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4. Reductive leaching of low-grade manganese ores from Way Kanan using corncob as reductant

Author

Putri, Yolanda Dwika, Astuti, Widi, Lesmana, Donny, Br Ginting, Simparmin, and Sujoto, Vincent Sutresno Hadi

Abstract

The processing of mining products in indonesia has not been utilized optimally. One of them is manganese ore. Way kanan is one of indonesia's potential manganese ore sites. The manganese leaching study used a -200 mesh way kanan manganese ore that was reacted with sulfuric acid at concentrations of 0.1 M, 0.5 M, and 1 M, as well as corncob as a reductant. To separate the dissolved iron in the leaching process, the manganese sulfate solution was purified with sodium hydroxide and then filtered to have a manganese sulfate solution free of iron. Manganese was precipitated using oxalic acid. The manganese oxalate precipitation was calcined at a temperature of 350 °c for two hours. The best manganese extraction obtained at 92.3% was at a sulfuric acid concentration of 1 M, a temperature of 80 °c, and a solution volume of 400 ml. Calcination of manganese oxalate converted the material into hausmannite (Mn3O4).

Published
2023

6. Adsorpsi Logam Berat Menggunakan Selulosa Xanthat dari Bagas Tebu

Author

Dewi Agustina Iryani, University of Lampung, Department of Chemical Engineering, Iryani, Dewi Agustina, Risthy, Nisa Meutia, Br. Ginting, Simparmin, Darmansyah, Darmansyah, Dewi Agustina Iryani, University of Lampung, Department of Chemical Engineering, Iryani, Dewi Agustina, Risthy, Nisa Meutia, Br. Ginting, Simparmin, and Darmansyah, Darmansyah

Abstract

The most effective way to reduce the pollution of heavy metal waste is the adsorption process using an adsorbent. Sugarcane bagasse is one of materials that has high affinity to absorb heavy metals. The adsorption capacity of sugarcane bagasse can be increased by converting it into cellulose xanthate by reaction of cellulose with carbon disulfide (CS2). Synthesis of cellulose xanthate consists of three stages, i.e isolation, alkalization, and xanthation. In this study, the preparation of cellulose xhantate was conducted by adding carbon disulfide (CS2) about 180% (w/w). The temperature of xhantation reaction was varied at 35°C, 40°C and 45°C. The effect of temperature reaction into degree of substitution (DS), the degree of polymerization (DP) and the metal adsorption capacity of cellulose xanthate for Zn2+ and Pb2+ were determined by quantitative and qualitative analyze. Morphological characteristics of cellulose xanthate was characterized by SEM and the functional groups contained in the cellulose xanthate was characterized by FTIR. The result showed that cellulose xanthate synthesized at temperature of 35°C have a highest value of DS, DP, and the adsorption capacity higher than two variations of temperature (40°C and 45°C). The value of DS, DP, and the adsorption capacity is 0.389, 299.27, 48.353 mg/g for Zn2+ metal and 51.763 mg/g for the metals Pb2+, respectively

Published
2019

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