Process for decontaminating preservative-treated wood and...

Details Process for decontaminating preservative-treated wood and... Process for decontaminating preservative-treated wood and...

B - Operations, Transporting

27

K

B27K 5/00 (2006.01) A62D 3/30 (2007.01) C02F 1/42 (2006.01) C02F 1/52 (2006.01) C02F 1/58 (2006.01) C22B 3/42 (2006.01) C22B 3/46 (2006.01) C22B 15/00 (2006.01)

Patent

CA 2720630

Described is a process for decontaminating wood treated with preservative such as chromium copper arsenate (CCA) including contacting the contaminated wood with water and inorganic acid at a concentration between 0.05 and 0.8 N at less than 100 °C to leach out the contaminants and then separate the wood from the solution. Also described is a process for extracting metals such as copper from a solution containing chromium, copper and arsenic, such as the leachate solution used to decontaminate CCA-treated wood, by precipitation using a coagulant at a pH favoring precipitation of arsenic and continued solubility of copper, or by ion exchange resins.

Linvention concerne un procédé permettant la décontamination dun bois traité avec un agent conservateur tel que larsenate de cuivre et de chrome (ACC) qui inclut la mise en contact du bois contaminé avec de leau et un acide inorganique à une concentration comprise entre 0,05 N et 0,8 N à moins de 100°C pour lixivier les contaminants et ensuite séparer le bois de la solution. Linvention concerne également un procédé permettant dextraire des métaux tels que le cuivre dune solution contenant du chrome, du cuivre et de larsenic, tel que la solution de lixiviat est utilisée pour décontaminer le bois traité par lACC, par précipitation en utilisant un coagulant à un pH favorisant la précipitation de larsenic et la solubilité continue du cuivre, ou au moyen de résines échangeuses dions.

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