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"Indonesia merupakan salah satu negara yang memiliki deposit bijih nikel laterit terbesar di dunia. Maka dari itu tuntutan produksi nikel di Indonesia sangat tinggi. Hal itu menyebabkan jumlah smelter pengolahan feronikel semakin meningkat. Setiap satu ton feronikel hasil peleburan menghasilkan delapan ton terak feronikel. Hingga saat ini pemanfaatan terak feronikel di Indonesia masih sangat minim. Penelitian ini menjelaskan tentang peningkatan kadar besi dan magnesium dari terak feronikel dengan metode hidrometalurgi menggunakan pelindian asam sulfat (H2SO4) dengan variasi konsentrasi 0,5, 1,0, 1,5, 2,0, dan 2,5 M, variasi temperatur 32, 50, dan 90°C, serta variasi waktu 10, 20, 30, 60, dan 90 menit untuk mendapatkan kondisi paling efisien. Setelah dilakukan pelindian dilanjutkan ke proses karakterisasi ICP-OES, XRD, dan XRF. Dari karakterisasi didapatkan hasil ekstraksi Fe dan Mg terbesar yaitu 99,12% dan 99,08% pada variabel konsentrasi 2,5 M, temperatur 90°C, dan waktu 90 menit.......Indonesia has one of the world’s largest laterite nickel ore deposits. Therefore, the demand for nickel production in Indonesia is very high. This causes the number of ferronickel processing smelters to increase. Every ton of ferronickel smelter produces eight tons of ferronickel slag. Until now, the utilization of ferronickel slag in Indonesia is still very limited. This study aimed to extract iron (Fe) and magnesium (Mg) concentration from ferronickel slag by hydrometallurgical method using sulfuric acid (H2SO4) leaching with various concentrations of 0.5, 1.0, 1.5, 2.0, and 2.5 M, temperature variations 32, 50, and 90°C, as well as time variations of 10, 20, 30, 60, and 90 minutes to get the most efficient conditions. Several characterizations including ICP-OES, XRD, and XRF were carried out in order to elucidate as well as calculate percentage of the extracted Fe and Mg. The optimum conditions for extraction of both Fe and Mg were at 90°C for 90 minutes under 2,5 M H2SO4 with the highest extraction of Fe and Mg were 99,12% and 99,08%, respectively."

"Mengisolir logam dari bahan korosi merupakan adalah cara yang paling efektif untuk mencegah korosi pada industri minyak dan gas bumi. Penggunaan inhibitor korosi alami menjadi alternatif baru untuk mencapai tujuan tersebut. Bahan alam dipilih sebagai alternatif karena bersifat aman, mudah didapatkan, bersifat biodegradable, biaya murah, dan ramah lingkungan. Penelitian ini dilakukan untuk mempelajari perilaku inhibisi ekstrak kulit sawo & dibandingkan dengan inhibitor kimia, menggunakan metode polarisasi. Untuk karakterisasi sampel digunakan FTIR, OES, OM, hingga software LENNTECH calculator, serta program NOVA 1.8 dengan mesin AUTOLAB PGSTAT. Laju korosi turun dan mencapai maksimum dengan penambahan 8ml ekstrak kulit sawo dan 2ml inhibitor kimia. Efisiensi inhibisi ekstrak kulit sawo mencapai 43,02% akibat kondisi pH yang tidak optimal (antara 4,6 hingga 5,9). Berdasarkan Kurva Polarisasi, Ecorr, Rapat Arus, dan Resistansi Polarisasi, dapat disimpulkan bahwa ekstrak kulit sawo memiliki mekanisme adsorpsi (inhibitor anodik) dan inhibitor kimia dengan mekanisme adsorpsi dan sekedar memblokir reaksi pada permukaan logam. Terbentuknya deposit ferric tannate pada permukaan logam menjadi bukti penting terhadap mekanisme inhibisi ekstrak kulit sawo, yang mengandung senyawa tannin.

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Isolate the metal from corrosion of materials is the most effective way to prevent corrosion in oil and gas industry. The use of green corrosion inhibitor become a new alternative to achieve that goal. Green inhibitor chosen as an alternative because it is safe, easily available, biodegradable, low cost, and environmentally friendly.

This study was conducted to study the inhibition behavior of sapodilla skin extract and compared with chemical inhibitor, using the polarization method. For characterizing of samples are used FTIR, OES, OM, LENNTECH calculator software, and NOVA 1.8 software with AUTOLAB PGSTAT machine.

Corrosion rate decreased and reached a maximum with the addition of 8 ml sapodilla skin extract and 2 ml of chemical inhibitor. Inhibition efficiency of sapodilla skin extract reach 43,02%, due to pH condition are not optimal (between 4,6 to5,9 ). Based on the polarization curve, Ecorr, current density, and polarization resistance, it can be concluded that the sapodilla skin extract has a mechanism of adsorption (anodic inhibitor) and chemical inhibitor with the mechanism of adsorption, to block reaction at metal surface. Formation of ferric tannate deposition on metal surface become important proof for the mechanism of inhibition sapodilla skin extract, which containing tannin compound."

"Mengisolir logam dari bahan korosi merupakan adalah cara yang paling efektif untuk mencegah korosi pada industri minyak dan gas bumi. Penggunaan inhibitor korosi alami menjadi alternatif baru untuk mencapai tujuan tersebut. Penelitian ini dilakukan untuk mempelajari perilaku inhibisi ekstrak ubi ungu dan dibandingkan dengan inhibitor kimia, menggunakan metode polarisasi. Penelitian ini dilakukan untuk mempelajari perilaku inhibisi ekstrak ubi ungu dengan dibandingkan dengan inhibitor kimia, menggunakan metode polarisasi. Untuk karakterisasi sampel digunakan FTIR, OES, OM, hingga software LENNTECH calculator, serta program NOVA 1.8 dengan mesin AUTOLAB PGSTAT. Laju korosi turun dan mencapai maksimum dengan penambahan 4 ml ekstrak ubi ungu dan 2 ml pada inhibitor kimia. Efisiensi inhibisi ekstrak ubi ungu mencapai 53,54% merupakan nilai inhibisi optimal yang didapatkan. Berdasarkan Kurva Polarisasi, Ecorr dan Icorr dapat disimpulkan bahwa ekstrak ubi ungu dan inhibitor kimia memiliki kecenderungan mekanisme inhibitor anodik dengan adannya lapisan pasif. Mekanisme inhibitor anodik dengan kecendrungan lapisan pasif menjadi bukti pentinng mekanisme inhibisi ekstrak ubi ungu.

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Isolate the metal from corrosion of materials is the most effective way to prevent corrosion in oil and gas industry. The use of green corrosion inhibitor become a new alternative to achieve that goal. This study was conducted to study the inhibition behavior of sweet potato extract and compared with chemical inhibitor, using the polarization method.

This study was conducted to study the inhibition behavior of sweet potato extract and compared with chemical inhibitor, using the polarization method. For characterizing of samples are used FTIR, OES, OM, LENNTECH calculator software, and NOVA 1.8 software with AUTOLAB PGSTAT machine.

Corrosion rate decreased and reached a maximum with the addition of 4 ml sweet potato extract and 2 ml of chemical inhibitor. Inhibition efficiency of sweet potato extract reach 53,54%. Based on the polarization curve, Ecorr, current density, it can be concluded that the sweet potato extract has a mechanism of anodic inhibitor, to block reaction at metal surface. The anodic mechanism which existence of passive film becomes important evidence of inhibition mechanism of sweet potato extract."