Al(OH)_3-Ca(OH)_2 系固化剤による掘削廃泥水の急速固化

概要

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A new setting agent consisting of almorphous aluminum hydroxide and calcium hydroxide was developed for the rapid solidification of waste drilling mud that arises in work sites such as those for civil engineering and construction. The model mud containing 50mass% of water, which was prepared using weathered granite (Masa soil) and bentonite, hardened within 10 minutes by the addition of the setting agent and with the aid of compressive forming mechanics. The water in the mud was mainly incorporated as essential water of calciulm aluminate hydrate minerals such as 3CaO Al_2O_3 6H_2O and 4CaO Al_2O_3 13H_2O with some CO^<2->_3 and 3CaO Al_2O_3 CaCO_3 12H_2O, which crystallized in a very short time. Part of the water was trapped in the gel structure formed in the first stage. The resulting briquette was of manageable strength. The aluminum hydroxide that was recovered from industrial waste solution was applied effectively as an important component of the setting agent, and is favorable for use in the treatment of waste materials because of its reasonable cost.
日本粘土学会の論文
2000-11-30