Apr. 20, 2018
Refractory materials used in open hearth smelting chambers and related parts. Open hearth furnace, also known as Martin furnace, is a smelting furnace that uses coal gas or heavy oil as fuel to smelt pig iron and scrap into steel.The open hearth is generally divided into an acid open hearth furnace and a basic hearth furnace according to the type of refractory material used in the melting chamber.
The open hearth was built in 1865. Around 1950, its melting chambers, furnace heads, regenerators, and other parts of the upper part of the building were used for the construction of silica bricks. In the regenerators, the lower and middle parts of the regenerator are made of clay bricks or high-alumina bricks. It is called acid open hearth furnace and has a low service life. The furnace life is 100 to 200 times. Around the 1950s, due to the development and application of basic refractory materials such as fired magnesia bricks and magnesia-chromium bricks, silicon brick masonry furnaces were gradually replaced, that is, alkaline open-hearth furnaces. The service life was significantly improved and the average furnace life was approximately1000 times.
China Open Hearth was built in 1890. Since 1980, in order to increase the productivity of open hearth steelmaking, most open hearth furnaces have gradually changed into top-blowing oxygen furnaces.Due to the intensified smelting, the age of the furnace is greatly reduced, generally around 300 times. Therefore, advanced alkaline refractory materials were developed to meet the needs of new open hearth steelmaking processes.