The desulphurization test of pretreated hot metal using four different structure active limes with specific surface area 1.891-2.664 m

2

/g and average pore diameter 575.5-814.9 nm is carried out in a high vacuum arc melting spinning quenching machine. The surface morphology of different lime sample is analyzed by scanning electron microscope and the specific surface area and the average pore diameter of lime are measured by a fully automatic mercury injection apparatus. Experimental results show that with increasing the average hole diameter

the desulphurization rate of hot metal decreases and with increasing the specific surface area the desulphurization rate increases ； the optimum ratio of desulphurization agent is 1：50

in this case the sulphur content in hot metal decreases to 0.001 % from 0.014%.