Method for preparing roadbed water stabilizing layer from solid waste phosphogypsum, aluminum ash and steel slag

• Main Authors: LU YI, WANG XIN, QING SANCHENG, PAN SHEWEI, WU MENG, WAN YONGBO, QU YINGFENG, LI QIANG, WANG YONGGUANG, XUE GUANGHAI
• Format: Patent
• Language: Chinese; English
• Published: 14.05.2024
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; LIME, MAGNESIA; METALLURGY; REFRACTORIES; SLAG; TREATMENT OF NATURAL STONE

The invention discloses a method for preparing a roadbed water-stable layer from solid waste phosphogypsum, aluminum ash and steel slag, which comprises the following steps: mixing fine powder formed by grinding and modifying phosphogypsum modified by vacuum heating, aluminum ash modified by high-temperature calcination and steel slag with cement to form a solid waste-based composite cementing material; and mixing with mixed aggregate formed in a specific steel slag-gravel particle size range and proportion to prepare the roadbed water-stable layer. The method has the advantages that soluble HPO4 < 2->, H2PO4 <-> and F <-> in the phosphogypsum and Al, AlN, NaCl and KF in the aluminum ash can be effectively removed or separated, the environmental pollution risk and the hydration negative effect are eliminated, and the use of cement and natural gravel can be reduced on a large scale; synergistic resource utilization of the steel slag, the aluminum ash and the ardealite in the roadbed water-stable layer is achie