Why do you want to join the blast furnace slag limestone, why
Iron to adding limestone chemical reaction formula: CaCO3 = CaOCO2, CaOSiO2 CaSiO3Analysis: the process of adding limestone, iron ore with high melting point of the gangue (silica) reaction, the formation of silicate and remove. Thus reducing the impurity content in pig iron.Because of the iron, there will be sulfur dioxide and other harmful gases, calcium carbonate can be neutralized to reduce harmful gases escape
With iron ore, mainly hematite (the main component is iron oxide) and magnetite (Fe3O4 is the main component), in the iron ore also contains useless gangue, the main ingredient is silicon dioxide (SiO2). During the process of iron making, the reduced iron becomes a liquid at high temperature, while the particles with high melting point of silica are mixed in the molten iron. In order to remove the impurities, the limestone is used as the flux, and the limestone is decomposed into calcium oxide and carbon dioxide at high temperature. Calcium silicate calcium oxide at high temperature and silica reaction is lower than the melting temperature of molten iron, molten iron and calcium silicate liquid density than small and immiscible with molten iron, it floats at the top. The slag outlet of the blast furnace is opened, and the liquid calcium silicate flows out first and then solidified into a blast furnace slag. In the past, the blast furnace slag was discarded as a waste in the iron making plant. Not only destroyed the farmland, but also pollute the environment. Now the blast furnace slag into cement, the past waste into today's building materials.
The role of Limestone: because there are impurities in the iron ore, silica, limestone is the main component of calcium carbonate, calcium carbonate and silica reaction to produce calcium silicate and carbon dioxide is called slag
