Kinetics and Mechanism of Leaching Potassium from Biotite in H2SO4 Solution. Issue 38 (13th October 2020)

• Record Type: Journal Article
• Authors: Ma, Xi; Ma, Hongwen; Yuan, Jiangyan
• Is Part Of: ChemistrySelect. Volume 5:Issue 38(2020)
• Page Start: 11955
• Page End: 11960
• Publication Date: 2020-10-13
• Subjects: biotite -- H2SO4 solution -- leaching kinetics -- mechanism -- potassium; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202003391
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Biotite is a potential potassium mineral resource and the dissolution of biotite in H2 SO4 solution is a green chemistry approach for recovering potassium. To estimate the efficiency of leaching process and to understand the behavior of leaching reactors, the kinetics and mechanism of leaching potassium from biotite in H2 SO4 solution were studied in this work. The leaching experiments show that leached fractions of K2 O increase with the increasing of temperatures and H2 SO4 concentrations, and yet with the decreasing of biotite particle sizes. According to the shrinking core model, the leached fractions of K2 O were fitted better by diffusion through product layer. A kinetics expression of diffusion‐controlled model on three parameters was acquired and it is appropriate to predict the leached fractions of K2 O from biotite in H2 SO4 solution. The dissolution of biotite in H2 SO4 solution was interpreted by electrochemical mechanism coupling with characterization of the acid‐leached residues. This research results can aid in the design of leaching process for recovering potassium sustainably from biotite. Abstract : Recovering potassium from biotite in H2 SO4 solution is prospective for solving the shortage of potassium salt resources in China. The present study focuses on the efficiency of leaching potassium from biotite and the behavior of dissolving biotite in H2 SO4 solution. A kinetics expression determined by diffusion‐controlled shrinking core model is appropriate to predict the leaching efficiency, which is helpful to the design of leaching process for recovering potassium sustainably from biotite.