Process for reducing the iron content of aluminate liquors in the Bayer process.

摘要

The iron content of the aluminate liquor process stream as part of the Bayer process of preparing alumina from bauxite is reduced by contacting said stream with a tertiary hydroxyl-containing polyamine. The polyamine is preferentially added between the digestion step and the filtration step to the settler overflow. Generally the polyamine is produced from a monoalkylamine or monoalkanol amine and an epihalohydrin and optionally an alkylene diamine or ammonia.