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Citation: Li Deqian, Ji Enrai, Xu Wen, Yu Dingyu, Zeng Guangfu, Ni Jiazuan. EXTRACTION MECHANISM OF RARE EARTH ELEMENTS(Ⅲ),IRON(Ⅲ)AND THORIUM(Ⅳ)FROM SULFURIC ACID SOLUTIONS BY PRIMARY AMINE N₁₉₂₃[J]. Chinese Journal of Applied Chemistry, ;1987, 4(2): 36-41. shu

EXTRACTION MECHANISM OF RARE EARTH ELEMENTS(Ⅲ),IRON(Ⅲ)AND THORIUM(Ⅳ)FROM SULFURIC ACID SOLUTIONS BY PRIMARY AMINE N₁₉₂₃

1.
Changchun Institute of Applied Chemistry, Academia Sinica

Corresponding author: Li Deqian,
Received Date: 23 April 1986
Available Online: 11 September 1986

The extraction mechanism of H₂SO₄ has been determined with the methods of slopeand constant mole. The results are as follows:At low aqueous H₂SO₄ concentrations:RNH_2(o)+2H⁺+SO₄^2-==(RNH₃)₂SO_4(o) (1)At high aqueous H₂SO₄ concentrations:RNH_2(o)+H⁺+HSO₄==(RNH₃)·HSO_4(o) (2) or (RNH₃)₂SO_4(o)+H₂SO₄==2(RNH₃·HSO₄) The composition of the extracted complexes determined by saturated method is(RNH₃)₂SO₄·2.5Hz O and (RNH₃)·HSO₄·2H₂O. In the plot of E% (extraction coefficient) VS Z(atomie number of rare earth element) atypical tetrad effect is found. The position of Y(Ⅲ) in the plots changes with H₂SO₄concentration and it lies between Yb and Lu or after Lu. The extraction mechanism of Ln(Ⅲ) and Fe(Ⅲ) under different aqueous H₂SO₄concentrations is as follows:At low aqueous H₂SO₄ concentrations 1.5(RNH₃)₂SO_4(o)+M³⁺+1.5SO₄^2-==(RNH₃)₃M(SO₄)₃₍₀₎ (3)At high aqueous H₂SO₄ concentrations 1.5(RNH₃·HSO₄)_2(o)+M³⁺+1.5SO₄^2-==)RNH₃)₃M(SO₄)_3(o)+1.5H₂SO₄ (4)where M³⁺ is Nd(Ⅲ), Er(Ⅲ) or Fe(Ⅲ). The composition of the extracted complex is (RNH₃)₃Nd(SO₄)₃·1.5H₂O at low aqueousacidity. However, it may be ((RNH₃)₂Nd(SO₄)₃+RNH₃·HSO₄)·2H₂O at high aqueousacidities. The extraction mechanism of Th(Ⅳ) at low aqueous acidities is as follows:Th⁴⁺+2SO₄^2-+2(RNH₃)₂SO_4(o)==(RNH₃)₄Th(SO₄)_4(o) (5) 1gk_3x=10.44
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EXTRACTION MECHANISM OF RARE EARTH ELEMENTS(Ⅲ),IRON(Ⅲ)AND THORIUM(Ⅳ)FROM SULFURIC ACID SOLUTIONS BY PRIMARY AMINE N1923

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EXTRACTION MECHANISM OF RARE EARTH ELEMENTS(Ⅲ),IRON(Ⅲ)AND THORIUM(Ⅳ)FROM SULFURIC ACID SOLUTIONS BY PRIMARY AMINE N₁₉₂₃