【作者】 陈南春； 敖寒梅；

【Author】 CHEN Nan-chun AO Han-mei (Key Laboratory of Nonferrous and New Materials Processing Technology,Ministry of Education,Department of Materials and Chemistry Engineering,Guilin Institute of Technology,Guilin 541004,China)

【机构】 桂林工学院材料与化学工程系有色金属及材料加工新技术教育部重点实验室；

【摘要】 针对电机用铁氧体（主要成分有 Fe₂O₃,SrCO₃, 添加剂有 SrCl₂,SiO₂,SrSO₄,CaCO₃,Al₂O₃,Cr₂O₃） 中 Cr⁶⁺含量较高,采用高温氩气还原反应法,分250～ 780～1150℃3个温度段还原,每个温度段恒温10min．利用二苯碳酰二肼(C₁₃H₁₄N₄O)分光光度法检测其 Cr⁶⁺ 含量,利用能谱分析其成分及含量对比变化,X 射线衍射对比分析反应前后主要成分变化趋势．结果显示铁氧体中 Cr⁶⁺含量由2×10^-4左右降至5×10^-5以下,其主要成分改变量较小,指标达到欧盟实施的《电器、电子设备中限制使用某些有害物质指令》（the restriction of the use of certain hazardous substances in electrical and electronic equipment,简称 RoHS）环保条款要求．更多还原

【Abstract】 For the ferrite（the main ingredients are Fe₂O₃ and SrCO₃,additives are SrCl₂,SiO₂,SrSO₄,CaCO₃,Al₂O₃ and Cr₂O₃）used in motor contains higher content of Cr⁶⁺,the high-temperature argon-gas reduction method was used to reduce it in the paper,and the reduced temperature could be controlled from 250 to 780℃ and then to 1150℃.At every point of temperature above,heating was continued for 10min respectively.The content of Cr⁶⁺was detected with the dipehenylcarbohydrazide(C₁₃H₁₄N₄O)spectrophotometry,and its changed content was inverstigated by means of SEM and XRD measurements.The results indicate that the content of Cr⁶⁺was reduced from about 2×10^-4to 5×10^-5below, and the change of major ingredients is slight.Also the contend is up to the mustard of the RollS executed by the European Union.更多还原