Study on the Adsorption Characteristic of Steel-Making Slag Haydite for Phosphorus

Xiao Liu; Xue Lian Li; Guo Ping Cao; Shi Qi Han

doi:10.4028/www.scientific.net/AMR.750-752.1296

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Study on the Adsorption Characteristic of Steel-Making Slag Haydite for Phosphorus

Abstract:

Steel-making slag haydite was prepared with steel slag and clay. Bath sorption experiments were carried out to study the adsorption characteristic of steel-making slag haydite for phosphorus (P). The results show that the adsorption process of steel slag haydite for P conforms to pseudo-second-order kinetic equation, and the activated energy was 41.52KJ/mol. Isothermal adsorption process conforms to the Laguir equation , and at 20°C ~ 40°C, the maximum P uptake value increased from 1.166 mg/g to 2.422 mg/g. Both kinetic and thermodynamic studies indicate that chemical adsorption is the dominant mechanism for P removal which would be promoted by heating-up, and the reaction is heat-absorbed, thermal charge-increasing and spontaneous.