How to choose the material of furnace lining

Cast iron melting and heat preservation furnace linings used to melt cast iron mostly using power frequency induction furnaces. In recent years, due to the advantages of intermediate frequency and variable frequency induction melting furnaces, the high efficiency and energy saving. In the newly installed cast iron induction furnaces, frequency conversion furnaces and intermediate frequency furnaces account for a considerable proportion.

1. For cast iron induction furnaceFurnace lining\u003Ci>一般选用酸性的石英质捣打料.国内大都采用廉价的天然石英质捣打料.天然石英在使用中虽然会因为si 的晶型改变会发生急剧膨胀,石英的晶型改变是不可逆的,冷却时会保存下来．\u003C\/i> \u003Cb>Acidic quartz ramming materials are generally used. In China, cheap natural quartz ramming materials are mostly used. Although natural quartz will undergo rapid expansion due to the change of the crystal form of Si, the crystal form of quartz will be irreversible. will be saved.\u003C\/b>\u003Ci>因而炉衬热面不易发生裂纹,可以获得安稳可靠的使用寿命.可是因为si 的热膨胀系数较大,抗热冲击功能差．\u003C\/i> \u003Cb>Therefore, the hot surface of the furnace lining is not prone to cracks, and a stable and reliable service life can be obtained. However, because the thermal expansion coefficient of si is large, the thermal shock resistance is poor.\u003C\/b>\u003Ci>使用时要求炉子不能倒空．\u003C\/i> \u003Cb>When using it, the stove must not be emptied.\u003C\/b>\u003Ci>连续操作较为抱负.目前国内容量大于10t用于铸铁连续熔化的炉衬使用寿命为40-90天,容量小的炉子炉衬使用寿命将更长.\u003C\/i> \u003Cb>Continuous operation is more ideal. At present, the service life of domestic furnace linings with a capacity of more than 10t for continuous casting of cast iron is 40-90 days, and the service life of furnace linings with small capacity will be longer.\u003C\/b>

2. It is worth noting that not SiO2gt; 98% quartz sand can be used as the lining of the induction furnace, the important thing is the size of the quartz grains, the coarser the grains, the less lattice defects the better. Mainly for foundry refractory materials Targeted supply of internal refractory materials for enterprises. Among them, the acid lining material is quartz coreless induction furnace refractory material, and the raw material is acidic. On the basis of siliceous ramming material, part of fused silica is added, which significantly improves the furnace lining. Disadvantages of expansion. The rise of the furnace lining decreases significantly during the oven, and the larger the capacity of the crack-free furnace in the cold furnace, the higher the requirements for grains.

\u003Ci>3.该捣打料用于500kg-lot的炉子,炉衬寿命通常为250-450炉次左右,20t炉子的使用寿命达300炉次.在国外,熔融石英用于铸铁感应炉比较多见.与天然石英质捣打料相比,熔融石英捣打料具有热膨胀系数小,抗热冲击性能优的特点,同时克服了天然石英在长期使用过程中烧结层较厚甚至烧透的现象,保留了足够厚的未烧结层．\u003C\/i> \u003Cb>3. The ramming material is used in a 500kg-lot furnace, the lining life is usually about 250-450 heats, and the service life of a 20t furnace is 300 heats. In foreign countries, fused silica is more commonly used in cast iron induction furnaces. Compared with the natural quartz ramming material, the fused silica ramming material has the characteristics of small thermal expansion coefficient and excellent thermal shock resistance. Thick unsintered layer.\u003C\/b>\u003Ci>避免裂纹穿透,确保炉子安全稳定地运行.据报道,该捣打料用于500kg-lot的炉子,炉衬寿命通常为250-450炉次左右,20t炉子的使用寿命达300炉次.\u003C\/i> \u003Cb>Avoid crack penetration and ensure safe and stable operation of the furnace. It is reported that the ramming material is used in a 500kg-lot furnace, the lining life is usually about 250-450 heats, and the service life of a 20t furnace is up to 300 heats.\u003C\/b>