Proper operation plan for the use of ramming mass on the bottom of an electric furnace

The quality and life of the ramming material used for the bottom of the electric furnace are more important to the operation and smelting effect of the electric furnace. At present, MgO-CaO-Fe2O3 dry ramming material is widely used as the bottom material in foreign countries, and they use high-calcium and high-iron magnesite as the raw material. , It is fired and crushed at high temperature (2250 degrees Celsius). This material has high temperature resistance, corrosion resistance, erosion resistance, rapid sintering, high toughness, and is not easy to float. The effect is very good. Today, Xiaobian belt You understand the correct operation method of using ramming material for electric furnace bottom:

(1) According to the size of the furnace bottom, prepare enough ramming materials, damp materials are not allowed to be used, and foreign objects are not allowed to be mixed;

(2) 5 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 carried out on the original bottom layer, the bottom layer needs to be cleaned to expose the bricks and remove the surface residues;

(3) The total thickness of the knot is 300mm, and the knot is divided into 2 layers, each layer is about 150mm thick, hit with a hammer or step into a pot bottom shape;

(4) After the first layer of ramming is finished, use a rake to rake out the "cross" and "X"-shaped grooves with a depth of about 20mm, and then put in another layer of ramming material to step on or tamp the two layers. can be better separated (pay special attention to solidify the edges);

(5) After knotting, use a steel rod with a diameter of about 4mm to apply a pressure of 10Kg to insert, and its depth does not exceed 30mm to be qualified;

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

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

Maintenance method:

(1) When smelting at the beginning of the first furnace, first use light and thin scrap steel to lay the furnace bottom to minimize the impact of adding scrap steel. It is strictly prohibited to use heavy scrap steel to impact the furnace bottom, and the two batches of scrap steel before smelting do not blow oxygen to allow it to condense naturally. , the temperature of power transmission should not be too fast, and the furnace should be stopped according to the situation;

(2) The first three furnaces adopt the operation of leaving molten steel to facilitate furnace bottom sintering;

(3) When smelting at the beginning of the first furnace, it is strictly forbidden to bury the pipe and blow oxygen;

(4) If a certain part of the furnace bottom is washed too much or some pits appear, blow out the pits with compressed air, or add dry ramming material to the pits to repair after the molten steel is removed. And use the rake bar to compact it, pave it flat, and then continue to use it.