Lounge access is detailed at
https://www.oneworld.com/ffp/lounge-access
Originally Posted by OneWorld
Emirates Business Lounge
Location details: Terminal 3, Concourse A, level U4
Opening hours: Daily: 24hrs
Notes: Available to Emerald and Sapphire Members when their next onward flight is Qantas operated and marketed
For DXB-SIN, since the flight is operated by EK, then no access entitlement to the EK lounge