Converter self-flow repairing material made from fused magnesia with organic binders features excellent hot-state self-flowing, fast sintering, high bonding strength and low fume, ideal for hot repair of converter large face, trunnion and taphole surroundings.
| MgO content | ≥ 76% |
|---|---|
| SiO2 content | ≤ 2.5% |
| CaO content | ≤ 3.0% |
| C content | 4%～6% |
| Bulk density | ≥ 2.5 g/cm³ |
| CCS (1400℃×3h) | ≥ 25 MPa |
| Refractoriness | ≥ 1800℃ |
| Service temperature | ≥ 1700℃ |
Converter self-flow repairing material (converter bulk repair mix) is a high-magnesia unshaped refractory made from quality fused magnesia, high-purity magnesia and magnesia-calcia sand, hot-mixed with organic binders, wetting agents and sintering aids. Its outstanding feature is excellent hot-state self-flowing behaviour: when charged into the furnace at high temperature, the material flows and spreads by itself to trunnion, large face and taphole surroundings where direct bricklaying is difficult, and rapidly sinters into a dense repair layer bonding firmly with the residual lining. Compared with manual patching, self-flow repair material gives more even coverage, shorter downtime and faster furnace recovery, making it the core material for daily converter maintenance and campaign extension.
The large face and trunnion zones have limited tilting angles, making manual charging uneven. Self-flow material has low viscosity at high temperature, flows and spreads by itself to fill pits and irregular areas for even repair.
Generally 10-30 minutes of sintering (depending on layer thickness and furnace temperature), guided by furnace condition, minimizing non-productive time.
Large-face self-flow material is used for bulk charging on the large face and trunnion, forming by self-weight flow; gunning material is sprayed at high speed by a gunning machine for local thin patching and fast forming. They are used together to cover different maintenance needs.
Yes. Henan Songrui New Refractory Materials Co., Ltd. supplies grades with MgO 76%-82%, selected by furnace type, slag system and erosion condition.
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