Mercury adsorbents compatible as cement additives

Details Mercury adsorbents compatible as cement additives Mercury adsorbents compatible as cement additives

B - Operations, Transporting

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D

B01D 53/02 (2006.01) B01D 53/64 (2006.01) B01J 20/04 (2006.01) B01J 20/10 (2006.01) B01J 20/20 (2006.01) B01J 20/32 (2006.01) C04B 18/08 (2006.01)

Patent

CA 2671956

Solid adsorbents, following their use for mercury removal from flue gas, that do not interfere with the ability of air-entraining additives (such as surfactants) to form stable bubbles when added to fly ash containing the adsorbents. The interference is overcome by heating the materials used in the manufacture of the adsorbent so that magnesium hydroxide and/or one or more alkali compounds containing one or more silicate, aluminate, and/or phosphate moiety, added or already present in the materials, binds multivalent cations present in the materials that could otherwise interfere with the surfactant activity.

L'invention concerne les adsorbants solides qui, après leur utilisation pour éliminer du mercure de gaz de carneau, n'interfèrent pas avec la capacité de former des bulles stables présentée par des additifs entraîneurs d'air (tels que des agents tensioactifs) lorsqu'on les ajoutés à de la cendre volante contenant les adsorbants. Pour éliminer cette interférence, on chauffe les matériaux utilisés dans la fabrication de l'adsorbant de sorte que de l'hydroxyde de magnésium et/ou un ou plusieurs composés alcalins contenant une ou plusieurs fractions silicate, aluminate et/ou phosphate, ajoutés ou déjà présents dans les matériaux, se lient aux cations multivalents présents dans les matériaux qui, sans cela, pourraient interférer avec l'activité tensioactive.

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