烧结白云石砖转炉炉衬碱性耐火砖｜Dolomite Refractory Brick Sintered
中文部分
老樊听到客户问烧结白云石砖在转炉炉衬中的应用，我先说个现实：转炉炉衬碱性耐火材料的选型，不是一纸标准就能决定的。炼钢工况千差万别，炉衬设计的细节更是决定性因素。烧结白云石砖（Dolomite Refractory Brick Sintered）在高温下的碱性耐蚀性和机械强度，确实在某些工况下是转炉炉衬的“金标准”，但也要看实际使用环境。
关键选型点：
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工况匹配
烧结白云石砖适用于转炉炉底、炉壁下部、吹氧口附近等高碱性渣环境。数据显示，炼钢厂中，白云石砖在炉底使用寿命通常在100-150次循环（钢包装车次），但炉壁下部因温度应力和碱性渣侵蚀，寿命通常在50-80次。如果炉衬设计不合理，比如水冷套管不足，白云石砖会因为热冲击而开裂。老樊经常看到，炉底烧结白云石砖“过热”导致的裂纹，实际上是水冷系统设计不合理造成的。 -
踩坑经验
我曾见过一家钢厂用烧结白云石砖替换了高铝砖，结果炉壁下部出现“白云石化”现象——即碱性渣与白云石反应生成碳酸钙，导致结构松散，强度下降。这说明，即使是烧结白云石砖，也要注意渣的碱度（通常控制在pH值8-9之间），否则会加速侵蚀。工厂落地时，要检查渣线位置是否与砖体接触紧密，避免渣线“漂移”。 -
工厂落地建议
对于新建转炉，建议采用烧结白云石砖 水冷套管的组合设计。水冷套管的间距应根据炉衬厚度和炉体温度分布精确计算，避免“冷点”形成。老樊的建议是：炉底水冷套管间距控制在150-200mm，炉壁下部水冷套管间距控制在100-150mm。炉衬砖的排列要精确，避免“空隙”形成渣线“漏渣”现象。
English Section
Sintered Dolomite Refractory Brick for Blast Furnace Lining
Old Master Wang heard from customers about the application of sintered dolomite bricks in blast furnace linings, and I’ll start with reality: selecting alkaline refractory materials for blast furnace linings isn’t just about following a standard. The steelmaking conditions vary widely, and even the smallest details in lining design are critical. Sintered dolomite bricks (Sintered Dolomite Refractory Brick) indeed excel in high-temperature alkaline corrosion resistance and mechanical strength in certain scenarios, but their suitability depends on actual operating environments.
Key Selection Points:
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Operating Condition Matching
Sintered dolomite bricks are suitable for the bottom, lower wall sections, and areas near the oxygen blow nozzles in blast furnaces under high alkaline slag conditions. Data shows that in steelmaking plants, dolomite bricks used in the furnace bottom last about 100-150 cycles (per steel ladle pass), but their lifespan in the lower wall section, due to thermal stress and alkaline slag erosion, typically ranges from 50 to 80 cycles. If the lining design is flawed—such as insufficient water-cooling jackets—thermal shock can cause cracking. I’ve often seen cracks in the bottom dolomite bricks caused by poor water-cooling system design. -
Common Pitfalls
I’ve witnessed a steel plant replace high-alumina bricks with sintered dolomite bricks, only to face “dolomitization” issues—alkaline slag reacting with dolomite to form calcium carbonate, leading to structural loosening and strength loss. This highlights that even sintered dolomite bricks require attention to slag alkalinity (typically controlled between pH 8-9). Otherwise, erosion accelerates. In practice, check if the slag line is in tight contact with the brick to prevent “slag line drift.” -
Practical Recommendations for Plant Implementation
For new blast furnaces, I recommend a combination design of sintered dolomace bricks water-cooling jackets. The spacing of water-cooling jackets should be calculated based on lining thickness and furnace temperature distribution to avoid “cold spots.” My advice is to set the water-cooling jacket spacing at 150-200 mm for the furnace bottom and 100-150 mm for the lower wall section. Additionally, ensure precise brick arrangement to avoid gaps that could lead to slag leakage.
