Correct choice of induction melting furnace mold and material method

The determination of the mold is an important part of the induction melting furnace . It must have high temperature resistance, insulation, heat insulation and energy transmission. It must have the ability to resist smashing and compressing pressure. In addition, it must have electrical characteristics and does not affect the magnetic field. Stirring ability. The size and depth of the mold determine the thickness of the furnace wall and the bottom of the furnace. If the mold is too large, the wall of the furnace will become thinner, and the static pressure will increase with the capacity of the crucible. The increase of the flushing force of the crucible wall will affect the furnace age, but the power factor can be improved. When the mold is too small, the wall of the furnace becomes thicker, the static pressure is correspondingly reduced with the capacity of the crucible, and the scouring force of the crucible wall is reduced, which is beneficial to prolonging the furnace age, but the electric resistance is also increased, the power factor is lowered, and the production cost is increased. . Therefore, choose the rightThe mold is very important.

In addition to the required physical and chemical indicators, the choice of the furnace charge is as small as possible, so as to avoid the occurrence of expansion cracks due to the repeated temperature difference effect, which affects the life of the crucible. It is determined by the type of equipment, the pH of the smelting material, and the temperature control during smelting. At present, the domestic building materials of induction melting furnaces mostly use quartz sand and high alumina soil. High alumina materials are more responsive to lower the induction melting furnace , induction melting furnace crucible production, the use of dry quartz sand, quartz sand materials most appropriate. Quartz sand material is selected from natural ore, and its quality depends mainly on the level of SiO2 and its particle size formula. Changing the size of the crucible can increase the age of the crucible, and the acid crucible is made of an acid oxide. The oxide used to make the acid ruthenium is mainly SiO2. Almost all of the acid bismuth is made of SiO2-based refractory material, which is especially suitable for large-scale induction melting furnaces with capacity . Through experiments, the first type of expansion index of quartz sand physicochemical index is 7% to 9%, the second type is 0.5% to 2%, and the second type and particle size are suitable.

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