(1) Pretreatment of iron filings or chips may contain moisture and grease brought in during processing before recycling. If untreated, the smog will diffuse in the early stage of furnace and smelting, and the molten iron will absorb a large amount of gas, which will lead to iron in the liquid. The increase in gas content not only affects the quality of the casting, but also the gas will diffuse into the furnace lining during the smelting process, which may cause damage to the induction coil.

Therefore, green recycling of iron filings should first be pretreated. Under normal circumstances, the pretreatment process first removes the grease brought in during the processing by the deoiler; for the iron filings with the cutting fluid, it can also directly use the roasting treatment to remove the moisture brought by the cutting fluid during the processing. And fat. After the centrifugal dewetting process and the rapid drying process, the moisture content is reduced to less than 1%.

(2) The pressed cast iron chips are the scraps for the cutting of cast iron parts. The broken shape of the cast iron contains a thin layer of iron oxide, the natural bulk density is about 2g/cm3, the relative magnetic permeability is about 1.6, and the permeability of air The rate is close. The relative magnetic permeability of the massive cast iron is about 600 to 1000. In order to increase the magnetic permeability of the incoming charge, it is necessary to increase the overall density of the cast iron. After repeated trials and comparison data, the density of the chip cake can reach 5.2g/cm3, the relative magnetic permeability of the chip cake is increased to more than 300, and the overall magnetic permeability of the chilled state (<700 °C) after the furnace is entered. Significantly increased, compared with the direct filling of cast iron chips, the cold electromagnetic heating efficiency is obviously improved. Based on the corresponding analysis and calculation, a special chip cake machine is independently developed by using 3000kN hydraulic press and supporting molds, and the cast iron chips are formed by pressure into Chip cake mass.

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