Optimization of Recovery Process of Silver from Obsolete Printed Circuit Boards (PCBs)
Journal Title: Chemical Science International Journal - Year 2017, Vol 19, Issue 1
Abstract
Aims: The aim of this work was to optimize the Silver recovery from Printed Circuit Boards (PCBs) of waste computers using statistical method by varying various parameters affecting the recovery. Methodology: A total of 50 experimental runs was generated using central composite design, these were designed to study the effect viz; Thiourea conconcentration, H2SO4 conconcentration, Temperature, Particle diameter and time. Optimization was carried out using response surface methodology and validation of the result was also carried out. Results: Statistically significant quadratic model was obtained. A quadratic model predicted the optimum silver recovery of 66.01% at optimal condition of thiourea concentration, 0.01 g/ml, sulphuric acid concentration, 0.01 M, particle size, 0.027 mm, temperature, 20°C and time of 60 min. The optimal condition was validated and 66.1% of silver recovery was obtained. Conclusion: Response surface methodology was successively used to optimize thiourea leaching recovery of silver from PCBs of the waste computers. The result obtained could be scaled up to pilot plant.
Authors and Affiliations
Olusola Adesina, Ajetunmobi Akeem, Okewale Akindele
Keywords
Related Articles
- EP ID EP319585
- DOI 10.9734/CSIJ/2017/20034
- Views 99
- Downloads 0
Mathematical Modelling, Energy and Exergy Analysis of Tomato Slices in a Mixed Mode Natural Convection Solar Dryer
This paper reports the drying kinetics of tomato (Lycopersicon esculentum) with different drying loads in a fabricated mixed mode natural convection solar dryer. The energy utilization ratio (EUR) and exergetic efficienc...
Structural and Thermal Studies on Racemic BaC4H4O6•H2O
Single crystals of racemic barium tartrate monohydrate, BaC4H4O6•H2O, were grown at 308 K by a gel method using silica gel as the growth medium. Differential scanning calorimetry, thermogravimetric-differential thermal a...
Evaluation of Some Microbiological and Physico-chemical Composition of Domestic Wastewater in Rivers and Bayelsa States
Aims: This research study aims at ascertaining the inhibitive contributions of these domestic effluents even as they flow from drains into the rivers. Study Design: The microbiological and physico-chemical composition o...
Biodisinfection and Coagulant Properties of Mixed Garcinia kola and Carica papaya Seeds Extract for Water Treatment
Garcinia kola (Heckel) and Carica papaya (Linn.) seeds from ripe fruits were investigated for their disinfection and coagulation activity in water. The phytochemical analysis indicated the presence of alkaloid, saponins,...
A Review on Effect of Solvents on Fluorescent Spectra
When absorption spectra are measured in solvents of different polarity, it is found that the positions, intensities, and shapes of the absorption bands are usually modified by these solvents. These changes are a result o...