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.

Sulfuric Acid Leaching on Low Grade Oxide Ore

2013 ◽  
Vol 826 ◽  
pp. 122-125 ◽  
Author(s):  
Jin Lin Yang ◽  
Hong Mei Zhang ◽  
Gui Fang Wang ◽  
Shao Jian Ma ◽  
Min Zhang
Keyword(s):  
Sulfuric Acid ◽  
Sulfuric Acid Concentration ◽  
Acid Leaching ◽  
Strong Acid ◽  
Metal Extraction ◽  
Low Grade ◽  
Leaching Rate ◽  
Sulfuric Acid Leaching ◽  
Solid Ratio ◽  
Iron Leaching

In this paper, sulfuric acid leaching was carried out to assess the effect of several parameters on metal extraction in a low grade complex gossan ore in which the grade of zinc and iron is 13% and 40.2%, respectively. Parameters, such as sulfuric acid concentration, liquid to solid ratio and leaching temperature, were studied. The results show that the zinc leaching rate is almost 80%, while the iron leaching rate is about 45% used strong acid with 200g/L. It can be seen from the results that sulfuric acid leaching could not effectively recover zinc from gossan ores studied in this paper because of iron dissolving greatly.

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

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.

Effect of mechanical activation on the kinetics of sulfuric acid leaching of beach sand ilmenite from Orissa, India

2004 ◽  
Vol 75 (1-4) ◽  
pp. 189-204 ◽  
Author(s):  
C. Sasikumar ◽  
D.S. Rao ◽  
S. Srikanth ◽  
B. Ravikumar ◽  
N.K. Mukhopadhyay ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Mechanical Activation ◽  
Acid Leaching ◽  
Beach Sand ◽  
Sulfuric Acid Leaching ◽  
Kinetics Of

Kinetics of sulfuric acid leaching of cadmium from Cd–Ni zinc plant residues

2009 ◽  
Vol 163 (2-3) ◽  
pp. 880-890 ◽  
Author(s):  
Mohammad Sadegh Safarzadeh ◽  
Davood Moradkhani ◽  
Mehdi Ojaghi-Ilkhchi
Keyword(s):  
Sulfuric Acid ◽  
Acid Leaching ◽  
Plant Residues ◽  
Sulfuric Acid Leaching ◽  
Zinc Plant ◽  
Kinetics Of
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