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

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

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To achieve the resource utilization of solid waste phosphogypsum(PG)and tackle the problem of utiliz-ing 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 hydroflu-oric 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.

PhosphogypsumPotassium feldsparCoupling reactionLeachingWaste treatmentKinetics

Chao Li、Shizhao Wang、Yunshan Wang、Xuebin An、Gang Yang、Yong Sun

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School of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300130,China

National Engineering Research Center of Green Recycling for Strategic Metal Resources,Chinese Academy of Sciences,Beijing 100190,China

School of Engineering,Edith Cowan University,270 Joondalup Drive,Joondalup,WA 6027,Australia

Key Laboratory of Carbonaceous Wastes Processing and Process Intensification of Zhejiang Province,The University of Nottingham Ningbo China,Ningbo 315100,China

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国家重点研发计划国家重点研发计划commercial project by Beijing Zhong Dian Hua Yuan Environment Protection Technology Co.,LtdRegional key projects of the science and technology service network program(STS program)of the Chinese Academy of SciencesNingbo Science and Technology Innovation Key ProjectsNingbo Science and Technology Innovation Key ProjectsNingbo Municipal Commonweal Key ProgramMineral Resources Analytical and Testing Center,Institute of Process Engineering,Chinese Academy of Science

2019YFC19058002018YFC1903500E01211200005KFJ-STS-QYZD-1532020Z0992022Z0282019C10033

2024

10.1016/j.cjche.2023.06.020

中国化学工程学报(英文版)
中国化工学会

中国化学工程学报(英文版)

CSTPCDEI
影响因子：0.818
ISSN：1004-9541
年,卷(期)：2024.65(1)
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