La faisabilité du concept de la recirculation de l’eau de procédé pour résoudre les problèmes de toxicité d’effluent au complexe minier Raglan
Symposium Rouyn-Noranda 2002
The Raglan Mill had been in production for less than a year when the initial toxicity tests on the effluent revealed that it was defined as “toxic” under regulations. Testwork was begun to address the fundamental reasons for the toxicity and a systematic approach was initiated to identify causes. Elimination of the problem presented a challenge once the main conclusion identified high dissolved solids as the principal culprit. In particular, normally benign soda ash (sodium bicarbonate) reagent additions used in milling, was identified as the main contributor to the problem. Following analysis of all requirements and safety considerations, a concept to recycle 100% of the mill process water was pursued. In addition to meeting regulatory requirements, this project would have numerous positive benefits to the operation, including reducing fresh water consumption and lowering costs.