Preliminary Study on the Reductive Leaching of Manganese Ores using FeSO₄/Iron Powder as Reducing Agents under Room Temperature

2021 ◽  
Vol 6 (6) ◽  
pp. 14-18
Author(s):  
Kofi Moro ◽  
Frank Haubrich ◽  
Mirko Martin
Keyword(s):  
Particle Size ◽  
Iron Powder ◽  
Acid Concentration ◽  
Room Temperature ◽  
Reducing Power ◽  
Manganese Ore ◽  
Mass Ratio ◽  
Liquid Ratio ◽  
Leaching Parameters ◽  
Solid Liquid

The leaching of manganese (Mn) ore in sulphuric acid (H2SO4) under reductive conditions has been studied. The effects of leaching parameters such as ore/reductant mass ratio, acid concentration, ore particle size, solid/liquid ratio, leaching time and different reductant potential on the maximum recovery of manganese have been investigated. The optimal leaching conditions were ore/reductant mass ratio of 1:3.4, acid concentration of 10% v/v H2SO4, ore particle size of 63-200 µm, particle size of iron powder of –150 µm, solid/liquid ratio of 1:20, and leaching time of 1.5 hours at room temperature. A comparative analysis on the recovery of manganese ore was also investigated under the optimal leaching conditions for two different reductants, iron sulphate (FeSO4) and iron powder. The maximum manganese recoveries at the optimal leaching conditions in the presence of FeSO4 and iron powder are 80.6% and 95%, respectively. The results indicate that manganese can readily be leached during short time at room temperature. Furthermore, iron powder has a stronger reducing power compared to FeSO4 with respect to manganese ore recovery.

scholarly journals Initial Investigation into the Leaching of Manganese from Nodules at Room Temperature with the Use of Sulfuric Acid and the Addition of Foundry Slag—Part I

Minerals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 565 ◽  
Author(s):  
Norman Toro ◽  
Nelson Herrera ◽  
Jonathan Castillo ◽  
Cynthia Torres ◽  
Rossana Sepúlveda
Keyword(s):  
Particle Size ◽  
Sulfuric Acid ◽  
Acid Concentration ◽  
Room Temperature ◽  
Sulfuric Acid Concentration ◽  
Extraction Rate ◽  
Molar Ratio ◽  
Independent Variables ◽  
Initial Investigation ◽  
Optimization Methodology

In this study, the surface optimization methodology was used to assess the effect of three independent variables—time, particle size and sulfuric acid concentration—on Mn extraction from marine nodules during leaching with H2SO4 in the presence of foundry slag. The effect of the MnO2/Fe ratio and particle size (MnO2) was also investigated. The maximum Mn extraction rate was obtained when a MnO2 to Fe molar ratio of 0.5, 1 M of H2SO4, −320 + 400 Tyler mesh (−47 + 38 μm) nodule particle size and a leaching time of 30 min were used.

Effect of Core/Shell Ratio on Performance of Paraffin/Polyurea Phase Change Microencapsules

2014 ◽  
Vol 556-562 ◽  
pp. 32-35 ◽  
Author(s):  
Wu Sheng Luo ◽  
Sheng Fei Yu ◽  
Jie Min Zhou
Keyword(s):  
Particle Size ◽  
Phase Change ◽  
Interfacial Polymerization ◽  
Average Particle Size ◽  
Energy Performance ◽  
Toluene Diisocyanate ◽  
Core Shell ◽  
Average Particle ◽  
Mass Ratio ◽  
Solid Liquid

In this paper, paraffin/polyurea (PU) phase change microencapsules were prepared through an interfacial polymerization method using composite paraffin with solid/liquid mass ratio 3:7 as core materials, 2,4 toluene diisocyanate (TDI) and ethylenediamine (EDA) as monomers, NP-10 as an emulsifier. It was explored the effect of the monomer mass ratio mEDA: mTDIon the yield of hollow PU microcapsules, and the effect of core/shell ratio on the particle size and coating efficiency and storage-energy performance of paraffin/PU phase change microencapsules. The experimental results showed the PU yield is increasing with the increasing of EDA:TDI mass ratio until 0.5:1,then keeps the constant. Paraffin/PU phase change microencapsules prepared with the core-shell ratio of 2:1 have better performance: the melting point of 28.1°C, the enthalpy of 58.4KJ/Kg, encapsulation efficiency of 87.5%, the average particle size of 4.32μm, and the uniform particle size distribution.

Protein Extraction of the Long-Term Room Temperature Storage Wheat Straw

2013 ◽  
Vol 690-693 ◽  
pp. 1252-1255 ◽  
Author(s):  
Tao Zhang ◽  
Lian Jie Wang ◽  
Hui Chen
Keyword(s):  
Wheat Straw ◽  
Room Temperature ◽  
Protein Extraction ◽  
Extraction Yield ◽  
Extraction Temperature ◽  
Liquid Ratio ◽  
Room Temperature Storage ◽  
Solid Liquid ◽  
Temperature Storage

Study on extract protein from long-term room temperature storage of wheat straw,utilize L9(34) Orthogonal experiment on the basis of single factor test.Study the impact of extraction time,extraction temperature and solid-liquid ratio on protein extraction yield of wheat straw.Result show factors affect wheat straw protein extraction rate in the order of extraction time>extraction temperature>liquid ratio>blank test,the optimal conditions is 50°C, the solid-liquid ratio 1:20 extract for 12 hours.Measured extraction yield is 21.761%.

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.

Optimization of Nickel Chemical Extraction from Hazardous Residue

2016 ◽  
Vol 14 (1) ◽  
pp. 175-183 ◽  
Author(s):  
Mahdi Gharabaghi ◽  
Amirreza Azadmehr
Keyword(s):  
Reaction Time ◽  
Acid Concentration ◽  
Acid Leaching ◽  
Quadratic Model ◽  
Chemical Extraction ◽  
Liquid Ratio ◽  
Nickel Extraction ◽  
Process Factors ◽  
Solid Liquid ◽  
Significant Factors

AbstractStatistical design of experiments was used for design and analysis of nickel extraction from hazardous waste. Sulphuric acid leaching of zinc plant residue has been performed for monitoring and evaluating the effects of process factors on the nickel leaching yield. Factorial design was planned first in order to study the effect of six process factors and screen main variables. These factors were reaction time, acid concentration, solid-liquid ratio % (w/v), particle size, stirring speed and reaction temperature. The main factors and their interaction were studied by analysis of variance (ANOVA), and the results showed that the reaction time, acid concentration and solid-liquid ratio were the most significant factors. In the second set of experiments, response surface methodology (RSM) was used for modelling and optimisation of significant factors. Quadratic model was derived for the prediction of nickel extraction. The optimum values for maximum nickel was identified to be a leaching time of 30 min, acid concentration 10% (V/V) and solid liquid ratio of 10%. Using these optimum conditions, more than 94% nickel was extracted. In addition the results of model equation showed a good agreement with the experimental data.

scholarly journals Process optimization of nickel extraction from hazardous waste

2012 ◽  
Vol 38 (3) ◽  
pp. 29-40
Author(s):  
Mahdi Gharabaghi ◽  
Mehdi Irannajad ◽  
Amir Reza Azadmehr ◽  
Majid Ejtemaei
Keyword(s):  
Hazardous Waste ◽  
Acid Concentration ◽  
Plant Residue ◽  
Liquid Ratio ◽  
Nickel Extraction ◽  
Zinc Plant ◽  
Valuable Metals ◽  
Solid Liquid ◽  
Main Effects ◽  
The Relationship

Abstract Zinc plant residue is a hazardous waste which contains high quantity of nickel and other valuable metals. Process parameters such as reaction time, acid concentration, solid-liquid ratio, particle size, stirring speed and temperature for nickel extraction from this waste were optimized using factorial design. Main effects and their interactions were obtained by the analysis of variance ANOVA. Empirical regression model was obtained and used to predict nickel extraction with satisfactory results and to describe the relationship between the predicted results and the experiment results. The important parameters for maximizing nickel extraction were identifi ed to be a leaching time solid-liquid ratio and acid concentration. It was found that above 90% of nickel could be extracted in optimum conditions.

Kinetics of green solid-liquid extraction of andrographolide from Andrographis paniculata: effects of particle size and solid-liquid ratio

2015 ◽  
Vol 4 (5) ◽  
Author(s):  
Umar Isah Abubakar ◽  
Lee Suan Chua ◽  
Ramlan Aziz
Keyword(s):  
Particle Size ◽  
Liquid Extraction ◽  
Andrographis Paniculata ◽  
Liquid Ratio ◽  
Solid Liquid Extraction ◽  
Solid Liquid ◽  
Kinetics Of

AbstractIn this work, the influences of particle size and solid-liquid ratio on the kinetics of green solid-liquid extraction of andrographolide from

Kinetics of leaching: a review

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Fariborz Faraji ◽  
Amirhossein Alizadeh ◽  
Fereshteh Rashchi ◽  
Navid Mostoufi
Keyword(s):  
Particle Size ◽  
Liquid Ratio ◽  
Great Role ◽  
Rate Of Dissolution ◽  
Controlling Mechanism ◽  
Wide Particle Size Distribution ◽  
Conventional Models ◽  
Leaching Parameters ◽  
Kinetics Of ◽  
Fundamental Requirement

AbstractKinetics, as a fundamental requirement of nearly all industrial activities and engineering researches, plays a great role in leaching processes. Although there are many pieces of research on its application, there is not a clear pathway for investigating the kinetics of leaching and researchers usually follow different strategies in their studies. The conventional investigation techniques, which usually do not consider the mixed mechanisms and possibility of any change in the mechanism, normally include many calculations, plots, and inadequate capabilities to detect changes in the controlling mechanism of leaching. In this review, the main mathematical models of leaching and all possible scenarios are presented and discussed. The effect of various leaching parameters (including leaching agent, temperature, particle size, agitation, and solid to liquid ratio) on the rate of dissolution is summarized. Besides, two main approaches of rate determination step (single controlling mechanism and combined resistances method) are described and compared by reporting related equations and suitable examples. A technique to detect any changes in the leaching controlling mechanism is introduced and the alternatives to confirm the results are described. Additional models and equations were suggested for the cases that there is no agreement between data and the conventional models. Also, situations which are ignored in simple models (e.g., reversibility of the leaching reactions, adsorption and desorption of leached species, influence of charge and surface potential, existence of multiple reactants in the solid, galvanic effect, wide particle size distribution, etc.) to develop more legalistic models are discussed. Considering various possible mechanisms in the kinetics of leaching, equations are derived for industrial leaching reactors.

scholarly journals Study on the adsorption of fluoride ion onto Vietnamese red mud activated with sulfuric acid

1970 ◽  
Author(s):  
Xuan Minh Vu ◽  
Tan Dung Nguyen ◽  
Vu Giang Nguyen ◽  
Cong Trinh Bui ◽  
Thi Mai Huong Le
Keyword(s):  
Red Mud ◽  
Industrial Wastewater ◽  
Room Temperature ◽  
Order Equation ◽  
Fluoride Ion ◽  
Maximum Adsorption Capacity ◽  
Liquid Ratio ◽  
Fluoride Ions ◽  
Solid Liquid

The work is devoted to the study of adsorption of F- ions on red mud, which is a waste of Vietnam's alumina plant. The red mud was previously activated with a solution of H2SO4 (2M) with a solid / liquid ratio of 1: 2. Investigation of adsorption at pH = 6.8; room temperature and adsorption time of 120 minutes showed that the maximum adsorption capacity of F- ions reached 9.4 mg / g. The kinetic regularities of the process are described by a second-order equation, the isotherm of the adsorption of F- ions is characterized by the equations of Langmuir and Freundlich. The test of the activated red mud  on real samples of wastewater containing fluoride ions showed that the quality of the water after treatment satisfies the permissible standard of Vietnam for industrial wastewater.

scholarly journals Optimization of Nitric Acid Leaching of Rare Earth Elements From Moroccan Natural Phosphate

2020 ◽  
Vol 13 (1) ◽  
pp. 1
Author(s):  
Marouane Amine ◽  
Fatima Asafar ◽  
Latifa Bilali ◽  
Mehdi Nadifiyine
Keyword(s):  
Rare Earth ◽  
Nitric Acid ◽  
Rare Earth Elements ◽  
Acid Concentration ◽  
Acid Leaching ◽  
Optimal Conditions ◽  
Liquid Ratio ◽  
Experimental Conditions ◽  
Nitric Acid Leaching ◽  
Solid Liquid

Phosphate is a very important natural resource in Morocco and one of the secondary resources of rare earth elements. Our study is particularly interested in Youssoufia phosphate, which contains 228.77 ppm of rare earth elements (ΣREEs). The purpose of our work is to study the influence of different parameters (acid concentration, solid/liquid ratio and temperature) in order to determine the optimal conditions for the leaching of rare earths. An experimental design (Doehlert matrix) has been drawn up to optimize the experimental conditions of the leaching. All tests were made with nitric acid at different concentrations varying between 1.5M and 4.5M with a solid/liquid ratio of 1/12 to 1/6; reaction temperature and duration are respectively 20°C to 80 °C and 60 min. The optimal conditions are obtained when using 69 °C as temperature, 4.1 M as acid concentration and 1/9 as solid/liquid ratio.

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