CONTROL OF DIOXINS IN ELECTRIC STEELMAKING:ADSORPTION TECHNOLOGY BY ACTIVATED CARBON
With the increasing proportion of electric arc furnace(EAF)steelmaking in the field of steel production in China,the problem of dioxin pollution caused by the steelmaking process is getting worse.Activated carbon adsorption technology is considered to be the most promising strategy for removing dioxins from flue gas in the EAF steelmaking industry.In this paper,a systematic study was carried out on the preparation of activated carbon suitable for dioxin adsorption,and the main conclusion includes:1)hydroxypropyl methylcellulose(HPMC)and low-melting-point glass powder(ST880)can be used as a new type of green binder for activated carbon molding,avoiding the use of coal tar and asphalt,and reducing the production of pollutants in the process of activated carbon production.HPMC are water-soluble cellulose ether derivatives,which are mainly used to improve the abrasive resistance of activated carbon before high-temperature activation.As inorganic functional materials,low-melting-point glass powder has excellent thermal stability and high-temperature adhesion,ensuring that the formed activated carbon will not be broken into powder in the process of high-temperature activation,and still has a certain abrasive resistance after high-temperature activation.2)According to the requirements of dioxin adsorption on pore structure parameters of the activated carbon,the directional pore structure of formed activated carbon was modified by a simple water vapor activation strategy.The appropriate liquid water flow rate is not only related to the yield of the sample but also affects the pore properties.The improved liquid water flow and the improved activation time when the total amount of liquid water is constant are conducive to the diffusion of water vapor inside the activated carbon and the reaction with carbon atoms,and it is easy to obtain activated carbon with a high mesoporous ratio.The activated carbon was activated with 180 mL/h of water vapor at 950 ℃ for 4 hours,the yield was 50.1％,and the mesopore volume was 0.36 cm3/g.The removal efficiency of dioxin in activated carbon products was 90.9％.
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