1. School of Chemical Engineering, Sichuan University, Chengdu 610207, China;
2. Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610207, China
Abstract：Chlorinated solid wastes discharged from industry are greatly harmful to environment, the removal of chlorine by water washing may produce large amount of chlorine-contained waste water that results in secondary pollution. In this work, a new method of CO2 mineralization coupled with organic amine extraction was applied to remove the chlorine residue in slag from TiO2 production. By extracting Cl- into organic phase, the discharge of chlorine-contained water was avoided in the washing process. The process parameters of both water washing and washing-mineralization were comparatively investigated, and the results showed that washing-mineralization consumed less water and achieved the same removal efficiency of three-stages countercurrent washing. In the de-chloride process of the low temperature chlorination slag from a plant, the de-chlorination ratio reached 90% and the tests showed the method was well repeatable. In the organic amine regeneration experiment, the organic amine regeneration ratio reached 99%, which showed the organic amine was recyclable. Because the amine is regeneratable and recyclable, the washing-mineralization method avoids the dischargement of waste water in de-chlorination of chlorine-contained slag.
SHEN Kunjie,TANG Siyang,ZHONG Shan et al. A Mineralization Technology Coupled with Amine Extraction for Removing Chlorine from Slag in TiO2 Production[J]. Chemical Reaction Engineering and Technology, 2023, 39(3): 234-239.
