scholarly journals The kinetic profile of iron dissolution from laterite ore in chloric acid solution

2019 ◽  
Vol 22 (1) ◽  
pp. 20-37
Author(s):  
Solihin Solihin ◽  
◽  
Pratama Arinaldo ◽  
Nanda Dewi ◽  
Haryadi Permana ◽  
...  
Keyword(s):  
Acid Solution ◽  
Chloric Acid ◽  
Iron Dissolution ◽  
Kinetic Profile ◽  
Chloric Acid Solution ◽  
Laterite Ore

Impedance investigation of the anodic iron dissolution in perchloric acid solution

2002 ◽  
Vol 44 (6) ◽  
pp. 1177-1191 ◽  
Author(s):  
Houyi Ma ◽  
Guiqiu Li ◽  
Shenhao Chen ◽  
Shiyong Zhao ◽  
Xiaoliang Cheng
Keyword(s):  
Acid Solution ◽  
Perchloric Acid ◽  
Perchloric Acid Solution ◽  
Iron Dissolution

scholarly journals Molecular structure in correlation with electrochemical properties of mixed-ligand cobalt(III) complexes

2008 ◽  
Vol 73 (7) ◽  
pp. 761-770 ◽  
Author(s):  
K. Babic-Samardzija ◽  
V.M. Jovanovic ◽  
S.P. Sovilj
Keyword(s):  
Molecular Structure ◽  
Spectral Analysis ◽  
Molecular Modeling ◽  
Acid Solution ◽  
Electrochemical Properties ◽  
Reduction Reaction ◽  
Mixed Ligand ◽  
Iron Electrode ◽  
Perchloric Acid Solution ◽  
Iron Dissolution

Four mixed-ligand cobalt(III) complexes (1-4) of the general formula [Co(Rdtc)cyclam](ClO4)2 and [Co(Rac)cyclam](ClO4)2 (cyclam = 1,4,8,11-tetra- azacyclotetradecane; Rdtc = thiomorpholine-(Timdtc) or 2-methylpiperidine-(2-Mepipdtc) dithiocarbamates; Rac = 1,1,1,5,5,5-hexafluoro-2,4-pentanedionato (Hfac) or 2,2,6,6-tetramethyl-3,5-heptanedionato (Tmhd), respectively) were electrochemically examined on a glassy carbon and an iron electrode in perchloric acid solution. The obtained results showed the influence of these complexes on hydrogen evolution, the oxygen reduction reaction and iron dissolution. The exhibited effects of the complexes on these reactions depend on structure related to the bidentate dithiocarbamato or b-diketonato ligand. The electrochemical properties of the complexes were correlated with molecular structure and parameters derived from spectral analysis and molecular modeling. .

CIRCULAR PAPER CHROMATOGRAPHIC METHOD FOR DETERMINING TRACE AMOUNTS OF COBALT, COPPER, NICKEL, AND ZINC IN ROCKS AND SOILS

1965 ◽  
Vol 2 (2) ◽  
pp. 33-43 ◽  
Author(s):  
D. C. Mah ◽  
S. Mah ◽  
W. M. Tupper
Keyword(s):  
Acid Solution ◽  
Paper Chromatography ◽  
Chloric Acid Solution ◽  
Rubeanic Acid ◽  
Circular Paper ◽  
Color Indicator ◽  
Higher Sensitivity ◽  
Circular Chromatography ◽  
Cobalt Copper

Ascending, descending, and horizontal (circular) methods of paper chromatography were explored and compared. Circular chromatography was found to be the most suitable; it requires shorter development time, has more definite Rf values, less tailing, higher sensitivity, and better precision than ascending or descending methods.A methyl ethyl ketone: hydrochloric acid solution (93:7 v/v) is used as a developing solvent for cobalt, copper, and nickel, and a 1-butanol: 1 N hydro–chloric acid solution (7:3 v/v) is used as a solvent for zinc. Good separations were obtained with these solvents and no critical interferences were noted. Benzidine – rubeanic acid is used as a color indicator for cobalt, copper, and nickel; and dithizone (0.01%) for zinc. This method has an absolute sensitivity of 0.005 μg for zinc, and 0.02 μg for cobalt, copper, and nickel. Precision is estimated at ± 10%.Methods have also been developed for determining bismuth, silver, and tin.The separation of elements from complex mixtures by paper chromatography and by quantitative determination of the amounts present by emission spectrography have been investigated. This rarely considered process offers promise, because the sensitivity of several elements is higher in emission spectrography than in colorimetry.

Extended Preservation of Iron for Transmission

1967 ◽  
Vol 25 ◽  
pp. 354-355
Author(s):  
E. P. Abrahamson II ◽  
M. W. Dumais
Keyword(s):  
Acid Solution ◽  
Perchloric Acid ◽  
Microscopy Study ◽  
Perchloric Acid Solution ◽  
Transmission Microscopy ◽  
Iron Base ◽  
Cold Stage

In a transmission microscopy study of iron and dilute iron base alloys, it was determined that it is possible to preserve specimens for extended periods of time. Our specimens were prepunched from 5 to 8 mil sheet to microscope size and annealed for several hours at 700°C. They were then thinned in a glacial acetic-12 percent perchloric acid solution using 10 volts and 20 milliamperes, at a temperature of 8 to 14°C.It was noted that by the use of a cold stage, the same specimen can be observed for periods up to one week without excess contamination. When removal of the specimen from the column becomes necessary, it was observed that a specimen may be kept for later observation in 1,2 dichloroethene or methanol for periods in excess of two weeks.

Deposited emulsion particles in the pores of aluminum oxide film

1978 ◽  
Vol 36 (1) ◽  
pp. 450-451
Author(s):  
Michio Ashida ◽  
Yasukiyo Ueda
Keyword(s):  
Oxide Film ◽  
Acid Solution ◽  
Barrier Layer ◽  
Colloidal Particles ◽  
Oxalic Acid Solution ◽  
Anodic Oxide ◽  
Anodic Oxide Film ◽  
Carbon Replica ◽  
Sectioning Method ◽  
Thin Sectioning

An anodic oxide film is formed on aluminum in an acidic elecrolyte during anodizing. The structure of the oxide film was observed directly by carbon replica method(l) and ultra-thin sectioning method(2). The oxide film consists of barrier layer and porous layer constructed with fine hexagonal cellular structure. The diameter of micro pores and the thickness of barrier layer depend on the applying voltage and electrolyte. Because the dimension of the pore corresponds to that of colloidal particles, many metals deposit in the pores. When the oxide film is treated as anode in emulsion of polyelectrolyte, the emulsion particles migrate onto the film and deposit on it. We investigated the behavior of the emulsion particles during electrodeposition.Aluminum foils (99.3%) were anodized in either 0.25M oxalic acid solution at 30°C or 3M sulfuric acid solution at 20°C. After washing with distilled water, the oxide films used as anode were coated with emulsion particles by applying voltage of 200V and then they were cured at 190°C for 30 minutes.

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