Induction Furnace Neutral Lining

Casting medium frequency electric furnace crucible construction, commonly known as the furnace.

Good or bad lining directly affects smelting efficiency and operating costs. Generally, the work of making furnaces in small and medium-sized foundries is completed by furnace workers. However, many furnace workers have little knowledge of refractory materials and furnace striking processes, and common sense mistakes often occur during the process of furnace striking. Resulting in the refractory lining is not durable. Therefore, it is recommended that furnace workers should learn more about refractory materials and furnace-making technology.

Medium-frequency furnace lining materials are also known as medium-frequency furnace dry vibration materials, medium-frequency furnace dry vibration materials, and medium-frequency furnace ramming materials. They are divided into induction furnace acidic lining, induction furnace neutral lining and induction furnace alkaline lining materials. Acid furnace lining materials are mainly made of high-purity quartz and molten quartz, and use composite additives as sintering agents; The induction furnace neutral lining material is mainly made of aluminum oxide and high aluminum materials, and uses composite additives as sintering agents; The basic furnace lining material uses high-purity fused corundum, high-purity fused magnesia, and high-purity spinel as the main raw materials, and uses composite additives as the sintering agent.

Alkaline furnace lining is mainly used for melting various high alloy steel, carbon steel, high manganese steel, high chromium steel, tool steel, stainless steel, and other alloy steels.

Acid furnace lining is mainly used for melting and insulating cast iron in the working furnace lining of coreless induction furnaces.

Induction furnace acid lining, induction furnace neutral lining and basic furnace lining materials are widely used in coreless intermediate frequency furnaces and cored induction furnaces. They are used as furnace lining materials for melting gray cast iron, ductile iron, and cast iron alloys, melting carbon steel, alloy steel, high manganese steel, tool steel, heat resistant steel, stainless steel, melting aluminum, and its alloys, and melting copper alloys such as red copper, brass, white copper, and bronze.

There are two methods for tying the lining of an intermediate-frequency thermal induction furnace: wet tying and dry tying. Both methods can be used for tying acidic intermediate frequency furnace lining, neutral furnace lining, and alkaline furnace lining.

Wet knotting in medium-frequency furnaces refers to the process of adding adhesives such as water, sodium silicate, and brine to the knotting material of the furnace lining. Due to the moisture content in the knotting material, there is less dust and good formability during construction. However, wet knotting also has a series of shortcomings: the lining material knotted in the medium frequency furnace is not dense enough, and the refractory degree of the furnace lining has decreased; The drying time of furnace lining is longer; When the moisture in the furnace lining is vaporized, the insulation performance of the inductor decreases. Poor handling often leads to the breakdown of inter-turn fires and may also cause short circuits to the ground. Therefore, the wet lining should be avoided as much as possible for larger smelting medium-frequency furnaces.

The dry furnace construction method is currently the most widely used in the construction of crucible induction furnaces. The dry medium frequency furnace construction method without a cementing agent can maximize the refractory performance of furnace lining materials, make the sintering layer of furnace lining thinner, thicken the powdery layer, reduce heat loss of furnace lining, reduce the tendency of furnace lining cracks, and improve the safety and reliability of furnace lining.

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