Process and plant for the treatment of run-down batteries

摘要

The invention concerns a process and related treatment plant for flat Zn/Mn alkaline batteries. The process comprises the following stages: pre-treatment (1) of the batteries comprising in succession the stages of grinding and separation of the two fractions (one coarse, one fine). The fine fraction undergoes the subsequent treatments, after washing in water to separate and recover the electrolytic solution contained in the batteries; acid-reducing leaching (2), using as reducing agent a carbohydrate chosen from among monosaccharides, oligosaccharides, polysaccharides and corresponding mixtures; purification (3) by cementation; separation (4) and recovery of metallic zinc and MnO 2 in forms that can be reused to produce new batteries; treatment of the solutions (5) by concentration and purification for the recovery of reagents and water. New batteries can be produced from zinc and manganese dioxide obtained via the process of the invention.