bergo, Port Lincoln is not a container port and never will be - thus that answers your question - a container ship will not call there.
a container port needs infrastructure [say usd100m] and a steady volume of containers in and out [say 400 per week in and out] to justify a call.
there is no container infrastructure at Port Lincoln and there is no steady inbound volume of freight.
IMO graphite in any refined form will not be shipped from Port Lincoln.
maybe if a graphite company digs it up and stockpiles 20,000t of ROM then it would warrant a bulk ship calling and off it goes to a cheap processing place like say China. 20,000t @ [lets be generous] 12% graphite and there is 2,400t of graphite. dig it up and ship it out mentality and let someone else have the value add.
meanwhile said graphite company has no cash flow while they dig up 20,000t of ROM.
you have mentioned VXL - did you notice the truck taking the bulka bags was curtin sided?
this truck surely brought in a load of consumables for Port Lincoln and the bulka bags was a backload - if the graphite was not ready then the truck would go back empty to Adelaide
there is no justification to send a truck empty from Adelaide to Port Lincoln to bring back a load of Graphite
