scholarly journals Study of solid state interactions in the systems ZnFe2O4 - CaO, ZnFe2O4 - MgO and zinc cake with CaO and MgO

2013 ◽  
Vol 49 (3) ◽  
pp. 339-346 ◽  
Author(s):  
A.B. Peltekov ◽  
B.S. Boyanov
Keyword(s):  
Sulfuric Acid ◽  
Solid State ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Xrd Analysis ◽  
Exchange Reactions ◽  
Ssbauer Spectroscopy ◽  
Zinc Hydrometallurgy

The solid state interactions of CaO and MgO with synthetic and industrial ZnFe2O4 (in zinc cake) have been studied using chemical, XRD analysis and M?ssbauer spectroscopy. The exchange reactions in the systems ZnFe2O4 - CaO and ZnFe2O4 - MgO have been investigated in the range of 850-1200?C and duration up to 180 min. It has been established that Ca2+ and Mg2+ ions exchange Zn2+ in ferrite partially and the solubility of zinc in a 7% sulfuric acid solution increases. The possibilities for utilization of the obtained results in zinc hydrometallurgy have been discussed.

scholarly journals Solid state interactions in the systems CaO(CaCO3)-Fe2O3 and CuFe2O4-CaO

2005 ◽  
Vol 41 (1) ◽  
pp. 67-77 ◽  
Author(s):  
B.S. Boyanov
Keyword(s):  
Sulfuric Acid ◽  
Solid State ◽  
Acid Solution ◽  
Diffraction Analysis ◽  
Sulfuric Acid Solution ◽  
Formation Process ◽  
X Ray Diffraction ◽  
Exchange Reactions ◽  
X Ray ◽  
Ferrite Formation

The solid state interactions in the systems CaO(CaCO3)-Fe2O3 and CuFe2O4-CaO have been studied using X-ray diffraction analysis. The influence of the temperature on the ferrite formation process has been investigated in the range of 900-1200 oC and duration up to 360 min. It has been shown that a mixture of ferrites forms at 1000 oC and interaction of 240 min. The exchange reactions in the systems CuFe2O4-CaO and Cu0.5Zn0.5Fe2O4-CaO have been studied, too. It has been established that Ca2+ ions exchange Cu2+ and Zn2 partially and the solubility of copper and zinc in a 7 % sulfuric acid solution increases 10-15 times.

scholarly journals Continuos Operation of Chromium (VI) Recovery from Sulfuric Acid Solution by Liquid Surfactant Membrane.

1991 ◽  
Vol 17 (6) ◽  
pp. 1104-1109 ◽  
Author(s):  
Yasushige Mori ◽  
Shingo Hibin ◽  
Hideyuki Uemae ◽  
Masataka Tanigaki ◽  
Wataru Eguchi
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Chromium Vi
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