Dissolution kinetics of marmatite in sulfuric acid-ferric sulfate‑sodium chloride‑oxygen media at atmospheric pressure

2022 ◽  
Vol 208 ◽  
pp. 105801
Author(s):  
Rafael Padilla ◽  
Milton E. Copa ◽  
Maria C. Ruiz
Keyword(s):  
Sulfuric Acid ◽  
Sodium Chloride ◽  
Atmospheric Pressure ◽  
Dissolution Kinetics ◽  
Ferric Sulfate ◽  
Kinetics Of

The kinetics of vanadium extraction from spent hydroprocessing catalyst by leaching with sulfuric acid at atmospheric pressure

2019 ◽  
Vol 116 (2) ◽  
pp. 214
Author(s):  
Hongjun Wang ◽  
Yali Feng ◽  
Haoran Li ◽  
Xiangyi Deng ◽  
Jinxing Kang
Keyword(s):  
Sulfuric Acid ◽  
Acid Concentration ◽  
Reaction Temperature ◽  
Atmospheric Pressure ◽  
Sulfuric Acid Concentration ◽  
Dissolution Kinetics ◽  
Membrane Diffusion ◽  
Shrinking Core ◽  
Dissolution Ratio ◽  
Kinetics Of

The dissolution kinetics of vanadium from spent hydroprocessing catalyst was investigated by leaching with sulfuric acid at atmospheric pressure. The effects of stirring speed (400–800 rpm), initial sulfuric acid concentration (0.60–1.20 mol/l) and reaction temperature (373–423 K) on the vanadium dissolution were studied. The results showed that the vanadium dissolution ratio was practically independent of stirring speed at the investigated range, while increasing with the increases of sulfuric acid concentration and reaction temperature. The experimental data agreed quite well with the shrinking core model, with solid membrane diffusion as the rate controlling step. The apparent activation energy was calculated as 11.44 kJ/mol, and the reaction order with respect to sulfuric acid concentrations was determined to be 1.51. The kinetics equation of the leaching process was established as: 1 − 2x/3 − (1 − x)2/3 = 0.067[H2SO4]1.51exp[ − 11563/RT ]t.

scholarly journals Sustainable Hydrometallurgical Recovery of Valuable Elements from Spent Nickel–Metal Hydride HEV Batteries

Metals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1062 ◽  
Author(s):  
Kivanc Korkmaz ◽  
Mahmood Alemrajabi ◽  
Åke Rasmuson ◽  
Kerstin Forsberg
Keyword(s):  
Sulfuric Acid ◽  
Hydrochloric Acid ◽  
Hybrid Electric Vehicle ◽  
Active Material ◽  
Sulfuric Acid Concentration ◽  
Dissolution Kinetics ◽  
Leach Solution ◽  
Nickel Metal ◽  
Acid Leach ◽  
Kinetics Of

In the present study, the recovery of valuable metals from a Panasonic Prismatic Module 6.5 Ah NiMH 7.2 V plastic casing hybrid electric vehicle (HEV) battery has been investigated, processing the anode and cathode electrodes separately. The study focuses on the recovery of the most valuable compounds, i.e., nickel, cobalt and rare earth elements (REE). Most of the REE (La, Ce, Nd, Pr and Y) were found in the anode active material (33% by mass), whereas only a small amount of Y was found in the cathode material. The electrodes were leached in sulfuric acid and in hydrochloric acid, respectively, under different conditions. The results indicated that the dissolution kinetics of nickel could be slow as a result of slow dissolution kinetics of nickel oxide. At leaching in sulfuric acid, light rare earths were found to reprecipitate increasingly with increasing temperature and sulfuric acid concentration. Following the leaching, the separation of REE from the sulfuric acid leach liquor by precipitation as NaREE (SO4)2·H2O and from the hydrochloric acid leach solution as REE2(C2O4)3·xH2O were investigated. By adding sodium ions, the REE could be precipitated as NaREE (SO4)2·H2O with little loss of Co and Ni. By using a stoichiometric oxalic acid excess of 300%, the REE could be precipitated as oxalates while avoiding nickel and cobalt co-precipitation. By using nanofiltration it was possible to recover hydrochloric acid after leaching the anode material.

WITHDRAWN: Investigation of the dissolution kinetics of meta-kaolin in sulfuric acid

2010 ◽  
Author(s):  
Mehmet Rıza Altıokka ◽  
Handan Akalın ◽  
Nergis Melek ◽  
Sema Akyalçın
Keyword(s):  
Sulfuric Acid ◽  
Dissolution Kinetics ◽  
Kinetics Of

Dissolution kinetics of calcium vanadates in sulfuric acid: a fundamental study for the vanadium extraction process

2020 ◽  
Vol 95 (6) ◽  
pp. 1773-1780
Author(s):  
Qingyun Huang ◽  
Junyi Xiang ◽  
Xin Wang ◽  
Guishang Pei ◽  
Xuewei Lv
Keyword(s):  
Sulfuric Acid ◽  
Dissolution Kinetics ◽  
Extraction Process ◽  
Fundamental Study ◽  
Vanadium Extraction ◽  
Kinetics Of

scholarly journals Hydrometallurgical Recovery of Cu and Zn from a Complex Sulfide Mineral by Fe3+/H2SO4 Leaching in the Presence of Carbon-Based Materials

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 286
Author(s):  
María Luisa Álvarez ◽  
José Manuel Fidalgo ◽  
Gabriel Gascó ◽  
Ana Méndez
Keyword(s):  
Sulfuric Acid ◽  
Iberian Pyrite Belt ◽  
Sulfide Mineral ◽  
Ferric Sulfate ◽  
Copper Extraction ◽  
Copper And Zinc ◽  
Complex Sulfide ◽  
Pyrolysis Of Biomass ◽  
Kinetics Of ◽  
Carbon Based

Chalcopyrite, the main ore of copper, is refractory in sulfuric media with slow dissolution. The most commonly employed hydrometallurgical process for the oxidation of chalcopyrite and copper extraction is the sulfuric acid ferric sulfate system The main objective of the present work is to study the use of cheap carbon-based materials in the leaching of copper and zinc from a sulfide complex mineral from Iberian Pyrite Belt (IPB). The addition effect of commercial charcoal (VC) and two magnetic biochars (BM and HM) that were obtained by pyrolysis of biomass wastes was compared to that of commercial activated carbon (AC). The experimental results performed in this work have shown that the presence of carbon-based materials significantly influences the kinetics of chalcopyrite leaching in the sulfuric acid ferric sulfate media at 90 °C. The amount of copper and zinc extracted from IPB without the addition of carbon-based material was 63 and 72%, respectively. The highest amount of extracted zinc (>90%) was obtained with the addition of VC and AC in IPB/carbon-based material ratio of 1/0.25 w/w. Moreover, it is possible to recover more than 80% of copper with the addition of VC in a ratio 1/0.25 w/w. Moreover, an optimization of the properties of the carbon-based material for its potential application as catalyst in the leaching of metals from sulfide is necessary.

scholarly journals Kinetic Model for Dissolution of Cement Copper in Sulfuric Acid Solutions Containing Cupric Ions

2021 ◽  
Vol 15 (3) ◽  
pp. 395-402
Author(s):  
Nizamettin Demirkıran ◽  
◽  
G. Deniz Turhan Özdemir ◽  
Keyword(s):  
Sulfuric Acid ◽  
Dissolution Rate ◽  
Copper Powder ◽  
Dissolution Kinetics ◽  
Reaction Model ◽  
Ion Concentration ◽  
Acid Solutions ◽  
Cupric Ion ◽  
Sulfuric Acid Solutions ◽  
Kinetics Of

In this paper, the dissolution kinetics of cement copper powder in sulfuric acid solutions containing cupric ions was examined. It was observed that the dissolution rate of copper increased with increasing the acid concentration, temperature, and stirring speed. It was determined that the dissolution rate of copper enhanced with increasing the cupric ion concentration up to 0.025 M. It was found that the temperature and concentration of cupric ion had more considerable effects on the dissolution of copper powder. The kinetic analysis of the process was performed, and it was observed that it fits the first order pseudo-homogenous reaction model. The activation energy was calculated to be 31.1 kJ/mol.

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