METHOD FOR RECOVERING LEAD BATTERIES Russian patent published in 2007 - IPC H01M4/16 H01M10/12 

FIELD: electrical engineering; recovering storage batteries.

SUBSTANCE: proposed method for recovering lead storage batteries includes washing of active material covering positive plates and grid with distilled water, its drying, crushing, heat treatment at temperature of 450 - 500 °C to yellow color, whereupon paste is prepared by mixing powder with distilled water followed by addition of sulfuric acid solution of 1.40 g/cm³ specific gravity while intensively stirring it, its rubbing into plate in single operation, and compacting by rolling it first between rubber rolls, drying out at 120 °C for 20 - 25 s or weathering for 4 - 6 min, repeated rolling between rolls wrapped in gauze; ready plates are exposed to temperature of 45 - 50 °C and air humidity of minimum 95 % for 16 - 18 h, then held at same temperature and humidity reduced to 76 % for another 20 h, and dried out at temperature of 68 - 70 °C and air humidity of maximum 20 % for 12 - 14 h; negative plates with swollen active material are recovered without removal of active material from grids by compressing them with canvas spacers; prior to compressing negative plates are held in sulfuric acid of 1.83 g/cm³ specific gravity at temperature of 50 - 60 °C for 25 - 26 h, washed in distilled water, air-dried for 25- 26 h, washed with distilled water, air-dried for 1 - 2 h, and charged upon assembling the battery.

EFFECT: extended service life of recovered batteries, reduced their self-discharge and material input, enhanced use factor of source material.

1 cl, 1 tbl