The AOD furnace is an argon-oxygen blown converter for two-step steelmaking. It is an atmospheric refining furnace. Its appearance is similar to that of a converter. It is mainly used for smelting stainless steel.
The working characteristics of AOD furnace are:
1.High working temperature. In order to reduce the carbon content in
steel to a very low level, the refining temperature needs to be
increased to over 1700 degrees Celsius.
2.The molten steel is stirred vigorously. The spraying of a large
amount of high pressure caused the molten steel to agitate violently.
3.The alkalinity of the slag changes greatly.
4.Intermittent operation.
The working process of the AOD furnace
is to first blow oxygen to decarburize, then add ferrosilicon or
aluminum to reduce the chromium in the slag, and then add lime for
desulfurization. During the whole smelting process, the slag changed
from acidic to alkaline, and the atmosphere changed from silicon oxide
to reducing atmosphere. Due to the above working characteristics, refractory materials
for AOD furnaces are required to have high refractoriness and high
temperature strength. Good thermal shock resistance and strong slag
resistance. Especially for the tuyere and the area around the tuyere, it
is more necessary to use refractory materials with good corrosion
resistance and peeling resistance. The refractory materials commonly used in AOD furnaces are magnesia chrome bricks, magnesia carbon bricks,
and magnesia dolomite bricks. In order to form a balanced furnace
lining, the upper part of the tuyere is fused and then combined with
magnesia chrome bricks, the other parts are directly combined with
magnesia chrome bricks, or the tuyere part uses pre-reacted magnesia
chrome bricks, and the rest are magnesia dolomite bricks. The top of the
furnace can be made of high-aluminum refractory castables and
refractory plastics, or can be built with magnesia bricks.
Article Source:The development and function of long nozzle
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: info@cxrefractories.com
Website:http://www.cxrefractories.com
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