长寿高炉炉缸保护层综合调控技术

 在高炉炉缸砖衬热面形成的稳定的保护层，将铁水与砖衬隔离开，避免直接接触，这是保证高炉炉缸长寿、延缓砖衬侵蚀的必要条件。为了研究高炉炉缸长寿的本质，首先通过高炉破损调查和解剖调研，分析了炉缸保护层的物相组成和显微结构，建立了高炉炉缸保护层类别体系。从保护层形成机制的角度将保护层分为富铁层、富渣层、富石墨碳层和富钛层。制定了高炉炉缸保护层综合调控技术路线，提出高炉炉缸保护层能否形成的关键在于合理控制炉缸耐火材料热面温度和铁水成分。最后明确，在高炉正常生产过程中，应从设计、铁水质量、生产操作等3个方面采取措施以促进保护层的有效形成。

Comprehensive regulation technology for hearth protective layer of blast furnace longevity

A stable protective layer forming in brick heating surface of blast furnace hearth， which avoided direct contact by seperating molten iron with brick， was a necessary condition to keep the longevity of hearth and delay the corrosion of brick. In order to study the essence of blast furnace hearth longevity. Firstly， class system of blast furnace hearth protective layer was established through blast furnace damage surveys and dissection research， and also by analyzing hearth protective layer phase composition and microstructure. Protective layer was classified as iron-rich layer， slag-rich layer， graphite-rich layer and titanium-rich layer according to the formation mechanism of protective layer. Secondly， the technical design of comprehensive regulation of the blast furnace hearth protective layer was formulated. And it was also proposed that reasonable control of the hearth refractories heating surface temperature and hot metal composition was the key to form hearth protective layer. The strength of the formation ability of hearth protective layer decreased from titanium-rich layer and graphite-rich layer toiron-rich layer.At last， it was clear that the measures of design， control of hot metal and production oprations should be taken to promote the formatin of graphite-rich layer during blast furnace production.