Experimental research of reducing the silicon content of hot metal

Three methods were analyzed to reduce the silicon content of hot metal in theory:controlling silicon resource, decreasing the drip zone's altitude, and increasing the oxidation of slag in hearth. Some factors to influence the silicon content of hot metal were proposed on the basis of the experiment in the lab:increasing the binary basicity is favorable to desiliconization; the oxide in slag debases the silicon activity and is of great advantage to desiliconization; Al₂O₃ and SiO₂ are disadvantageous to desiliconization; the volatilization content of SiO₂ in coke increases with increasing smelting temperature, leading to increase the silicon content of hot metal; the silicon content of hot metal increases with increasing the drip zone's altitude. The measures of reducing the silicon content of hot metal were applied in JIAN-Long Iron and Steel Company in Tangshan according to the test results. The result of reducing the silicon content of hot metal was obvious, and the mass fraction of silicon in molten iron was reduced to 0.40% from 0.55%.