Preparation and Rheology of Coal Water Slurry Blended with Blast Furnace Sludge
GAO Zhi-fang LI Liao-sha WU Zhao-jun WU Xing-rong SU Shi-huai WU Xiao-hua
Anhui University of Technology, Anhui Provincial Key Lab of Metallurgy Engineering ＆Resources Recyclin Anhui Provincial Key Laboratory of Metallurgy Engineering ﹠ Resources Recycling, Anhui University of Technology Anhui Key Laboratory of Metallurgical Engineering & Resources Recycling, Anhui University of Technology Anhui Key Laboratory of Metallurgical Engineering & Resources Recycling, Anhui University of Technology Maanshan Iron and Steel Co.,Ltd. Institute of Policy and Management, Chinese Academy of Sciences
Abstract：Blast furnace sludge (BFS) from Ma￠anshan Iron and Steel Co., Ltd. was added in Dongkai fat coal to prepare coal water slurry. Based on the analysis of physicochemical properties of BFS and fat coal, the apparent viscosity, concentration, caloric value of coal water slurry with addition of BFS were examined, and the effect of BFS was analyzed by regression method. The results show that the viscosity of coal water slurry is decreased and its slurrying ability enhanced with the increase of BFS addition, whereas, the slurrying stability and caloric value are decreased. The main mechanism is that lots of alkaline oxides in BFS lead to soluble ion dissolution with changing of the pH value of coal water slurry. The relative content of soluble and insoluble minerals, which affect the density of coal, is also a key factor for the slurrying ability. When the addition of BFS is 24%, the slurrying ability and caloric value of coal water slurry can meet industrial requirements.