scholarly journals STUDY OF SORPTION OF RHENIUM IONS ON SOLID EXTRAGENTS

2021 ◽  
pp. 3-10
Keyword(s):  
Sulfuric Acid ◽  
Solid Phase ◽  
Sulfuric Acid Concentration ◽  
Sorption Process ◽  
Organic Reagent ◽  
Organic Reagents ◽  
Static Conditions ◽  
Sulfuric Acid Solutions ◽  
First Time ◽  
Kinetics Of

In this work, the aim is to study the possibility of extracting rhenium from sulfuric acid solutions by sorption of impregnated sorbents based on polystyrene-divinylbenzene (MN202) and an organic reagent MAB (2-amino-1-methylbenzimidazole).New sorbent based on MN202 (Purolite) impregnated with organic reagents have been obtained and investigated. The sorbent characteristics determined using SEM, XRD and FTIR methods. The optimal conditions for the sorption of rhenium (VII) ions for the "element-sorbent" systems have been established. Under static conditions, the sorption of rhenium on impregnated sorbents in a sulfuric acid solution was studied in the periodic system with respect to the contact time, sulfuric acid concentration, the ratio of the solid phase to liquid, and the initial concentration of rhenium. For the first time, the kinetics of sorption of rhenium (VII) ions with the obtained solid extractants has been studied. The kinetic parameters of the chemical reaction on the surface of the impregnate have been determined. Based on the processing of the integral kinetic curves of sorption, it was found that the sorption process proceeds in accordance with second-order models.

Kinetics of reduction of U(VI) with zinc amalgam in sulfuric acid solutions

2015 ◽  
Vol 57 (1) ◽  
pp. 31-35 ◽  
Author(s):  
V. N. Momotov ◽  
E. A. Erin ◽  
V. M. Chistyakov
Keyword(s):  
Sulfuric Acid ◽  
Acid Solutions ◽  
Zinc Amalgam ◽  
Sulfuric Acid Solutions ◽  
Kinetics Of ◽  
Kinetics Of Reduction

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.

scholarly journals Studying the effects of bismuth on the electrochemical properties of lead dioxide layers by using the in situ EQCM technique

2020 ◽  
Vol 24 (11-12) ◽  
pp. 2733-2739
Author(s):  
Balázs Broda ◽  
György Inzelt
Keyword(s):  
Sulfuric Acid ◽  
Quartz Crystal ◽  
Lead Dioxide ◽  
Electrochemical Quartz Crystal Microbalance ◽  
Lead Sulfate ◽  
Acid Media ◽  
Sulfuric Acid Solutions ◽  
Kinetics Of ◽  
Thick Lead

Abstract The charge-discharge characteristics and the aging mechanism of PbO2 layers doped with bismuth in contact with sulfuric acid solutions were studied by using combined cyclic voltammetry and electrochemical quartz crystal microbalance (EQCM) techniques. For this purpose, thick lead dioxide layers (non-doped and doped with Bi) were electrodeposited on gold substrate from aqueous solutions of Pb(NO3)2 dissolved in nitric acid and they were investigated in sulfuric acid media. Based on the electrochemical and the mass change responses, it is concluded that during the electrodeposition, bismuth influences the structure of the PbO2 formed. Bi(III) also inhibits the oxidation of lead sulfate and affects the reduction kinetics of lead dioxide. During successive cyclization (aging), the presence of bismuth accelerates the hydration of PbO2.

Research of the kinetics of synthesis and peculiarities of solid-phase formation of mullite

2021 ◽  
Vol 1 (7) ◽  
pp. 16-20
Author(s):  
A. M. Eminov ◽  
Z. R. Kadyrova ◽  
Azizjon A. Eminov ◽  
Afzal A. Eminov ◽  
I. R. Bayjanov
Keyword(s):  
Heat Treatment ◽  
Aluminum Oxide ◽  
Phase Formation ◽  
Firing Temperature ◽  
Solid Phase ◽  
Different Temperatures ◽  
First Time ◽  
Kinetics Of

The article presents the production of ash silica during heat treatment and the schemes of modification transformation at different temperatures. On the basis of ash silica and aluminum oxide in the alumina‒silica system, mullite 3Al2O3·2SiO2 was synthesized for the first time at a relatively low firing temperature.

Kinetics of Pressure Acid Leaching of Zinc from Zinc Silicate Ore

2011 ◽  
Vol 402 ◽  
pp. 266-271
Author(s):  
Hong Sheng Xu ◽  
Chang Wei ◽  
Cun Xiong Li ◽  
Yan Song ◽  
Zhi Gan Deng ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Acid Concentration ◽  
Sulfuric Acid Concentration ◽  
Acid Leaching ◽  
Zinc Silicate ◽  
Diffusion Control ◽  
Pressure Leaching ◽  
Zinc Extraction ◽  
Shrinking Core ◽  
Sulfuric Acid Solutions

The present work is concerned with the kinetic study of pressure leaching of zinc silicate ore in sulfuric acid solutions. The effects of leaching temperature, particle size, sulfuric acid concentration and agitation speed on the zinc extraction were evaluated. The results obtained show that the zinc extraction increases with increasing sulfuric acid concentration and leaching temperature. The leaching kinetics was analyzed by using a shrinking core model with diffusion control given by: 1-2/3x-(1-x)2/3=Kt, which represented well the experimental data. The apparent activation energy was determined to be 44.56kJ/mol at temperatures ranging between 80 and 140°C.

Kinetics of Molybdenum(VI) Oxide Dissolution in Sulfuric Acid Solutions

2004 ◽  
Vol 38 (3) ◽  
pp. 316-321 ◽  
Author(s):  
E. Yu. Nevskaya ◽  
I. G. Gorichev ◽  
A. D. Izotov ◽  
B. E. Zaitsev ◽  
K. M. Al'dieva ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Acid Solutions ◽  
Oxide Dissolution ◽  
Sulfuric Acid Solutions ◽  
Kinetics Of
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