method of continuous acid treatment of the raw clays and shales

摘要

A process for the continuous treatment of alumino-ferrous ore of the clay or schist type for recovery of alumina, iron, magnesium and alkali metals, including the steps of attacking the crude ore with hot, concentrated sulphuric acid, precipitating the aluminum with HCl in the form of hydrated chloride, and precipitating the iron and the potassium in the form of a double sulphate after oxidation of the iron from its divalent state by injection of chlorine into the sulphuric solution before recycling.