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The increasing global demand for potassic fertilizer, due to the population growth, indirectly forces many countries to search for an alternative source of potassium. The present study reports the recovery of potassium from K-feldspar (K 2 O 12.5 wt. %) through the chlorination roasting—water leaching process applying a mixture of CaCl 2  and NaCl. Individual use of NaCl and CaCl 2  results in the extraction of ∼50% and 92% of potassium, respectively. Though the K-extraction is very high  via  CaCl 2  roasting process, it adds an extra cost to the process as compared with NaCl. However, the use of salt mixture CaCl 2 : NaCl (40:60 wt. %) recovers potassium to the tune of ∼98% at optimum conditions (850 °C, 60 min roasting period, salt mixture: feldspar 1:1). Various experimental parameters such as temperature, time, and salt to feldspar ratio were optimized to recover maximum potassium from the complex structure of K-feldspar. The experimental results are explained using a theoretical extraction model, further supported by characterizations of the samples using XRD, SEM-EDX and FTIR studies.

Thermal treatment of K-feldspar for potassium recovery using NaCl–CaCl 2 mixture and its mechanism study