电化学作用对伊利石颗粒凝聚沉降性能的影响
发布时间：2018-12-11 21:59
【摘要】：伊利石矿物是煤中主要黏土矿物之一,其遇水易泥化,泥化后形成的微细颗粒黏度大,难于沉降,给煤泥水净化回收带来困难,同时也严重影响洗选作业各环节的正常运行。因此,本文针对伊利石颗粒在水中难沉降的问题,拟采用电化学方法对其进行改性处理,研究电化学作用对伊利石类黏土矿物凝聚沉降行为的影响,探索一种解决易泥化、难沉降煤泥水的处理方法。具体研究过程为:笔者首先用氯化钙电化学体系对其进行了改性处理,并用JS94H型微电泳仪和JC2000B静滴接触角测定仪测试了不同电位梯度电化学条件下改性后伊利石的ζ电位和表面接触角,然后利用EDLVO理论计算了不同电化学条件下伊利石颗粒间的静电作用能、极性作用能和总作用能,最后用沉降试验验证了不同电化学条件下伊利石颗粒的沉降性能。研究结果表明:利用电化学改性伊利石的方法,可以有效降低伊利石颗粒间静电作用能、亲水排斥能和总作用能,进而可以较好地提高伊利石颗粒间的凝聚沉降性能,当电位梯度为2v/cm时,上清液浊度最低为294NTU,是未改性处理的34.46%;在凝聚沉降过程中,伊利石颗粒形成了"边(Edge)-面(Face)"相互吸附的网架构造,导致沉降模式为整体沉降,造成沉降速度较慢,上清液浊度总体偏大。
[Abstract]:Illite mineral is one of the main clay minerals in coal. It is easy to muddy when it comes to water, and it is difficult to settle because of its large viscosity of fine particles formed after mudding, which makes it difficult to purify and recover coal slime water, and at the same time, it seriously affects the normal operation of every link of washing and dressing operation. Therefore, aiming at the problem of difficult settlement of Illite particles in water, this paper intends to use electrochemical method to modify Illite particles, to study the effect of electrochemical action on the agglomeration sedimentation behavior of Illite clay minerals, and to explore a solution to the agglomeration of Illite clay minerals. Treatment method of difficult settling coal slime water. The specific research process is as follows: firstly, the author modified calcium chloride by electrochemical system. The Zeta potential and the surface contact angle of modified Illite under different potential gradient electrochemical conditions were measured by JS94H microelectrophoresis and JC2000B static drop contact angle tester. Then the electrostatic interaction energy, polar interaction energy and total action energy of Illite particles under different electrochemical conditions were calculated by using EDLVO theory. Finally, the sedimentation properties of Illite particles under different electrochemical conditions were verified by sedimentation test. The results show that the electrostatic interaction energy, hydrophilic exclusion energy and total interaction energy of Illite particles can be effectively reduced by electrochemical modification of Illite, and the condensing and settling properties of Illite particles can be improved. When the potential gradient is 2v/cm, the turbidity of supernatant is 294NTU, which is 34.46% unmodified. In the course of agglomeration, Illite particles formed the "edge (Edge)-plane (Face)" net structure, which resulted in the settlement model of the whole settlement, resulting in a slow settlement rate, and the turbidity of the supernatant was generally larger.
【作者单位】： 东北大学资源与土木工程学院;黑龙江科技大学矿业工程学院;郑州大学;
【基金】：黑龙江省普通高校矿物加工工程重点实验室开放课题(201307)
【分类号】：TD94
本文编号：2373295
[Abstract]:Illite mineral is one of the main clay minerals in coal. It is easy to muddy when it comes to water, and it is difficult to settle because of its large viscosity of fine particles formed after mudding, which makes it difficult to purify and recover coal slime water, and at the same time, it seriously affects the normal operation of every link of washing and dressing operation. Therefore, aiming at the problem of difficult settlement of Illite particles in water, this paper intends to use electrochemical method to modify Illite particles, to study the effect of electrochemical action on the agglomeration sedimentation behavior of Illite clay minerals, and to explore a solution to the agglomeration of Illite clay minerals. Treatment method of difficult settling coal slime water. The specific research process is as follows: firstly, the author modified calcium chloride by electrochemical system. The Zeta potential and the surface contact angle of modified Illite under different potential gradient electrochemical conditions were measured by JS94H microelectrophoresis and JC2000B static drop contact angle tester. Then the electrostatic interaction energy, polar interaction energy and total action energy of Illite particles under different electrochemical conditions were calculated by using EDLVO theory. Finally, the sedimentation properties of Illite particles under different electrochemical conditions were verified by sedimentation test. The results show that the electrostatic interaction energy, hydrophilic exclusion energy and total interaction energy of Illite particles can be effectively reduced by electrochemical modification of Illite, and the condensing and settling properties of Illite particles can be improved. When the potential gradient is 2v/cm, the turbidity of supernatant is 294NTU, which is 34.46% unmodified. In the course of agglomeration, Illite particles formed the "edge (Edge)-plane (Face)" net structure, which resulted in the settlement model of the whole settlement, resulting in a slow settlement rate, and the turbidity of the supernatant was generally larger.
【作者单位】： 东北大学资源与土木工程学院;黑龙江科技大学矿业工程学院;郑州大学;
【基金】：黑龙江省普通高校矿物加工工程重点实验室开放课题(201307)
【分类号】：TD94
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