超声清洗法回收冷轧厂磁过滤物中的纳米铁粉

研究一种冷轧厂磁过滤物中纳米铁粉的回收方法,采用超声清洗法除去铁粉表面的油污,得到纯净的纳米铁粉,通过试验研究超声频率、功率密度、清洗温度对除油效果的影响,采用X射线衍射和扫描电子显微镜对铁粉产品进行表征。结果表明,相对于机械搅拌清洗,采用超声清洗含油铁粉,可提高清洗液的除油能力;超声频率为40 kHz,功率密度为0.44 W/cm2,清洗温度为40℃时,用清洗液清洗4次,每次清洗时间为20 min,用去离子水漂洗至澄清,真空干燥5 h,所得纳米铁粉中铁元素的质量分数为95.75%。

Recovering Nano-sized Iron Powders from Magnetic Filter Products of Cold Rolling Plant Using Ultrasonic Wave Cleaning Method

A method of recovering nano-sized iron powders from the magnetic filter products of cold rolling plant was developed.Pure nano-sized iron powders were obtained after the amusable oil on the surface was removed utilizing ultrasonic wave cleaning method.The influence of the ultrasonic frequency,power and temperature on the oil-removing effect was researched.The samples of iron powders were characterized by XRD and SEM.The results show that corresponding to mechanical stirring cleaning method,the oil removal capability of the cleaning liquid can be improved by using ultrasonic wave cleaning method.The mass fraction of iron in the nano-sized iron powders can reach 95.75% under the conditions that washing the iron powder 4 times of 20 minutes every time with cleaning liquid at 40 ℃,ultrasonic frequency is 40 kHz,powder density is 0.44 W/cm2,rinsing with deionized water until clarifying and vacuum drying 5 h.