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6648054 
Journal Article 
Effect of Acid Leaching on Upgrading the Graphite Concentrate from West Kalimantan (Indonesia) 
Syarifuddin, F; Florena, FF; Hanam, EkoS; Trisko, N; Kustiyanto, Eko; Enilisiana; Rianto, A; Arinton, G; , 
2016 
AMER INST PHYSICS 
MELVILLE 
WOS:000371896600044 
In this research an attempt has been done for upgrading the carbon content on processed graphite concentrate obtained from Sanggau Regency, West Kalimantan, Indonesia by acid leaching. The purpose of this research was to find optimal conditions for increasing graphite purity by eliminating the impurities, in particular, sillica - which is easy to remove by hydrofluoric acid. The concentrate contained 69.74% FC ranging from 149 mu m to 841 mu m. The optimal leaching parameters were time reaction 120 minutes, temperature 180 degrees C, solid-liquid ratio 1: 5 and purity of acid 48%. The determination of the carbon content showed that the carbon grade was 98% FC. 
Panatarani, C; Joni, IM; 
2nd Padjadjaran International Physics Symposium (PIPS) 
Jatinangor, INDONESIA