RE:Ioneer Signs LOI with Shell for 250,000 tonnes of SulfurFrom our PEA
17.8.1 Acid Plant The sulfuric acid plant envisioned for this project is Double Contact Double Absorption (DCDA) sulfur burning acid plant with an energy recovery system. The plant is capable of producing 2,000 tonnes per day of sulfuric acid (100% purity basis) by combusting elemental sulfur. The sulfur is designed to be delivered in the molten state by trucks.
The acid plant combusts elemental sulfur to produce sulfur dioxide gas, the gas is converted to the sulfur trioxide through catalysis and reacted with water to form concentrated sulfuric acid. The combustion of the sulfur produces significant heat that can be captured in a boiler to produce steam and electricity. The use of a backpressure turbine system optimizes the production of electricity and steam for the process. The acid plant has the ability to produce up to 25 MW of electricity but at additional capital expense so at this stage only enough electricity will be generated to allow the acid plant to be electrically self-sufficient.
Spent gas from the acid plant is piped to carbonate scrubbing where residual sulfur dioxide and acid mist are removed to less than US EPA Prevention of Significant Deterioration (PSD) emission limits before the gas is discharged to the atmosphere.