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Process For Smelting Ferrosilicon In Submerged Arc Furnace
Dec 24, 2018

Ferrosilicon is continuously produced in a submerged arc furnace, and the furnace has a fixed type and a rotary type. Rotary submerged arc furnaces have been gradually promoted due to the reduction of raw materials and electric energy consumption due to the rotation of the hearth. The furnace is mostly round, and the working layer at the bottom of the furnace and the lower part of the furnace is made of carbon brick. The upper part of the furnace is made of clay brick and self-baking electrode is used.

During smelting, the qualified silica, reducing agent and steel scrap are proportioned by electronic scale, and the good charge is poured into the hopper and sent to the top of the furnace through the belt or inclined bridge. According to the demand of the charge, The charge can be directly fed into the furnace from the feed pipe connected to the silo (or fed into the furnace by a feeder). The small furnace is usually sent to the operating platform and manually added to the furnace. The surface of the furnace mouth should maintain a certain shape. The circumference of the electrode should be a wide and flat cone shape. The height of the cone should be 200~300mm. The surface of the furnace mouth area between the three electrodes should be controlled to be higher, and the shape of the cone is better. In order to adapt to the characteristics of heat concentration and fast material in this area. Adding materials can be used in less-added or batch-concentrated feeding methods, and should be corrected in time. In order to maintain good gas permeability in the furnace, it is necessary to perform the gargle and the kiln in time. It should be made with round steel in the area where the gas permeability is poor (the fire is weak, the surface is hard), and the "thorn fire" (the furnace gas is sprayed from the electrode with a large pressure), or according to the furnace condition. The surface of the lower part of the cone and the lower part of the cone or the "thorn" area are used for the oven. Draw your eyes and work hard, according to the condition of the furnace. The small crucible furnace can be carried out according to the condition of the furnace. The large crucible furnace is generally carried out after the tapping, and the crucible furnace should be penetrated quickly, and it must have a certain depth (without destroying the crucible principle). When the molten iron in the furnace is accumulated to a certain amount, the iron preparation should be prepared. Before opening the iron, you should prepare the tools and mud balls to open and block the eyes, and check the ladle. When tapping iron, first remove the residual flood, residual iron and mud ball around the iron hole with the round steel, and then use the round steel to open the furnace eye at the center line of the furnace eye. When the iron outlet is difficult to open, The round steel can be turned on and burned. The furnace eye should be small inside and outside, and it is round. After the tap hole is opened, the iron flow should be controlled appropriately, and the tapping time should be controlled at 15 min. After the iron is discharged, the iron outlet is cleaned, and the taphole material is blocked by the plugging material. Immediately after the iron is finished, it should be poured to avoid cooling. When the ferrosilicon is condensed, the silicon first crystallizes, and because of its small density, it floats up, and the dense iron silicide sinks. The solidified ferrosilicon ingot has a high content of cassia, and the lower layer contains low silicon content, which causes segregation. In order to reduce segregation, the pouring temperature of molten iron can be reduced, the thickness of the ingot can be reduced, and the cooling speed of the ingot can be accelerated. Generally, a shallow ingot mold having a depth of less than 100 mm is used for pouring FeSi75. After the pouring, when the alloy ingot is condensed into cherry red, the alloy is lifted from the ingot mold by a crane and placed on a cooling table for cooling. The cooled alloy ingot is broken, the residue is removed, and packaged into the warehouse.

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