Characteristics of coal sludge slurry prepared by a wet-grinding process |
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| Affiliation: | 1. School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou 221116, China;2. Ministry of Education’s Key Lab of Coal Processing and High Efficient Clean Utilization, Xuzhou 221116, China;3. Advanced Analysis and Computation Center, China University of Mining & Technology, Xuzhou 221116, China;4. School of Resources and Geosciences, China University of Mining & Technology, Xuzhou 221116, China;1. School of Mechanics and Architecture Engineering, China University of Mining & Technology, Beijing 100083, China;2. State Key Laboratory for Geomechnics & Deep Underground Engineering, Beijing 100083, China;1. State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China;2. School of Mechanics & Civil Engineering, China University of Mining & Technology, Xuzhou 221116, China;1. Key Laboratory of Ministry of Education for Mine Disaster Prevention and Control, Shandong University of Science & Technology, Qingdao 266590, China;2. College of Mining & Safety Engineering, Shandong University of Science & Technology, Qingdao 266590, China;3. Department of Mining Engineering, Colorado School of Mines, CO 80402, USA;1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;2. State Key Laboratory of Coal Resources and Safety Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, China |
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| Abstract: | Coal sludge slurry(CSS) is an alternative fuel and a potential competitive method for sludge reduction.Based on the researches of coal water slurry, we studied CSSs by using a wet-grinding process with different types of regional municipal sludge(sludge) in an orthogonal experiment. The sludge type,sludge mixing proportion, dosage of dispersant, and grinding time were tested in this study. The results show that water content and its occurrence characteristics in the sludge have primary hindering influences on slurry ability. The range of fixed-viscosity concentrations with raw wet sludge is from 50.78%to 44.40%(by weight), while the range is from 53.35% to 51.51%(by weight) with dry sludge. All of the CSSs exhibit shear-thinning behaviors with different variation trends, especially the CSSs with more than 15%(by weight) raw wet sludge in it. Adding the same proportion of raw wet sludge increases the thixotropic properties of CSSs and the highest area of thixotropy loop is 3065 Pa/s, while the highest value of dry sludge is 1798 Pa/s. Hydrophilic group plays an important role in adsorbing water and building three-dimension networks with other particles, which is the main reason for CSS properties.Therefore, the mechanism can be used to find the way for making high quality CSS. |
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| Keywords: | Coal sludge slurry Municipal sludge Wet-grinding process Fixed-viscosity concentration Hydrophilic groups |
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