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This is an essay in the field of mining environmental engineering. In order to evaluate the influence of economic plant planting in the mining area on the rhizosphere soil biological community characteristics and physicochemical properties, 7 typical forest medicine economic plants such as Fallopiamultiflora, Puerarialobata, and 7 typical forest grasses such as Perennial ryegrassand Pennisetum were selected. Taking economic plants as the research object, the experiment of planting potted economic plants under forest was carried out. By measuring plant height, leaf area, aboveground/underground biomass and soil total phosphorus, total potassium, total nitrogen, available nitrogen, available phosphorus, organic matter, cation exchange capacity, and microbial community composition, richness, diversity and other indicators, To comprehensively study the effects of economic plant planting under forest on the characteristics and physicochemical properties of rhizosphere soil. The results showed that planting Chinese herbal plants would increase microbial diversity, while planting forages would have a certain impact on the composition of microbial communities; planting Chinese herbal understory economic plants had a significant improvement in soil fertility, and the most obvious difference was the control. The total nitrogen, alkali-hydrolyzed nitrogen, and organic matter in the group increased by 300.0%, 118.5%, and 825.3%, respectively; planting forages had no obvious effect on soil fertility. The research in this paper shows that planting understory economic plants will have a certain impact on the soil biome and improve soil fertility to a certain extent.

This is an essay in the field of metallurgical engineering. The ion-type rare earth ore in Ganzhou was treated as the research object. Continuous stirring leaching and column leaching were used to study the leaching of rare earth and impurity elements in ore samples. The test results provide a reference for the green and efficient mining of ion-type rare earth mineral resources. The test results show that the rare earth leaching rate is about 80% in the continuous stirring leaching process. The TREO/Al in the secondary leaching solution increases significantly, while the TREO/Ca decreases significantly and the TREO/Mg decreases slightly. With the increase of ore depth, the pH value of leachate gradually increased, TREO/Al increased to 15.52, and TREO/Ca decreased to 0.64. The leaching rate of rare earths all reached more than 96%, but with the increase of depth, the proportion of light rare earth increased from 49.43% to 53.28%, and the proportion of heavy rare earth gradually decreased from 35.91% to 32.18%. The continuous stirring leaching and column leaching tests both show that with the increase of the depth of the ore sample, the leaching rate of rare earth does not decrease significantly, and the leaching of rare earth in low-grade ore seams is still feasible.

In order to find out the soil quality of the undeveloped ion adsorption type rare earth ore, and more purposeful monitoring in the mining process, a mining area in Ningdu, southern Jiangxi was taken as the research area, and the improved Nemerow soil fertility comprehensive method was used to evaluate the soil fertility of the research area, the single factor index method and Nemerow pollution index method were used to evaluate the heavy metal pollution status. Results show that: the soil fertility levels of each single item in the study area are is total phosphorus < total nitrogen < organic matter < available phosphorus < alkaline hydrolyzable nitrogen < available potassium < total potassium, and the overall level is low and barren, which is better than that of a mining waste area; The pollution levels of heavy metals are As

The current mining mode of rare earth mines in southern China is still the in-situ leaching mode. For this mining mode, the fractured structures, underground rivers, karst and other unfavorable geological bodies developed underground in the mine will seriously reduce the recovery rate of the leaching liquid. The leaching liquid leaking along the bad geological bodies will cause serious pollution to the environment, so it is of great significance to investigate the development status of the bad underground geological bodies in the mine. Based on the stratum distribution and structural characteristics of the C2 mining area of a rare earth mine in the south, this article first carried out high-density electrical method parameter experiments, selected appropriate measurement parameters and the Wenner-Schlumberg 2 device measurement mode, and completed the high-density of 4 survey lines Electrical measurement; the hidden electrical structure model of the study area is obtained through inversion calculation, the thickness of the weathered layer (stratum rich in rare earth minerals) and the spatial distribution characteristics of the hidden fault structure are delineated, the results are interpreted and the drilling of the study area layout The results are consistent. The exploration results provide important reference materials for the reserve evaluation of ionic rare earth ore, the plugging of seepage channels, and the layout of liquid collection roadways.