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1. Medium-frequency electric furnace and Series Resonant Electric Furnace Preparatory work before firing the furnace

   
   

(1) The lining referred to—excluding asbestos—must maintain a lining thickness of at least 65–80 mm when worn.

(2) Check whether the students have developed any cracks. Cracks exceeding 3 mm should be promptly repaired by filling them with furnace lining material to ensure unobstructed cooling water flow.

2. Precautions for using an electric furnace

(1) Wet explosives must not be added. If necessary, place the dry ingredients on top of the wet ingredients and use an oven-heating method to remove the moisture before melting.

(2) The chip on the tablet should be placed after the iron residue liquid has been removed, with the furnace capacity reduced to 10% or less, and must be loaded in a uniform manner.

(3) Do not add tubular or hollow sealing materials. This is because, when the air in the sealed charge is heated, it expands rapidly, easily leading to a potentially dangerous explosion accident.

(4) Regardless of whether the final charge before the electric charge has completely melted into a charge, it is still introduced.

(5) If we use furnace charge materials that are heavily rusted or contain excessive sand, or if we add too much UYWC material during the Chinese addition process, "bridging" is likely to occur. Therefore, it is essential to frequently monitor the molten-metal level to prevent bridging. When bridging occurs, the molten iron at the lower part of the furnace will become overheated, leading to erosion of the furnace lining in the lower section and potentially even causing a furnace breakthrough accident.

3. Medium-Frequency Induction Furnace Temperature Management

In production, it is crucial not to raise the molten iron temperature beyond the required casting material temperature. Excessively high molten iron temperatures can shorten the lifespan of the furnace lining. In acidic linings, the following reaction occurs: SiO₂ + 2C = Si + 2CO. When the molten iron temperature exceeds 1500°C, this reaction proceeds rapidly, causing changes in the molten iron’s composition: carbon elements are burned away, and the silicon content increases.