The spent zinc-carbon batteries are composed of approximately 20% of Mn, 20% of Zn, magnetic materials and small amounts of carbon, plastics and electrolyte. Some of zinc metals in the spent battery reacted into zinc oxides and some of $MnO_2$ reduced into $Mn_2O_3$ after discharging reaction. In this study, acid and alkaline processes of spent zinc-carbon battery are proposed and there performances are compared. In case of $H_2SO_4$, the results of zinc and manganese dissolution rates obtained by adding $H_2O_2$ were 93.3% and 82.2%, respectively at 100g/L solid/liquid ratio, 2.0M $H_2SO_4$, $60^{circ}C$ and 200 rpm. In case of NaOH, the results of zinc and manganese dissolution rates obtained at 100g/L solid/liquid ratio, 4M NaOH, $80^{circ}C$ and 200 r.p.m. were 82% and below 0.1% respectively. Therefore, the efficiency of selective extraction of Zn was very high.