Application of refractory materials for electric furnace roof

December 28, 2018

Application of refractory materials for electric furnace roof

Initially, the top of the electric furnace was built of silicon bricks. Because high alumina materials have better refractoriness, high temperature erosion resistance and thermal shock resistance than silica bricks, high alumina materials have been tested since the late 1960s. After the 1990s, the integral prefabricated furnace cover with high alumina or corundum refractory castable and steel fiber was generally used in the electrode triangle area. Because the service life of the large bricks and the lining bricks are not synchronized during the use process, the life of the electric furnace is low, and sometimes the repair is extremely difficult due to serious damage to the large bricks at the bottom of the furnace. In order to solve this problem, magnesia ramming materials at the bottom of the furnace is promoted on the electric furnace.

So what are the advantages of using magnesium ramming materials as the electric furnace roof refractory?

(1) Magnesium ramming material is simple in composition and can be replaced at any time. Its cost is only 1/4 of the general castables.

(2) Magnesium ramming material has superior high temperature resistance, eliminating the auxiliary water cooling device of the electric furnace, reducing energy consumption and ensuring production safety.

(3) The composition of the magnesium ramming material is uniform, and it will not be damaged due to the difference thermal expansion of the material during use, so as to ensure the service life.

(4) After using magnesium ramming materials, the electric furnace top cover does not need to be filled as a whole, and the top of the furnace is divided into blocks, which is more convenient and safe to lift, and is easy for handling of furnace conditions and emergencies.

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