Method for smelting industrial silicon in induction melting furnace
A method for smelting industrial silicon using an induction melting furnace is characterized by comprising the following steps: Building a furnace: adding 55 parts of corundum particles of 1 mm to 3 mm, 40 parts of a corundum powder, 1 part of brazing element, 2 parts of dextrin, After mixing 1 part of acid cement and 1 part of refractory soil evenly, stir according to 4•5~5•5kg/100kg of water to obtain the corundum injection; use high temperature resistant mica paper to lay the induction coil coated with insulating mortar At the bottom of the furnace body of the induction melting furnace, pour the corundum castable and use the vibrating rod to knot the bottom of the furnace after the laying is completed. After the bottom knot is determined according to the depth of the furnace, the mold with corrugated paper wrapped on the surface is installed in the furnace. After finishing the fixation, the corundum castable is burnt into the gap between the furnace wall and the mold wrapped with corrugated paper and knotted. When the knot is tied, a vibrating rod is used to vibrate the corundum castable. Exhaust the gas in the corundum castable, each rapping time is 2~8 minutes; dry in the shade at room temperature 20~35 °C for 24 hours, take out the corrugated paper mold, and the corundum in the furnace body of the induction melting furnace The melting crucible is formed, and the melting crucible is baked according to the following baking process; the resistance heating rod is used for baking below 260 °C; the graphite electrode is used for heating when the temperature is above 260 °C, and the temperature reaches 1200 °C after 3 hours of heat preservation Feeding; Smelting: Put a predetermined amount of silicon material into the furnace to melt, and when the silicon material in the melting crucible shows signs of melting or silicon liquid penetrates the upper surface of the material, remove the graphite electrode in the furnace; when the predetermined amount of silicon material is put in After being completely melted, slag washing and smelting are carried out. The slag washing slag materials are silicon dioxide and sodium carbonate. After the two materials are mixed uniformly at a ratio of 1:1, the quality of the slag washing slag material is the same as the quality of the predetermined amount of silicon material. The ratio is 1:3, put into the furnace in order to melt, after 30 minutes after the melting is completed, use the slag chucking tool to remove the slag liquid on the surface of the silicon liquid. Repeat 3 to 5 times, and then the silicon liquid is introduced into the ladle and then discharged after cooling. Obtain industrial silicon. The method for smelting industrial silicon using an induction melting furnace is characterized in that it further includes the following steps: After the first furnace is smelted, half of the silicon liquid in the furnace is poured out, and the remaining materials in the furnace are used as the heat source for the next furnace. This is smelted according to the above smelting steps.
