Gas-phase modification in earth materials

B - Operations – Transporting – 09 – B

Patent

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B09B 1/00 (2006.01) B09B 3/00 (2006.01)

Patent

CA 2348510

A process for treating earth materials such as rock heaps to prevent acid rock drainage therefrom is disclosed. First, the oxygen concentration in the gas-phase of the rock heap (40) is decreased, that is, displaced and/or depleted. This first step may be accomplished physically, chemically or biologically. Then, the gas-phase oxygen concentration in the heap (40) is maintained at a low level. This second step may be provided for in a self-sustaining manner, like, for example, by covering the rock heap (40) with soil and vegetation so that acid rock drainage is prevented indefinitely. Alternatively, the density of the gas- phase of the rock heap (40) may be increased, and maintained at an elevated level indefinitely. The process is applicable to waste heaps from mining and industrial operations such as power generation and minerals processing, and to rubble collections in open and closed mines.

L'invention concerne un processus pour traiter des matières de la terres telles que des amas de roches afin de prévenir l'exhaure de formations rocheuses acides. On réduit d'abord la concentration de l'oxygène en phase gazeuse dans l'amas de roches (40), ce dernier étant ensuite déplacé et/ou appauvri. Cette opération peut se faire par procédé chimique, physique ou biologique. Au stade suivant, on maintient la concentration de l'oxygène en phase gazeuse dans l'amas de roches (40) à un faible niveau. On peut assurer le découlement autonome de cette opération, par exemple, en recouvrant l'amas de roches (40) avec de la terre et de la végétation, ce qui permet de prévenir l'exhaure de formations rocheuses acides pendant un temps indéterminé. En variante, on peut augmenter la densité de la phase gazeuse de l'amas de roches (40) et la maintenir à un niveau élevé pendant un temps indéterminé. Le procédé de l'invention peut s'appliquer à des amas importants provenant d'activités minières ou industrielles telles que la génération d'énergie électrique ou les opérations de minéralurgie et aux amas de pierres de carrière provenant de mines à la surface ou en profondeur.

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