| In Huaibei mining area as the research object, using "3S" technology on the part of the mining area land destruction and use survey, stud on classification of land use and driving force analysis of mining area with using spatial analysis tools. Taking the different types of coal gangue in Luling Coal Mine of Huaibei as the case. According to different sources of gangue will coal gangue in the region divided into fine coal, crude gangue and the washing gangue 3 classes. Study on the physical and chemical properties of different types of coal gangue. The experiment area was set up in the study area, and the geological environment effect of reclaimed land was studied by using different kinds of coal gangue in the mining area. Monitoring the distribution characteristics of heavy metals in reclaimed land by planting crops on reclaimed land. The theoretical basis is provided for the reclamation and reclamation of the coal gangue filling reclamation area in the coal mine and even in our whole country.The results show that:(1) The 3S technique is rapid, accurate and convenient access to the study area land use and land cover dynamic change:the continued exploitation of coal makes mine a lot of land to collapse waters, also in the government and the mining group of subsided land reclamation utilization, part of the damaged land to get efficient use.(2) The physical and chemical properties of different types of coal gangue are different. The mainly in the two aspects of block size and lithology. Fine coal and washed gangue mainly to small pieces of gangue, coarse gangue fragmental size generally larger; washed gangue mainly in many clay minerals of mudstone dominated, coarse gangue mainly in sandstone and siltstone.(3) The different types of coal gangue and control soil saturated water rate vary greatly, the performance of the control group soil> washed gangue> fine waste> crude waste; and different types of coal gangue soil reconstruction of shallow groundwater adsorption ability:the washing gangue> fine gangue is coarse waste.(4) The heavy metal in soil reclamation reconstruction area and to the distribution and migration of vegetation has unique characteristics, the content of 7 heavy metals in three types of coal gangue Cu, Pb, Zn, Sn, Hg, Cd and Cr for reclamation were not more than two national standards of soil environment quality, low degree of enrichment; 7 kinds of heavy metals in different regions of Maize in the studied area Cu, Pb, Zn, organ of Sn, Hg, Cd and Cr in fruit enrichment degree is low, high degree of enrichment in the leaves in the same block; corn research area in different organs and different organs of the same block of corn heavy metal enrichment degree is different; there are different degrees of correlation between the heavy metal contents in different organs of corn and coal gangue in study area, different organs of different enrichment capacity to absorb heavy metals, coal gangue and heavy metal content in leaves have high correlation with vegetation organ Absorption and accumulation of heavy metals in general.(5) The effect on the coal gangue backfilling effect of water in most of the indexes is larger, fine waste of pH and fluoride in water quality indexes influence larger; effect of coarse waste of water in lead and zinc chloride and water quality index larger; the washing gangue on water quality indexes of water in copper, lead, iron and chloride larger; all kinds of coal gangue mainly through energy release and calcium magnesium ion combination of alkaline anion indirectly influence the content of calcium and magnesium in water; copper, zinc, iron, calcium and magnesium and chloride in the water enrichment effect is weak, lead in the water has a rich set effects. |
PDF Full Text Request