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All Journal Equilibrium Journal of Chemical Engineering Indonesian Mining Journal
Haq, Shofa Rijalul
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Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Environmental Science Materials Science & Nanotechnology

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PERBANDINGAN HASIL ANALISIS POLA ALIRAN DENGAN PERSAMAAN RANS DAN LES DALAM COMPUTATIONAL FLUID DYNAMICS (CFD): LITERATURE RIVIEW Thiansy, Elsy; Cahyadi, Tedy Agung; Haq, Shofa Rijalul
Indonesian Mining Journal Vol 28 No 2 (2025): Indonesian Mining Journal, October 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol28.No2.2025.1664

Abstract

The settling pond functions to hold and settle suspended particles, especially Total Suspended Solid (TSS) in order to reduce the pollutant load. However, the effectiveness of settling ponds is greatly influenced by the flow characteristics and the concentration of tss carried. This research compares two numerical approaches in Computational Fluid Dynamics (CFD), namely Reynolds-Averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES). Both of these methods are widely used in turbulent flow simulations, but have different approaches and levels of accuracy in representing turbulence structures. This study reviews various recent scientific publications that apply the rans and les equations in internal and external flow cases, including settling pond applications. The review results show that the RANS equation is suitable for large-scale engineering simulations with low computational requirements but is less accurate in capturing turbulence details. The les equation provides more accurate results in capturing turbulent flow patterns than the RANS model. However, tutoring models require greater computational resources, so they need to be considered for more complex applications. From this comparison it can be concluded that the selection of equations in a CFD is very dependent on the analysis objectives, limited computing resources, and the level of data detail required.
Study of The Effect of Temperature On The Desorption Efficiency of Precious Metals In The Elution Process Using Anglo American Research Laboratories (AARL) Method G.F., Frideni Yushandiana Putri; Mawarda', Mei Iftita; -, Sulaeman -; Mirahati, Riria Zendy; Haq, Shofa Rijalul
Equilibrium Journal of Chemical Engineering Vol 8, No 2 (2024): Volume 8, No 2 December 2024
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v8i2.89289

Abstract

The elution process, known as the desorption of gold from carbon into solution, uses high temperature and pressure. Activated carbon is used as an adsorbent in the precious metal adsorption process. PT Indo Muro Kencana uses the Anglo American Research Laboratories (AARL) method to desorb valuable metals from the activated carbon of the Carbon In Pulp (CIP) process. The elution process of this research involves 9 stages: Pre-heat, Pre-soak 1, Pre-soak Circulation, Lean 1, Presoak 2, Lean 2, Water Elution 1, Water Elution 2, and Cooling. This study found that copper (Cu) metal desorbed from carbon first, followed by silver (Ag) metal, with the desorption of gold (Au) metal occurring last due to the influence of the stability value of metal cyanide complexes. High cyanide concentrations (~ 10% CN-) were given in Pre-soak 1, Pre-soak Circulation, and Pre-soak 2. The elution process is significantly affected by high process temperatures, particularly 123°C in the Lean 2 stage, which effectively desorbs gold (Au) at its optimal point. The solution product that only contains copper from the initial 60 minutes of the Pre-heat and Pre-soak 1 processes was transferred to the tailings tank to improve the efficiency of the refining process. The total recoveries for gold (Au), silver (Ag), and copper (Cu) were 93.1%, 95%, and 94.7%, respectively.
Co-Authors -, Sulaeman - Cahyadi, Tedy Agung G.F., Frideni Yushandiana Putri Mawarda', Mei Iftita Mirahati, Riria Zendy Thiansy, Elsy