电场辅助煤泥水沉降试验研究
发布时间：2018-08-15 15:31
【摘要】：煤炭在我国能源中所占主体地位在今后较长时期不会改变,发展煤炭洗选加工有利于煤炭的高效利用和保护环境。煤泥水的浓缩沉降在选煤工艺中占有极其重要的地位,关系到选煤厂是否能稳定运行并提供合格产品。高泥化煤泥水沉降澄清困难是选煤厂普遍存在的技术难题,开展电场辅助煤泥水沉降研究可以为煤泥水处理新技术开发提供依据,具有现实意义。 在对淮南矿区某选煤厂煤泥水性质分析测试的基础上,开展了非接触式外加电场及接触式外加电场对煤泥水沉降特性的影响规律研究,考察了电场操作条件、药剂等因素对煤泥水沉降特性的影响,初步分析了外加接触式电场辅助煤泥水沉降机理。结果表明：煤泥水中-0.045mm粒级煤泥主要为具有较强亲水性的高龄石和石英等粘土矿物,难以沉降；因为非接触式外加电场的电压大小不足以对煤泥水产生较明显的影响,电压大小、加电时间均对煤泥水沉降效果影响不大；外加接触式电场辅助煤泥水沉降时,煤泥水的pH值随电压大小、加电时间的增加而增大；由于外加接触式电场时电泳作用和电絮凝作用的共同作用,煤泥水沉降效果有所改善,电压大小为3.2kV,加电时间为30min时煤泥水获得最佳沉降效果；煤泥水中固体颗粒、各离子及水分子在电场作用下会发生极化,宏观表现为固化效应和电粘效应,会对煤泥水结构及沉降特性产生影响。开展了电絮凝法预处理对煤泥水及粘土矿物性质的影响及电絮凝法预处理与凝聚剂配合对煤泥水沉降特性的影响研究。结果表明：高岭石和石英悬浮液的Zeta电位绝对值随着pH值升高而升高；电絮凝法预处理后的煤泥水、高岭石和石英悬浮液pH值随电压大小和加电时间的增加而增大,Zeta电位绝对值由于pH值变化与阳极腐蚀所产生阳离子的共同作用而先减小到一定值然后在该值附近波动；电絮凝法与凝聚剂配合可停用聚丙烯酰胺系絮凝剂,降低凝聚剂用量。基于研究结论研发出的混凝剂发生装置,可利用选煤厂经过简单表面处理的废旧铁质部件经电腐蚀作用后产生的铁系混凝剂,废物利用,降低选煤厂生产成本。
[Abstract]:The dominant position of coal in China's energy resources will not change for a long time in the future. The development of coal washing and processing is beneficial to the efficient utilization of coal and the protection of the environment. The concentration and settlement of slime water plays an extremely important role in the coal preparation process, which is related to whether the coal preparation plant can run stably and provide qualified products. It is a common technical problem for coal preparation plant to clarify the settlement of high muddy coal slurry. The research of electric field assisted coal slurry settlement can provide the basis for the development of new technology for coal slurry treatment, which is of practical significance. Based on the analysis and test of slurry properties of a coal preparation plant in Huainan mining area, the influence of non-contact applied electric field and contact applied electric field on the settling characteristics of coal slurry was studied, and the operating conditions of electric field were investigated. Based on the influence of medicament and other factors on the settling characteristics of coal slurry, the mechanism of coal slurry subsidence assisted by external contact electric field is analyzed preliminarily. The results show that -0.045mm grain-grade slime is mainly clay minerals with strong hydrophilicity, such as aged stone and quartz, which is difficult to settle, because the voltage of non-contact applied electric field is not enough to have a more obvious effect on the slurry water. The value of pH increases with the increase of the voltage and the time of adding electricity when the electric field is applied to assist the settling of the coal slurry, and the voltage and the time of adding electricity increase with the increase of the voltage and the time of adding electricity to the coal slurry, and the pH value of the slurry increases with the increase of the voltage and the time of charging. Because of the interaction of electrophoretic and electric flocculation, the sedimentation effect of coal slime is improved, the voltage is 3.2kV, the charging time is 30min, and the settling effect of coal slime is obtained when the voltage is 3.2kV, and the solid particles in the slime water are obtained by the interaction of electrophoretic and electroflocculation. The ions and water molecules will be polarized under the action of electric field, and the macroscopical effect is the solidification effect and the electric viscosity effect, which will affect the structure and settling characteristics of the coal slime water. The effects of electroflocculation pretreatment on the properties of coal slime water and clay minerals and the effects of electroflocculation pretreatment and coagulant combination on the settling characteristics of coal slime water were studied. The results show that the absolute value of Zeta potential of kaolinite and quartz suspensions increases with the increase of pH. The absolute value of Zeta potential of kaolinite and quartz suspensions increases with the increase of voltage and charging time. The absolute value of Zeta potential decreases to a certain value first and then fluctuates around this value because of the interaction between pH value and cation produced by anodic corrosion. The flocculant of polyacrylamide system can be stopped by electroflocculation and coagulant, and the dosage of coagulant can be reduced. The coagulant generating device developed based on the research conclusion can use the ferric coagulant produced by the simple surface treatment of waste iron parts in the coal preparation plant, and the waste can be used to reduce the production cost of the coal preparation plant.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD94
本文编号：2184635
[Abstract]:The dominant position of coal in China's energy resources will not change for a long time in the future. The development of coal washing and processing is beneficial to the efficient utilization of coal and the protection of the environment. The concentration and settlement of slime water plays an extremely important role in the coal preparation process, which is related to whether the coal preparation plant can run stably and provide qualified products. It is a common technical problem for coal preparation plant to clarify the settlement of high muddy coal slurry. The research of electric field assisted coal slurry settlement can provide the basis for the development of new technology for coal slurry treatment, which is of practical significance. Based on the analysis and test of slurry properties of a coal preparation plant in Huainan mining area, the influence of non-contact applied electric field and contact applied electric field on the settling characteristics of coal slurry was studied, and the operating conditions of electric field were investigated. Based on the influence of medicament and other factors on the settling characteristics of coal slurry, the mechanism of coal slurry subsidence assisted by external contact electric field is analyzed preliminarily. The results show that -0.045mm grain-grade slime is mainly clay minerals with strong hydrophilicity, such as aged stone and quartz, which is difficult to settle, because the voltage of non-contact applied electric field is not enough to have a more obvious effect on the slurry water. The value of pH increases with the increase of the voltage and the time of adding electricity when the electric field is applied to assist the settling of the coal slurry, and the voltage and the time of adding electricity increase with the increase of the voltage and the time of adding electricity to the coal slurry, and the pH value of the slurry increases with the increase of the voltage and the time of charging. Because of the interaction of electrophoretic and electric flocculation, the sedimentation effect of coal slime is improved, the voltage is 3.2kV, the charging time is 30min, and the settling effect of coal slime is obtained when the voltage is 3.2kV, and the solid particles in the slime water are obtained by the interaction of electrophoretic and electroflocculation. The ions and water molecules will be polarized under the action of electric field, and the macroscopical effect is the solidification effect and the electric viscosity effect, which will affect the structure and settling characteristics of the coal slime water. The effects of electroflocculation pretreatment on the properties of coal slime water and clay minerals and the effects of electroflocculation pretreatment and coagulant combination on the settling characteristics of coal slime water were studied. The results show that the absolute value of Zeta potential of kaolinite and quartz suspensions increases with the increase of pH. The absolute value of Zeta potential of kaolinite and quartz suspensions increases with the increase of voltage and charging time. The absolute value of Zeta potential decreases to a certain value first and then fluctuates around this value because of the interaction between pH value and cation produced by anodic corrosion. The flocculant of polyacrylamide system can be stopped by electroflocculation and coagulant, and the dosage of coagulant can be reduced. The coagulant generating device developed based on the research conclusion can use the ferric coagulant produced by the simple surface treatment of waste iron parts in the coal preparation plant, and the waste can be used to reduce the production cost of the coal preparation plant.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD94
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