Soil passivator for repairing lead-cadmium-arsenic combined pollution and preparation method and application thereof

• Main Authors: ZHAO FEIPING, GONG HANGYUAN, XIE YAN, YANG ZHIHUI, YANG WEICHUN
• Format: Patent
• Language: Chinese; English
• Published: 24.09.2021
• Subjects: ADHESIVES; CHEMISTRY; DISPOSAL OF SOLID WASTE; DYES; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; PERFORMING OPERATIONS; POLISHES; RECLAMATION OF CONTAMINATED SOIL; RECLAMATION OF CONTAMINED SOIL SOIL; TRANSPORTING

The invention provides a preparation method of a soil passivator for repairing lead-cadmium-arsenic combined pollution, which comprises the following steps of: S1, adding a ferric chloride solution into a calcium chloride solution to obtain a first mixed solution, and then adding a diammonium hydrogen phosphate solution into the first mixed solution to obtain a second mixed solution; S2, adjusting the pH (Potential of Hydrogen) of the second mixed solution to 1.5 to 2.3, and then adjusting the second mixed solution to be alkaline, so as to obtain reaction slurry; S3, performing synthesis treatment on the reaction slurry to obtain a synthesized product, the synthesis treatment comprising ultrasonic dispersion and microwave heating synchronously conducted on the reaction slurry; and S4, carrying out solid-liquid separation on the synthesized product to obtain a solid product, and then sequentially cleaning, drying and grinding the solid product to obtain the soil passivator. Lead, cadmium and arsenic in soil ca