PT. Antam UBPE Pongkor menggunakan sianida untuk ekstraksi emas-perak sehingga menghasilkan limbah berupa tailing yang masih mengandung sianida cukup tinggi sehingga perlu didegradasi dalam tangki detoksifikasi. Pada penelitian ini dilakukan recovery sianida pada tailing underflow thickener menggunakan metode Hannah dengan tiga proses utama yaitu adsorpsi, elusi, dan absorpsi. Tujuan dilakukan percobaan ini untuk mengetahui kapasitas maksimum resin, konsentrasi optimum HCl dalam proses elusi, NaOH dalam proses absorpsi dan persentase recovery sianida. Penentuan kapasitas maksimum resin dengan variasi dosis resin yaitu 0 g/L, 10 g/L, 20 g/L, 40 g/L, dan 50 g/L, dilakukan sampling setiap 1 jam sekali selama 6 jam. Konsentrasi HCl dan NaOH optimum dalam proses elusi-absorpsi ditentukan dari persen recovery sianida tertinggi. Variasi HCl yaitu 0,2 N; 0,5 N, dan 0,8 N dan variasi NaOH yaitu 0,5 N; 1N; dan 1,5 N. Dari hasil penelitian didapatkan kapasitas maksimum resin purolite A500/2788 yaitu 151,52 mg CN/g resin, Konsentrasi optimum HCl 0,2 N dan NaOH 1,5 N dan persentase recovery sianida 88%. Kata kunci: Adsorpsi, Absorpsi, Elusi, Hannah Process, Recovery Sianida, Resin.

PT. Antam UBPE Pongkor use cyanide to extract gold-silver thus produce tailing . contained high concentration of cyanide should be degradation on detoxification tank. In this research cyanide recovered by taling underflow thickener using Hannah method with three process namely adsorption, elution, and absorption. The purposes of this research is to obtain resin maximum capacity, optimum concentration of HCl in elution process, NaOH in absorption process, and the percentage of cyanide recovery. Resin dose is varied at 0 g/L, 10 g/L, 20 g/L, 40 g/L and 50 g/L to know resin maximum capacity, while sampling time at once every hour for six hours. The optimal concentration of HCl and NaOH of elution-absorption process is determined from the higest of percent cyanide recovery. Concentration of HCl is vary from 0,2 N; 0,5 N; and 0,8 N and concentration of NaOH is vary from of 0,5 N; 1 N; and 1,5 N. This study obtained resin purolite A500/2788 maximum capacity is 142,857 gram CN/L, optimum concentration of HCl is 0,2 N, optimum concentration of NaOH is 0,5 N with percent recovery cyanide of 88%. Keywords: Adsorption, Absorption, Cyanide Recovery, Elution, Hannah Process, Resin.

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