Method for quickly desalting dredgerfill by using desulfurization gypsum (DSG)

Abstract

The invention discloses a method for quickly desalting dredgerfill by using desulfurization gypsum (DSG). The method comprises that: when the water content of the dredgerfill reaches about 10 percent,adding desulfurization gypsum which is a product of the flue gas desulfurization of a coal fired power plant in 30 to 40 centimeter soil body in an amount which is 5 to 10 percent of the mass of soil, and fully mixing the desulfurization gypsum and the dredgerfill; paving a spray-insulating layer in an required depth of 1.0 to 1.2 meters; flooding for salt-leaching, wherein the amount of the flooding water is 1.0 to 1.2m<3> / m<2>, and the flooding is performed fractionally; and discharging leached salt and reducing salt till a standard for planting soil is met. The method realizes the in-situutilization and direct greening of the dredgerfill, solves the problem of the tense situation of soil and promotes the greening development of dredgerfill areas. The main ingredient of a calcium conditioner for increasing the breathability and loading capacity of the dredgerfill, namely the desulfurization gypsum which is the product of the flue gas desulfurization of the coal fired power plant, is CaSO4.2H2O. After being mixed with the desulfurization gypsum, the dredgerfill is improved in mechanical component and water and air permeability, so the dredgerfill can be quickly dewatered and desalted, and the secondary basification in the desalting process is inhibited.

Description

technical field

[0001] The invention relates to a method for rapidly desalting dredger fill, in particular to a method for rapidly desalting dredge fill by using desulfurization gypsum (DSG). Background technique

[0002] Sea silt soil is the land formed by consolidation and dehydration after dredging land reclamation. It is called dredger fill in harbor engineering, and it belongs to the offshore sediments of water and soil erosion in the upper reaches of rivers. Possess some basic properties of soil, such as colloid, adsorption, substitution, etc. The dredger fill belongs to the type of marine sediment parent material, and has not yet undergone soil-forming processes such as physical weathering, chemical weathering, and biological weathering. The mechanical composition is mostly silt (sand) and clay, and the soil has no structure, hard when dry, and muddy when wet. The soluble salt content is extremely high, generally 1.5% to 2.5%, and sodium and chloride ions occupy an a...

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