Production of synthetic rutile

摘要

The specification describes a process for producing synthetic rutile from a titaniferous ore or concentrate. The process involves three basic steps which are reduction, removal of iron by leaching or aeration and removal of other impurities by leaching in a solution of a strong mineral acid such as hydrochloric acid or sulphuric acid. The conditions of reduction are controlled to promote the formation of metallic iron, a major rutile phase and a minor impurity-bearing phase. The minor impurity-bearing phase may be a metatinatate, an anosovite or a pseudobrookite. However, formation of a metatinatate is normally preferred. Suitable reductants include carbonaceous materials or hydrogen bearing gases such as natural gas or synthetic gas. The process is capable of removing more than 80% of each of the contained iron, magnesium and manganese remaining as oxides after reduction. Substantial proportions of contained aluminium can also be removed.