Study on Leaching Rules of Heavy Metal Pollutants During Dynamic Leaching of Coal Gangue
In order to explore the leaching rules and characteristics of heavy metals in coal gangues by rain erosion,in this paper,coal gangues of a mining area in Xinjiang were taken as the research object and the dynamic simulation leaching experiment is adopted to study on the leaching rules of Fe,Mn,Zn and Cu in coal gangues.The results indicated:the leaching rate was faster and leaching concentration was higher for Fe,Mn,Zn and Cu in the early leaching stage,and as the leaching time elapsed,the dissolution rate of each element decreased,the leaching concentration reduced and finally trended to be stable,and the leaching achieved a balance.To sum up,the overall performance was featured by fast-slow-stable leaching.In combination with the requirements of groundwater quality standards and the maximum leaching concentration of heavy metals during the leaching period,the groundwater in the coal gangue site was suitable for agriculture and some industries.The leaching value of heavy metals during the leaching period(8d)was Fe＞Mn＞Zn＞Cu.Fe had relatively strong leaching activity,but there are potential risks of soil and groundwater migration.The leaching of heavy metals in the coal gangues attenuated in an exponential curve.Therefore,according to the attenuation model,the pollution to soil and groundwater due to heavy metals in coal gangues during dynamic leaching could be quantitatively predicted.The results of this experiment provided data support for determining staking requirements for coal gangue,and created scientific basis for pollution control of water and soil around the coal gangue stacking yard.
国家科技期刊平台
NSTL
万方数据
维普
