Ion type rare earth shallow groundwater pollution prevention and control method

Abstract

The invention discloses an ion type rare earth shallow groundwater pollution prevention and control method. According to the general geological feature that the bed rock of an ion type rare earth mineis shallowly buried and is broken, the following measures are adopted. The method comprises the measures that a horizontal impervious curtain is built in a deep bed rock fault zone of a mining region, a vertical impervious curtain is built in a shallow layer bed rock fracture zone on the edge of the mining region, and leaching liquid is prevented against migration and diffusion; self-control extraction wells are installed in a water-rich region in the impervious curtains, the water level of shallow groundwater of the mining region is controlled, and the cross flow pollution is avoided; waterquality monitoring wells are arranged on the periphery of the impervious curtains, the groundwater leaching agent concentration is monitored, and the control over the water level of the shallow groundwater of the mining region is guided; and cleaning operation is conducted with clear water and a low-concentration calcium hydroxide solution in the mining termination phase. By means of the measures,the influence of in-situ infiltration mining on the mine surface / ground water environment is effectively controlled, and the loss of rare earth resources in the mining process is reduced. The ion type rare earth shallow groundwater pollution prevention and control method is suitable for the ion type rare earth mine which is characterized in that the bed rock is shallowly buried and is broken, andcan assist in constructing 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 ...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem of resource loss and shallow groundwater pollution in the existing in-situ leaching mining process of ion-type rare earth mines, and provides a method for controlling shallow groundwater pollution in the process of in-situ leaching mining of ionic rare earths. The common geological characteristics of shallow buried and broken bedrock of ion-type rare earth mines and the technical characteristics of in-situ leaching mining, through preventing leachate, controlling shallow groundwater level, monitoring the concentration of leaching agent in groundwater and surface water, and top washing measures at the end of mining , effectively control the impact of in-situ leaching mining on the surface / groundwater environment in the mining area, and reduce the loss of rare earth resources in the mining process

Images