Patent · US Expired

Method of removing sodium polysulfide from used sodium/sulfur batteries

US5055283A · kind A · utility

2Cited by

11References

12Claims

0Family size

Assignee

Degussa AG · DE

Inventors

Edgar Bilger · Hasselroth, DE
Urban Gubisch · Gelnhausen, DE

Key dates

Filing date	Dec 14, 1990
Grant date	Oct 8, 1991
Priority date	—
Expiry date	Dec 14, 2010

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02W30/84
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A method for removing sodium polysulfide from used sodium/sulfur batteries provides that the cells are granulated under protective measures, the scrap is treated in a solution of sodium cyanide and the solution obtained is treated with air. The solution then contains sodium thiocyanate and sodium hydroxide, which latter can be reacted by means of CO.sub.2 to Na.sub.2 CO.sub.3, precipitated and separated.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.