Mufakhir, Fika Rofiek
Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

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Benefisiasi Bijih Emas dan Perak Kadar Rendah Menggunakan Palong dan Metode Flotasi Astuti, Widi; Isnugroho, Kusno; Mufakhir, Fika Rofiek; Herlina, Ulin; Nurjanah, Isti
Jurnal Rekayasa Proses Vol 12, No 2 (2018)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (424.13 KB) | DOI: 10.22146/jrekpros.35483

Abstract

A B S T R A C TBeneficiation of low-grade gold and silver ores were investigated by gravity concentration flotation methods. The ores were obtained from Way Kanan Region and Mount Burhan in Province of Lampung. In this study, gravity concentration in sluice box and flotation were performed in sequence. Effect of particle size was investigated in gravity concentration by sluice box. Furthermore, effect of various parameters in flotation operation such as concentration of collector, ore particle size, and processing time were studied. Gravity concentration in sluice box indicated that the highest recovery of gold and silver were 76.52% and 94.83%, respectively when using ore particle size of 100+150 mesh. Flotation experiments showed that the maximum recoveries of gold and silver obtained were 98.33% and 86.42%. The conditions to obtain maximum recovery in this study were -100+150 mesh of ores particle size, 25 mL/kg concentration of collector, and 25 minutes of processing time.Keywords: beneficiation; flotation, gold ore; silver ore; sluice box.A B S T R A KBenefisiasi bijih emas dan perak kadar rendah menggunakan konsentrasi gravitasi dengan palong dan menggunakan flotasi telah dilakukan. Bijih emas dan perak yang digunakan berasal dari daerah Way Kanan dan Gunung Burhan di Provinsi Lampung. Pada penelitian ini, konsentrasi gravitasi dengan palong dilakukan terlebih dahulu sebelum dilakukan benefisiasi menggunakan flotasi. Pengaruh ukuran partikel dipelajari pada konsentrasi gravitasi dengan palong. Sedangkan pengaruh beberapa variabel seperti konsentrasikolektor, ukuran partikel, dan waktu flotasi dipelajari dalam proses benefisiasi menggunakan flotasi. Pada konsentrasi gravitasi dengan palong, hasil percobaan menunjukkan bahwa persen recovery emas dan perak tertinggi secara berturut-turut adalah 76,52% dan 94,83% ketika digunakan ukuran partikel -100+150 mesh. Pada proses flotasi, hasil percobaan menunjukkan bahwa persen recoveryemas dan perak maksimum yang diperoleh adalah 98,33% dan 86,42% ketika digunakan ukuran partikel -100+150 mesh, konsentrasi kolektor 25 mL/kg dan waktu flotasi 25 menit.Kata kunci: benefisiasi; emas; flotasi; palong; perak
CHARACTERIZATION AND PROSPECTIVE PROCESS OF MANGANESE ORE OF TANGGAMUS AND WAY KANAN REGENCY LAMPUNG PROVINCE Mufakhir, Fika Rofiek; Sumardi, Slamet
Teknologi Indonesia Vol 37, No 1 (2014)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.051 KB) | DOI: 10.14203/jti.v37i1.216

Abstract

Manganese (Mn) has a very important role in various industrial fields such as iron, steel, food, agriculture and chemical industry. High grade Mn ore(>40%) are generally processed through the pyrometallurgy process, whereas for low grade Mn ore (<40%) is processed through the hydrometallurgical treatment process. This study aims to characterize the Mnore in Tanggamus and Way Kanan Regency Lampung Province and prospective process. Experiment begins with a sampling of the area in Tanggamus and Way Kanan mine. Sample preparation is then performed by reducing the particle size of the ore through the stages of crushing, grinding and particle size distribution. Mn ore sample which has been reduced then performed characterization using X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM). The results showed that the characteristics of Mn ore in Tanggamus and Way Kanan mine was different. Mn ore Tanggamus have the highest contentof 33.84% Mn associated with Fe2O3 minerals, while Mn ore Way Kanan had content 18.03% associated with SiO2 minerals. Both Mn ore are included in low grade Mn ore (<40). Prospective processing of manganese ore is initiated by benefitiation and proceed by leaching method.
STUDI KINETIKA PELINDIAN BIJIH MANGAN KADAR RENDAH DAERAH WAY KANAN LAMPUNG DENGAN MENGGUNAKAN MOLASES DALAM SUASANA ASAM Sumardi, Slamet; Mufakhir, Fika Rofiek; Prasetyo, Agus Budi
Metalurgi Vol 29, No 2 (2014): Metalurgi Vol.29 No.2 Agustus 2014
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (485.099 KB) | DOI: 10.14203/metalurgi.v29i2.282

Abstract

STUDI KINETIKA PELINDIAN BIJIH MANGAN KADAR RENDAH DAERAH WAY KANANLAMPUNG DENGAN MENGGUNAKAN MOLASES DALAM SUASANA ASAM. Telah dilakukanpercobaan pelindian bijih mangan kadar rendah daerah Way Kanan Lampung dengan menggunakan molaseshasil limbah pabrik tebu dalam suasana asam sulfat. Percobaan ini dilakukan untuk mempelajari pengendali lajuproses dalam pelindian bijih mangan, nilai-nilai konstanta laju reaksi dan/atau konstanta difusi serta energiaktivasinya. Pelindian dilakukan dengan kondisi percobaan yang tetap untuk persen solid padatan 10%,kecepatan pengadukan 300 rpm, dosis pemberian molases sebanyak 80 g/L sedangkan suhu dan konsentrasiyang divariasikan. Studi kinetika diasumsikan dengan pendekatan Shrinking Core Model (SCM). Pelindian bijihmangan kadar rendah daerah Way Kanan Lampung dapat dilakukan dengan menggunakan molases sebagaipereduksi dan dalam medium asam sulfat. Hasil penelitian terhadap kinetika pelindian mangan denganmenggunakan molases sebagai agen pereduksi menunjukkan bahwa tahap pengendali laju pelindian adalah difusiproduk reaksi melalui inti yang tidak bereaksi dengan energi aktivasi sebesar 3,73 kkal/mol.
Pelarutan Emas pada Pelindian Konsentrat Emas Hasil Roasting Menggunakan Reagen Tiosianat Mufakhir, Fika Rofiek; Sinaga, J M; Oediyani, Soesaptri; Astuti, Widi
Jurnal Rekayasa Proses Vol 13, No 1 (2019)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (266.236 KB) | DOI: 10.22146/jrekpros.41519

Abstract

A B S T R A C TDissolution of gold from roasting concentrate of gold ore using potassium thiocyanate with the presence of ferric chloride as an oxidizer was investigated. The concentrate was taken from Lengkukai gold mine. Gold ore particles under 53 µm in size were roasted at varied temperature, separated using wet magnetic separator, and finally leached. The X-ray diffraction (XRD) analysis showed that there were phase changes after roasting with the emergence of new phases such as hematite, pyrrhotite, and almandine. Leaching of gold concentrate after roasting and magnetic separation showed that gold was in non-magnetic concentrate at 950oC with the highest gold dissolution of 0.95 mg/L, while magnet concentrate was completely absent. Experiments with the addition of Fe3+ ion oxidizers for 24-hour range did not have significant effect on gold dissolution. The highest gold concentration obtained of 2.29 mg/L was obtained at 12 hours with 0.1 M FeCl3. The increase of thiocyanate reagent concentrations, which showed a linear correlation to gold dissolution, produced up to 2.25 mg/L of gold concentration (12 hours at 0.3 M KSCN).Keywords: ferric ion gold dissolution; gold concentrate; roasting; thiocyanate A B S T R A KPelarutan emas dari konsentrat hasil roasting bijih emas tambang Lengkukai menggunakan reagen pelindi kalium tiosianat dengan penambahan ferric chloride sebagai oksidator telah diteliti. Partikel bijih emas dengan ukuran di bawah 53 µm di-roasting pada berbagai temperatur kemudian dipisahkan menggunakan pemisah magnetik basah dan akhirnya dilindi. Hasil analisis X-ray diffraction (XRD) menunjukkan adanya perubahan fase setelah roasting dengan munculnya fase-fase baru yaitu hematit, pirohitit dan almandin. Pelindian konsentrat emas hasil roasting dan pemisahan magnetik menunjukan emas berada pada konsentrat non magnet temperatur roasting 950 oC dengan pelarutan emas paling tinggi sebesar 0,95 mg/L, berbeda dengan konsentrat magnet yang sama sekali tidak ada. Percobaan dengan penambahan oksidator ion Fe3+ selama rentang 24 jam tidak memberikan efek yang signifikan terhadap pelarutan emas. Dari penelitian ini didapatkan konsentrasi emas tertinggi sebesar 2,29 mg/L pada 12 jam dengan konsentrasi FeCl3 0,1 M. Sedangkan penambahan konsentrasi reagen tiosianat, yang menunjukan hubungan linier terhadap pelarutan emas, menghasilkan konsentrasi besar hingga 2,25 mg/L selama 12 jam pada konsentrasi KSCN 0,3 M.Kata kunci: ion besi III; konsentrat emas; pelarutan emas; roasting; tiosianat