Process for the removal of sodium polysulphide from run-down...

Details Process for the removal of sodium polysulphide from run-down... Process for the removal of sodium polysulphide from run-down...

C - Chemistry, Metallurgy

01

C

23/26, 23/364

C01C 3/20 (2006.01) B09B 3/00 (2006.01) C22B 7/00 (2006.01) H01M 10/54 (2006.01)

Patent

CA 2032768

In a process for the removal of sodium polysulphide from run-down sodium/sulphur batteries, the cells are crushed while taking safety measures. The scrap metal is treated in a sodium cyanide solution and on separating the insoluble components the solution obtained is treated with air in the presence of manganese dioxide. The solution then contains sodium thiocyanate and sodium hydroxide. The latter can be reacted with CO2Na2CO3, precipitated and separated out.

Dans un procédé pour l'élimination du polysulfure de sodium dans les accumulateurs sodium-soufre usés, les éléments sont broyés en prenant les mesures de sécurité voulues. Le métal récupéré est traité dans une solution de cyanure de sodium et après séparation des constituants insolubles, la solution obtenue est traitée avec l'air en présence de dioxyde de manganèse. La solution renferme alors du thiocyanate de sodium et de l'hydroxyde d e sodium. On peut faire réagir ce dernier avec CO2Na2CO3, puis séparer le précipité formé.

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