Presented paper

Pre-treatment of Coal Dump Leachate With MgO For Pigment Recovery

Letjiane, Leny (1,3); Maree, Johannes Philippus (2,3); Onyango, Maurice (1); Adeniyi, Amos (1)
1: Tshwane University of Technology; 2: University of Limpopo,; 3: ROC Water Technologies

Mine water rich in metals requires sustainable and cost effective treatment that leads to recovery of resources. Consequently, this investigation was aimed at identifying a process for recovering clean water and saleable products such as pigments from iron-rich acid mine water. For this, MgO was used to remove iron as Fe(OH)3, which was converted through drying at 80°C to goethite (yellow) and at 700°C to haematite (red). Na2CO3 was used for removal of the remaining metals (Mn2+ and Ca2+) as carbonates. The pre-treated water is desalinated with RO to produce a permeate (TDS = 105 mg/L) and a brine of 85 069 mg/L. The brine is further concentrated by freeze crystallization up to a TDS of 336 820 mg/L. This is concentrated enough for the recovery of MgSO4.7H2O.

Presenter:
Room:

IMWA2019 Conference

Genkel st. 4, Perm, Russia, 614990

MWA2019 website uses cookies.

We inform you that this site uses own, technical and third parties cookies to make sure our web page is user-friendly and to guarantee a high functionality of the webpage. By continuing to browse this website, you declare to accept the use of cookies. More information

How to delete cookies

© 2018-2019 IMWA2019