To determine the effects of the acid/solid ratio, particle size, and sulfuric acid concentration on the Ti leaching, we established the following semi-empirical model: (14) 1 3 ln 1 − X − 1 − 1 − X 1 3 = k 1 r a d b c c e − E a RT t where X represents the Ti leaching rate, k is the kinetic constant, r is the acid/solid ratio, d is the ...

Recovery of ruthenium resources from red mud via phosphoric acid leaching: A comprehensive investigation of leaching effects and kinetics. Author links open overlay panel Yue Ma, Chao Hu, Yanru Jin, ... The reaction model of the leaching process was determined after further fitting the inner diffusion-controlled model, chemical reaction-control ...

The sulphuric acid leaching behaviour of copper oxide ore was applied in various kinetic models and interpreted graphically and assessed by the correlation coefficient (R 2) represented in Table 3. The highest value of correlation coefficient determines the fitting kinetic equation model that follows the dissolution of the element.

This study aims to develop a mathematical model that can explain the mechanism of the leaching process of laterite ore using a low concentration of the citric acid solution and evaluate that model using the experimental data.

A shrinking core model has been considered for leaching of zinc ores containing silicates with a Corresponding author: [email protected] E S Web of Conferences e sconf/2016 3, 010 ... The chemistry of serpentinite ore acid leaching process is well understood [11,12]. Partial decomposition of the silicate structure of serpentine

Atmospheric acid leaching (AL) in agitated vessels is a preferred processing method for low grade Ni laterites (Arroyo and Neudorf, 2004, Canterford, 1978, Luo et al., 2010, McDonald and Whittington, 2008, Nosrati et al., 2014, Senanayake et al., 2011, Senanayake and Das, 2004).Typical AL conditions (e.g., 1–6 h residence time and 70–95 °C) result in < 90% Ni …

model will be used for acetic acid leaching of LIBs and then evaluated for its accuracy. 2 (molMathematical Model The leaching of Co from Li-Ion battery cathode powder proceeds through reaction between Co compounds with acetic acid that is hypothesized following mechanism described in eq. (1) – (3) [14]. 32 LiCoO Li + Co 2O)( 2 () ()s aq aq aq

A component-based leach model for describing leaching of hazardous contaminants that are immobilized by pH-dependent reactions is presented, and applications …

The preliminary leaching studies indicated that HNO3 acid yielded the best recoveries for nickel under the same leaching conditions as HCl and H2SO4, however, H2SO4 was selected considering industrial and economic potential. ... Shrinking core model with variable activation energy: a kinetic model of manganiferous ore leaching with sulphuric ...

This study aims to develop a mathematical model that can explain the mechanism of the leaching process of laterite ore using a (PDF) Kinetic Study of Organic Acid Leaching in Laterite Ore Academia.edu no longer supports Internet Explorer.

Over the past few decades, research on the acid leaching of uranium has highlighted the migration and oxidation of uranium, along with the environmental implications of uranium transport (Morrison et al., ... (2014) constructed a reactive transport model to assess the impact of ore mineralogical composition on secondary minerals in AISL mining ...

Studying kinetic behavior or model is important for designing or broadening the leaching process, since it describes the dissolution rates of phosphorous, calcium, iron, lanthanum, and cerium using solutions of hydrochloric (HCl) and phosphoric acids (H 2 PO 3) as leaching agents.

A key direction for improving the hydrofluoric acid method is optimizing the leaching agent system. It has been reported that HCl, HF, H 2 SO 4, and HNO 3, or a mixture of these, can be used to produce high-purity graphite after flotation, which can increase the fixed carbon content of aphanitic graphite to over 99 % (Kaya and Canbazoğlu, 2009, Wang et al., 2016).

In this work, isothermal, atmospheric acid leaching mechanism and kinetics of Ni/Co and gangue mineral elements from a Western Australian saprolitic ore, as well as the …

We set up a model system to study the effect of parameters such as pH, microorganisms, microbial metabolites, and organic ligands on covellite leaching to get a better understanding of the processes in copper leaching at pH ≥ 6. With this model system we could show that glutamic acid and the microbial siderophore desferrioxamine B promote ...

The aim of this study is to design and develop an efficient leaching process based on a fundamental and theoretical thermodynamic analysis and the optimization of the operation parameters via the response surface methodology (RSM). Using this methodology, the design of a leaching process for the recovery of copper, silver, and lead from highly metal-concentrated …

The leaching behavior of nickel and iron in limonite-type laterite nickel ore was studied through ammonium hydrogen sulfate atmospheric leaching. The leaching temperature, ammonium bisulfate concentration, reaction time, and acid excess rate during the nickel dissolution process were optimized using the response surface methodology (RSM) …

Incinerated sewage sludge ash contains significant amounts of phosphorus. This research optimized the phosphorus extraction process using ultrasonic and leaching processes and determined the most suitable process conditions by the Response Surface Methodology (RSM). This was done by evaluating the effect of different parameters such as the lemon juice …

The results indicated that the copper leaching kinetic conforms to the shrinking core model, and the overall leaching reaction was controlled by the internal diffusion control with an activation energy of 11.22 KJ/mol. ... rapid reaction rates, and environmentally friendly characteristics. Acid leaching process was divided into high-pressure ...

confirmed that the proposed models can be useful tools in predicting the leaching process behaviour and outputs. Keywords: coal fly ash, Eureqa Newtonian software, leaching model, pressure acid-leaching. Received 06 May 2022 Accepted 06 August 2022 Journal of Chemical Technology and Metallurgy, 58, 1, 2023, 187-199

Acid leaching for different types of mixed spent Li-ion mobile batteries is carried out after alkali decomposition using NH 4 OH followed by H 2 SO 4 + H 2 O 2 leaching. In the alkali decomposition step, the effects of reaction time, NH 4 OH concentration, liquid/solid mass ratio and reaction temperature on the decomposition process are investigated to remove Al, Cu, Mn, …

The experimental data was analyzed using relevant kinetic models to establish the best model of fit. Alumina leaching rate increased as the temperature, stirring rate, and acid concentration increased, and decreased with increase in solid/liquid ratio and particle diameter. ... The recovery of aluminium from Owhe kaolinite via hydrochloric acid ...

Studying kinetic behavior or model is important for designing or broadening the leaching process, since it describes the dissolution rates of phosphorous, calcium, iron, lanthanum, and cerium using solutions of …

The first stage of the acid leaching allows the leaching of La, Pr, Nd and Ca, which prevents the formation of CaSO 4 as undesirable product layer in the second stage of Ce leaching. Therefore, the diffusion of sulfuric acid was kinetically fast in the second stage. ... The utilization of the kinetics models for the leaching of REEs was deeply ...

cess of the tank leaching can be protable and justiable. The present study aims to evaluate the feasibility of dis-solving the low-grade copper oxide deposit, rejected of the jaw crusher, in sulfuric acid solutions and develop a kinetic model that can describe the leaching reaction and provide the most important kinetics parameters of the process.

Focusing on hydrometallurgy, acids have proven to be effective with LIB metal recoveries of over 90% being achieved [24], [25].Inorganic acids such as sulfuric acid (H 2 SO 4) and hydrochloric acid (HCl) have been chiefly used to accomplish metal dissolution during leaching [26], [27], [28], [29].While effective, the strong inorganic acids result in toxic gas …

A first-order kinetic model is developed by considering the clay to consist of two types of aluminium sites - one that is activated and another that is refractory. The proportion of sites of …

Furthermore, the results of the Everbatt model analysis show that the air roasting-H2SO4 leaching method has low emission and potentially high income, which is simple and safe. Overall, this work will deepen the understanding of acid leaching of LFP and favorably stimulate the maturation of the LFP recycling technique.

In molybdenum hydrometallurgy technology, the acid leaching process is widely used because of its advantages: short process, low reagent consumption, high metal recovery rate, and low pollution [7].Sulfuric acid is prevalently utilized for the leaching of valuable metals in secondary resources such as dust and waste catalysts.