Refractories used in intermediate frequency furnaces are mostly dry, such as dry ramming materials, also called knotting materials. According to their chemical properties, refractory materials include neutral, alkaline and acidic materials. Induction furnaces, etc., select suitable refractory materials according to the characteristics of the furnace and the environment.
For the lining of the intermediate frequency furnace for melting cast iron, generally cheaper quartz sand is used as the knotting material. When the smelting temperature is high and the smelting conditions are relatively harsh, the service life of the quartz sand knotting material will be greatly reduced, which cannot meet the user's requirements. At this time, it is necessary to use dry knotting materials such as magnesia, magnesia aluminum, magnesia chromium, etc. (that is, the alkaline lining material that everyone often calls).What are the common molding methods for refractory materials:
There are many molding methods for refractory materials. Common molding methods include extrusion molding, vibration molding, extrusion molding, ramming molding, isostatic pressing molding, melting casting molding, grouting molding, etc. The choice of forming method is mainly based on the nature of the mud, the shape, size and other process requirements of the embryo body. Except for the fact that most refractory materials are formed by press forming and vibration forming is used to form large shaped blanks. Extrusion molding is generally used For the forming of tubular blanks, grouting is generally used for forming hollow thin-walled blanks. Isostatic pressing is currently mainly used in the production of high-performance refractories.
Of course, the choice of molding method is also restricted by the equipment conditions of the production plant, so some products can't use the molding method. In this case, the company should choose other more suitable molding methods on the premise of meeting the technical requirements of the product.
1. The sand should be manufactured according to the regular particle size and mixed evenly with additives. If you choose wet knotting, you can add 1% to 2% of the water, mix and put it for 1 to 2 hours before use.
2. Spread asbestos cloth on the inside of the sensor.
3. Knotted at the bottom of the furnace. After adding the sand material in batches, repeat the tamping with a pointed steel drill with a diameter of 12 to 14 mm each time. The furnace bottom knotting and feeding times are 4 to 5 times. The thickness of the furnace bottom is generally knotted to a regular height, and each knotting time is at least 10 minutes.
4. Put in the crucible core, which is the mould that controls the shape and volume of the crucible.
5. Knotted at the furnace mouth.
3. Knotted at the bottom of the furnace. After adding the sand material in batches, repeat the tamping with a pointed steel drill with a diameter of 12 to 14 mm each time. The furnace bottom knotting and feeding times are 4 to 5 times. The thickness of the furnace bottom is generally knotted to a regular height, and each knotting time is at least 10 minutes.
4. Put in the crucible core, which is the mould that controls the shape and volume of the crucible.
5. Knotted at the furnace mouth.
Article Source:Development of VOD ladle lining refractories
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: info@cxrefractories.com
Website:http://www.cxrefractories.com
没有评论:
发表评论