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

作　　者：Chao Li Shizhao Wang Yunshan Wang Xuebin An Gang Yang Yong Sun 

机构地区：[1]School of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300130,China [2]National Engineering Research Center of Green Recycling for Strategic Metal Resources,Chinese Academy of Sciences,Beijing 100190,China [3]School of Engineering,Edith Cowan University,270 Joondalup Drive,Joondalup,WA 6027,Australia [4]Key Laboratory of Carbonaceous Wastes Processing and Process Intensification of Zhejiang Province,The University of Nottingham Ningbo China,Ningbo 315100,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第1期117-129,共13页中国化学工程学报（英文版）

基　　金：jointly supported by the National Key Research and Development Program of China (2019YFC1905800);the National Key Research & Development Program of China (2018YFC1903500);the commercial project by Beijing Zhong Dian Hua Yuan Environment Protection Technology Co., Ltd. (E01211200005);the Regional key projects of the science and technology service network program (STS program) of the Chinese Academy of Sciences (KFJ-STS-QYZD-153);the Ningbo Science and Technology Innovation Key Projects (2020Z099, 2022Z028);the Ningbo Municipal Commonweal Key Program (2019C10033);the support of Mineral Resources Analytical and Testing Center, Institute of Process Engineering, Chinese Academy of Science

摘　　要：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.

关 键 词：PHOSPHOGYPSUM Potassium feldspar Coupling reaction LEACHING Waste treatment Kinetics 

分 类 号：X705[环境科学与工程—环境工程]