Research on progress of zinc extraction process from iron and steel metallurgical sludge
Iron and steel metallurgical dust sludge is a by-product of iron and steel smelting processes,which contains a certain amount of metalic zinc resources.Adopting reasonable technology to extract zinc from iron and steel dust sludge can not only reduce environmental pollution,reduce the adverse effects of zinc on smelting processes,promote green production in iron and steel enterprises,but also increase zinc resources.On the basis of summarizing of the source,chemical composition and phase composition of iron and steel metallurgical sludge,the utilization status and treatment technology of zinc resources in iron and steel metallurgical dust were summarized.The principles,advanta-ges and disadvantages of zinc extraction processes such as physical method,fire method,wet method,deep eutectic solvent leaching method,ultrasonic method,micro wave method and biological method were described in detail.The physical treatment process has the advantages of simple operation,low investment and operation cost,but the treat-ment efficiency is generally not high,and it is generally only used as a pretreatment process for fire and wet proces-ses.Although pyrometallurgical methods can handle large amounts of metallurgical sludge,the purity of the products obtained is not high.Meanwhile,there are problems such as high pollution and high energy consumption.Compared with pyrometallurgical methods,wet process requires less capital,has higher environmental benefits and higher selec-tivity,lower energy consumption and less harmful gas emission.However,it also has some disadvantages such as high concentration of leaching agent,slow reaction speed and serious corrosion to equipment.The emerging proces-ses such as deep eutectic solvent leaching,ultrasonic method and biological method have certain advantages over tra-ditional processes in zinc extraction.However,in practical applications,there are also some problems that need to be improved and further promoted.The effective combination of emerging zinc extraction technologies with traditional processing methods and the development of cleaner and more environmentally friendly and efficient zinc extraction processes are important directions for the future resource utilization of steel and iron metallurgical sludge.
iron and steel metallurgical sludgezinc extractiontreatment processcomprehensive utilizationpro-gress
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