Treatment System and Method for Ex-situ Carbonization and Solidification of Silt Soil Using Active Magnesium Oxide

摘要

A method for an ex-situ carbonization and solidification of silt soil using an active magnesium oxide, pertaining to the field of civil and hydraulic engineering. The method includes the steps of silt pretreatment, homomixing of solidifying agents, silt granulation, carbonization by carbon dioxide, exhaust gas/waste liquid collection, and resource utilization. In the method, the supply amount of the solidifying agent is adjusted through the actual measurement of the moisture content, and the granule size and carbon dioxide pressure are adjusted according to the soil properties. Therefore, a full mixing of the silt with the solidifying agents and a rapid carbonization of the magnesium oxide solidified silt granules can be achieved. Moreover, the dust and carbon dioxide can be absorbed during the operation, thereby avoiding secondary pollution. The silt carbonized granules can be used as filling materials for roadbeds, airport runways, engineering backfills, etc.