Environmental Effects Of Arsenic Element Releasing And Migrating In Ma'an Qiao Mine Area

Using the leaching tests and chemical analysis methods, Ma'anqiao gold mining areas of arsenic in the waste rock, tailings release, migration, transformation laws, and its application in soil and stream sediment exist in the form of research, a brief analysis of the arsenic elements in surface water, sediment, tailings and soil characteristics of the spatial distribution of gold mining activities in the region to bring Ma'anqiao arsenic preliminary analysis of environmental impacts.Leaching experiments show that: the initial poured the filtrate pH value of the waste rock and tailings filter out the impact of solution pH value, but to filter out the arsenic solution elements have a certain impact, the majority of arsenic in the filtrate water pH for the 5.5 fluid filter out the highest level. Sulfide minerals containing mainly abandoned arsenic in the rubble heap of time with the increase in concentration decreased significantly with the stage and zoning.Stacked tailings in the early stages of acidification does not occur in general, and the leaching of arsenic was very low. Tailings - water interactions in tailings has led to the activation of arsenic migration and pollution of water bodies. Ma'anqiao of arsenic in mine tailings element weak water transport, water transport coefficient is only 0.18. Although the tailings of arsenic in the water migration coefficient of the smaller, but because of its tailings in a high arsenic content, it is also the tailing sand Ma'anqiao arsenic contamination of surface water as a major potential source of pollution.Reclamation of tailings characteristics of the spatial distribution of arsenic are: the general trend of horizontal peripheral loss, the middle concentration, vertical, in the depths of 40 ~ 60cm shows enrichment and reclamation may be artificial and shallow conducive to the morals of the vertical migration of arsenic to the reclamation of the interface layer (usually 40cm) Enrichment Department.In comparison with the standard of national food hygiene standards, Chinese cabbage, hot peppers, radishes of As content in all standard, the superscale times of As is 1.8 ~ 169; compared with the edible plants, wild plants, pioneer settlers of natural arsenic content of more than higher, and different As plants have obvious selective. As much as containing Imperata 52.0mg.kg-1, in comparison, the Absorptive capacity of Duck foot grass and Artemisia about As less than Imperata, but in extreme habitats in the viability of a strong, still considered the ecological restoration of mine preferred species.Ma'anqiao mining vegetables, radish transfer coefficient of arsenic is greater than 1, indicating that part of the ground to absorb more arsenic. Chinese cabbage in the transfer coefficient of arsenic is less than 1 transfer coefficient that is relatively low. Duck grass toe transfer capacity is relatively low.Ma'anqiao mining pollution mining activities in the process of formation of each other, stacking, acceleration and toxic pollution to enlarge "Butterfly Effect." Release and migration of arsenic in the model: when leaching by rainfall, resulting in the As-rich acid mine drainage, leaching through the infiltration occurred in the vertical direction and migration into the surrounding water and soil, pollution of water bodies, destruction of the living environment of biological , Lead to lakes and rivers to reduce the bacteria and micro-organisms and impede self-purification of water bodies, to accelerate further deterioration of water bodies. Damage to soil nutrition, the composition of the structure, resulting in the survival of plants can not be settled. In dry weather conditions, atmospheric dust pollution through the surrounding environment. Contaminated water, soil and the atmosphere of harmful substances into the animals and plants through biological Lin body, thereby endangering human health.According to the geographical and climatic conditions in Ma'anqiao mines, the mining area to repair the ecological environment can make use of "biological control" measures to support a variety of techniques and means to ensure achievement of that goal. Restoration Area are classified into three types of pollution and bioremediation in three phases. Ecological restoration of mining areas to select the species of the pioneer settlers of natural plant-based, especially in the strong resistance of native species of plants cultivated repair. With the growth of the mining area Ma'anqiao Hyperaccumulator natural habitats and extreme site conditions conducive to the growth of hyperaccumulator plants, instructions and patience plants plant variation, evolution.