Calculation and Analysis of Sulfide Element Discharged During BF Slag Granulation
About 85％of the sulfur element in the BF charge is discharged along with the slag.The sulfide element dis-charged during slag granulation is calculated and analyzed.The results show that:(1)a large amount of H2S and SO2 mass is generated within 0.3s after the slag contacts water,and part of the H2S mass is converted into SO2 mass when they are e-mitted to the atmosphere with steam and aerosols,and H2 SO4 mass will be formed when the temperature is low;(2)as the load of sulfur charged to the furnace is 4kg/t,the sulfide emitted from the chimney of the slag granulation system is 369.96 mg/m3 if all of sulfur is converted into SO2,and 196.54mg/m3 if all converted into H2S;(3)according to the test results of a slag treatment system for a 1500m3 BF,the measured peak sulfide emission is higher than the calculated one;(4)part of H2S and SO2 masses react with Ca(OH)2,forming CaSO4·O.5H2O and CaSO4·2H2O masses,which will crystallize and will be precipitated during the circulation;they are the root causes of filter layer caking and pipeline blockage.
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