Sulfuric Acid Leaching of Valuable Metals from Spent Petrochemical Catalyst using Hydrogen Peroxide as a Reducing Agent

In this paper, nickel-containing residue, a typical solid waste produced in the battery production process, was used to study the cavitation characteristics of ultrasonic waves in a liquid–solid reaction. The ultrasonically-enhanced leaching technology for multicomponent and complex nickel-containing residue was studied through systematic ultrasonic-conventional comparative experiments. An ultrasonic leaching kinetics model was established which provided reliable technological guidance and basic theory for the comprehensive utilization of nickel-containing residue. In the study, it was found that ultrasonically-enhanced leaching for 40 min obtained the same result as conventional leaching for 80 min, and the Ni extraction degree reached more than 95%. According to the kinetic fitting of the leaching process, it was found that the sulfuric acid leaching process belonged to the diffusion-controlled model of solid product layers under conventional and ultrasonic conditions, and the activation energy of the reaction was Ea1 = 17.74 kJ/mol and Ea2 = 5.04 kJ/mol, respectively.

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The special features of the kinetics of oxidation of divalent iron during sulfuric acid leaching of pyrrhotine with the participation of nitrous acid

Russian Journal of Physical Chemistry A ◽

10.1134/s0036024409010063 ◽

2009 ◽

Vol 83 (1) ◽

pp. 25-28 ◽

Cited By ~ 2

Author(s):

T. I. Markovich

Keyword(s):

Sulfuric Acid ◽

Nitrous Acid ◽

Acid Leaching ◽

Sulfuric Acid Leaching ◽

Kinetics Of Oxidation ◽

Divalent Iron ◽

Kinetics Of

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Removal of Fe(III) from sulfuric acid leaching solution of phosphate ores with bisphosphonic acids

Hydrometallurgy ◽

10.1016/j.hydromet.2021.105799 ◽

2021 ◽

pp. 105799

Author(s):

Chengjin Xu ◽

Ling Li ◽

Miaomiao Zhang ◽

Xiao Meng ◽

Xiujing Peng ◽

...

Keyword(s):

Sulfuric Acid ◽

Acid Leaching ◽

Sulfuric Acid Leaching ◽

Leaching Solution ◽

Bisphosphonic Acids ◽

Phosphate Ores

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Sulfuric Acid Leaching of Bangka Indonesia Ilmenite Ore and Ilmenite Decomposed by NaOH

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.789.522 ◽

2013 ◽

Vol 789 ◽

pp. 522-530 ◽

Cited By ~ 4

Author(s):

Latifa Hanum Lalasari ◽

Rudi Subagja ◽

Akhmad Herman Yuwono ◽

Florentinus Firdiyono ◽

Sri Harjanto ◽

...

Keyword(s):

Titanium Dioxide ◽

Sulfuric Acid ◽

Solvent Extraction ◽

Acid Leaching ◽

Raw Material ◽

Key Factors ◽

Sulfuric Acid Leaching ◽

Acid Environment

lmenite (FeO.TiO2) ore from Bangka island-Indonesia is a potential raw material for synthesizing titanium dioxide (TiO2), which can be used further as pigmen and photocatalyst. The fabrication of TiO2 particles from ilmenite can be carried out through the solvent extraction using sulfuric acid route. Therefore, the solubility of the ilmenite ore in sulfuric acid environment is one of the key factors to obtain the desired TiO2 particles. The current research is aimed at comparing the solubility of pristine Bangka ilmenite ore with that of precedingly decomposed by sodium hidroxide (NaOH) in pressurized and atmospheric reflux reactors. The dissolution of both precursors was carried out in those reactors under various temperatures of 75, 100, 125, 150 and 175°C. The results showed that the optimum dilution was achieved at 150°C. The obtained recovery of ilmenite was 88.8 % for the pressurized reactor and 75.5% for the atmospheric reflux reactor. The solubility of titanium (Ti) element increased steadily to reach a recovery of 68% at 150°C and decreased significantly afterwards. It was also found that the increase of iron (Fe) element solubility was proportional to the increase of processing temperatures.

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Effect of Oxidant on the Leaching Rate of Indium from Water Quenching Slag

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.591.122 ◽

2013 ◽

Vol 591 ◽

pp. 122-125

Author(s):

Li Jiao Yang ◽

Si Chen ◽

Yan Zhang ◽

Nan Chun Chen ◽

Jun Gao ◽

...

Keyword(s):

Hydrogen Peroxide ◽

Sulfuric Acid ◽

Potassium Permanganate ◽

Crystal Violet ◽

Acid Leaching ◽

Water Quenching ◽

Test Results ◽

Leaching Rate ◽

Initial Concentration ◽

Solid Ratio

Extracting indium from water quenching slag, which contains poor indium, by two process of leaching, the effect of different oxidants and dosages on the leaching rate of indium in water quenching slag were studied. The leaching conditions: temperature 80 °C, leaching time 2 h, the liquid to solid ratio of neutral leaching 8︰1, the liquid to solid ratio of acid leaching 2︰1, initial concentration of sulfuric acid 500 g·L-1, adding different oxidants, the concentration was detected by crystal violet spectrophotometry. Test results showed that the leaching rate of indium was significantly improved by adding hydrogen peroxide and potassium permanganate. Compared with the effect of different oxidants, the effect of potassium permanganate was significantly higher than that of hydrogen peroxide on the leaching rate of indium.

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