Laonu, Moh. Rafi Akbar and Setiafindari, Widya (2025) ANALISIS PENGENDALIAN KUALITAS PADA PRODUK PLS UNTUK MENURUNKAN JUMLAH PRODUK CACAT DENGAN METODE SIX SIGMA (STUDI KASUS : PT QMB NEW ENERGY MATERIALS). Tugas Akhir thesis, University of Technology Yogyakarta.
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5210611048 MOH. RAFI AKBAR LAONU_ABSTRAK.pdf Download (222kB) |
Abstract
Abstrak Pregnant Leach Solution (PLS) merupakan produk hasil proses High Pressure Acid Leaching (HPAL) yang mengandung nikel terlarut, namun juga berpotensi mengandung kadar besi (Fe) berlebih yang dapat mengganggu proses pemurnian nikel. Penelitian ini bertujuan untuk mengidentifikasi penyebab cacat pada PLS, menghitung level sigma perusahaan, dan memberikan usulan perbaikan kualitas menggunakan pendekatan Six Sigma dan Failure Mode and Effect Analysis (FMEA). Penelitian dilakukan di PT QMB dengan menggunakan 11 sampel PLS, di mana 72% di antaranya memiliki kadar Fe melebihi standar perusahaan (<40%). Tahapan Six Sigma yang digunakan meliputi Define, Measure, Analyze, dan Improve. Hasil pengolahan data menunjukkan nilai rata-rata DPMO sebesar 389.691 dan level sigma sebesar 1,78, yang mencerminkan rendahnya kapabilitas proses. Analisis menggunakan diagram Pareto dan fishbone mengidentifikasi faktor manusia, metode, material, lingkungan, dan mesin sebagai penyebab utama cacat. Berdasarkan perhitungan RPN, faktor kelelahan operator memiliki nilai tertinggi yaitu 384. Rekomendasi perbaikan mencakup pengaturan ulang jam kerja, pengendalian dosis asam sulfat, serta inspeksi rutin pada alat produksi. Diharapkan hasil penelitian ini dapat membantu perusahaan dalam meningkatkan kualitas produk PLS secara berkelanjutan. Kata kunci: Six Sigma, FMEA, PLS, Kualitas, HPAL, Fe. Abstract Pregnant Leach Solution (PLS) is a product of the High Pressure Acid Leaching (HPAL) process that contains dissolved nickel, but also potentially contains excessive levels of iron (Fe) that can interfere with the nickel refining process. This study aims to identify the causes of defects in PLS, calculate the company's sigma level, and provide quality improvement recommendations using the Six Sigma and Failure Mode and Effect Analysis (FMEA) approaches. The study was conducted at PT QMB using 11 PLS samples, of which 72% had Fe levels exceeding the company's standards (<40%). The Six Sigma stages used include Define, Measure, Analyze, and Improve. The results of data processing showed an average DPMO value of 389,691 and a sigma level of 1.78, which reflects low process capability. Analysis using Pareto and fishbone diagrams identified human, method, material, environmental, and machine factors as the main causes of defects. Based on the RPN calculation, operator fatigue had the highest value of 384. Recommendations for improvement include rearranging work hours, controlling sulfuric acid dosage, and routine inspections of production equipment. It is hoped that the results of this study will assist companies in sustainably improving the quality of PLS products. Keywords: Six Sigma, FMEA, PLS, Quality, HPAL, Fe.
| Item Type: | Thesis (Skripsi, Tugas Akhir or Kerja Praktek) (Tugas Akhir) |
|---|---|
| Subjects: | T Technology > TS Manufactures |
| Divisions: | Fakultas Sains dan Teknologi > S1 Teknik Industri |
| Depositing User: | Kaprodi S1 Teknik Industri UTY |
| Date Deposited: | 19 Dec 2025 05:13 |
| Last Modified: | 19 Dec 2025 05:13 |
| URI: | http://eprints.uty.ac.id/id/eprint/19554 |
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