INDIA: Gharda Chemicals Plans to Make TiO2 Pigment from Bauxite Processing Waste

摘要

More than 75 million t.p.a. of "red mud" is currently generated worldwide as a waste product (in the form of a sludge containing 50-60% Fe2O3) from the processing of bauxite to alumina. Conventional bauxite-processing plants employ the long-established Bayer process and, depending on the quality of the bauxite and the plant flowsheet, between 1.1 and 6.2 tonnes of "red mud" are generated per tonne of alumina output.