The equipment used in the oxygen blowing method of low carbon ferrochromium in oxygen blowing is a converter, so it is also called the converter method. According to different oxygen supply methods, oxygen blowing can be divided into four types: side blowing, top blowing, bottom blowing and top and bottom blowing. The oxygen blowing method is to blow oxygen directly into liquid high-carbon ferrochromium to decarburize it to produce medium-low carbon ferrochrome.
The specific process is: when oxygen is blown into liquid high-carbon ferrochromium, since the content of chromium and iron accounts for more than 0.9 of the total alloy, chromium and iron are oxidized first, and then these oxides oxidize the silicon in the alloy. Lose. Due to the oxidation of chromium, iron, and silicon, the temperature of the molten pool increases rapidly, and the decarburization reaction develops rapidly. The higher the temperature, the more conducive to the decarburization reaction, and can inhibit the oxidation reaction of chromium, and the lower the carbon in the alloy can be reduced. .
The raw materials for oxygen top blowing refining of low-carbon ferrochromium are high-carbon ferrochromium, chromium ore, lime and silicon-chromium alloy. The high-carbon ferrochromium liquid in the converter requires a high temperature, usually between 1723 and 1873K. Lime is also used as a slag-making material, and its requirements are the same as those of the electrosilicothermal method. Silicon-chromium alloy is used to reduce high-chromium slag in the later stage of blowing. Generally, the silicon-chromium alloy powder sieved after crushing can be used.
