Development Status on Comprehensive Utilization of Residue of Molten Salt Chlorination

This is a paper in the field of metallurgical engineering. High-end titanium products, metallic titanium and chlorinated titanium dioxide, are of great strategic significance to economic development and national security.TiCl₄ is an intermediate for the production of high-end titanium products. The main industrial production methods are molten salt chlorination and boiling chlorination. The titanium resources in our country contain high Ca and Mg impurities, which are more suitable for the production of TiCl₄ by the molten salt chlorination method.However, there is a large amount of residue of molten salt chlorination generated, which has complex components and is difficult to be recycled. Direct discharge of those residue will pollute the environment and waste resources.This paper systematically analyzes the research status and development trends of comprehensive treatments of residue of molten salt chlorination at home and abroad.It is pointed out thatdeep burial and accumulation after lime neutralization treatment of residue of molten salt chlorination cannot solve the environmental pollution problem.The water solution treatment can specifically recover certain substances in the filtrate, but the amount of wastewater is large, and the removal of impurities is difficult. Additionally, the process flowsof those water solution treatmentsare always complicated, and there is no effective utilization of the filter residue. The non-water-soluble methods have unique development advantages, among which the method of high-temperature phase transformation is a promising treatment, which could recycle and utilize the residue of molten salt chlorination at high temperature without coolingand water dissolution, quite reducing the amount of wastewater, environmental pollution,and resources loss.