Study on synergistic leaching of potassium and phosphorus from potassium feldspar and solid waste phosphogypsum via coupling reactions

Document Type

Journal Article

Publication Title

Chinese Journal of Chemical Engineering

Volume

65

First Page

117

Last Page

129

Publisher

Elsevier

School

School of Engineering

Funders

National Key Reearch and Development Program of China / Beijing Zhong Dian Hua Yuan Environment Protection Technology Co., Ltd. / Regional key projects of the science and technology service network program / Chinese Academy of Sciences / Ningbo Science and Technology Innovation Key Projects / Ningbo Municipal Commonwealth Key Program / Mineral Resources analytical and Testing Center / Institute of Process Engineering / Chinese Academy of Science

Comments

Li, C., Wang, S., Wang, Y., An, X., Yang, G., & Sun, Y. (2024). Study on synergistic leaching of potassium and phosphorus from potassium feldspar and solid waste phosphogypsum via coupling reactions. Chinese Journal of Chemical Engineering, 65, article 117-129. https://doi.org/10.1016/j.cjche.2023.06.020

Abstract

To achieve the resource utilization of solid waste phosphogypsum (PG) and tackle the problem of utilizing potassium feldspar (PF), a coupled synergistic process between PG and PF is proposed in this paper. The study investigates the features of P and F in PG, and explores the decomposition of PF using hydrofluoric acid (HF) in the sulfuric acid system for K leaching and leaching of P and F in PG. The impact factors such as sulfuric acid concentration, reaction temperature, reaction time, material ratio (PG/PF), liquid–solid ratio, PF particle size, and PF calcination temperature on the leaching of P and K is systematically investigated in this paper. The results show that under optimal conditions, the leaching rate of K and P reach more than 93% and 96%, respectively. Kinetics study using shrinking core model (SCM) indicates two significant stages with internal diffusion predominantly controlling the leaching of K. The apparent activation energies of these two stages are 11.92 kJ·mol−1 and 11.55 kJ·mol−1, respectively.

DOI

10.1016/j.cjche.2023.06.020

Access Rights

free_to_read

Link to Full Text

Share

 
COinS