The seven-year term loan would attract a moratorium of five years, according to facility terms read out during the signing.
Cairo-based Africa’s trade bank also signed a $750 million facility with Nigeria’s development bank, the Bank of Industry.
Dangote built his fortune on cement and now has interests in flour milling, agriculture and real estate.
The world’s biggest oil refinery
He is building the world’s largest single oil refinery and also expanding into fertiliser, aiming to address long-standing problems in Nigeria’s energy markets.
The refinery and petrochemical complex is located on 25,000 hectares of swampy land with a jetty to ferry products by sea within Nigeria and abroad including an undersea pipeline to transport gas.
It would account for half of Dangote’s sprawling assets when it is finished next year.
Dangote intends to process different grades of crude to meet local demand for refined petroleum products and also target export markets abroad.