Valuable metals, and especially copper and silver, are recovered from a lead containing electrolyte in a process in which the electrolyte is fed into an electrochemical polishing reactor that has a high-surface area cathode at which the electrode potential is controlled to so preferentially reduce copper and silver and to form a pre-treated lead-enriched electrolyte that can then be subjected to electrochemical lead recovery.
Lead is recovered from lead paste of a lead acid battery in a continuous and electrochemical lead recovery process. In especially preferred aspects, lead paste is processed to remove residual sulfates, and the so treated lead paste is subjected to a thermal treatment step that removes residual moisture and reduces lead dioxide to lead oxide. Advantageously, such pretreatment will avoid lead dioxide accumulation and electrolyte dilution.
Lead is recycled from lead paste of lead acid batteries in a process that employs alkaline desulfurization followed by formation of plumbite that is then electrolytically converted to pure lead. Remaining insoluble lead dioxide is removed from the lead plumbite solution and reduced to produce lead oxide that can be fed back to the recovery system. Sulfate is recovered as sodium sulfate, while the so produced lead oxide can be added to lead paste for recovery.
C22B 7/00 - Mise en œuvre de matériaux autres que des minerais, p.ex. des rognures, pour produire des métaux non ferreux ou leurs composés
C22B 3/12 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés par lixiviation dans des solutions inorganiques alcalines
C22B 3/22 - Traitement ou purification de solutions, p.ex. de solutions obtenues par lixiviation par des procédés physiques, p.ex. par filtration, par des moyens magnétiques
C25C 1/18 - Production, récupération ou affinage électrolytique des métaux par électrolyse de solutions du plomb
H01M 10/54 - Récupération des parties utiles des accumulateurs usagés
4.
SYSTEMS AND METHODS FOR RECOVERY OF LEAD FROM LEAD ACID BATTERIES
Lead is recovered from lead paste of a lead acid battery in a continuous process. The lead paste is contacted with a base to generate a supernatant and a precipitate. The precipitate is separated from the supernatant, and is contacted with an alkane sulfonic acid to generate a mixture of lead ion solution and insoluble lead dioxide. The lead dioxide is reduced with a reducing agent to form lead oxide, and the lead oxide is combined with the lead ion solution to form a combined lead ion solution to so allow a continuous process without lead dioxide accumulation. Lead is recovered from the combined lead ion solution using electrolysis.
C25C 1/18 - Production, récupération ou affinage électrolytique des métaux par électrolyse de solutions du plomb
C22B 3/22 - Traitement ou purification de solutions, p.ex. de solutions obtenues par lixiviation par des procédés physiques, p.ex. par filtration, par des moyens magnétiques
C22B 3/44 - Traitement ou purification de solutions, p.ex. de solutions obtenues par lixiviation par des procédés chimiques
C22B 7/00 - Mise en œuvre de matériaux autres que des minerais, p.ex. des rognures, pour produire des métaux non ferreux ou leurs composés
C25C 7/08 - Séparation des métaux déposés à la cathode
H01M 10/54 - Récupération des parties utiles des accumulateurs usagés
A closed loop electrochemical process of recovery of high-purity lead uses continuous formation of adherent lead on a cathode from an electrolyte that is used to dissolve desulfated lead paste. Preferred cathodes include aluminum containing cathodes that are operated in methane sulfonic acid to produce a micro- or nanoporous mixed matrix metallic composition and lead dioxide formation at the anode is avoided using appropriate anode configurations or operating conditions
Lead from lead acid battery scrap is recovered in two separate production streams as clean grid lead and as high-purity lead without smelting. In preferred aspects, lead recovery is performed in a continuous process that uses an aqueous electroprocessing solvent and electro- refining. Spent electroprocessing solvent and/or base utilized to treat lead paste from the lead acid battery scrap can be recycled to the recovery process.
Lead from lead acid battery scrap is recovered in two separate production streams as clean grid lead and as high-purity lead without smelting. In preferred aspects, lead recovery is performed in a continuous process that uses an aqueous electroprocessing solvent and electro-refining. Spent electroprocessing solvent and/or base utilized to treat lead paste from the lead acid battery scrap can be recycled to the recovery process.
Lead from lead acid battery scrap is recovered in two separate production streams as clean grid lead and as high-purity lead without smelting. In preferred aspects, lead recovery is performed in a continuous process that uses an aqueous electroprocessing solvent and electro-refining, and spent electroprocessing solvent can be recycled to the recovery process.
H01M 10/54 - Récupération des parties utiles des accumulateurs usagés
C25C 1/18 - Production, récupération ou affinage électrolytique des métaux par électrolyse de solutions du plomb
H01M 4/14 - PROCÉDÉS OU MOYENS POUR LA CONVERSION DIRECTE DE L'ÉNERGIE CHIMIQUE EN ÉNERGIE ÉLECTRIQUE, p.ex. BATTERIES Électrodes Électrodes composées d'un ou comprenant un matériau actif Électrodes pour accumulateurs au plomb
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