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http://dx.doi.org/10.7844/kirr.2021.30.6.36

Recovery of Pure Ni(II) Compound by Precipitation from Hydrochloric Acid Solution Containing Si(IV)  

Moon, Hyun Seung (Department of Advanced Materials Science & Engineering, Institute of Rare Metal, Mokpo National University)
Song, Si Jeong (Department of Advanced Materials Science & Engineering, Institute of Rare Metal, Mokpo National University)
Tran, Thanh Tuan (Department of Advanced Materials Science & Engineering, Institute of Rare Metal, Mokpo National University)
Lee, Man Seung (Department of Advanced Materials Science & Engineering, Institute of Rare Metal, Mokpo National University)
Publication Information
Resources Recycling / v.30, no.6, 2021 , pp. 36-42 More about this Journal
Abstract
Spent lithium-ion batteries are treated by reduction-smelting at high temperatures to recover valuable metals. Solvent extraction and precipitation of the HCl leaching solution of reduction-smelted metallic alloys resulted in a filtrate containing Ni(II) and a small amount of Si(IV). Adsorption and precipitation experiments were conducted to recover pure Ni(II) compounds from the filtrate. Si(IV) was selectively loaded onto polyacrylamide, but this method did not efficiently filter the solution due to an increase in viscosity. The addition of Na2CO3 as a precipitant to the filtrate led to the simultaneous precipitation of Ni(II) and Si(IV). However, it was possible to recover nickel oxalate with a purity higher than 99.99% by selectively precipitating Ni(II) with the addition of Na2C2O4 as a precipitant.
Keywords
Spent lithium ion batteries; Ni(II); Si(IV); precipitation; adsorption;
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