Enhancing Cu-Zn-Cr-Ni Co-Extraction from Electroplating Sludge in Acid Leaching Process by Optimizing Fe3+ Addition and Redox Potential

2019 ◽  
Vol 36 (9) ◽  
pp. 1244-1257 ◽  
Author(s):  
Ping Wu ◽  
Lijuan Zhang ◽  
Yongdi Liu ◽  
Xinxin Xie ◽  
Jun Zhou ◽  
...  
Keyword(s):  
Redox Potential ◽  
Acid Leaching ◽  
Leaching Process ◽  
Electroplating Sludge

scholarly journals Study on Ultrasonically-Enhanced Sulfuric Acid Leaching of Nickel from Nickel-Containing Residue

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 810
Author(s):  
Zhanyong Guo ◽  
Ping Guo ◽  
Guang Su ◽  
Fachuang Li
Keyword(s):  
Sulfuric Acid ◽  
Acid Leaching ◽  
Ultrasonic Waves ◽  
Sulfuric Acid Leaching ◽  
Solid Product ◽  
Leaching Process ◽  
Diffusion Controlled ◽  
Extraction Degree ◽  
Ultrasonic Conditions ◽  
Complex Nickel

In this paper, nickel-containing residue, a typical solid waste produced in the battery production process, was used to study the cavitation characteristics of ultrasonic waves in a liquid–solid reaction. The ultrasonically-enhanced leaching technology for multicomponent and complex nickel-containing residue was studied through systematic ultrasonic-conventional comparative experiments. An ultrasonic leaching kinetics model was established which provided reliable technological guidance and basic theory for the comprehensive utilization of nickel-containing residue. In the study, it was found that ultrasonically-enhanced leaching for 40 min obtained the same result as conventional leaching for 80 min, and the Ni extraction degree reached more than 95%. According to the kinetic fitting of the leaching process, it was found that the sulfuric acid leaching process belonged to the diffusion-controlled model of solid product layers under conventional and ultrasonic conditions, and the activation energy of the reaction was Ea1 = 17.74 kJ/mol and Ea2 = 5.04 kJ/mol, respectively.

Effect of Trivalent Metal Cations on the Properties of LDHs Supercapacitors Prepared from Electroplating Sludge

2021 ◽  
Vol 1035 ◽  
pp. 1089-1095
Author(s):  
Jin Yun Zhu ◽  
Tao Jun Li ◽  
Li Chen ◽  
Tian Bao Liu ◽  
Xiu Ling Yan
Keyword(s):  
Acid Leaching ◽  
Metal Cations ◽  
Raw Material ◽  
Trivalent Metal ◽  
Specific Mass ◽  
Inhibition Effect ◽  
Electroplating Sludge ◽  
Leaching Solution ◽  
Supercapacitor Performance ◽  
Double Hydroxides

Trivalent metal cations are the basic composition of Layered Double Hydroxides (LDHs), however, the effect of metal cations on the supercapacitor performance of LDHs prepared from electroplating sludge has not been reported. In the present study the acid leaching solution of electroplating sludge was used as raw material, and Cr, Fe, Al and other common metal cations were added into the precursors to investigate the effect of trivalent metal cations on the supercapacitor performance of LDHs prepared from electroplating sludge. The experimental results show that the three kinds of metal cations can inhibit the specific mass capacitance of LDHs, and the sequence of inhibition effect is Fe < Al < Cr. This experiment is expected to provide some references for the resource utilization of electroplating sludge.

scholarly journals Kinetic Study in Atmospheric Pressure Organic Acid Leaching: Shrinking Core Model versus Lump Model

Minerals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 613
Author(s):  
Kevin Cleary Wanta ◽  
Widi Astuti ◽  
Indra Perdana ◽  
Himawan Tri Bayu Murti Petrus
Keyword(s):  
Citric Acid ◽  
Acid Solution ◽  
Acid Leaching ◽  
Core Model ◽  
Shrinking Core Model ◽  
Citric Acid Solution ◽  
Lumped Model ◽  
Leaching Process ◽  
Shrinking Core ◽  
Simulation Results

The kinetics study has an essential role in the scale-up process because it illustrates the real phenomena of a process. 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. As a raw material, this process used powder-shaped limonite laterite ores with a size of 125–150 µm. The leaching process is carried out using 0.1 M citric acid solution, F:S ratio of 1:20, and a leaching time of 2 h. The temperature parameter was varied at 303, 333, and 358 K. The experimental results showed that the higher the operating temperature, the higher the extracted nickel. The results of this experiment were used to evaluate the shrinking core kinetics model and the lumped model. The simulation results for both models show that the lumped model can provide better simulation results. Quantitatively, the percentage of errors from the shrinking core model is around 3.5 times greater than the percentage of errors from using the lumped model. This result shows that in this leaching process, the process mechanism that occurs involves the reactant diffusion step and the chemical reactions step; those steps run simultaneously.

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