mixture yielded a fluorite concentrate with a CaF2 grade of 76.41% and a recovery of 73.53%, while calcite grade was effectively depressed to 19.69%. The interaction mechanisms on the mineral surfaces were examined through molecular dynamics simulations, microcalorimetry, FTIR, and SEM-EDS. Results demonstrated that the combined inhibitors preferentially and strongly adsorb onto the calcite surface, thereby hindering the adsorption of the sodium oleate collector. This selective interaction increases the hydrophilicity-difference between the two minerals, enabling efficient separation. The ATMP and tannic acid combination presents an effective and environmentally friendly strategy for processing complex fluorite ores.