title: Regeneration of barium carbonate from barium sulphide in a pilot-scale bubbling column reactor and utilization for acid mine drainage.
abstract: Batch regeneration of barium carbonate (BaCO(3)) from barium sulphide (BaS) slurries by passing CO(2) gas into a pilot-scale bubbling column reactor under ambient conditions was used to assess the technical feasibility of BaCO(3) recovery in the Alkali Barium Calcium (ABC) desalination process and its use for sulphate removal from high sulphate Acid Mine Drainage (AMD). The effect of key process parameters, such as BaS slurry concentration and CO(2) flow rate on the carbonation, as well as the extent of sulphate removal from AMD using the recovered BaCO(3) were investigated. It was observed that the carbonation reaction rate for BaCO(3) regeneration in a bubbling column reactor significantly increased with increase in carbon dioxide (CO(2)) flow rate whereas the BaS slurry content within the range 5-10% slurry content did not significantly affect the carbonation rate. The CO(2) flow rate also had an impact on the BaCO(3) morphology. The BaCO(3) recovered from the pilot-scale bubbling column reactor demonstrated effective sulphate removal ability during AMD treatment compared with commercial BaCO(3).
authors.affiliation: Council for Scientific and Industrial Research, Natural Resources and the Environment, Pretoria, Gauteng, South Africa. jmulopo@csir.co.za
authors.forename: J
authors.initials: J
authors.lastname: Mulopo
authors.forename: J N
authors.initials: JN
authors.lastname: Zvimba
authors.forename: H
authors.initials: H
authors.lastname: Swanepoel
authors.forename: L T
authors.initials: LT
authors.lastname: Bologo
authors.forename: J
authors.initials: J
authors.lastname: Maree
mesh_terms: D001464:Barium / Q000737:chemistry*; D017609:Barium Compounds / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry*; D002254:Carbonates / Q000737:chemistry*; D003032:Coal Mining; D007220:Industrial Waste; D010865:Pilot Projects; D013431:Sulfates / Q000737:chemistry; D013440:Sulfides / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D017609:Barium Compounds; D002254:Carbonates; D007220:Industrial Waste; D013431:Sulfates; D013440:Sulfides; D002245:Carbon Dioxide; D001464:Barium; C006685:barium carbonate; C039592:barium sulfide