Optimal Allocation Of Mine Water Resources And Optimization Of Water Treatment Process For High-iron And Manganese Mine

There are over 20 large and medium-sized coal mines in Fengfeng,Handan and Xingtai mining areas in the south of Hebei Province.Replenished by the underground water in the loess plateau to the west of the Taihang Mountains,Handan and Xingtai mining areas enjoy abundant mine water resources with a preliminary water yield estimate of about 36 million m3 / a.At the same time,the northern part of China,especially the south of Hebei Province,is in a serious water shortage,restricting local economic development and the improvement of people’s living standards.Optimizing the allocation of mine water resources is the only way for sustainable development of enterprises,and also the inevitable choice for the development of coal mines.In this paper,the mine water of seven mines in southern Hebei Province is studied.The allocation of their water resources is optimized through the field investigation,site sampling and laboratory detection and analysis of water quality of the mines.At the same time,the treatment process of mine water containing iron and manganese is improved.In this paper,the iron and manganese removal process for the mine water in the second mine is optimized.To promote the oxidation of Fe2+ to Fe3+ in the water,aeration is carried out in the regulating reservoir to increase oxygen content in the water,so as to achieve the optimal iron removal by coagulation.The coagulation effect is best when polymerization ferric chloride is used as the coagulant at a dosage of 80 mg / L with the dosage of the coagulant aid PAM at 0.7 mg / L,in which case,the iron removal rate is up to 90% after coagulating sedimentation.However,the manganese removal rate is only about 20% and the water does not meet the reuse standard,requiring further manganese removal through filtration.Natural manganese sand is used as the filter medium at a filter bed height of 800 mm and a filtering velocity of 8 m / h.After filtration,the water quality is good with the manganese content below 0.1 mg / L and the iron content lower than 0.3 mg / L.Since mine lots are relatively independent from each other in Handan and Xingtai areas,there are no mine water pipe networks among the mine lots or connecting them to the urban areas.Considering this situation,the water resource optimization mode for these areas is determined to be mainly internal recycling,supplemented by externalutilization,which focuses on the water use in the mining areas in combination with water supply for surrounding areas.The processed mine water quality of the seven mines in Handan and Xingtai areas is investigated.At present,the mine water utilization rate in the mine areas is only 50%.After optimizing the mine water resources in the mines,their total water yield reaches524400 m3 / d,and the utilization rate reaches over 90%.The treated mine water is mainly used with industrial water,agricultural irrigation and landscape water.After optimizing mine water allocation in the mines,by using the processed mine water instead of domestic water as the production water supply.The combined cost of mine treatment of mine water for a year is more than 20 million yuan,which is 56% lower than the comprehensive cost of mine water which has not been optimized for one year.Optimizing the allocation of mine water resources greatly improves the utilization rate of mine water,reduces the exploitation of groundwater resources and cuts the pollution to the surrounding environment.It also alleviates the industrial and agricultural contradictions,bringing enterprises economic and social benefits.