Method and metal casting case for reducing pollutant...

B - Operations – Transporting – 22 – C

Patent

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Details

B22C 1/00 (2006.01) B22C 1/02 (2006.01) B22C 9/02 (2006.01) B22C 9/12 (2006.01) B22D 45/00 (2006.01)

Patent

CA 2456936

The invention relates to a method for reducing pollutant emissions, released particularly in the form of pyrolysis products from metal casting cases, used in foundry practices. The aim of the invention is to reduce said emissions at low cost. This aim is achieved, whereby at least one additional combustible substance is added to the metal casting cases. Said substance changes into gaseous form on heating, provided that it is not gaseous, and burns together with the pollutants when leaving the metal casting cases. The additional combustible substance contains at least one organic substance, preferably a wax or an oil, ideally a ketone, an aldehyde, ether or alcohol. It can also be advantageously formed by a combustible gas (natural gas).

L'invention concerne un procédé permettant de réduire des émissions de polluants, libérées de récipients de moulage, utilisés en fonderie, en particulier sous forme de produits de pyrolyse. L'objectif de cette invention est de réduire ces émissions de façon simple et économique. A cet effet, au moins une substance combustible supplémentaire est ajoutée aux récipients de moulage. Cette substance passe à l'état gazeux sous l'effet de la chaleur, dans la mesure où elle n'est pas gazeuse, et brûle avec les polluants en sortant desdits récipients. Cette substance combustible supplémentaire contient au moins une substance organique, de préférence une cire ou une huile, idéalement une cétone, un aldéhyde, un éther ou un alcool. Cette substance peut également être formée, de façon avantageuse, par un gaz combustible (gaz naturel).

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