Path: TopS1-Final ProjectMetallurgical Engineering-FTTM2017

STUDI PENGARUH PENAMBAHAN BIOPOLIMER PIONEERA L-800 PADA PERFORMA PELINDIAN BIJIH NIKEL LIMONIT DARI SOROWAKO DALAM LARUTAN ASAM SULFAT

STUDY OF THE PIONEERA L-800 BIOPOLIMER ADDITION AT THE LEACHING PERFORMANCE OF NICKEL LIMONITES ORE FROM SOROWAKO IN SULFURIC ACID SOLUTION

Undergraduate Theses from JBPTITBPP / 2017-09-27 10:37:15
Oleh : KAUTSAR HANIEF FITRIANSYAH, S1 - Metallurgy
Dibuat : 2017-09-14, dengan 1 file

Keyword : pelindian, nikel, viskositas, biopolimer Pioneera L-800, persen ekstraksi

Pada pabrik ekstraksi logam secara hidrometalurgi, terdapat beberapa parameter yang umumnya digunakan untuk mengevaluasi unjuk kerja pabrik yang meliputi persen ekstraksi dan total perolehan logam, kapasitas produksi, laju proses dan unit konsumsi bahan habis. Persen ekstraksi proses pelindian dipengaruhi oleh beberapa faktor seperti fraksi ukuran bijih, kadar logam dalam bijih yang diolah (grade), konsentrasi reagen pelindi, temperatur, persen padatan dan lama waktu proses. Salah satu cara yang dapat dilakukan untuk meningkatkan kapasitas produksi dan perolehan secara bersamaan adalah dengan menurunkan viskositas slurry pada persen padatan yang lebih tinggi. Pada penelitian ini dipelajari pengaruh penambahan biopolimer berbasis lignin yaitu Pioneera L-800 terhadap performa pelindian bijih nikel laterit dalam larutan asam sulfat pada tekanan atmosfer. Pada penelitian sebelumnya untuk ekstraksi emas, biopolimer Pioneera L-800 ini dilaporkan dapat menurunkan viskositas slurry dan mendispersi partikel padatan bijih dalam slurry sehingga dapat meningkatkan persen ekstraksi logam.



Serangkaian percobaan pelindian dalam larutan asam sulfat menggunakan biopolimer Pioneera L-800 telah dilakukan untuk mempelajari pengaruhnya terhadap persen esktraksi dan kinetika pelindian nikel. Percobaan dilakukan dengan variasi temperatur, konsentrasi asam sulfat, dosis Pioneera L-800, dan persen solid. Pelindian dilakukan selama 12 jam dengan pengambilan sampel larutan pada menit ke-15, 30, 60, 120, 240, 480, dan 720. Pengukuran konsentrasi nikel, besi, dan magnesium terlarut dilakukan menggunakan Atomic Absorption Spectrophotometer (AAS) untuk menentukan persen ekstraksi dan jumlah oksida terlarut. Kinetika pelindian dipelajari dengan menggunakan shrinking core model untuk menentukan pengendali laju reaksi dan energi aktivasi proses pelindian.



Hasil percobaan menunjukkan peningkatan temperatur dan konsentrasi asam meningkatkan persen ekstraksi nikel, sementara peningkatan persen solid cenderung menurunkan persen ekstraksi nikel. Penggunaan biopolimer Pioneera L-800 dengan dosis 1200 ppm dapat menurunkan viskositas slurry sebesar 13,6% dan meningkatkan persen ekstraksi nikel sebesar 10,44% dari 84,94% tanpa biopolimer menjadi 93,81% pada konsentrasi asam sulfat 6M dan persen solid 20%. Peningkatan ekstraksi nikel diikuti oleh peningkatan ekstraksi besi terlarut dimana persen besi terlarut tertinggi sebesar 97,45% diperoleh pada penambahan Pioneera L-800 sebesar 1200 ppm pada konsentrasi asam sulfat 4,5M dan persen solid 15%.



Penambahan biopolimer menurunkan energi aktivasi proses pelindian dari 142,41 kJ/mol ke 136,61 kJ/mol dan mempercepat laju pelindian. Analisis kinetika menunjukkan bahwa pelindian bijih nikel laterit dalam larutan asam sulfat tanpa dan dengan biopolimer Pioneera L-800 terkendali oleh difusi melalui lapis produk padat yang tidak bereaksi.

Deskripsi Alternatif :

In a hydrometallurgical plant, there are several parameters generally used to evaluate the performance of the plant, which includes metal extraction and recovery, production capacity, rate of processes and unit consumption of reagents. The extraction percentage of the leaching process is influenced by several factors such as the ore size fraction and grade, concentration of the leaching reagent, temperature, solid percentage and process duration. One of the methods that can be done to increase throughput and recovery simultaneously is by decreasing the viscosity of slurry at a higher solid percentage. The effect of addition of lignin-based biopolymer of Pioneera L-800 on the performance of laterite nickel leaching in sulfuric acid solution at atmospheric pressure was carried out. In the previous studies for the extraction of gold, the Pioneera L-800 biopolymer was reported to decrease the viscosity of slurry and dispersing solid particles in slurry and resulted in the increasing of metal extraction.




A series of leaching experiments in sulfuric acid solution using Pioneera L-800 biopolymer were done to study its effect on extraction percentage of nickel and leaching kinetics. The leaching experiments were performed under variations of temperature, sulfuric acid concentration, Pioneera L-800 dosage, and solid percentage. The leaching was done for 12 hours and solution sampling was made after 15, 30, 60, 120, 240, 480, and 720 minutes. Measurements of concentrations of nickel, iron, and dissolved magnesium were performed using Atomic Absorption Spectrophotometer (AAS) to determine extraction percentage and the amount of dissolved oxides. Leaching kinetics was studied by using a shrinking core model to determine rate limiting step and activation energy of the leaching process.




The experimental results show an increase in temperature and acid concentration increasing the percentage of nickel extraction, while the increase of solid percentage tends to lower the percentage of nickel extraction. The use of Pioneera L-800 biopolymer with dosage of 1200 ppm can reduce the viscosity of slurry by 13.6% and increases the percentage of nickel extraction by 10.44% from 84.94% without biopolymer to 93.81% at 6M sulfuric acid concentration and 20% solids percentage. The increase in nickel extraction followed by co-extraction of iron, in which the highest co-dissolved iron percentage of 97.45% was obtained in the addition of Pioneera L-800 of 1200 ppm at 4.5M sulfuric acid concentration and 15% solid percentage. The addition of biopolymer decreases the activation energy of leaching process from 142.41 kJ/mol to 136.61 kJ/mol and accelerates leaching rate. Kinetic analysis shows that leaching of lateritic nickel ore in sulfuric acid solution at the absence and presence of Pioneera L-800 biopolymer is controlled by diffusion through unreacted solid product layer.

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