Gas-phase modification in earth materials

专利名称：Gas-phase modification in earth materials发明人：JOSEPH G. HARRINGTON申请号：AU1468100申请日：19991104公开号：AU1468100A公开日：20000529

摘要：A process for treating earth materials such as rock heaps to prevent acid rockdrainage therefrom is disclosed. First, the oxygen concentration in the gas-phase of therock heap is decreased, that is, displaced and/or depleted. This first step may beaccomplished physically, chemically or biologically. Then, the gas-phase oxygen

concentration in the heap is maintained at a low level. This second step may be providedfor in a self-sustaining manner, like, for example, by covering the rock heap with soil andvegetation so that acid rock drainage is prevented indefinitely. Alternatively, the densityof the gas-phase of the rock heap may be increased, and maintained at an elevated levelindefinitely. The process is applicable to waste heaps from mining and industrial

operations such as power generation and minerals processing, and to rubble collectionsin open and closed mines.

申请人：JOSEPH G. HARRINGTON

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