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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium REWAS 2022: Recovering the Unrecoverable
Presentation Title Recovery of Precious Metal Silver from Scrap Computer Keyboards
Author(s) Rekha Panda, Om Shankar Dinkar, Pankaj Kumar Choubey, Rukshana Parween, Manis Kumar Jha, Devendra Deo Pathak
On-Site Speaker (Planned) Rekha Panda
Abstract Scope Silver (Ag) is extensively used in manufacturing of electronic goods due to its low-cost and conductivity. In view of the escalating demand, stringent environmental rules and limited primary sources of Ag, present paper is focused on the development of hydrometallurgical process flow-sheet to extract Ag from scrap computer keyboards. These keyboards contain ~0.4% Ag. Initially, scrap keyboards were dismantled to separate the Mylar sheet containing Ag. The same was pyrolysed at 300 C for 2 h to get enriched metallic part (~2%). About 99.99% Ag was leached using 2 M HNO3 at 60 C within 30 min in closed and proper condensed system. Separation techniques (precipitation/ cementation) could be use to obtain high purity Ag salt/ metal. Based on the laboratory scale experiments, the process flow-sheet developed is economical, eco-friendly and has potential to be translated to industry for commercial exploitation after scale up/ pilot trial.
Proceedings Inclusion? Planned:
Keywords Extraction and Processing, Hydrometallurgy, Recycling and Secondary Recovery


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BlueMetals Technology – Experience from Commissioning E-Scrap Recycling Plants
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Characterization and Thermal Treatment of Eggshell and Olive Stones for Heavy Metals Removal in Mining Environmental Liabilities Sites
Characterization and Thermal Treatment of Electric Arc Furnace Dusts Generated during Steel Production in Peruvian Industries
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Development of Technology for Recycling Large-capacity Lithium-ion Batteries for EV,ESS
Efficient Steel Mill Dust Recycling – Aiming For Zero Waste
Estimation of the Generation and Value Recovery from E-waste Printed Circuit Boards: Bangladesh Case Study
Extraction of Nickel from Recycled Lithium-ion Batteries
Investigation of Hydrometallurgical Recycling Parameters of WC-Co Cutting Tool Scraps
Leaching of Rare Earth Elements from Phosphogypsum Using Mineral Acids
Maximizing the Efficiency of By-product Treatment by Multi Metal Recovery and Slag Valorization
Physicochemistry of Lithium-ion Battery Recycling Processes
Pre-study of the Dissolution Behavior of Silicon Kerf Residue in Steel
Recent Trend on the Studies of Recycling Technologies of Rare Earth Metals
Recovery of Copper, Iron and Alumina from Metallurgical Waste by Use of Hydrogen
Recovery of Precious Metal Silver from Scrap Computer Keyboards
Recovery of Terbium, Europium, and Yttrium from Waste Fluorescent Lamp Using Supercritical Fluid Extraction
Recycling of Electronic Wastes, Waste Batteries and Rare Metal Wastes in China
Recycling of Tungsten by Molten Salt Processes
Recycling Technologies Developed at KIGAM
Setting New Standards for Circular Economy in the Cement Industry
Shifting the Burden of Selectivity from Chemical to Physical Separation Processes via Selective Sulfidation
Utilization of Copper Nickel Sulfide Mine Tailings for CO2 Sequestration and Enhanced Nickel Sulfidization
Yellow Phosphorus Production from Phosphoric Acid by Carbothermic Reduction

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