Experimental Study of Magnetic Biochar Combined with Phytoremediation of Copper Sulphide Mine Tailings

In the process of copper sulfide mining, a large number of copper tailings are produced, which can be used as guest soil for mine ecological reclamation through improvement and restoration. In this study, a combination of experimental study, numerical calculation and theoretical analysis is proposed to use the biochar and vegetation to artificially and positively regulate the harsh environment of copper tailings. Through the material migration and transformation between tailings and vegetation, the long-term mechanism of fixation and migration of heavy metal Cu in tailing sand is realized. The results show that: The addition of different biochar has obvious effect on the content of effective potassium in tailings, and the content of magnetic biochar and ryegrass group is as high as 37.77 mg/kg. The copper enrichment capacity of ryegrass showed a greater advantage, the root content was 661.08~902.63 mg/kg, and the plant enrichment coefficient was 1.55~1.83, which was far higher than that of Sudan grass. An improved method that has a better effect on the improvement of suitable plants on sulfurized copper tailings and is conducive to the enrichment and transport of heavy metals by plants is obtained, which not only effectively reduces the content of heavy metal copper in the tailings, but also solves the huge demand for plant growth substrates in mine ecological reclamation.