| 摘要 |
<p>PURPOSE: To recycle a waste by crushing a waste battery into fine broken pieces, adding them to an aqueous solution of sodium cyanide to react them by utilizing reaction heat, separating an unreacted component, oxidizing the sulfur of a sulfide in the separated aqueous solution into elemental sulfur, and treating it with free sodium cyanide. CONSTITUTION: A battery component containing sodium polysulfide and residual sodium, as the case may be, which is removed from a spent battery or battery case is mechanically crushed into fine broken pieces so as to have a particle size of 30mm, and they are treated with an aqueous solution of sodium cyanide having a mole ratio of 1:1 to the total sulfur consisting of S<0> or S<-2> with stirring. The insoluble component is separated from the solution. Using the resulting solution to which 0.1-20wt.% of manganese dioxide is added, air of room temperature-110 deg.C is introduced thereto, and the sulfur of a sulfide is oxidized by use of sodium cyanide and sodium thiocyanide, whereby only sodium polysulfide can be disposed while this sulfur is made reusable.</p> |
