Apparatus and method for controlling mercury pollution from...

B - Operations – Transporting – 01 – D

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B01D 53/64 (2006.01) B01D 53/02 (2006.01)

Patent

CA 2729668

A method ad apparatus for reducing discharges into the atmosphere of mercury pollutants associated with dry process, precalciner cement manufacturing is shown. Raw feed meal used in cement production is heated in a special heating chamber to drive off volatile mercury pollutants, such as elemental mercury and mercury oxides. Preferably, the feed meal is heated to a temperature of at least 175° C. The gases that are driven off flow are then cooled to condense the mercury pollutants causing them to be adsorbed on carbon particles injected into the gas flow. The carbon particles containing the condensed mercury pollutants are then filtered out of gas flow, for example, using a fabric filter. The gas flow may be burned to destroy other volatile pollutants such as hydrocarbons and/or ammonia.

L'invention concerne un appareil et un procédé destinés à réduire les rejets dans latmosphère de polluants mercuriels associés à la fabrication de ciment par voie sèche avec précalcination. Une charge de farine crue utilisée dans la production de ciment est chauffée dans une chambre de chauffe spéciale pour chasser les polluants mercuriels volatils, comme le mercure élément et les oxydes de mercure. De préférence, la farine de charge est chauffée jusquà une température dau moins 175° C. Les gaz chassés sont ensuite refroidis pour condenser les polluants mercuriels, ce qui provoque leur adsorption sur des particules de carbone injectées dans lécoulement de gaz. Les particules de carbone contenant les polluants mercuriels condensés sont alors filtrées pour les retirer de lécoulement de gaz, par exemple à laide dun filtre en tissu. Lécoulement de gaz peut être brûlé pour détruire dautres polluants volatils comme des hydrocarbures et / ou de lammoniac.

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