关键词: 煤矸石;污染组分;淋溶条件;溶出规律;静态淋溶

Abstract: In order to study the leaching law of the main pollution components of coal gangue under different leaching conditions, this paper selected some coal gangue of a certain coal mine in Liaoning province as experimental samples.And through static leaching experiment, combining with XRD and SEM detection techniques,this experiment comprehensively analyzed the contents of Cl-,total hardness, Cu,Zn and other major pollution components of coal gangue in the different solid-liquid ratio, pH, particle size and whether the agitation conditions with the law of time changes.The experimental results show that the dissolved amount of the pollution components is obviously affected by the leaching conditions,and at the solid-liquid ratio of 1:5,the pH value is 5.3,the particle size is less than 5 mm, the intermittent agitation condition,the dissolution's change of Cl-and total hardness is more obvious.In the early stage of leaching, because the surface of coal gangue was weathered, the dissolution rates of pollution components was larger.During the leaching process, the difference of the occurrence of the pollution components makes the dissolution effect different,and due to the formation of secondary phase, the adsorption of colloids and the adsorption of clay in coal gangue,there is a certain degree of fluctuation of the amount of pollution components.

Key words: coal gangue;pollution component;leaching condition;leaching law;static leaching