Thermodynamic study on evaporation crystallization of high saline wastewater from lead-acid batteries

• Published in: Journal of crystal growth 2021-08, Vol.568-569, p.126166, Article 126166
• Main Authors: Liu, Xin, Zhang, Zhengmin, Zhang, Lin, Bu, Shi, Shi, Chengcheng, Xu, Weigang, Peng, Zhiyang, Ma, Zhilei, Xu, Chen, Yao, Hongqi
• Format: Article
• Language: English
• Subjects: A1. Crystallization; A1. Metastable zone width; A1. Solubility; B1. High saline water; Calcium ions; Crystallization; Lead acid batteries; Saline water; Wastewater
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/j.jcrysgro.2021.126166

•Solubility of high saline water from lead acid batteries was obtained.•Supersolubility of high saline water from lead acid batteries was obtained.•Metastable zone width of high saline water was obtained.•Metastable zone width of high saline water, NaCl and Na2SO4 was compared. The metastable zone width (MSZW) of Na2SO4-NaCl-H2O from high saline water of lead-acid batteries was studied at different temperatures by the conductivity method in the experiment. Results show that the metastable width of Na2SO4-NaCl-H2O increases with the increase of temperature. The MSZW of Na2SO4-NaCl-H2O containing calcium ion is larger than that of the solution without calcium ion. The MSZW at pH 1 is approximately the same as that at pH 2, and the MSZW is larger than that of the control group. The width of the metastable zone decreases by about 2.5 K from 0 r/min to 100 r/min, and 2.2 K from 100 r/min to 120 r/min. The width of the metastable zone increases to 7.5–8 K when the speed increases from 120 r/min to 140 r/min. The metastable zone width of the solution containing lead is larger than that of the control group, and the difference is in the range of 2.1 ~ 3.9 K.