Process for regenerating sodium sulphide from the sodium...

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H01M 10/54 (2006.01) C01B 17/22 (2006.01) C01F 11/46 (2006.01) H01M 10/12 (2006.01)

Patent

CA 2222514

A hydrometallurgical process is described for regenerating sodium sulphate used for sulphuration of Pb paste from exhausted batteries, with a view to electrochemical recovery of the lead. The elemental sulphur reacts rapidly with an aqueous lime suspension (heated to between 90 and 100°C) in accordance with the reaction 3Ca(OH)2 + 4S° --> 2CaS + CaS2O3 + 3H2O (1) CaS and CaS2O3 remain in the solution, which is added hot to a concentrated solution of sodium sulphate, to effect the double exchange reaction: 2CaS + CaS2O3 + 3Na2SO4 --> 2Na2S + Na2S2O3 + 3CaSO4 (2) The calcium sulphate precipitates in easily separable crystalline form and leaves the cycle. The filtered sodium sulphide and thiosulphate solution is advantageously used for converting the various paste components into PbS. In this respect, the products of the reaction between the solution and the paste components (PbSO4, PbO, PbO2) are PbS and SO4 2-, so that after separating the PbS by filtration the sodium sulphate solution can be concentrated and recycled to reaction 2).

Procédé hydrométallurgique pour régénérer du sulfate de sodium utilisé pour la sulfuration de pâte de plomb provenant de piles épuisées, avec possibilité de récupération électrochimique du plomb. Le soufre élémentaire réagit rapidement avec une suspension aqueuse de chaux (chauffée entre 90 et 100 degrés C) selon la réaction 3Ca(OH)2 + 4S --> 2CaS + CaS2O3 + 3H2O (1); CaS et CaS2O3 demeurent dans la solution, qui est ajoutée à chaud à une solution concentrée de sulfate de sodium pour produire la double réaction d'échange : 2CaS + CaS2O3 + 3Na2SO4 --> 2Na2S + Na2S2O3 + 3CaSO4 (2). Le sulfate de calcium précipite sous forme cristallisée facilement séparable et sort du cycle. Le sulfure de sodium filtré et la solution de thiosulfate sont avantageusement utilisés pour la conversion des divers constituants de la pâte en PbS. Les produits de la réaction entre la solution et les constituants de la pâte (PbSO4, PbO, PbO2) sont PbS et SO4 2-, de telle façon qu'après séparation du PbS par filtration, la solution de sulfate de sodium peut être concentrée et recyclée vers la réaction (2).

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