4 results about "Phosphogypsum" patented technology

The invention discloses a modified phosphogypsum highway subgrade filler and a preparation method thereof. The method comprises the following steps: aging phosphogypsum for more than 5 days to obtain a material A; calcining the material A at 160-200 DEG C for 1.5-2.5 hours to obtain a material B, and naturally cooling the material B; uniformly mixing 91-93 wt% of the material A and 7-9 wt% of the material B to obtain a material C; and adding water, which accounts for 12-16 wt% of the material C, into the material C, and stirring uniformly to obtain the modified phosphogypsum highway subgrade filler. The phosphogypsum is calcined at controlled temperature for controlled time according to the chemical characteristics of the calcined phosphogypsum to obtain the modifier, thereby enhancing the gelation property in the phosphogypsum, improving the stability and water resistance of the internal structure and obtaining the subgrade filler satisfying the highway engineering requirements. The modified phosphogypsum highway subgrade filler effectively solves the problem that the existing phosphogypsum is restricted to the local doping materials and is low in consumption.

The invention relates to the technical field of construction and building materials, in particular to photocatalytic concrete prepared with a phosphogypsum-based hydraulic composite binding material and a preparation method of the photocatalytic concrete. The photocatalytic concrete is prepared from phosphogypsum, slag powder, limestone powder, portland cement, broken glass slag, wind-blown sands,a foamer, a foam stabilizer, a water reducer and a photocatalytic organic adhesive. The photocatalytic concrete provided by the invention can be used to improve the indoor air pollution problem, particularly perform adsorption and degradation on harmful gas including formaldehyde, the improvement can be finished under the condition of natural illumination without more energies and operation steps, and the photocatalytic concrete has market value. The photocatalytic concrete is suitable for the field of indoor decorative materials including light wall body materials, gypsum wall body articlesand ceiling decorative plates.

The invention discloses a composite solid waste pavement base binder and a preparation method thereof, and belongs to the technical field of road engineering. The composite solid waste pavement base binder is prepared by mixing pretreated alkaline ardealite powder, fly ash, slag powder and cement. The industrial waste phosphogypsum slurry raw material is subjected to alkaline pretreatment to obtain the alkaline phosphogypsum powder, the alkaline phosphogypsum powder is mixed with the solid waste such as the fly ash and the slag and the cement, and the mixture is applied to a semi-rigid base material to be used as a gelling binder, so that an effective utilization way of the industrial waste residue material is provided, and the utilization rate of the industrial waste residue material is increased. Moreover, the resource utilization rate of industrial waste residue materials can be increased, and the problem of environmental pollution caused by stockpiling and discharging of industrial waste residues is solved. And the prepared pavement base binder can improve the strength of the pavement base, reduce the shrinkage cracking effect of the pavement base, reduce the cement consumption, reduce the cost, and achieve the purposes of recycling solid wastes, and being economical and environment-friendly.