China Nonferrous Metallurgy

To explore the problem of large-scale and harmless disposal of the redmudandmineral mud, the study of in-situ ecological reclamation of alkali-control red mud and dewatered ore mud soiled mine pits was carried out by using the synergism of sludge and five kinds of plants cooperation.The findings demonstrated that the sludge and five kinds of plants cooperation could significantly lower the salt alkalinity of the red mud andmineral mud matrix and improve nutrients, enzyme activity, and microbial diversity of the red mudandmineral mud red mineral mud matrix used for soil chemical disposal. Among these, the pH and total salt levels were decreased to 8.50 and 1.50g·kg^-1, respectively, meeting the technical specifications for mine ecological environmental protection and restoration management. In accordance with the second national soil census criteria, the levels of organic matter, total nitrogen, and total phosphorus in plants‘ first growth season met the tertiary criterion. After sludge application, the greatest alkaline phosphatase and urease activity in the redmudand mineral mud matrix were 0.17mg·g-12h^-1 and 2.05mg·g^-124h^-1, respectively. It offered a fresh concept for soil formation and large-scale ecological treatment of redmudandmineral mud.