Optimization of Recovery Process of Silver from Obsolete Printed Circuit Boards (PCBs)

Adesina, Olusola and Akeem, Ajetunmobi and Akindele, Okewale (2017) Optimization of Recovery Process of Silver from Obsolete Printed Circuit Boards (PCBs). Chemical Science International Journal, 19 (1). pp. 1-8. ISSN 2456706X

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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.

Item Type: Article
Subjects: Eprints STM archive > Chemical Science
Depositing User: Unnamed user with email admin@eprints.stmarchive
Date Deposited: 06 May 2023 10:27
Last Modified: 13 Jan 2024 04:33
URI: http://public.paper4promo.com/id/eprint/328

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