关键词: 铁尾矿库, 无土复垦, 尾泥, 土壤化, 种植试验

Abstract: In order to promote the soilless reclamation in the process of closing and selling the iron tailings pond，realize the ecological bulk utilization of tailings mud and reduce the cost of ecological resto⁃ ration，taking the tailings mud of an iron tailings pond as the research object，through the systematic analy⁃ sis of material composition，toxicity leaching，particle size distribution，nutrient composition and heavy metal content，supplemented by the same tailings，inorganic compound fertilizer，organic fertilizer and wa⁃ ter retaining agent，the lemon grass planting experiment was carried out to comprehensively evaluate its soilization feasibility. The results show that the main chemical components of the tailings are silicon，calci⁃ um，iron，etc.，and the main phases are calcite，quartz and hematite，which belong to conventional miner⁃ al composition. The toxic leaching solution meets the first-level discharge standard of GB 8978—1996. The median particle size d50=106.84 μm，which is conducive to the formation of good soil structure and per⁃ meability；the heavy metal content meets the relevant requirements of“Green Planting Soil”and“Construc⁃ tion Land Soil Pollution Risk Screening Value”，which can support high-volume utilization ; the total nitro⁃ gen content reached the standard，but the organic matter，available phosphorus and available potassium were low. The planting experiment showed that the lemon grass grew well after supplementing the nutrient components，which directly verified the feasibility of the soil reconstruction of the tail mud. The research results provide basic data support and scientific basis for soilless reclamation of tailings reservoir.

Key words: iron tailings pond, soilless reclamation, tailings mud, soil formation, planting experiment