Wahyuningsih, Tri and Sanwani, Edy and Chaerun, Siti Khadijah (2017) BIOFLOTASI BIJIH TEMBAGA : KADAR MENINGKAT TANPA REAGEN KIMIA (APLIKASI BAKTERI MIXOTROF PENGOKSIDASI SULFUR). In: Seminar Nasional Kebumian XII Fakultas Teknologi Mineral UPN “Veteran” Yogyakarta, 14 September 2017, Yogyakarta.

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Flotation is one of concentration method for sulphide ore processing which utilizes the difference in the mineral surface characteristic by means of chemical reagent addition. However, the reagent addition in flotation process can cause environmen tal problems. Therefore, it is very critical to develop a method to replace the chemical reagent with more ecofriendly substances. In this study, the application of microbe to substitute chemical reagent for bioreagent in flotation process was investigated by using mixotroph bacterium which that capable of producing biosurfactant and oxidizing sulfur. In this study the copper sulphide bioflotation experiment used a pyritic copper sulphide ore. The laboratorium scale bioflotation experiment was conducted in a Denver flotation cell with pH operating parameters (2,3,6) and conditioning time 60 minutes. The copper sulphide bioflotation experiment was conducted at a particle size fraction - 200+325 mesh ( - 74+44 μm), 25% solid percentage (w/v) and initial feed grad e of 4.96% Cu and 28.93% Fe. The results showed that optimum condition was achieved at pH 3. The experiment conducted at this ideal condition yielded concentrate with 95.92% recovery, 9.26% Cu, and 27.03% Fe as well as tailing with 0.52% Cu, 39.38% Fe, and selectivity index of 5.08 (selectivity of chalcopyrite concentrate separation). From these results, it can be concluded that bacteria is effective substitute as ecofriendly biofrother and biocollector for chemical reagents. Keywords - bioflotation, bioreagent, grade, recovery, biosurfactant Ringkasan Salah satu proses konsentrasi pada pengolahan bijih tembaga sulfida adalah dengan teknik flotasi yang memanfaatkan perbedaan sifat permukaan mineral dengan menambahkan reagen kimia. Penambahan reagen kimia pada froses flotasi dapat menimbulkan permasalahan lingkungan. Oleh karenanya perlu upaya-upaya untuk menggantikan reagen kimia dengan bahan yang lebih ramah lingkungan. Dalam penelitian ini, dilakukan upaya untuk menggantikan peran reagen kimia dengan mikroba sebagai bioreagen. Percobaan bioflotasi dalam skala laboratorium dilakukan dengan menggunakan sel flotasi Denver dengan jenis bakteri mixotrof pengoksidasi sulfur dilakukan pada tingkat keasaman yang berbeda (pH 2,3 dan 6) dan conditioning time 1 jam. Percobaan bioflotasi mineral tembaga sulfida yang dilakukan pada fraksi ukuran -200+325 mesh (-74+44 μm) dan persen solid 25% (w/v) dengan kadar umpan awal 4,96% Cu dan 28,93% Fe, diperoleh hasil yang optimum pada kondisi pH 3, konsentrasi bakteri 9,1 x 1012 cfu/ml. Pada kondisi optimum tersebut dihasilkan konsentrat recovery Cu 95,92%, dengan kadar 9,26% Cu dan 27,03% Fe. Tailing yang dihasilkan mempunyai kadar 0,52% Cu dan 39,38% Fe. Nilai selectivity index 5,08 (selektif memisahkan konsentrat kalkopirit). Hasil peningkatan kadar pada konsentrat ini mengindikasikan bahwa bakteri mixotrof pengoksidasi sulfur ini mampu menghasilkan biosurfaktan yang menggantikan reagen kimia sebagai biofrother dan biocollector yang lebih ramah lingkungan. Kata Kunci - bioflotasi, bioreagen, kadar, recovery, biosurfaktan

Item Type: Conference or Workshop Item (Paper)
Subjects: T Technology > TN Mining engineering. Metallurgy
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: ST, MT Tri Wahyuningsih
Date Deposited: 15 Aug 2018 01:37
Last Modified: 15 Aug 2018 01:42

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