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Citation: Yue Santang, Li Deqian. KINETICS AND MECHANISM OF EXTRACTION OF ERBIUM(Ⅲ) FROM SULPHURIC ACID SOLUTIONS WITH HEH[EHP][J]. Chinese Journal of Applied Chemistry, ;1990, 7(3): 1-5. shu

KINETICS AND MECHANISM OF EXTRACTION OF ERBIUM(Ⅲ) FROM SULPHURIC ACID SOLUTIONS WITH HEH[EHP]

Yue Santang ,
Li Deqian

1.
Laboratory of Rare Earth Chemistry and Physics of Changchun. Institute of Applied Chemistry, Academia Sinica, Changchun 130022

Received Date: 22 June 1989
Available Online: 23 October 1989
Fund Project:

The kinetics of extraction erhium(Ⅲ)from sulphurib acid solutions with HEHl[EHP] in n-heptane has been investigated. The effects of the concentrations of Er³⁺,H⁺,SO₄^2-,and HEH[EHP] on the extraction rate for Er(Ⅲ) have been observed. It is found that the rate of forward extraction reaction is proportional to[Er³⁺],[H⁺]^-2.25,[SO₄^2-]^0.26 and [H₂A₂]_(o)^1.69,white the rate of backward extraction reaction is proportional to [Er(Ⅲ)]_(o),[H⁺]^1.05 and [H₂A₂]_(o)^-1.08.The rate-determining step is suggested to be the chemical reaction of ErA₂ with HA at the interface for forward extraction and H~+ with ErA_3(o) at the inter-face for backward extraction.
- erbium,
- HEH[EHP],
- extraction,
- kinetics
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