Dissolution kinetics of Zn2SiO4 powders: Effects of polymorphs, temperature, particle size, and Fe2+ presence

1994 ◽  
Vol 58 (17) ◽  
pp. 3583-3593 ◽  
Author(s):  
Lin Chung-Cherng ◽  
Shen Pouyan
Keyword(s):  
Particle Size ◽  
Dissolution Kinetics ◽  
Kinetics Of

Dissolution kinetics of colemanite in HCl solutions by measuring particle size distributions

2017 ◽  
Vol 53 (1) ◽  
pp. 198-205 ◽  
Author(s):  
Hikmet Sis ◽  
Ismail Bentli ◽  
Nizamettin Demirkiran ◽  
Ahmet Ekmekyapar
Keyword(s):  
Particle Size ◽  
Dissolution Kinetics ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Kinetics Of

The Dissolution Kinetics of Tincal in Phosphoric Acid Solutions

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Yuksel Abali ◽  
Salih U Bayca ◽  
Ayse E Guler
Keyword(s):  
Particle Size ◽  
Phosphoric Acid ◽  
Dissolution Rate ◽  
Acid Concentration ◽  
Reaction Temperature ◽  
Dissolution Kinetics ◽  
Reaction Model ◽  
Acid Solutions ◽  
Liquid Ratio ◽  
Kinetics Of

In this study, the dissolution kinetics of tincal in phosphoric acid solutions was investigated. The effects of reaction temperature, acid concentration, solid to liquid ratio, particle size and stirring speed were determined in the experiments. The results showed that the dissolution rate increased with increasing acid concentration, reaction temperature, stirring speed and increased with decreasing particle size and solid to liquid ratio. The dissolution rate was found to be based on the first order pseudo homogenous reaction model. The activation energy of the tincal in phosphoric acid solution was determined as 42.28 kJ.mol-1.

scholarly journals Dissolution of Tunisian phosphate ore by a mixture of sulfuric and phosphoric acid: Kinetics study by means of differential reaction calorimetry

2019 ◽  
Vol 55 (1) ◽  
pp. 9-19
Author(s):  
Olfa Lachkar-Zamouri ◽  
Khemaies Brahim ◽  
Faten Bennour ◽  
Ismail Khattech
Keyword(s):  
Experimental Data ◽  
Particle Size ◽  
Dissolution Rate ◽  
Dissolution Kinetics ◽  
Reaction Model ◽  
Reaction Calorimetry ◽  
Phosphate Ore ◽  
Differential Reaction ◽  
Apparent Activation Energies ◽  
Kinetics Of

A mixture of phosphoric and sulfuric acid was used to investigate the dissolution kinetics of phosphate ore by Differential Reaction Calorimetry (DRC). The effect of the solid-to-iquid ratio, concentration, stirring speed, particle size and temperature of the reaction is examined. It was established that the dissolution rate increased with stirring speed and particle size. However, rising the olid-to-iquid ratio, temperature and concentration decreased the dissolution rate. It was determined that the dissolution rate fits in the first order of the pseudo-homogeneous reaction model. Two negative values of apparent activation energies were found in the range of 25 to 60?C. The experimental data were tested by graphical and statistical methods and it was found that the following models were best fitted for the experimental data and an empirical equation for the process was developed. -ln (1 ? x) = [2,2 E-09((S/L)0.75C -0.461G0.447(SS) 0.471exp (2671/T)]t. T? 40?C -ln (1 ? x) = [2,2 E-09((S/L)0.75C -0.461G0.447(SS) 0.471exp (6959/T)]t. T > 45?C

Leaching of Niobium from Low-Grade Refractory Ore Using H2SO4 Roast System

2014 ◽  
Vol 997 ◽  
pp. 651-654 ◽  
Author(s):  
Biao Wu ◽  
He Shang ◽  
Wen Cheng Gao ◽  
Jian Kang Wen
Keyword(s):  
Particle Size ◽  
Sulfuric Acid ◽  
Weight Ratio ◽  
Dissolution Kinetics ◽  
Low Grade ◽  
Mass Ratio ◽  
Improved Method ◽  
Dilute Sulfuric Acid ◽  
Roasting Temperature ◽  
Kinetics Of

A new improved method is proposed for the leaching and extraction of niobium from a low-grade refractory niobium–tantalum ore.The ore was roasted and decomposed with concenrated H2SO4 then leached with dilute sulfuric acid. The effects of various factors, such as roasting temperature and time, acid to ore mass ratios,as well as particle size, on the dissolution kinetics of niobium were comprehensively investigated. The optimal conditions were particle size-38μm, roasting temperature 300°C,reacting time 2h and acid to ore mass ratio 1:1. The roasting residue reacted for 2 h with sulfuric acid in the ore/acid weight ratio of 3:1 at 90°C, the niobium was recoveried as high as 90.3%.

Dissolution kinetics of sub-millimeter Composition B detonation residues: Role of particle size and particle wetting

Chemosphere ◽  
2012 ◽  
Vol 88 (5) ◽  
pp. 591-597 ◽  
Author(s):  
Mark E. Fuller ◽  
Charles E. Schaefer ◽  
Christina Andaya ◽  
Volha Lazouskaya ◽  
Steve Fallis ◽  
...  
Keyword(s):  
Particle Size ◽  
Dissolution Kinetics ◽  
Kinetics Of

Dissolution kinetics of guar gum powders—III. Effect of particle size

2006 ◽  
Vol 64 (2) ◽  
pp. 239-246 ◽  
Author(s):  
Qi Wang ◽  
Peter R. Ellis ◽  
Simon B. Ross-Murphy
Keyword(s):  
Particle Size ◽  
Guar Gum ◽  
Dissolution Kinetics ◽  
Effect Of Particle Size ◽  
Kinetics Of

The dissolution kinetics of sand as function of particle size

1998 ◽  
Vol 76 (2) ◽  
pp. 233-238 ◽  
Author(s):  
Ferida Jendoubi ◽  
Arbi Mgaidi ◽  
Mohamed El Maaoui
Keyword(s):  
Particle Size ◽  
Dissolution Kinetics ◽  
Kinetics Of

Dissolution Kinetics of CaCO3in Powder Form and Influence of Particle Size and Pretreatment on the Course of Dissolution

1996 ◽  
Vol 35 (2) ◽  
pp. 465-474 ◽  
Author(s):  
Evagelos D. Economou ◽  
Nicholaos P. Evmiridis ◽  
Athanasios G. Vlessidis
Keyword(s):  
Particle Size ◽  
Dissolution Kinetics ◽  
Powder Form ◽  
Kinetics Of

scholarly journals An Analytical Model Approach for the Dissolution Kinetics of Magnesite Ore Using Ascorbic Acid as Leaching Agent

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Nadeem Raza ◽  
Zafar Iqbal Zafar ◽  
Najam-ul-Haq
Keyword(s):  
Particle Size ◽  
Ascorbic Acid ◽  
Acid Concentration ◽  
Kinetic Data ◽  
Dissolution Kinetics ◽  
Reaction Parameters ◽  
Solid Ratio ◽  
Leaching Process ◽  
Kinetics Of ◽  
Model Approach

Ascorbic acid was used as leaching agent to investigate the dissolution kinetics of natural magnesite ore. The effects of various reaction parameters such as acid concentration, liquid-solid ratio, particle size, stirring speed, and temperature were determined on dissolution kinetics of the magnesite ore. It was found that the dissolution rate increased with increase in acid concentration, liquid-solid ratio, stirring speed, and temperature and decrease in the particle size of the ore. The graphical and statistical methods were applied to analyze the kinetic data, and it was evaluated that the leaching process was controlled by the chemical reaction, that is, . The activation energy of the leaching process was found to be 57.244 kJ mol−1 over the reaction temperature range from 313 to 343 K.

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