Sorry, but you're just incorrect. Just like other metals, there are minerals which are difficult to process and others that are easy. In this case, Anatase, is difficult to digest and remove the Iron.
https://www.mdpi.com/2673-6489/4/1/6 The processing of anatase ores by sulphuric acid digestion is well known for its low titanium dissolution yields, which makes the process economically and technically unfeasible. Anatase is considered much less reactive than other forms of titanium such as ilmenite and rutile.
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