폐리튬이온전지 처리시 발생한 더스트 침출용액으로부터 Na2CO3와 (NH4)2CO3에 의한 리튬(I) 석출 비교
Comparison of Li(I) Precipitation from the Leaching Solution of the Dust from Spent Lithium-ion Batteries Treatment between Sodium Carbonate and Ammonium Carbonate
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초록
폐리튬이온전지를 고온에서 용융환원하면 금속혼합물, 슬라그와 리튬(I)을 함유한 분진이 발생한다. 분진의 침출 합성액을 이용하여Li2CO3 석출실험을 수행했다. 석출제의 종류와 비수용액의 첨가가 석출에 미치는 영향을 조사했다. (NH4)2CO3에서 해리된 암모늄과 탄산이온의 수화반응으로 인해 Na2CO3가 석출제로서 효과가 우수했다. 또한 용액에 아세톤이나 에탄올을 첨가하면 리튬(I)의 석출률이 증가했다. 특히 (NH4)2CO3을 석출제로 첨가한 조건에서 용액의 pH가 12까지 증가함에 따라 리튬(I)의 석출률도 증가했다. 동일한 석출조건에서 Na2CO3에 의한 리튬(I)의 석출률이 (NH4)2CO3보다 더 높았다.
Abstract
Smelting reduction of spent lithium-ion batteries results in metallic alloys, slag, and dust containing Li(I). Precipitation of Li2CO3 was performed using the synthetic leachate of the dust. Herein, the effects of the precipitant and addition of non-aqueous solvents on the precipitation of Li(I) were investigated. Na2CO3 was a more effective precipitating agent than (NH4)2CO3 owing to the hydrolysis reaction of dissolved ammonium and carbonate. The addition of acetone or ethanol improved the Li(I) precipitation percentage for both the precipitants. When using (NH4)2CO3, the Li(I) precipitation percentage increased at a solution pH of 12. Under the same conditions, the Li(I) precipitation percentage using Na2CO3 was much higher than that using (NH4)2CO3.
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