|
The Removal of Fe and Ca Elements from MnSO4 Precursor by CaCO3 Precipitation Method Research Center for Metallurgy, National Research and Innovation Agency, South Tangerang, Indonesia 15314 Abstract Battery is one of the renewable energy sources that serves as a solution to reduce CO2 gas emissions. Lately, the utilization of manganese as a raw material for lithium battery electrodes has been developed. Manganese electrode battery raw materials can be synthesized from manganese leachate solution with sulfuric acid to produce manganese sulfate (MnSO4) products. However, the manganese leaching process with sulfuric acid produces impurities, two of which are iron and calcium. When used as battery electrodes, these impurities reduce battery capacity efficiency. This study aims to reduce impurities in the resulting MnSO4 leachate solution, especially iron and calcium impurities. The method used to precipitate iron is titration using 25% w/w CaCO3, while precipitating impurities is done by chemical precipitation using NH4F. The resulting solution is characterized using ICP OES, while the precipitate is characterized using XRD, XRF, and SEM EDS. The results show that iron can be precipitated up to 100% at pH 4, a temperature of 90 C, and a duration of 3 hours. For calcium ion precipitation, it can be achieved up to 99.6% with the addition of 3.5 grams of NH4F at a heating temperature of 50 C and a duration of 30 minutes. However, with these variables, a significant amount of manganese is also precipitated. The iron compound obtained in the iron impurity precipitate is goethite, while the calcium compound obtained in the calcium impurity precipitate is calcium fluoride. Keywords: Lithium battery, Manganese sulfate, sulfuric acid leaching, alkaline precipitation Topic: Mining Engineering and metallurgy |
| ICPMGET 2024 Conference | Conference Management System |