Experimental study on water immersion digestion of free calcium Oxide in steel slag tailings
With the rapid development of technology in the metallurgical industry,steel production has been increasing year by year,and steel slag,as a byproduct,has seen a rapid increase in production.Free calcium oxide(f-CaO)in steel slag has a significant impact on the environment.To investigate the factors affecting the digestion of f-CaO in steel slag during water immersion,experiments were designed to investigate the effects of different liquid-solid ratios,steel slag particle sizes,water change times,stirring time,and other factors on the digestion of free calcium oxide in steel slag.The experimental results showed that the particle size of steel slag and appropriate stirring time had the greatest impact on the digestion effect of free calcium oxide.The content of free calcium oxide in the original slag was 7.17%.When the particle size of steel slag decreased from 1 mm to 0.15 mm,the content of free calcium oxide decreased from 5.21%to 4.92%.At the same time,increasing the stirring time by 5 minutes,the content of free calcium oxide further decreased to 2.45%when the particle size was 0.15 mm.This condition is more reasonable from the perspective of energy conservation.
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