Abstract
This paper describes two concepts for simultaneous recovery of magnesium and removal of sulphate from mine effluent. Treatment of mixed gypsum sludge generated in sulphate removal by lime precipitation containing roughly 2/3 of gypsum and 1/3 of magnesium hydroxide was treated with CO2 to separate Mg from Ca. Another concept utilizes selective precipitation of Mg before any sulphate removal measures to recover as pure magnesium hydroxide as possible. In terms of Mg recovery, the latter concepts seems more promising, but it has impacts on sulphate removal with regards to increased chemical consumption.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 13th international Mine Water Association Congress |
| Subtitle of host publication | IMWA 2017 |
| Editors | Christian Wolkersdorfer, Lotta Sartz, Mika Sillanpää, Antti Häkkinen |
| Place of Publication | Lappeenranta |
| Publisher | Lappeenranta University of Technology |
| Pages | 55-63 |
| Volume | 1 |
| ISBN (Print) | 978-952-335-065-6 |
| Publication status | Published - 2017 |
| MoE publication type | A4 Article in a conference publication |
| Event | 13th International Mine Water Association Congress, IMWA 2017, Mine Water and Circular Economy - Lappeenranta, Finland Duration: 25 Jun 2017 → 30 Jun 2017 |
Conference
| Conference | 13th International Mine Water Association Congress, IMWA 2017, Mine Water and Circular Economy |
|---|---|
| Abbreviated title | IMWA 2017 |
| Country/Territory | Finland |
| City | Lappeenranta |
| Period | 25/06/17 → 30/06/17 |
Keywords
- sulphate removal
- magnesium
- valorisation
- recovery