Influence of CaF₂ and MgO Addition on the Melting and Dripping Property of Blast Furnace’s Vanadium and Titanium-bearing Burden

In order to tackle problems found in blast furnace (BF) smelting of vanadium-bearing titaniferous magnetite,experiments were carried out.Operation conditions of the BF cohesive zone were simulated in a high-temperature MoSi₂ furnace to study the influence of the addition of CaF₂ and MgO to vanadium and titanium-bearing BF burden on burden permeability,thickness of the cohesive zone,the temperature for sudden increase of pressure differential and the cohesive and molten zones etc.The results show that the addition of CaF₂ has no noticeable influence on the initial softening temperature,but narrows the softening temperature range,which means the formation of first slag zone is too earlier.As a result,the thickness of the cohesive zone,the maximum pressure differential and the general characteristic values are elevated.The addition of MgO raises the initial softening temperature,and narrows the softening temperature range as well,which indicates it addition lowers the cohesive zone,and makes it thinner.