<![CDATA[The leaching of manganese from manganese dioxide ores in sulfuric acid solution was investigated. The effects of agitation, sulfuric acid concentration and solid/liquid mass ratio on the leaching efficiency of manganese were studied. In this study, manganese dioxide ores were treated by reduction roasting using charcoal as a reductant at 700 oC for 120 min. Then, roasted samples were subjected to extract manganese by sulfuric acid leaching. in each leaching test, 75 g of sample was put and leached in a glass reactor with 750 mL sulfuric acid solution. At the end of each leaching experiment, the slurry was filtered and filtrate was analyzed by Atomic Absorption Spectrometer. The experimental results indicated that the leaching rate increases with the increases of the agitation, sulfuric acid concentration and with the decreases of solid/liquid mass ratio. The optimal condition for leaching manganese from manganese dioxide ores was determined as the agitation of 400 rpm and sulfuric acid concentration of 12% for 180 min at 75 oC. Under the optimal condition, the leaching efficiency of manganese can reach 84.61%. Keywords : leaching, manganese ore, manganese sulfate, sulfuric acidABSTRAKProses pelindian mangan dari bijih mangan dioksida dalam larutan asam sulfat telah berhasil dilakukan. Tujuan penelitian untuk mempelajari pengaruh dari kecepatan pengadukan, konsentrasi asam sulfat dan perbandingan massa padatan/larutan terhadap mangan yang terekstrak. Dalam penelitian ini, bijih mangan dipreparasi melalui proses reduksi menggunakan arang pada 700 oC selama 120 menit selanjutnya dilindi menggunakan larutan asam sulfat. Pada setiap percobaan, sebanyak 75 gram sampel dimasukkan dan dilindi dengan 750 ml larutan H2SO4dalam gelas reaktor. Setelah proses pelindian, kemudian disaring dan dianalisa dengan menggunakan Atomic Absorption Spectrometer. Hasil percobaan menunjukkan bahwa laju pelindian meningkat dengan naiknya kecepatan pengadukan dan konsentrasi asam serta menurunnya rasio perbandingan persen padatan. Kondisi optimum diperoleh pada kecepatan pengadukan 400 rpm, konsentrasi asam sulfat 12% pada 75 oC selama 180 menit dengan mangan terekstrak sebesar 84,61%.Kata kunci : asam sulfat, bijih mangan, pelindian, mangan sulfat]]>
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