Ferrochrome C0.5 powder
The equipment used in the process of oxygen blowing low carbon ferrochromeC0.5 is converter, so it is called converter.According to the different ways of oxygen supply, oxygen blowing can be divided into side blowing, top blowing, bottom blowing and top blowing.The top - blown converter method is adopted in China.
Oxygen blowing is to directly blow oxygen into liquid high carbon chromium iron to decarburize and make low carbon chromium iron.The main elements of high carbon chromium iron are chromium, iron, silicon and carbon, which can be oxidized.The main task of oxidizing high carbon ferrochrome is decarburization and chromium preservation.When oxygen is blown into liquid high carbon ferrochrome, since the content of chromium and iron accounts for more than 90% of the total alloy, chromium and iron are first oxidized, and these oxides then oxidize the silicon in the alloy.Due to the oxidation of chromium, iron and silicon, the temperature of molten pool increases rapidly and decarbonization reaction develops rapidly. The higher the temperature, the more favorable for decarbonization reaction and inhibits the oxidation reaction of chromium, the lower the carbon in the alloy can be.
The raw materials for making low carbon chromite by oxygen top blowing are high carbon chromite, chromium ore, lime and silicon chromium alloy.High carbon chromium ferrite for converter requires high temperature, usually between 1723 and 1873K.Iron water contains more than 60% chromium, less than 1.5% silicon and less than 0.036% sulfur.Chromium ore is used as slag material, the content of SiO3 in chromium ore is required to be low, the content of MgO and Al2O3 can be appropriately high, and its viscosity cannot be too large.Lime is also used as slag material, which has the same requirements as the electric silicon thermal method.Silicon chromium alloy is used for reducing high chromium furnace slag in the later stage of blowing.