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摘要
In order to solve the problem of large-scale safe disposal of bauxite residue and dehydrated mineral slime, the Bayer method dealkalized bauxite residue and dehydrated mineral slime were taken as the research object, and bio-organic fertilizer and planting of sticktights were applied. The physical and chemical indexes and mineral phase changes of loam soils were analyzed, and the effects of bio-organic fertilizer and planting sticktights on the loam ecological restoration of bauxite residue and dehydrated mineral slime were explored. The results showed that physicochemical properties of loam soils were improved with the increase of the proportion of bio-organic fertilizer application, and the growth of sticktights was more vigorous. Among them, the average length of sticktights was 87.0 cm and the average number of leaves was 257 in loam soils with 3% bio-organic fertilizer, the pH and electrical conductivity decreased to 7.87 and 429.01 μS·cm?1. The results of Pearson correlation analysis showed that increasing organic matter played a positive role in the restoration of loam ecology. After 60 days of treatments, 1.5% bio-organic fertilizer was applied, the mass fraction of alkaline chemical combination alkali and Na decreased, and large aggregates were formed. The results of this study can provide a reference for the ecological restoration of bauxite residue and dehydrated mineral slime. ? 2023 Science Press.
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