Product Overview/产品概述:
Silicon manganese alloy is an alloy composed of manganese, silicon, iron, a small amount of carbon and other elements. It is a ferroalloy with a wide range of uses and a large output. Silicon manganese alloy is a commonly used composite deoxidizer in steelmaking, and is also a reducing agent for low-carbon ferromanganese and electro-silicon thermal production of metallic manganese. Silicon manganese alloy can be smelted in large, medium and small submerged arc furnaces in a continuous operation.
Product Introduction/产品介绍:
The consumption of silicon-manganese alloy ranks second among electric furnace ferroalloy products. Silicon and manganese in silicon-manganese alloy have strong affinity with oxygen. When silicon-manganese alloy is used in steelmaking, the deoxidation products MnSiO3 and MnSiO4 have melting points of 1270℃ and 1327℃ respectively, which have the advantages of low melting point, large particles, easy floating and good deoxidation effect. Under the same conditions, the burnout rates of manganese or silicon alone for deoxidation are 46% and 37% respectively, while the burnout rate of silicon-manganese alloy for deoxidation is 29%. Therefore, it has been widely used in steelmaking, and its output growth rate is higher than the average growth rate of ferroalloys, making it an indispensable composite deoxidizer and alloy additive for the steel industry. Silicon-manganese alloy with a carbon content of less than 1.9% is also used in the production of medium and low carbon ferromanganese and semi-finished products of electrosilicon thermal method manganese metal. In ferroalloy production enterprises, the silicon-manganese alloy used in steelmaking is usually called commercial silicon-manganese alloy, the silicon-manganese alloy used in smelting low-carbon iron is called self-use silicon-manganese alloy, and the silicon-manganese alloy used in smelting metals is called high-silicon silicon-manganese alloy. Manganese can be combined with silicon to form silicides MnSiO3, MnSiO and MnSiO3. From the silicon-manganese state diagram, it can be seen that the stable silicide is MnSi. Since the negative value of the free energy of manganese silicide formation is much greater than the negative value of the free energy of manganese carbide production, the higher the silicon content in the silicon-manganese alloy, the lower the carbon content.
Silicon-manganese alloys are all produced by using carbon to simultaneously reduce manganese ore (including manganese-rich slag) and manganese oxide and silicon dioxide in silica in a submerged arc furnace. The signs of normal furnace conditions in silicon-manganese alloy production are stable working current, full-load operation, balanced and deep electrode insertion, uniform electrode consumption rate, normal lowering, about 200mm lowering length per hour, easy opening and blocking of furnace eye, smooth iron and slag discharge, high temperature, good slag and iron fluidity, and easy separation. The alloy composition is stable, m(CaO+MgO)/m(SiO2) in the slag is between 0.7~0.8, and MnO is below 10%. The furnace gas composition is normal, O2 is less than 2%, H2 is less than 8%, the furnace is slightly negative pressure (-49Pa), and the temperature in the furnace is lower than 600℃.
