There is no scanner support for this model on any version of OS X. If you had an " i " model, that is an iR2018i, then you would have a push scan function in the copier and could use this to send a document from the iR to a folder on the Mac using the FTP protocol.
Sorry if I have confused you. Canon makes two versions of the iR2018. There is the iR2018 which has no send function. And there is the iR2018i which has a send function. So if your model is an iR2018i, then you can push scan a document to the shared folder on the Mac. So before I give you information on how to configure push scanning, can you confirm if you have an iR2018i. Note the letter i after the number. If you have an iR2018, without the letter i after the 8, then this model does not have the send function so you will not be able to push scan to the Mac.
I resolved my problem with ir2018 in 1/2 - installed Virtual Box with Windows and installed iR2018, but I have only WinXP (legal). If you have it too, you should get drivers for UR II LT for Windows (no for PCL 6 or 5e). Programe for scanner: Paper Scan (others, which I found doesn't saw scanner).
I hope my idea help you resolve your problem, and I hope Canon help us (in the end!) to work with iR2018 (it isn't so young, but its good hardware - why they made so good machine, if they doesn't let us to work with this ?).