التفاصيل البيبلوغرافية
| العنوان: |
Application of Anti-Solvent Crystallization for High-Purity Potash Production from K-Feldspar Leaching Solution. |
| المؤلفون: |
Shakibania, Sina, Sundqvist-Öqvist, Lena, Rosenkranz, Jan, Ghorbani, Yousef |
| المصدر: |
Processes; Jul2024, Vol. 12 Issue 7, p1385, 26p |
| مصطلحات موضوعية: |
POTASSIUM chloride, CRYSTAL morphology, ETHYLENE glycol, ISOPROPYL alcohol, ORTHOCLASE |
| مستخلص: |
Potassium-containing feldspars provide a high potential for producing potash, a product with widespread use in agriculture. The present work assesses applying the anti-solvent crystallization method for the purification and recovery of high-purity muriate of potash (KCl) from feldspar leaching solutions. Initially, screening experiments were carried out on a synthetic leaching solution with the aim of analyzing the crystallization behavior of key components. Screening experiments were performed using five anti-solvents, namely methanol, ethanol, acetone, 2-propanol, and ethylene glycol. Acetone and 2-propanol were viable options for crystallization of potassium chloride. Then, the effects of anti-solvent ratio (O/A), time, and anti-solvent addition rate on potassium-chloride crystallization were further investigated using acetone and 2-propanol. A recovery of 83% of potassium was achieved when using acetone at the O/A of 5 with the addition rate of 10 mL/min, at room temperature with a hold time of 180 min. The optimum conditions for 2-propanol were determined to be similar, except for using a 5 mL/min addition rate for 79% recovery. The final muriate of potash products had a purity of over 99.9% using either of the anti-solvent. However, differences in morphology and crystal size of products were observed. Acetone-formed potash crystals were aggregates of cubic crystals with an average size of 3 microns, while 2-propanol-formed potash crystals were 20 microns in size as cubic particles with a hollow core. Despite having almost the same performance in potassium recovery, acetone was found to be a more feasible anti-solvent for potash recovery due to simpler downstream solvent recovery. [ABSTRACT FROM AUTHOR] |
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