(1. Iron and Steel Technology Research Institute, Research Institute of Technology, Shougang Group Corporation, Beijing 100043, China;2. Laboratory of Green Recyclable Process for Iron and Steel Production Technology, Beijing 100043, China;3. Steelmaking Department, Shougang Jingtang United Iron and Steel Co., Ltd., Tangshan 063200, Hebei, China)
The freeopening rate of the 300 t ladle in Shougang Jingtang was obviously reduced after covering. The mechanism of the decrease of the freeopening rate of the covered ladle was analyzed, and it determined that the main reason was the liquid slag backflow caused by the increase of the lining temperature. By studying the fluidity, density and steel penetration of the stuffing sand, a proportion of the stuffing sand suitable for the covered ladle was designed, and the purity of the chromite sand was ensured by controlling the content of Al2O3 and MgO. The hot repair process of ladle had been improved, and the feeding pattern of sand and the measures of avoiding slag backflow for the covered ladle had been designed. After the research results were promoted and used, the number of ladles not free opened was reduced from 89 heats to less than 2 heats. The comprehensive freeopening rate was 99.9%, and the duplex process freeopening rate was 100%.
钟凯，王崇，张启东，崔园园. 提高加盖钢包自开率的研究与实践[J]. 中国冶金, 2019, 29(3): 36-42.
ZHONG Kai,WANG Chong,ZHANG Qidong,CUI Yuanyuan. Research and practice on improving freeopening rate of covered ladle[J]. China Metallurgy, 2019, 29(3): 36-42.
2019, Vol. 29 
