Process for treating polluted soils by means of a sulfoaluminate clinker based hydraulic binder and use thereof for stabilizing polluted soils
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United States of America Patent
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Jun 13, 2017
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May 14, 2015
app pub date -
May 13, 2013
filing date -
May 14, 2012
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Abstract
A process for treating polluted soils, in particular soils with a leachable fraction greater than 0.4%, wherein the leachable fraction contains predominantly anions, in particular sulfate ions, and/or heavy metals, includes mixing the soil with a sulfoaluminate-clinker-based hydraulic binder, in soil/binder weight proportions of between 1 and 40 parts of binder per 100 parts of soil, the sulfoaluminate clinker containing more than 50% by weight of ye'elimite C4A3S phase, less than 15% by weight of belite C2S phase, and from 1% to 5% by weight of free lime CaO. The process is used for stabilizing soils in situ or before dumping, soils polluted in particular with sulfate anions and/or heavy metal cations.
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