Research on comprehensive utilization technology of tailings for green mines
To achieve a green mine with zero tailings discharge,a lead-zinc mine in Sichuan has undertaken a study on the comprehensive and full utilization of tailings after detoxification.Through brief field surveys and investigations of the mine's technical conditions,along with experimental analysis of tailings characteristics,2 schemes were proposed:ungraded tailings backfill and graded fine tailings backfill(coarse tailings used as building materials).Due to the swellability of minerals during grinding,the space in the mined-out areas cannot accommodate all the tailings generated during mining.Thus,it is decided that the ungraded tailings be graded,with a grading threshold of 74 μm,resulting in a coarse tailings productivity of 39.5%.The coarse fraction is dewatered and used as construction sand material,while the fine fraction is thickened and dewatered for use as backfill aggregate,thereby achieving zero tailings discharge.Based on the characteristics of the fine fraction,a paste storage thickener was selected for efficient thickening and dewatering,and the cementing powder from nearby cement factory is used for backfill with cemented graded fine tailings.As can be seen from cost analysis of the 2 utilization schemes,3 422.1 yuan can be saved daily by backfill with graded tailings,showing significant results.The research achievement can be a reference for similar mines when constructing tailings-free green mines.
green minepastetailingscomprehensive utilizationbackfillutilization as building materialseconomic benefits
万方数据
维普
