Since the beginning of trial production, the intermediate frequency furnace has been used for two furnace ages. Through the use of one furnace age and two furnace age ovens and the production of the first few furnaces, combined with the experience of furnace lining suppliers and some other domestic manufacturers in the use of neutral lining, the furnace charge manufacturers summarize the following comments:

       1. The dry ramming material is alumina gel bonded, and the powder lining material is composed of corundum, magnesia and spinel mixed with a certain particle ratio; The material is characterized by high melting point; High pressure resistance after sintering; After sintering, the sintering layer, hardening layer and loose layer are formed. High sintering temperature (1650℃); The disadvantage is that the lining needs to be baked under the support; Poor corrosion resistance to MnO and acid slag; The compatibility of the charge is poor, and the gap between other materials is easy to produce, and it is easy to drill cold steel.

       Second, from the current use of the point of view, after the dry ramming material sintering, there is about 10mm sintering layer, about 30mm hardening layer. Compared with the use of domestic manufacturers, the sintering layer we use is thin (some domestic manufacturers analyze the sintering layer in 15-20mm, the hardening layer in 25-35mm). Analysis of the reason: in the high temperature holding time is short.

The above information is provided by the charging material manufacturer

       At present, there are several situations in our use that have a great impact on our furnace lining material consumption and furnace age:

       1. There is no sintering layer in the upper part of the furnace, and it is not sintered about 150mm below the furnace platform after drying, resulting in serious damage to the upper part of the furnace and a large amount of repair in production.

       2. When aniseed is used in production, the material is rushed to feed, resulting in aniseed rolling and scraping the furnace wall.

       3. More times of pressing, resulting in increased pressure on the furnace wall.

       4. For cold steel, the use of forced means in residue treatment causes damage to the furnace mouth and furnace wall.

       4. Comparing the use of neutral lining materials by other domestic manufacturers and our use, I think the following improvements need to be made:

       1, the oven charge must be required, the need for uniform medium and small materials, the oven cloth to support the steel pot liner; The inner liner of the steel pot should be made of 8-10mm steel plate to ensure that the charge is not loose in the early melting stage of the oven. It is better to fill the gap evenly in the oven, and should not use angular and large materials to avoid scratching the furnace wall when cutting.

       2, the oven began to gradually feed the process to carefully guard, found that the furnace and steel pot fire timely treatment, should try to make the steel pot in the molten steel in place before not melting.

       3, the furnace as far as possible to make the molten steel position close to the furnace platform, to facilitate the optimization of the sintering layer, as far as possible to the formation of the sintering layer of the upper furnace wall, to prevent the sand drop when the residual steel pan is not sintered. The holding temperature time after melting in the oven should meet the requirements to increase the thickness of the sintering layer.

Charge manufacturers remind you: try to use less slag, relatively clean scrap, slag when the amount of slag is large. Minimize soaking time in the production of steel with higher Mn content. Pay attention to the power supply curve of the cold furnace in order to bridge the cracks. Repair should be fine, as far as possible to bridge between the two materials.