Phosphogypsum decomposition process
AssigneeOcp SA
InventorsDriss Dhiba, Lhoussaine Omari, Jamal Chaouki, Ahmad Mohaddespour
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process for decomposing calcium sulfate (CaSO4) present in phosphogypsum (PG), comprising the following steps: a) providing a reactor containing phosphogypsum (PG) and a solid source of carbon (C), b) reacting a flow of dioxygen (Oz) with the source of carbon (C) so as to generate carbon oxide (CO), c) reacting carbon oxide (CO) obtained in step a) with calcium sulfate (CaSO4) of the phosphogypsum to produce calcium oxide (CaO) and sulfoxide (SO2) according to the following reaction: CaSO4+CO→CaO+SO2+CO2 wherein the mass ratio C/PG is between 0.2 and DA, and the mass ratio 15 O2/PG is between 0.5 and 1.5.
Claims9
A process for decomposing calcium sulfate (CaSO4) present in phosphogypsum (PG), comprising the following steps:
- a) providing a reactor containing phosphogypsum (PG) and a solid source of carbon (C),
- b) reacting a flow of dioxygen (O2) with the source of carbon (C) so as to generate carbon monoxide (CO),
- c) reacting carbon monoxide (CO) obtained in step b) with calcium sulfate (CaSO4) of the phosphogypsum to produce calcium oxide (CaO) and sulfur dioxide (SO2) according to the following reaction:
- CaSO4+CO→CaO+SO2+CO2
- wherein the mass ratio C/PG is between 0.2 and 0.4, and the mass ratio O2/PG is between 0.5 and 1.5.
Dependencies are inferred from the claim text.