高矿化度高铁锰矿井水回用处理工艺研究

Study of the Reclamation and Reuse of Mine Water with High-TDS,Iron and Manganese Content

为实现矿井水资源化，解决高矿化度高铁锰矿井水回用处理，分析了该类矿井水的水质特征和处理工艺，采用混凝沉淀烧杯搅拌试验和过滤柱模型试验，研究了混凝荆投加量和曝气对混凝沉淀除铁除锰效果的影响，以及滤料、滤速、过滤周期、反冲洗强度等对过滤出水水质的影响．结果表明：矿井水具有井下溶氧的特点，不需专门设曝气装置；聚合氯化铝（PAC）最佳投药量（质量浓度）为60mg／L，混凝沉淀对铁的去除率在90％以上，而对锰的去除率在20％左右；经KMnO4溶液浸泡的锰砂过滤（滤速7～9m／h），除铁除锰效果优良，出水铁锰的质量浓度都在0．1mg／L以下，能够满足回用水的水质要求，而且启动快、适应能力强．

For resolving technical problem of processing high TDS mine water with high content of iron and manganese, the water quality characteristics and process technology were studied. Based on beaker stirring with coagulation-sedimentation and filter pose model tests, influences of coagulant dosage and aeration on removing iron and manganese were studied, and effects of filter material, rate, period and back-washing strength on effluent water quality were also researched. The results show that the mine water is rich in dissolved oxygen and needn＇t aeration. The optimum dosage of polyaluminium chloride（PAC） is 60 mg/L. The rate of iron removal reaches 90% on the stage of coagulation-sedimentation, while the rate of Mn removal reaches about 20%. The good efficiency of Mn and iron removal is achieved at 7-9 m/h rate of filtration when the Mn sand is impregnated by KMnO4. The concentration of iron and Mn is lower than 0.1 mg/L in effluent water, which can meet the standard of reused water quality.