金属砷生产过程中310S不锈钢罐体腐蚀问题分析与研究

Analysis and research on corrosion of 310S stainless steel tank in the production of metal arsenic

山东某公司生产金属砷采用电热竖罐碳热还原工艺,生产过程中罐体腐蚀情况严重,使得金属砷的生产成本居高不下。针对该问题,此公司对310S不锈钢罐体腐蚀机理研究进行了分析,发现是三氧化二砷中S、Cl等杂质元素在高温条件下侵蚀罐体基材表面的氧化膜导致腐蚀开始,通过采取在310S罐体表面镀金属材料涂层,并降低作业温度等措施,罐体使用寿命从8~10 d延长至30~45 d,大大降低了金属砷生产成本。

Carbothermic reduction process was adopted by a company in Shandong to produce metal arsenic,causing serious corrosion to the vertical electric heating tank during the production process and keeping the production cost of metal arsenic stubbornly high. To solve this problem,the company analyzed the corrosion mechanism of the 310S stainless steel tank and found that the corrosion was caused by impurity elements such as S and Cl in arsenic trioxide corroding the oxidation film on the surface of the tank base material at high temperature. By taking measures such as plating metallic coatings on the surface of 310S tank and reducing operating temperature,the service life of the tank could be extended from 8 ~ 10 d to 30 ~ 45 d,greatly reducing the production cost of metal arsenic.