氯化镁空气干燥器下料系统的优化与研究

Optimization and Research on the Discharge System of Magnesium Chloride Air Dryer

氯化镁脱水是现代电解金属镁工艺的上游核心工艺之一,其中第一步是通过空气干燥器(空气流化床)将含4.8个结晶水的氯化镁湿颗粒进行一次脱水。用约345℃~365℃的空气作为热介质,得到含约1.8个结晶水的氯化镁。空气干燥器及其下料系统运行的稳定性直接影响到整个脱水工艺生产的可靠性和持续性。文章对现有的空气干燥器下料系统存在的问题进行分析,通过技术改造的方式进行优化改良,结合验证性试车结论,总结了整个优化过程,阐述了不足之处,并且给出了进一步完善的建议。该下料系统的成功优化与应用为青海省第一个“揭榜挂帅”科研项目及解决盐湖老卤制备无水氯化镁这一世界性难题奠定了相关实际研究基础,其终端产品金属镁(氯化镁电解获得)及相关产品也为有色冶金行业实现“碳中和”、“碳达峰”目标的实现提供强有力支撑,对建设世界级盐湖产业基地有重要意义。

Magnesium chloride dehydration is one of the upstream core processes of modern electrolytic magnesium technology.The first step is to dehydrate magnesium chloride wet particles containing 4.8 crystal water by air dryer(air fluidized bed).Magnesium chloride containing about 1.8 crystal water was obtained by using 345℃~365℃air as thermal medium.The stability of air dryer and its feeding system directly affects the reliability and continuity of the whole dehydration process.This article analyzed the problems existing in the existing air dryer blanking system,optimized and improved it by means of technical transformation,summarized the whole optimization process combined with the conclusion of confirmatory test run,expounded the shortcomings,and gave suggestions for further improvement.The successful optimization and application of the blanking system laid a solid foundation for the first“unveiling leader”scientific research project in Qinghai Province and the solution to the world problem of salt lake old brine to prepare anhydrous magnesium chloride.The end product metal magnesium(obtained by electrolysis from MgCl 2)and related products also provide a strong support for the non-ferrous metallurgical industry to achieve the goals of“carbon neutralization”and“carbon peak”.It is of great significance to the construction of world-class Salt Lake industrial base.