Hydrometallurgical　experiments　are　generally　required　to　assess　the　appropriate　treatment　process　before　the　establishment　of　the　industrial　recovery　process　for　waste　battery　materials.　The　effects　of　acid　systems　and　oxidants　in　metal　leaching　were　studied.　The　comprehensive　leaching　effects　of　the　citric　acid　were　superior　to　the　sulfuric　acid.　The　potassium　permanganate　inhibits　the　dissolution　of　metals.　Thermodynamic　calculations　showed　that　metals　precipitate　more　easily　in　sulfuric　acid　system　than　in　citric　acid　system.　The　Fe　precipitation　efficiency　in　sulfuric　acid　system　was　90%　at　pH　3.5,　but　with　considerable　losses　of　Co　(　30%)　and　Ni　(　40%).　The　proper　pH　and　organic/aqueous　(O/A)　ratio　for　Fe　and　Zn　removal　with　Di-(2-ethylhexyl)　phosphoric　acid　extraction　were　2　and　0.5,　respectively;　while　for　the　removal　of　Cu　and　Mn,　the　best　pH　and　O/A　ratio　were　3　and　0.75,　respectively.　Crude　manganese　carbonate　and　a　cobalt-nickel　enriched　liquid　were　obtained　by　selective　precipitation　in　raffinate　using　an　ammonium　bicarbonate　solution.　In　citric　acid　systems,　the　precipitation　efficiency　of　Co,　Ni,　Mn,　Fe,　Cu　and　Zn　were　less　than　20%　at　pH　7.　The　proper　pH　and　O/A　ratio　for　the　separation　of　the　metals　in　two　groups　(Ni/Co/Cu　and　Mn/Fe/Zn)　were　1.5　and　2.　The　cobalt-nickel-copper　enriched　liquid　was　finally　obtained.