材料期刊网

报告了CaO-SiO_2-TiO_2-Al_2O_3-MgO系熔渣的粘度及熔化性,并考察了还原条件下温度、熔渣組成以及Ti_2O_3和含碳量对粘度变化的影响。結合粘度測定,較詳細地研究了高溫还原条件下钛渣的矿物組成。根据实驗結果,討論了钛渣性貭与高炉冶炼的关系。

The viscosity of slags containing Al_2O_3 15%, MgO 10%, TiO_2 15—35% and with a CaO/SiO_2 ratio of 0.6—1.6 has been measured with an oscillating viscosimeter. Experimental results indicate that the viscosity of titanoslags is very low provided they are not previously subjected to a strong reducing action. The melting point of the slags depends on the CaO/SiO_2 ratio and TiO_2 content. Under a strong reducing condition, however, the TiO_2 can be reduced to lower oxides and even titanium carbide, and the slags become, quite viscous. An increase of temperature and decrease of CaO/SiO_2 ratio increase the rate of thickening. Experimental evidence verifies the presence of finelydispersed titanium carbide, which is the primary cause for thickening. The addition of an oxidizing agent or blowing of slightly oxidizing gases such as CO+CO_2 through the slag can prevent the latter from becoming viscous. These measures might prove helpful in blast-furnace smelting of titanium-containing iron ores.The main mineral constituents of the titanoslgs under investigation are perovskite, anosovite, baikovite and titaniferrous augite. Their relative amount depends upon the chemical composition of the slags and the degree of reduction.