Process for the separation of iron in extraction of titanium in mixed chloride media

摘要

A process for leaching a value metal from a titaniferous ore material comprising the step of leaching the ore material at atmospheric pressure with a lixiviant comprising magnesium chloride and hydrochloric acid is disclosed. Iron and titanium are leached into solution. Iron in the ferric state may be separated from titanium in solution using extraction with alkyl ketone. More effective separation of titanium with lower contamination with iron is obtained.

主权项

1. A process for leaching of titanium from a titaniferous ore material selected from the group consisting of a titanium-bearing ore, concentrate thereof, modified ore thereof and tailings thereof, and mixtures thereof, said process comprising the steps of:
(a) leaching the titanium-bearing ore material at atmospheric pressure with a lixiviant comprising hydrochloric acid and magnesium chloride, said leach being carried out under conditions such that titanium and iron values leached from the titaniferous ore material remain in solution and iron values are converted to ferric iron; (b) subjecting the leach solution so obtained to liquid/solids separation to obtain a leachate and solids; and (c) subjecting the leachate to solvent extraction with a dialkyl ketone, to obtain a solution rich in iron and a raffinate, said raffinate containing titanium values.