Leaching Kinetics of Vanadium and Chromium During Sulfuric Acid Leaching With Microwave and Conventional Calcification-Roasted High Chromium Vanadium Slag

2018 ◽  
Vol 41 (1) ◽  
pp. 22-31 ◽  
Author(s):  
Huiyang Gao ◽  
Tao Jiang ◽  
Yingzhe Xu ◽  
Jing Wen ◽  
Xiangxin Xue
Keyword(s):  
Sulfuric Acid ◽  
Acid Leaching ◽  
Leaching Kinetics ◽  
Vanadium Slag ◽  
Sulfuric Acid Leaching ◽  
High Chromium ◽  
Kinetics Of

Microwave Roasting and Acid Leaching of Vanadium and Chromium from High Chromium Vanadium Slag with CaCO3

2019 ◽  
Vol 294 ◽  
pp. 86-91
Author(s):  
Hui Yang Gao ◽  
Tao Jiang ◽  
Ying Zhe Xu
Keyword(s):  
Sulfuric Acid ◽  
Acid Leaching ◽  
Vanadium Slag ◽  
Sulfuric Acid Leaching ◽  
High Chromium ◽  
Microwave Roasting ◽  
Roasting Process ◽  
Roasting Temperature ◽  
Irradiation Technology ◽  
Roasting Time

In this study, microwave irradiation technology was used for the calcification roasting followed by sulfuric acid leaching process. The effect of roasting temperature, m (CaO)/m (V2O5), and roasting time on the leaching ratio of vanadium were investigated and the roasted samples were characterized by TG-DSC, XRD, and SEM. The leaching ratio of vanadium can be significantly enhanced with the increasing in roasting temperature, m (CaO)/m (V2O5), and roasting time. The leaching ratio of chromium decreased with roasting temperature and increased with m (CaO)/m (V2O5), and roasting time. The optimal roasting parameters were roasting temperature of 850 °C, the m (CaO)/m (V2O5) of 0.85, and roasting time of 90 min. Under the optimal roasting parameters, the leaching ratio of vanadium reached 88.81%. While the leaching ratio of chromium is 3.98%. During roasting process, vanadium is oxidized to acid-soluble CaV2O5, Ca2V2O7, and CaMgV2O7. After leaching, chromium mainly exists in form of chromohercynite (FeCr2O4) and chrome-manganese spinel (Mn1.5Cr1.5O4) in leaching residues.

Sulfuric acid leaching kinetics of South African chromite

2015 ◽  
Vol 22 (3) ◽  
pp. 233-240 ◽  
Author(s):  
Qing Zhao ◽  
Cheng-jun Liu ◽  
Pei-yang Shi ◽  
Bo Zhang ◽  
Mao-fa Jiang ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
South African ◽  
Acid Leaching ◽  
Leaching Kinetics ◽  
Sulfuric Acid Leaching ◽  
Kinetics Of

Leaching kinetics of calcification roasted vanadium slag with high CaO content by sulfuric acid

2014 ◽  
Vol 133 ◽  
pp. 105-111 ◽  
Author(s):  
Zhao Yang ◽  
Hong-Yi Li ◽  
Xu-Chen Yin ◽  
Zhi-Ming Yan ◽  
Xiao-Man Yan ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Leaching Kinetics ◽  
Vanadium Slag ◽  
Kinetics Of

scholarly journals Sulfuric Acid Leaching of Altered Ilmenite Using Thermal, Mechanical and Chemical Activation

Minerals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 538
Author(s):  
Anastasiia V. Dubenko ◽  
Mykola V. Nikolenko ◽  
Andrii Kostyniuk ◽  
Blaž Likozar
Keyword(s):  
Sulfuric Acid ◽  
Chemical Activation ◽  
Acid Leaching ◽  
Process Intensification ◽  
Raw Material ◽  
Sharp Constant ◽  
Sulfuric Acid Leaching ◽  
H2so4 Concentration ◽  
First Time ◽  
Kinetics Of

The kinetics of the sulfuric acid leaching of altered ilmenite, mechanisms, and process intensification methods were studied. The effect of changing the chemical composition during grinding was determined. The content of ilmenite and pseudorutile decreased from 5.3% to 3.1% and from 90.2% to 63.1%, respectively. Rutile increased from 4.5% to 28.7%, while a pseudobrookite new phase appeared in the amount of 5.1% after 2 h of grinding. It was found that the modification of raw material by sulfuric acid led to the increase of the decomposition rate, and at the same time, decreased when the ore was utilized due to an increase of insoluble TiO2 content. Isothermal conditions were evaluated with H2SO4 concentration varying from 50 to 96%. The data obtained were described with the approximation of the contracting sphere model. It was shown for the first time that H2SO4 > 85 wt% causes a sharp constant decrease of titanium. Correlating these phenomena allows for the consideration of H2SO4·H2O as reagents, rather than H2SO4 molecules. It was experimentally proven that at a temperature above 190 °C, the Ti leaching degree dropped, which is explained by the formation of polymerized TiOSO4. Finally, it was shown that adding NaF reduced the activation energy to 45 kJ/mol.

scholarly journals KINETIC REGULARITIES OF NICKEL SULFURIC ACID LEACHING PROCESSES

2021 ◽  
pp. 73-78
Author(s):  
Анна Игоревна Пичугина ◽  
Дарья Дмитриевна Гончар
Keyword(s):  
Sulfuric Acid ◽  
Acid Leaching ◽  
Rotation Frequency ◽  
Metal Extraction ◽  
Sulfuric Acid Leaching ◽  
Disk Rotation ◽  
Natural Minerals ◽  
Composition And Structure ◽  
Polynomial Models ◽  
Kinetics Of

В работе представлены результаты исследования кинетики сернокислого выщелачивания никеля из его сульфидов. В качестве модельных образцов выбраны синтезированные сульфиды никеля по составу и строению идентичные природным минералам: миллериту и хизлевудиту. Получены зависимости влияния скорости извлечения металла от концентрации серной кислоты, температуры, частоты вращения диска и продолжительности взаимодействия. Рассчитаны полиномиальные модели изучаемого процесса, преобразованные в уравнения скорости. Вычислены константы скорости и эмпирические значения энергии активации. The paper presents the results of a study of the kinetics of sulfuric acid leaching of nickel from its sulfides. Synthesized nickel sulfides were selected as model samples, identical in composition and structure to natural minerals: millerite and heazlewudite. The dependences of the influence of the metal extraction rate on the concentration of sulfuric acid, temperature, disk rotation frequency and duration of interaction are obtained. The polynomial models of the process under study, transformed into velocity equations, are calculated. The rate constants and empirical values of the activation energy are calculated.

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