Prarancangan Pabrik Smelter Grade Alumina Refinery Dengan Bahan Baku Bauksit Dan Natrium Hidroksida Melalui Proses Bayer Dengan Kapasitas 1.000.000 Ton/Tahun

Abstract

Indonesia is one of the countries with the largest bauxite reserves in the world, yet most of it is still exported in raw form. To support the government's downstream mineral program and reduce dependency on imported alumina, a preliminary design study of a Smelter Grade Alumina (SGA) plant using the Bayer process was conducted. This study aims to produce high-quality alumina from local bauxite ore and evaluate the technical and economic feasibility of the plant establishment. The plant is designed with a production capacity of 1,000,000 tons per year, using bauxite and sodium hydroxide (NaOH) as the main raw materials. The production process includes four main stages: grinding, digestion, precipitation, and calcination. The final product is alumina (Al₂O₃) with a purity of 98.98%. Economic analysis results show that the total investment required is IDR 5,243,941,979,617, with an estimated annual net profit after tax of IDR 1,112,021,550,997. The Break Even Point (BEP) is achieved at 30.55% production capacity, the Return on Investment (ROI) is 20.94%, the Internal Rate of Return (IRR) is 22.49%, and the Pay Out Time (POT) is 11 years and 4 months. Based on these indicators, the project is declared technically and economically feasible and has strategic potential to support national downstream initiatives and job creation