My understanding is similar to yours in that I think you need to file a patent in each individual country where you want protection. This is APG's current status in Australia:
Production of synthetic rutile by continuous leaching
Austpac Resources NL
2000-12-20
LAPSED
It is also my understanding that it wouldn't be too difficult to 'black box' any required parts (those under patent) of a process such as APG's to avoid IP copying in Australia. That would mean hopefully that an o/s Coy would have to invent/re-engineer those parts of the process covered by patent and black boxed by APG. That might make it uneconomical to proceed atm as opposed to waiting to see what APG came up with, and then make a commercial decision once an APG plant is up and running.
Cargill - who own half of this JV with BlueScope are very interesting