Inorganic Chemicals Industry >
Study on leaching process and kinetics of zinc extraction from metallurgical slag and dust with ammonia
Received date: 2020-05-17
Online published: 2020-12-01
Zinc metallurgical slag and dust is an important secondary resource,it has the advantages of wide source,large re-serves and high comprehensive recycling value.The influence of particle size,reaction time,stirring speed,liquid-solid ratio,total ammonia concentration,amount-of-substance ratio of NH3 to NH4+ and temperature on the zinc leaching rate were investi-gated in NH3-CH3COONH4-H2O system.The results showed that the control leaching temperature of 25 ℃,total ammonia co-ncentration of 5 mol/L,liquid-solid volume-mass ratio of 5 mL/g,amount-of-substance ratio of n（NH3）/n（NH4+）=1:1,stirring speed of 300 r/min and leaching time for 60 min,then the zinc leaching rate reached 84%.The leaching kinetic analysis of metallurgical slag and dust indicated that the apparent activation energy of the reaction was 22.66 kJ/mol.The leaching rate of zinc was controlled by both solid film diffusion and interfacial chemical reaction,and the kinetic rate equation of zinc leaching was obtained.
Key words： zinc; metallurgical slag and dust; ammonia leaching
Aiyuan Ma , Xuemei Zheng , Song Li . Study on leaching process and kinetics of zinc extraction from metallurgical slag and dust with ammonia[J]. Inorganic Chemicals Industry, 2020 , 52(11) : 69 -74 . DOI: 10.11962/1006-4990.2019-0643
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