不同风化层泥质砂岩重金属浸出浓度如图3所示：Fe、Ca、Hg、As、S

Leaching concentrations of heavy metals in different weathering shaly sand layer 3: Fe, Ca, Hg, As , Sb and Tl increasing concentrations leaching from off-white to gray and black inner layer, exhibit an increase in the degree of wind liter high trend. Leaching Mg concentration and brown gray-black middle layer is also greater than the concentration of the leaching of the inner gray. <br>Wherein the leaching of Fe and Ca at the highest concentration of black ash ratio of outer and inner respectively an off-white 10.7 times and 3.4 times; Hg, As, Sb and Tl highest gray leached weathering layer and an inner layer concentration ratio was 8.5 times, 5.3 times , 6.7 times and 5.5 times. DESCRIPTION In long-term weathering and leaching, migration loss effect shaly sands gray-black heavy metal layer is significantly larger than the gray inner middle and brown.

The leaching concentration of heavy metal in mud sandstone in different weathering layers is shown in Figure 3: Fe, Ca, Hg, As, Sb and Tl leaching concentrations increase gradually from gray-white inner to gray-black outer layer, showing a tendency to increase with the increase of weathering. Mg leaching concentrations in the gray-black outer and brown-yellow mid-layers are also greater than the leaching concentrations of the gray-white inner layers.<br>Among them, Fe and Ca had a maximum leaching concentration ratio of 10.7 times and 3.4 times in the gray-black outer layer and gray-white inner layer, respectively, and Hg, As, Sb and Tl had a maximum leaching concentration ratio of 8.5 times, 5.3 times, 6.7 times and 5.5 times in the weathered layer and gray-white inner layer, respectively. It is shown that under the long-term weathering leachate effect, the migration loss of heavy metals in the black outer layer of mud sandstone ash is significantly greater than that of the brown-yellow middle layer and the gray-white inner layer.

The leaching concentration of heavy metals in argillaceous sandstone of different weathering layers is shown in Figure 3: the leaching concentration of Fe, CA, Hg, as, Sb and TL gradually increases from the gray white inner layer to the gray black outer layer, showing the trend of increasing with the weathering degree. The leaching concentration of Mg in the gray black outer layer and brown yellow middle layer is also higher than that in the gray white inner layer.<br>Among them, the highest leaching concentration ratios of Fe and Ca in the outer layer of gray black and the inner layer of gray white are 10.7 times and 3.4 times respectively; the highest leaching concentration ratios of Hg, as, Sb and TL in the weathered layer and the inner layer of gray white are 8.5 times, 5.3 times, 6.7 times and 5.5 times respectively. It shows that under the long-term weathering and leaching, the migration and loss of heavy metals in the gray black outer layer of argillaceous sandstone is significantly greater than that in the brown yellow middle layer and gray white inner layer.<br>