Tin (Sn) Recovery from Wave Soldering Lead Free Solder Dross via Hydrochloric Acid Leaching and Combustion Treatment

Ismail, Syarifah Aminah; Jamil, Noorina Hidayu; Kamarudin, H.; Salleh, Mohd Arif Anuar Mohd

doi:10.4028/www.scientific.net/msf.857.535

Cited by 3 publications

(1 citation statement)

References 10 publications

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“…A number of ways of separating base metals from different types of lead-containing solder waste have, however, been proposed, some of which might be used in the treatment of tin–silver WSD. These include the reduction of tin and lead oxides through contact with either gaseous hydrogen (Ahmed, 2010), mixtures of anthracite and graphite (Mitchell and Parker, 1988), or with coke followed by leaching of the reduced products with HCl (Dobo et al, 2012; Harangi, 2014; Ismail et al, 2016). Carbothermic reduction of solder dross has also been suggested (Harangi and Kékesi, 2014; Lucheva et al, 2011), or vacuum separation (Yang et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Tin and silver recovery from wave soldering dross

García‐Díaz

López

2018

Waste Manag Res

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This work proposes a method for the recovery of tin and silver from wave soldering dross produced during the manufacture of printed circuit boards. Samples of wave soldering dross were first subjected to carbothermic reduction to obtain an ingot containing the above metals plus other elements. This ingot was then subjected to electrorefining at different densities of electrical current, electrolyte flow rate, and cathode-anode separation distance, to determine the optimum conditions for recovering pure tin. Under such conditions, 82 wt% of the tin in the ingot was recovered at a purity of 99.94%. After subjecting ingots to continuous electrorefining under optimum conditions for 845 h, the slime collected at the anode was removed for the recovery of silver. This slime was subjected to thin-layer leaching with concentrated nitric acid. The leachate produced was subjected to copper-cementation; the silver adhering to the copper rod was collected by washing. This process recovered 92% of the silver in the wave soldering dross ingot at a purity of >99.6%. Some 99% of the copper entering the leachate from the copper rod during cementation was recovered by liquid-liquid extraction with 40% LIX84 (dissolved in EXXOL D100). This method could provide a rapid, inexpensive means of recovering pure tin and silver from wave soldering dross.

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Section: Introductionmentioning

confidence: 99%

Tin and silver recovery from wave soldering dross

García‐Díaz

López

2018

Waste Manag Res

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Review: Special brazing and soldering

Chen

et al. 2020

Journal of Manufacturing Processes

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Tin, silver, and copper sulfate compound extraction from lead-free solder dross by reduction with petroleum coke, electrorefining, cementation, and crystallization process

KHUMKOA,

MA-UD,

PATCHARAWIT

et al. 2024

J Met Mater Miner

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Solder dross, a waste by-product from the electronic component dipping bath, contains significant quantities of valuable metals. This study presents a four-step process for recovering tin, silver, and copper from lead-free Sn-Ag-Cu solder dross. The process involves the initial reduction of the dross using petroleum coke to produce an anode plate, followed by electrorefining to extract tin from the anode plate. Selective leaching of silver and copper from the residual anode slime and cementation techniques are employed to recover silver powder. The rest of the copper solution was used to synthesize copper sulfate crystals. Experimental results demonstrate optimal conditions for the reduction process, resulting in a high tin recovery rate of 92.88%. The electrorefining step yields tin with a purity of 99.94%. Silver and copper are successfully recovered from the anode slime, achieving purities of 99.60% for recovered silver powder and 99.90% for crystallized copper sulfate compounds. This comprehensive study offers insight into the efficient extraction and recovery of tin and other valuable metals from lead-free solder dross.

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Tin (Sn) Recovery from Wave Soldering Lead Free Solder Dross via Hydrochloric Acid Leaching and Combustion Treatment

Cited by 3 publications

References 10 publications

Tin and silver recovery from wave soldering dross

Tin and silver recovery from wave soldering dross

Review: Special brazing and soldering

Tin, silver, and copper sulfate compound extraction from lead-free solder dross by reduction with petroleum coke, electrorefining, cementation, and crystallization process

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