Views: 31 Author: Site Editor Publish Time: 2021-12-22 Origin: Site
Ferrosilicon furnace is an industrial electric furnace with large power consumption, which belongs to submerged arc furnace. Ferrosilicon furnace is composed of furnace shell, furnace cover, furnace lining, short net, water cooling system, smoke exhaust system, dust removal system, electrode shell, electrode pressure release and lifting system, loading and unloading system, controller, burnthrough, hydraulic system, transformer and various electrical equipment. Refractory materials are also relatively harsh.
Ferrosilicon furnace mainly produces ferrosilicon, ferromanganese, ferrochromium, ferrotungsten and silicon manganese alloy. The production form is continuous feeding and intermittent iron slag discharge. It is an industrial electric furnace with continuous operation.
Ferrosilicon furnace is a type of high energy consumption furnace, which can reduce energy consumption, improve output and prolong the service life of the furnace. Only in this way can the production cost of enterprises be reduced and the emission of waste residue pollutants be reduced. The following describes the different reaction temperatures of ferrosilicon furnace, and the use schemes of refractories with different materials are for reference only.
New material preheating area: the top layer is about 500mm, and the temperature is 500 ℃ - 1000 ℃. The high-temperature air flow, electrode heat conduction, surface charge combustion and charge distribution current resistance heat. The temperature of this part is different, and the clay brick is used as the lining.
Preheating zone: the furnace charge will gradually drop down after water evaporation, and make preliminary changes in the preheating zone. Silica crystal form will change, volume will expand, and then crack or burst will occur. The temperature in this section is about 1300 ℃. Masonry with high alumina bricks.
Sintering area: it is the crucible shell. The temperature is 1500 ℃ - 1700 ℃. Liquid silicon and iron are generated and dropped into the molten pool. The sintering and air permeability of the furnace charge is poor. The block should be broken to restore gas ventilation and increase resistance. This area has high temperature and high corrosiveness. It is built with semi graphite carbon carbonized silica brick.
Reduction area: a large number of intense material chemical reaction areas. The temperature of crucible area is 1750 ℃ - 2000 ℃. The lower part is connected by arc cavity, mainly including the decomposition of SiC, the formation of ferrosilicon, the reaction of liquid Si2O with C and Si, etc. The high-temperature area must be built with semi graphite roasted carbon bricks.
Arc area: the temperature in the cavity area at the bottom of the electrode is above 2000 ℃. This area is the highest temperature area of the whole furnace and the source of the most temperature distribution of the whole furnace body. Therefore, when the electrode is inserted shallow, the high temperature area moves upward, the furnace bottom temperature is low, and the molten slag is removed less, forming a false furnace bottom, resulting in the upward movement of the taphole. A certain false furnace bottom is good for furnace protection. Generally speaking, the insertion depth of the electrode is closely related to the diameter of the electrode. Generally, the insertion depth should be kept at an extreme distance of 400mm-500mm from the furnace bottom. This part has a higher temperature and is built with semi graphite roasted carbon brick.
Phosphate concrete or clay brick shall be used for permanent layer. The furnace door can be poured with corundum castable or pre built with silicon carbide brick.
In short, appropriate, environmental friendly and different materials of refractory bricks and castables shall be selected as the lining according to the size, temperature and erosion degree of ferrosilicon furnace.