PURIFICATION OF COKING DESULFURIZATION WASTE SALT UNDER A WATER-ETHANOL SYSTEM

LIANG Zhuanzhuan; YANG Yanqing; GAO Yuan; ZHANG Yanrong; ZHANG Weike

doi:10.13205/j.hjgc.202211013

Volume 40 Issue 11

Nov. 2022

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LIANG Zhuanzhuan, YANG Yanqing, GAO Yuan, ZHANG Yanrong, ZHANG Weike. PURIFICATION OF COKING DESULFURIZATION WASTE SALT UNDER A WATER-ETHANOL SYSTEM[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(11): 92-97,158. doi: 10.13205/j.hjgc.202211013

Citation:

LIANG Zhuanzhuan, YANG Yanqing, GAO Yuan, ZHANG Yanrong, ZHANG Weike. PURIFICATION OF COKING DESULFURIZATION WASTE SALT UNDER A WATER-ETHANOL SYSTEM[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(11): 92-97,158. doi: 10.13205/j.hjgc.202211013

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PURIFICATION OF COKING DESULFURIZATION WASTE SALT UNDER A WATER-ETHANOL SYSTEM

doi: 10.13205/j.hjgc.202211013

1. School of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Received Date: 2022-04-08
Available Online: 2023-03-24

Abstract

Abstract

Based on the analysis of solubility of sodium thiocyanate (NaSCN) and sodium thiosulfate (Na₂S₂O₃) under a water-ethanol system, two types of desulfurization mixed salts in the coking plant were chosen for further purification and separation through decolorization and water-ethanol system separation method. NaSCN products with a purity of 94% to 96%, and Na₂S₂O₃ products with a purity of 95% to 98% were obtained respectively. Among them, the recoveries of NaSCN and Na₂S₂O₃ in the first type of waste salt (white, improved ADA desulfurization method) were 90.8% and 68.3%, respectively, and the recoveries of them in the other waste salt (green, PDS desulfurization method) were 91.3% and 81.8%, respectively. Besides, desulphurization waste salt and products were detected and analyzed by XRD, TG-DSC and FT-IR, which showed that the quality of the products by the water-ethanol system separation method was similar to that of commercially available NaSCN and Na₂S₂O₃. Hence, instead of absolute ethyl alcohol, carbinol and other pure solvents, the water-ethanol system made the operational process relatively safer. In addition, compared with the step crystallization process, the method had the advantages of high purity of products, less energy consumption. Therefore, the water-ethanol system separation method had certain theoretical value and practical significance for the resource utilization of coking desulfurization waste salt.
- coking desulfurization waste salt,
- improved ADA desulfurization method,
- PDS desulfurization method,
- water-ethanol system,
- sodium thiocyanate,
- sodium thiosulfate

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References(25)

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