Research progress on collaborative utilization of organic solid waste in iron and steel processes
The collaborative utilization of organic solid waste in the steel process has natural advantages.High tem-perature conditions and a complete pollutant treatment system in the process are conducive to the harmless disposal of organic solid waste.Futhermore,there is no possibility of them casusing secondary pollution to the environment.Organic solid waste is used as fuel to replace fossil energy,which not only cuts steel production costs but also reduces CO2 emissions,turning waste into treasure.The collaborative utilization of organic solid waste in the steel process achieves multiple benefits such as green sustainable development and ecological environment protection,and meets the actual development needs of steel companies.The research progress of organic solid waste disposal in steel processes,and outlines the current utilization status and technical bottlenecks of organic solid waste in iron ore sintering,blast furnace ironmaking,rotary hearth furnace,electric arc furnace steelmaking and other steel production processes were summarized.Combining the advantages and characteristics of the rotary hearth furnace technology in the field of solid waste,the author proposes a new multi-kiln integrated organic solid waste treatment technology cen-tered on the rotary hearth furnace,specifically including the organic solid waste heat transfer system,the rotary hearth furnace system,and the conversion pyrolysis furnace system and flue gas control system.The system uses a pyrolysis gasification furnace to pyrolyze organic solid waste to produce combustible gas and pyrolysis carbon.Com-bustible gas is used to replace natural gas to provide energy for the rotary hearth furnace.Pyrolytic carbon can replace coke powder,coal powder and iron and zinc dust sludge to prepare carbon-containing pellets,and obtain valuable metal dust and metallized pellets under rotary hearth furnace smelting conditions.After the valuable metal dust is enriched,high value-added metals such as zinc ingots,lead ingots,and indium ingots are obtained through a combined fire-wet process.Metalized pellets are produced through a hydrogen plasma melting pyrolysis furnace to produce molten iron.The flue gas of the entire process is concentrated in the rotary hearth furnace flue gas treatment system to achieve ultra-low pollutant emissions,which provides a new idea for the coordinated treatment of urban organic solid waste in the steel process.
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