Magnetite Ore BeneficiaУргамлын хүдэр боловсруулалт. bayer alumina үйлдвэрлэлийн үйл явц The Bayer process is the principal industrial means of refining bauxite to produce alumina aluminium oxide and was developed by Carl Josef Bayer Bauxite the most important ore of aluminium contains only 30–60 aluminium oxide Al 2 O 3 the rest being a