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In the process of mining, there will be a large amount of land that cannot be used without treatment, also known as mining abandoned land. There are various kinds of pollution caused by production in abandoned land. Mine restoration means to repair the pollution of mining abandoned land and realize the reuse of land resources。
There are many causes of mining abandoned land, including the accumulation of stripped topsoil, the accumulation of rock fragments and low-grade ores, the formation of empty mining areas and subsidence areas, the accumulation of tailings, and the land that cannot be used and developed by mining。In a broad sense, it also includes the smelting slag deposits formed by the smelting of ore, and the degraded land caused by heavy metals and sulfur dioxide emissions during the smelting process。
Heavy metal pollution and acid drainage pollution are the main pollution in abandoned mining land, and ecological restoration and pollution control are the main treatment contents。Mine pollution remediation is restricted by landform, climate characteristics, hydrological conditions, soil physicochemical and biological characteristics, surface soil conditions, potential pollution and other factors. Therefore, the selection of remediation technology and implementation plan should consider the influence of various factors。