Acidic-wastewater treating material and method of treating...

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 1/66 (2006.01) C02F 1/52 (2006.01) C02F 1/64 (2006.01)

Patent

CA 2471512

This invention relates to a method for treating acidic waste water, particularly mine effluent, and to a solid waste water treating material useful for the method. This waste water treating material is obtained by solidifying a mixture of rock wool and an inorganic binder mainly containing at least one kind selected from silicates, hydroxides and oxides of alkaline earth metals and alkali metals and has a porosity of 50% or more. When brought into contact with acidic waste water containing iron ions and sulfate ions, this waste treating material can not only neutralize the waste water but also remove harmful heavy metals such as iron and arsenic. Furthermore, it is easy to dispose the spent waste water treating material.

L'invention concerne un procédé pour le traitement d'eaux usées acides contenant des ions sulfate et des ions fer, notamment d'eaux usées provenant d'une fosse. L'invention concerne également une substance solide pour le traitement des eaux usées utilisée dans le procédé de l'invention. On obtient la substance de traitement des eaux usées, qui a une teneur en vide de 50 % ou plus, en solidifiant un mélange de laine de roche avec un liant non organique comprenant, comme constituants principaux, un ou plusieurs des silicates, hydroxydes et oxydes alcalino-terreux et alcalins. Lorsque cette substance de traitement des eaux usées est mise en contact avec des eaux usées acides contenant des ions fer ou des ions sulfate, non seulement les eaux usées peuvent être neutralisées, mais le fer et des métaux lourds nocifs, tel l'arsenic, peuvent également être éliminés. La substance de traitement des eaux usées peut être facilement traitée après utilisation.

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