A secondary battery, a nickel hydrogen recovery of valuable metal from scrap

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PROBLEM TO BE SOLVED : To provide a method for economically recovering valuable metals such as nickel, cobalt or rare earth elements contained in nickel-hydrogen secondary battery scrap. SOLUTION : Recovered active material obtained by crushing a used nickel- hydrogen secondary battery and performing physical separation such as sieving is dissolved while blowing gaseous chlorine in hydrochloric acid. Nickel, cobalt and rare earth elements are recovered into a solution, and manganese is selectively precipitated, so that nickel, cobalt and rare earth elements, and manganese are separately recovered.