Acidulated pegmatitic mica: A promising new multi-nutrient mineral fertilizer

  title={Acidulated pegmatitic mica: A promising new multi-nutrient mineral fertilizer},
  author={Thisara Weerasuriya and S. Pushpakumara and Prasad Cooray},
  journal={Fertilizer research},
Scrap grade pegmatitic phlogopite mica contains 5–7% K (∼8% K2O), 10–14% Mg (∼23% MgO), 1–2% Ca (∼2.9% CaO), 0.03% Mn and 109 ppm Zn. On acidulation upto 65% of K and Mg and 15–100% Mn and Zn were recovered. Less than 13% of Ca was recovered in solution. Water soluble and Nh4OAc extractable K and Mg of acidulated mica of pegmatitic origin increased a 102 to 103 times compared to untreated mica. Acidulated mica remained non-hygroscopic even when mixed with acids at a 2:1 mica to acid ratio. X… CONTINUE READING


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