1. Research Institute of Technology, Shougang Group Co., Ltd., Beijing 100043, China; 2. Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology, Beijing 100041, China; 3. Qianshun Technology Center, Beijing Shougang Co., Ltd., Qian'an 064404, Hebei, China
Abstract：Blast furnace hearth safety is the main limiting link of blast furnace longevity. Shougang Co., Ltd. carried out protective cleaning and pouring repairing of No.2 blast furnace without cutting the furnace shell during the environmental protection period. At the same time, the damage of blast furnace hearth was investigated. The condition for slag skin of hearth below tuyere, tuyere area, mud pack in front of taphole and the erosion status of ceramic mat at the bottom of No.2 blast furnace in Shougang Co., Ltd. were studied. The causes for erosion of carbon bricks and the phase of titanium and zinc in the hearth were analyzed. It was found that the ceramic pad at the bottom of furnace did not form pot bottom erosion, and the closer to furnace wall the more serious for erosion. This indicated that the hearth activity was not enough. The erosion of carbon brick in elephant foot area was mainly caused by permeated erosion of elements such as iron, potassium and sulfur. The large amount of bronze titanium carbonitride deposits were found in the elephant foot area at the bottom of furnace, and the deposits distributed in strips. The large amount of ZnO enrichment found in the damaged hearth was yellow green rather than traditional white. The damage investigation provides a realistic and reliable basis for later hearth pouring, blast furnace operation and future hearth design, which has the great significance.
2021, Vol. 31 
