A method for the prevention and control of ionic rare earth shallow groundwater pollution

Abstract

The invention discloses a method for preventing and controlling ionic rare earth shallow groundwater pollution. Aiming at the common geological characteristics of shallow buried and broken bedrock of ionic rare earth mines in my country, the following measures are taken: building a horizontal anti-seepage curtain in the deep bedrock fracture zone of the mining area , build a vertical anti-seepage curtain in the shallow bedrock fracture zone at the edge of the mining area to prevent the migration and diffusion of leachate; install self-controlled extraction wells in the water-rich area inside the anti-seepage curtain to control the shallow groundwater level in the mining area and avoid overflow Pollution; set up water quality monitoring wells around the anti-seepage curtain to monitor the concentration of groundwater leaching agents and guide the control of shallow groundwater levels in the mining area; clean with clean water and low-concentration calcium hydroxide solution at the end of mining. Through the above measures, the impact of in-situ leaching mining on the surface / groundwater environment of the mining area can be effectively controlled, and the loss of rare earth resources in the mining process can be reduced. The invention is suitable for ion-type rare earth mines with shallow buried and broken bedrock, and can assist in the construction of ecological mines, digital mines and intelligent mines.

Description

technical field [0001] The invention belongs to the technical field of in-situ leaching and mining of ionic rare earths, and in particular relates to a method for preventing and controlling pollution of shallow groundwater during in-situ leaching and mining of ionic rare earths. Background technique [0002] Ionic rare earths were first discovered and named in my country in 1969. They are rare earth deposits mainly composed of heavy rare earth elements and are an important part of global rare earth resources. According to the survey, in 2015, the world's proven heavy rare earth reserves were about 544,200 tons, of which China's heavy rare earth reserves were about 220,000 tons, accounting for 40.4%, and the remaining resources were mainly distributed in the United States, Australia and India. Ionic rare earths are widely distributed in South China, where rare earth ions are adsorbed in the form of ions on clay minerals such as kaolin, montmorillonite, and illite, and can be ...

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