Kinetics Study on the Effect of NaCl on the CaSO4 Dissolution Behavior

5th Annual International Conference on Material Science and Environmental Engineering

材料科学;生态环境科学

Song, Jingyao^1 ; Shi, Peiyang^1 ; Wang, Yeguang^1 ; Jiang, Maofa^1

Key Laboratory for Ecological Utilization of Multimetallic Mineral, Ministry of Education, School of Metallurgy, Northeastern University, Shenyang, Liaoning, China^1

关键词: Apparent activation energy;    CaSO4;    Conductivity meters;    Dissolution behavior;    Dissolution kinetics;    Dissolution rates;    NaCl concentration;    NaCl, Dissolve;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/301/1/012154/pdf
DOI  :  10.1088/1757-899X/301/1/012154

来源: IOP

【 摘 要 】

The study of the dissolution kinetics of CaSO4is essential for the control of the dissolution and recrystallization behavior of CaSO4. In this work, the kinetic behavior of CaSO4dissolved in NaCl solution was investigated by means of conductivity meter. The results show that with the increase of concentration of NaCl, the temperature rise and the time prolonged, the dissolution rate of dihydrate CaSO4gradually increases, and the dissolved apparent activation energy is gradually decreased. When the NaCl concentration is 1.8%, the dissolution kinetic equation is 1-(1-α) 1/3=5.46∗10-4exp (-9147/RT) t; When the NaCl concentration is 3.0%, the dissolution kinetic equation is 1-(1-α) 1/3=2.81×10-4exp (-6753/RT)t; When the NaCl concentration is 3.6%, the dissolution kinetic equation is 1-(1-α) 1/3=3.07×l0-4exp(-6103/RT)t.