電化學作用對伊利石顆粒凝聚沉降性能的影響
發(fā)布時間：2018-12-11 21:59
【摘要】：伊利石礦物是煤中主要黏土礦物之一,其遇水易泥化,泥化后形成的微細顆粒黏度大,難于沉降,給煤泥水凈化回收帶來困難,同時也嚴重影響洗選作業(yè)各環(huán)節(jié)的正常運行。因此,本文針對伊利石顆粒在水中難沉降的問題,擬采用電化學方法對其進行改性處理,研究電化學作用對伊利石類黏土礦物凝聚沉降行為的影響,探索一種解決易泥化、難沉降煤泥水的處理方法。具體研究過程為:筆者首先用氯化鈣電化學體系對其進行了改性處理,并用JS94H型微電泳儀和JC2000B靜滴接觸角測定儀測試了不同電位梯度電化學條件下改性后伊利石的ζ電位和表面接觸角,然后利用EDLVO理論計算了不同電化學條件下伊利石顆粒間的靜電作用能、極性作用能和總作用能,最后用沉降試驗驗證了不同電化學條件下伊利石顆粒的沉降性能。研究結果表明:利用電化學改性伊利石的方法,可以有效降低伊利石顆粒間靜電作用能、親水排斥能和總作用能,進而可以較好地提高伊利石顆粒間的凝聚沉降性能,當電位梯度為2v/cm時,上清液濁度最低為294NTU,是未改性處理的34.46%;在凝聚沉降過程中,伊利石顆粒形成了"邊(Edge)-面(Face)"相互吸附的網架構造,導致沉降模式為整體沉降,造成沉降速度較慢,上清液濁度總體偏大。
[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.
【作者單位】： 東北大學資源與土木工程學院;黑龍江科技大學礦業(yè)工程學院;鄭州大學;
【基金】：黑龍江省普通高校礦物加工工程重點實驗室開放課題(201307)
【分類號】：TD94
本文編號：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.
【作者單位】： 東北大學資源與土木工程學院;黑龍江科技大學礦業(yè)工程學院;鄭州大學;
【基金】：黑龍江省普通高校礦物加工工程重點實驗室開放課題(201307)
【分類號】：TD94
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