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Silico-aluminum-iron alloy is one of the more difficult types of smelting in iron alloys. In the configuration of smelting silicon-aluminum-iron alloy ore furnace lining, aluminum refractory bricks are mainly used, preferably high-aluminum brick masonry. Three layers of graphite carbon bricks are built on the bottom of the furnace, and one layer of graphite carbon bricks is built on the furnace wall. Before the furnace was opened, the bottom of the furnace was knotted with a layer of electrode paste with an average thickness of 200 mm.
Before the operation of the submerged arc furnace, it is necessary to bake the lining of the refractory material. The purpose is to help the water inside the lining to be discharged, so that it can exert better performance.
1, wood drying
The main purpose of wood drying is to dry the moisture of the furnace and to perform preliminary baking on the electrode. Compared with coke bake and electric bake, the bake baking area is large but the temperature is low, so the time is long, generally lasting 3 to 5 days. Before the wood is baked, the electrodes are padded with refractory bricks to prevent sticking. At the beginning of the wood-baked baking, the flame height does not exceed the mouth of the furnace, and the electrode is baked with a large fire in the later stage to make the fire of the fire evenly and violently.
2, coke bake
Before the coke bake, a circle of clay bricks is used around the electrodes to hold the coke, which is slightly lower than the mouth of the furnace. A layer of 100 mm thick coke breeze is placed on the bottom of the furnace to prevent oxidation of the bottom of the furnace. During the coke bake process, the electrode paste melt condition, the electrode paste height, the electrode shell shape change, and the volatile matter escape condition are often observed. During the baking process, the height of the electrode paste should be consistent at all times, and the electrode paste is prevented from being completely melted by adjusting the cooling water. The coke bake time is about 30h.
3, electric baking
Check all kinds of equipment before electric baking, and quickly clean up the burnt ash and clay bricks. Raise the electrode and place 200mm thick coke on the bottom of the furnace and lower the electrode arc. The electric baking time is 25~40h, and the current should be gradually increased to 50%~60% of the normal smelting current during electric baking. In the early stage, power failure should be 5~10min every 2h, and power loss should be 10~15min every 3~4h later. After each power outage, carefully check the operation of the waterway and equipment. After the end, clean the oven coke quickly. A small amount of coke is pushed around the electrode, put down the electrode, add some new coke arc, and wait until the arc is stable.
After the above oven process is completed, it is possible to gradually feed the furnace and officially operate the submerged arc furnace.
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