Prarancangan Pabrik Alumina Refinery dari Bauksit Melalui Pemisahan Awal Menggunakan NaOH dan CaCO3 Pada Digester Bertekanan Kapasitas 1.500.000 Ton/Tahun

Abstract

The preliminary design of the alumina refinery plant from bauxite is carried out through an initial separation process using NaOH and CaCO₃ in a pressurized digester with a production capacity of 1,500,000 tons/year, operating for 330 days per year. The main processes in the preliminary plant design consist of four stages, namely comminution, digestion, crystallization, and calcination. The addition of CaCO₃ is intended to reduce the silica content in the product. The required amount of bauxite to achieve the annual production capacity is 248,092.942 kg/hour. The planned plant location is in Balai Belungai, Sanggau Regency, West Kalimantan, with a total required land area of 25,652 m². The proposed company form is a Limited Liability Company (PT) with a line and staff organizational structure, employing a total of 200 personnel. The results of the economic analysis of this preliminary plant design are as follows: • Capital Investment (CI) = Rp 711.723.916.617,- • Total Cost (TC) = Rp 11.107.918.867.529,- • Profit Margin (PM) = 15,964% • Break Even Point (BEP) = 41,333% • Return On Investment (ROI) = 19,426% • Pay Out Time (POT) = 5 years 2 months • Return On Network (RON) = 32,377% • Internal Rate of Return (IRR) = 29,073% Based on the results of the economic analysis, it can be concluded that the “Alumina Refinery Production Plant” is feasible to be established.

Keywords: Alumina Refinery, Bauxite, Digester Reactor, Rotary Kiln