|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deriving Value from Challenging Waste Materials: Recycling and Sustainability Joint Session
||Synthesis of Magnesium Oxide from Ferronickel Smelting Slag through Hydrochloric Acid Leaching-Precipitation and Calcination
||Mohammad Zaki Mubarok, Andik Yudiarto
|On-Site Speaker (Planned)
||Mohammad Zaki Mubarok
At the present paper, synthesis of magnesia from ferronickel smelting slag is discussed. The first stage was extracting magnesium from the slag sample by leaching in HCl solution. Magnesium extraction of 97% was obtained from the leaching with HCl 8 molar, solid:liquid ratio 1:40 (gram/ml) and temperature 80oC after 24 hour. Solution purification was performed by adjusting solution’s pH at 95oC. At pH range of 3-4, iron precipitate was found as akagenite (FeO-OH). Nickel precipitations took place at pH range of 4-6, while dissolved Mg and Al started to precipitate in the forms of pyroaurite (Mg6Fe2CO3(OH)16∙4H2O) and hydrotalcite (Mg6Al2CO3(OH)16∙4H2O) at pH range of 8-9. High purity of brucite (Mg(OH)2) was obtained from Mg precipitation at pH range of 11-12, under stirring speed of 300 rpm and stirring time of 4 hour. High purity of MgO powder was obtained from the calcination of brucite at temperature of 1000oC for 240 minute.