Development Status on Comprehensive Utilization of Residue of Molten Salt Chlorination
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摘要:
这是一篇冶金工程领域的论文。钛的高端产品金属钛和氯化法钛白粉对发展国民经济、巩固国家安全具有重要战略意义。TiCl4是高端钛产品生产过程中的中间体，主要工业生产方法有熔盐氯化法和沸腾氯化法。我国钛资源Ca、Mg杂质含量高，更适合采用熔盐氯化法生产TiCl4。但熔盐氯化工艺产生大量的熔盐氯化废渣，组分复杂，回收处理困难，直接排放造成环境污染，资源浪费。本文对国内外熔盐氯化废渣综合处理的研究现状及发展动态进行了分析，指出目前国内外主要采用的深埋及石灰中和处理后堆积的方法，并不能解决其对环境的污染问题；水溶法处理可针对性回收滤液中某些物质，但废水量大，杂质脱除困难，工艺流程复杂，且滤渣无有效的处理方法；非水溶法处理具有独特的发展优势，其中高温相转化法不需要经过冷却、水溶等操作，避免了除杂后大量废水的产生、流程对环境造成污染、资源利用率低等问题，该方法能在高温下实现熔盐氯化废渣的整体回收利用，值得进一步研究。
Abstract: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.
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