The correct operation plan of the ramming material used in the bottom of the electric furnace

The quality and life of the ramming material used in the bottom of the electric furnace is very important to the operation and smelting effect of the electric furnace. At present, MgO-CaO-Fe2O3 dry ramming materials are widely used as the bottom material of the furnace, and they use high calcium and high iron magnesite as the raw material , It is made by high temperature (2250℃) firing and crushing. This material is resistant to high temperature, corrosion resistance, erosion resistance, has the advantages of fast sintering, high toughness, and not easy to float, and the use effect is very good. Today, Luoyang Allpass Kiln Industry Co., Ltd. will take you to understand the correct operation method of ramming material used in the bottom of electric furnace:

(A) Prepare enough ramming materials according to the size of the furnace bottom. Wet materials are not allowed to be used, and foreign objects are not allowed to be mixed;

(B) Five layers of standard bricks are built on the bottom of the furnace bottom, and the ramming material is directly laid on the laid bottom layer. If the construction is on the original bottom layer, the bottom layer needs to be cleaned to expose the bricks and remove the surface residues;

(C) The total thickness of the knot is 300mm, and the knot is divided into two layers, each layer is about 150mm thick, hit with a hammer or step on the bottom of the pot;

(D) After the first layer is rammed, use a rake to rake out a “cross” and “X”-shaped groove about 20mm deep on the surface, and then put another layer of ramming material to step on or ram it to make the two layers Can be better integrated between the two (special attention should be paid to solidify the edges);

(E) After tying the knot, insert a steel rod with a diameter of about 4mm with a pressure of 10Kg, and the depth does not exceed 30mm to be qualified;

(F) After laying, use a thin iron plate (or 2-3 layers of large blades) to completely cover the bottom of the furnace;

(G) The electric furnace with bottom material laid should be used as soon as possible, and should not be left for a long time.

Maintenance method:

(A) In the first furnace smelting, first use light and thin steel scrap to pave the bottom of the furnace to minimize the impact of adding scrap steel. It is strictly forbidden to use heavy scrap to impact the bottom of the furnace, and the first two batches of smelting steel do not blow oxygen to allow it to naturally melt , The heating of power transmission should not be too fast, and the furnace should be washed according to the situation;

(B) The first 3 furnaces adopt the operation of retaining molten steel to facilitate bottom sintering;

(C) During the first smelting process, it is strictly forbidden to bury the pipe and blow oxygen;

(D) If a certain part of the bottom of the furnace is washed too much or pits appear locally, blow the pits clean with capture air, or after the molten steel is exhausted, add dry ramming materials to the pits for repair. And use the rake rod to compact and pave it, you can continue to use it.

The above is the correct operation plan for the ramming material used in the bottom of the electric furnace