Synergistic effect of cupric and ferrous ions on active-passive behavior in anodic dissolution of chalcopyrite in sulfuric acid solutions

2004 ◽  
Vol 74 (1-2) ◽  
pp. 103-116 ◽  
Author(s):  
Naoki Hiroyoshi ◽  
Shigeto Kuroiwa ◽  
Hajime Miki ◽  
Masami Tsunekawa ◽  
Tsuyoshi Hirajima
Keyword(s):  
Sulfuric Acid ◽  
Synergistic Effect ◽  
Anodic Dissolution ◽  
Acid Solutions ◽  
Ferrous Ions ◽  
Passive Behavior ◽  
Sulfuric Acid Solutions

An ac impedance study of the anodic dissolution of iron in sulfuric acid solutions containing hydrogen sulfide

1998 ◽  
Vol 451 (1-2) ◽  
pp. 11-17 ◽  
Author(s):  
Houyi Ma ◽  
Xiaoliang Cheng ◽  
Shenhao Chen ◽  
Chao Wang ◽  
Jiping Zhang ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Sulfuric Acid ◽  
Anodic Dissolution ◽  
Ac Impedance ◽  
Acid Solutions ◽  
Impedance Study ◽  
Sulfuric Acid Solutions

The anodic dissolution of ZnS electrodes in sulfuric acid solutions

1982 ◽  
Vol 9 (1) ◽  
pp. 37-55 ◽  
Author(s):  
Ram A. Narasagoudar ◽  
James W. Johnson ◽  
Thomas J. O'Keefe
Keyword(s):  
Sulfuric Acid ◽  
Anodic Dissolution ◽  
Acid Solutions ◽  
Sulfuric Acid Solutions

ChemInform Abstract: BEHAVIOR OF RUTHENIUM IN THE ANODIC DISSOLUTION OF RUTHENIUM-NICKEL ALLOYS IN SULFURIC ACID SOLUTIONS

1979 ◽  
Vol 10 (36) ◽  
Author(s):  
S. A. SIMANOVA ◽  
L. G. MEL'GUNOVA ◽  
YU. N. KUKUSHKIN ◽  
G. A. SAVEL'EV ◽  
A. M. ORLOV
Keyword(s):  
Sulfuric Acid ◽  
Anodic Dissolution ◽  
Nickel Alloys ◽  
Acid Solutions ◽  
Sulfuric Acid Solutions

scholarly journals Germanium Extraction from Sulfuric Acid Solutions in the Presence of Thiocyanate Ion

2020 ◽  
pp. 542-552
Author(s):  
Natalya A. Grigorieva ◽  
Gani K. Kulmuchamedov ◽  
Isaak Yu. Fleitlikh
Keyword(s):  
Sulfuric Acid ◽  
Synergistic Effect ◽  
High Efficiency ◽  
Practical Interest ◽  
Acid Solutions ◽  
Thiocyanate Ion ◽  
Dithiophosphinic Acids ◽  
Cyanex 301 ◽  
Sulfuric Acid Solutions ◽  
Intracomplex Compound

The extraction of Ge (IV) from sulfuric acid solutions in the presence of thiocyanate ion with various extractants (caprylic, poly(2-ethylhexyl)phosphonitrile, bis(2,4,4-trimethylpentyl) dithiophosphinic acids, trialkylmethylammonium thiocyanate, etc.) has been studied. In all cases, the thiocyanate ion increases germanium extraction as compared to the extraction from sulfuric acid solutions. During the germanium extraction with bis(2,4,4-trimethylpentyl)dithiophosphinic acid (Cyanex 301, HR), a significant increase in the germanium extraction is due to the formation of a cationic intracomplex compound of the composition [Ge(OH)3-nRn]+[HSO4], where n = 1-3. Due to the large synergistic effect for the extraction of Ge, it is possible to use an extractant with a concentration of 0.1-0.15 mol/l. Trialkylmethylammonium thiocyanate (TAMAR), also shows a high efficiency of germanium extraction from sulfate thiocyanate solutions. For 5-6 stages of extraction with a 0.5 M solution of ТАМАР, the extraction of Ge was 99.5 %. The composition of the extracted complex supposedly corresponds to (R4N)2[Ge(CNS)6]. The use of extraction systems based on Cyanex 301 and ТАМАR in the presence of thiocyanate ion significantly reduces the concentration of extractants and is of undoubted practical interest for hydrometallurgical processes for the germanium extraction

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