绿色矿冶

The mining process of ionic rare earth mines has undergone many improvements. The combination of magnesium sulfate leaching, magnesium oxide enrichment and sodium salt precipitation can better meet the needs of the market, but the effect of sodium ions on soil and vegetation is still unclear. According to the sodium sulfate concentration used in the actual mining of the mine, this paper took typical plants and soil as the research object, and simulated the influence of sodium sulfate concentration on plants and soil in the leaching process through seed germination, planting experiment and soil column experiment. The results of seed germination and planting experiments show that when the concentration of sodium sulfate is not higher than 0.5%, the seed germination rate, bud length, root length and biomass of typical plants, as well as the number of plants, plant height, leaf fresh weight and dry weight of plants, are less affected and within an acceptable range. The results of soil column experiments show that sodium sulfate has little effect on soil pH at the experimental concentration. The content of SSC and sodium ions increase significantly with the increase of sodium sulfate concentration, and the content of SSC and sodium ions decrease significantly after washing with clear water, and the washing effect is obvious. The results of soil ESP and EC are lower than the critical value of sodium soil, and decrease significantly after washing with clear water. The above results show that the entry of sodium ions into the mountain will have a certain impact on the soil environment. After the mining is completed, clean water leaching can effectively reduce its impact on the soil environment.