TY - JOUR AU - Germishuizen, C AU - Franzsen, S AU - Grobler, H AU - Simate, GS AU - Sheridan, CM PY - 2018/01/31 Y2 - 2024/03/29 TI - Case study modelling for an ettringite treatment process JF - Water SA JA - WSA VL - 44 IS - 1 January SE - Research paper DO - 10.4314/wsa.v44i1.10 UR - https://watersa.net/article/view/6494 SP - AB - <p>Several technologies have been developed to treat acid mine drainage (AMD) and attention is shifting towards the removal&nbsp;of sulphate. The formation of ettringite, a hydrous calcium aluminium sulphate mineral, is an option to treat AMD and can&nbsp;reduce the sulphate concentration to well below the discharge specifications. The process modelled in this study includes the&nbsp;formation of ettringite and the recovery of gibbsite through the decomposition of recycled ettringite. The modelling of this&nbsp;process was done using PHREEQC and the results presented in this paper are based on the outcome of different case studies&nbsp;that investigated how the process is affected by a change in parameters. These include, changing the feed water pH, altering&nbsp;the split fractions in the hydrocyclone for the gibbsite recovery and varying the pH for ettringite formation.</p> ER -