Research And Engineering Application Of Mine Water Resources Utilization Technology

Coal industry has the characteristics of large water consumption and displacement,and its wastewater discharge is mainly mine water generated in the process of mining.For a long time,due to technical limitations and lack of understanding,many mine drainage has been discharged as waste water,which not only wastes valuable water resources,but also damages the surrounding ecological environment.In recent years,with the development of people's understanding and water treatment technology,the utilization rate of mine water resources has been greatly improved.The mine water in this area is mostly mine water with high salinity.Local environmental protection departments are demanding that mine water not be discharged in some areas.In order to achieve zero discharge of mine water with high salinity,the key is to deal with the concentrated brine produced by desalination,and realize the complete separation of water and impurities,and use them separately.This paper analyzes and studies the common technologies of high salinity mine drainage,summarizes the applicability and advantages and disadvantages of various technologies,integrates the existing technologies,and develops a process route suitable for the utilization of high salinity mine water resources.It lays a theoretical foundation for the research.Relying on the project of deep treatment and resource utilization of mine drainage of zhongtianhechuang and the support of technical enterprises in the industry,the laboratory pilot test of the key process "ultrafiltration + nanofiltration" was carried out.The removal of pigment and COD by ultrafiltration membrane and the separation of Na2SO4 and NaCl by nanofiltration membrane were studied respectively.The results showed that the removal rate of pigment and COD by ultrafiltrationmembrane module could reach about 40%,and the ultrafiltration membrane filtrate was then separated into sodium sulfate and sodium chloride solutions by the nanofiltration membrane module.In the separated solution,sodium chloride accounted for over 95%of the total TDS in the solution,and sodium sulfate solution accounted for over 90% of the total TDS in the solution.After crystallization,the purity of sodium sulfate reached more than 98%,and that of sodium chloride reached more than 97%,meeting the requirements of industrial salt.According to the quality of raw water,two mine drainage treatment schemes were worked out,and the technological process of deep mine drainage treatment in zhongtianhechuang mine was determined through comparative analysis.Through the experimental study of the key process to determine the process parameters,optimize the process flow,and finally realize the application of engineering examples,and obtain good ecological and economic benefits.