Long way to go to promote new energy vehicles, rare earth pollution into a new exam

Rare is called "industrial vitamins' extensive use in military, electronics and other industries, is an important strategic mineral resources. As the rare earth mining operation is simple, low cost, resulting in excessive exploitation of rare earth enterprises, indiscriminate deforestation seriously, with backward production technology, inadequate facilities and lack of environmental management and ecological restoration of environmental protection facilities, water and soil caused a very major environmental pollution.

During the extraction of rare earths, rare earth on the one hand the formation of sulfuric acid and ammonium hydroxide in the soil, and then after precipitation of oxalic acid or ammonium bicarbonate, ammonium bicarbonate or rare earth oxalate into a rare earth, which is substantially completed from mining to Take mine the whole process is left in the soil sulfate and ammonium ion - the main component of fertilizer, but if the concentration is too high, the plant's roots will be burned. On the other hand, the remaining tailings still contain many heavy metals, along with erosion into surface and groundwater, seriously affecting the drinking water sources of local residents and agricultural irrigation water.

According to the environmental protection department estimates, the rare earth industry each year produces tailings amounted to thousands of tons of pollutants which have exceeded ten times the national emission standards.

According to the topography factor contaminated areas (ground slope, soil thickness, soil material composition, irrigation), soil physical properties (density, dispersion coefficient, the initial infiltration rate, porosity), soil chemical properties (pH, water-soluble calcium content, NPK content), biological factors (activity, total microbial respiration) and other indicators to determine the main limiting factor affecting soil remediation and restoration of vegetation in the area. Combined with local climatic conditions and domestic and foreign soil remediation of pollution control technology and other relevant information to determine the content of the works and the general idea.

First, select Survey conducted soil pollution monitoring, and land formation on the basis of the monitoring results of the investigation on the one hand, to select a different method of heavy metal enrichment plant species and soil heavy metal pollution control to carry out the work, on the other hand to select different soil remediation agents Governance restoration of contaminated soils. Implementation steps are divided into: the status of soil survey, soil sampling and analysis, soil environmental assessment, restoration design, restoration program implementation.

In recent years, concerns about soil pollution prevention rare earth mine continues to heat up, some of the first real efforts have been made to the region. National ministries are actively filling policy gaps, technology, policies and regulations, a number of pollution prevention and control, is expected to be introduced in the near future. We can say that the rare earth mine soil remediation will face challenges and better opportunities for development.


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