KRISTIARDI, RAHMAD (2024) STUDI EFISIENSI PROSES DESORPSI LOGAM BERHARGA PADA SIRKUIT ELUTION DENGAN METODE ANGLO AMERICAN RESEARCH LABORATORY (AARL) DITINJAU DARI KONTRIBUSI PERLAKUAN ACID WASH DAN KONSENTRASI REAKTAN. Other thesis, UPN Veteran Yogyakarta.
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Abstract
v
ABSTRAK
Proses ekstraksi bijih emas PT Meares Soputan Mining dilakukan dengan metode
Carbon in Leach (CIL). Loaded carbon hasil CIL di elusi dengan metode Anglo
American Research Laboratory (AARL). Metode AARL dipilih karena memiliki
beberapa keunggulan yaitu waktu proses lebih pendek, perolehan logam berharga
lebih baik, dan proses dilakukan secara batch sehingga lebih fleksibel. Proses elusi
emas dan perak membutuhkan biaya operasional yang cukup besar terutama pada
penggunaan reagen. Penelitian ini mempelajari efisiensi parameter proses elusi
pada perlakuan acid wash dan konsentrasi reaktan terhadap persentase perolehan
logam berharga, kinetika proses, dan biaya proses. Selain itu juga mempelajari
variasi parameter pada proses elusi terhadap persentase aktivitas, persentase
adsorpsi, dan kapasitas adsorpsi barren carbon dengan uji barren activity test.
Proses elusi dilakukan pada kolom berkapasitas 12 m3 dengan variasi parameter
konsentrasi sianida, natrium hidroksida, dan perlakuan acid wash menggunakan
metode desain faktorial 23. Analisis kadar logam dilakukan dengan Atomic
Absorption Spectrophotometer (AAS) dan pengolahan data menggunakan metode
statistika ANOVA. Desorpsi logam terjadi secara berurutan dari tembaga, perak,
dan emas. Persentase perolehan emas tertinggi dengan pendekatan perhitungan
loaded carbon, larutan hasil elusi, dan stripping karbon adalah sebesar 98,28%;
98,88%; dan 98,80%. Untuk perak sebesar 99,66%; 99,76%; dan 99,75%, serta
tembaga sebesar 95,86%; 98,43%; dan 98,33%. Sedangkan untuk persentase
aktivitas, persentase adsorpsi, dan kapasitas adsorpsi tertinggi adalah sebesar
90,11%; 47,68%; dan 4,83 mg/g. Hasil tersebut pada kondisi percobaan konsentrasi
sianida 2%, natrium hidroksida 1%, dan dengan perlakuan acid wash. Berdasarkan
analisis statistika variasi parameter memberikan pengaruh namun tidak signifikan
terhadap perolehan logam berharga pada proses elusi dan adsorpsi dari barren
carbon. Tembaga mempunyai nilai energi aktivasi paling kecil, kemudian emas dan
perak. Keuntungan terbesar pada skenario konsentrasi sianida 2%, natrium
hidroksida 1,5%, dan tanpa perlakuan acid wash dengan keuntungan sebesar
$544.910,54. Diikuti oleh skenario konsentrasi sianida 1%, natrium hidroksida
1,5%, dan dengan perlakuan acid wash dengan keuntungan sebesar $5442.734,60.
Proses elusi di PT Meares Soputan Mining dapat diefisiensi dalam segi penggunaan
reagen. Skenario yang dapat dipertimbangkan untuk digunakan pada proses elusi
dari segi persentase perolehan emas dan perak, adsorpsi dari barren carbon, dan
segi keekonomian adalah pada konsentrasi sianida 1%, natrium hidroksida 1,5%,
dan dengan perlakuan acid wash.
Kata Kunci : Elusi, Anglo American Research Laboratory (AARL), Reagen Elusi,
Persentase Perolehan, Adsorpsi
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ABSTRACT
The gold ore extraction process at PT Meares Soputan Mining involves using the
Carbon in Leach (CIL) method. The loaded carbon obtained from CIL is subjected
to elution using the Anglo-American Research Laboratory (AARL) method. The
AARL method was selected due to its numerous advantages, including a shorter process
time, better recovery of precious metals, and the ability to be carried out in batches, making
it more flexible. The elution process for gold and silver requires significant
operational costs, particularly in terms of reagent usage. This study focuses on
assessing the efficiency of emulsion process parameters in acid wash treatment and
reactant concentration, with a specific emphasis on their impact on the percentage
of precious metal acquisition, process kinetics, and overall process costs.
Additionally, the study explores the effects of varying parameters in the elution
process on percent activity, percent adsorption, and carbon barren adsorption
capacity through the barren activity test. The elution process was conducted using
a 12 m3 capacity column, with variations in cyanide concentration, sodium
hydroxide, and acid wash treatment, employing the 23 factorial design method. The
metal content analysis was performed using Atomic Absorption Spectrophotometer
(AAS), and the data was processed using the ANOVA statistical method. Metal
desorption occurred sequentially, starting with copper, followed by silver, and then
gold. The approach involving the calculation of loaded carbon, elution solution,
and carbon stripping yielded the highest percentages of gold at 98.28%, 98.88%,
and 98.80%, silver at 99.66%, 99.76%, and 99.75%, and copper at 95.86%,
98.43%, and 98.33%. The percentage of activity, percent of adsorption, and highest
adsorption capacity were 90.11%, 47.68%, and 4.83 mg/g, respectively. These
results were obtained under experimental conditions of 2% cyanide concentration,
1% sodium hydroxide, and acid wash treatment. Based on the statistical analysis,
the variation of parameters has an influence but is not significant on the acquisition
of precious metals in the elution and adsorption process from barren carbon.
According to the kinetic analysis, copper has the smallest activation energy value.
The greatest benefit is in the skenario with 2% cyanide concentration, 1.5% sodium
hydroxide, and without acid wash treatment, with a profit of $544,910.54. This is
followed by the skenario with 1% cyanide concentration, 1.5% sodium hydroxide,
and with acid wash treatment, with a profit of $544,734.60. The elution process at
PT Meares Soputan Mining can be efficient in terms of reagent usage. The skenario
to be considered for use in the elution process in terms of percentage of gold and
silver recovery, adsorption from barren carbon, and economic aspects is at a
cyanide concentration of 1%, sodium hydroxide of 1.5%, and with acid wash
treatment.
Keyword : Elution, AngloAmerican Research Laboratory (AARL), Reagent elution,
Acid wash, Percent Recovery, Adsorption
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Elution, AngloAmerican Research Laboratory (AARL), Reagent elution, Acid wash, Percent Recovery, Adsorption |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Eko Yuli |
| Date Deposited: | 22 Oct 2024 08:29 |
| Last Modified: | 22 Oct 2024 08:29 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/41444 |
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