A Review on Spent Pickling Liquors Treatment

Abstract

Spent pickling liquors is a hazardous waste because it is acidic and contains a large quantity of metal ions. It will cause severe environmental pollution and waste of resource if not properly treated. The traditional neutralization method will cause secondary pollutant. In this review, the latest development and research of spent pickling liquors treatment have been summarized, mainly including high temperature roasting, evaporation, ferric salt crystallization, ion exchange, membrane, chemical transformation, and electrolytic method. In the end of this review, there is outlook of spent pickling liquors treatment. It pointed out that the optimized way is to take the waste picking liquors as resource and combine the comprehensive utilization with the environment protection.