CEMENTING AGENT FOR SOLIDIFYING HEAVY METAL IONS IN TAILINGS AND USE METHOD THEREOF

Disclosed are a gelling agent for curing heavy metal ions in tailings and a use method thereof. The gelling agent comprises the following raw materials in mass percent: 0.25-0.7% of a chelating trapping agent, 0.15-0.3% of a chelating accelerant, 0.2-0.6% of a complexing early strength agent, 1-7% of lime, 0-10% of cement, 8-20% of gypsum, 0-20% of steel slag micro powder, and 50-82% of mineral slag micro powder. The chelating trapping agent, the chelating accelerant and the complexing early strength agent are mixed well first, and then mixed with other components uniformly. The gelling agent prepared in the present invention can be used for not only cementing total tailings by means of hydration to achieve filling mining, but also synergistically curing heavy metal ions in the tailings by means of leaching, chelating, wrapping, chemical adsorption, chemical passivation, ion substitution and the like to maintain the curing stability for a long time. The gelling agent is particularly suitable for cemented filling of total tailings having high heavy metal ion content, and significantly reduces the environmental risk of high content of heavy metal ions in the filling body after tailings filling.