Bauxite residue (BR) is a by-product of Bayer process used for alumina production. Due to its inherent alkalinity and sodicity physicochemical properties, BR use is globally limited to 2-3% of the 150 million tons (Mt) annually produced. Maximizing alternative and large-scale BR uses is a game changer to make aluminum chain more sustainable, by reduction of its ecological footprint and general costs, and contributing with the Sustainable Development Goals (SDGs) agenda. In 2019, Norsk Hydro Brazil and SENAI Innovation Institute for Mineral Technologies (ISI-TM) launched the project “Bayer Process Towards the Circular Economy – Metal Recovery and Soil Conditioners from Bauxite Residue”, with the aim to develop new technologies for BR valorization. One of this initiative was the development of a soil conditioner formulation composed by BR and palm oil residual biomass that can be future applied for tropical weathered soils fertility increment. Here we evaluate the BR (25%, 50% and 75%) batch composting with raw palm oil mill waste (POMW) and palm oil compost (POC). The pH, EC, total N and organic carbon, C:N ratio, water holding capacity (WHC), cation exchange capacity (CEC), granulometry and elemental composition were determined after 90 days composting. Organic matter composting reduced BR alkalinity and sodicity, increasing CEC, moisture, organic carbon and total nitrogen. The formulation containing 25% of BR and 75% POC showed WHC ≥60% and CEC ≥200 mmolc.kg-1, attending current Brazilian legislation for soil conditioners production and commercialization.