平板磁选机磁场强度下降如何检测?


发布时间:

2026-10-13

平板磁选机在石英砂湿法除铁中靠磁板吸附铁杂质,运行两三年后,不少客户发现除铁效果大不如前,精矿铁含量慢慢超标。用高斯计一测,磁板表面磁场强度比新机时低了不少。磁

平板磁选机在石英砂湿法除铁中靠磁板吸附铁杂质,运行两三年后,不少客户发现除铁效果大不如前,精矿铁含量慢慢超标。用高斯计一测,磁板表面磁场强度比新机时低了不少。磁板退磁是永磁设备绕不开的问题,但退磁速度有快有慢,关键看日常使用是否踩了几个坑。

平板磁选机磁板退磁了怎么办?.png

磁板长期处于高温环境,退磁速度会明显加快。 钕铁硼磁材虽然磁力强,但耐温性有限,工作温度超过80℃后,磁畴结构逐渐变得不稳定,磁力永久性衰减。平板磁选机如果安装在烘干机或热风管道附近,磁板长期受热辐射,退磁速度会比正常工况快好几倍。建议在磁选机与热源之间加装隔热板,或调整设备布局拉开距离。冷却水温也不宜过高,夏季进水温度最好控制在25℃以下。

磁板表面长期吸附铁泥不清理,磁场被屏蔽的同时也在加速退磁。 有些客户觉得磁板吸满铁粉不影响使用,反正断电就会掉。实际上,吸附的铁磁性物质会形成磁短路,磁力线在铁泥层内部闭合,磁板自身处于“过载”状态,时间久了磁畴方向逐渐偏转,磁场强度自然下降。每班次冲洗一次磁板,保持表面干净,比任何保养都管用。

给料中混入强磁性大块铁件,撞击磁板也可能造成局部退磁。 碎钢棒、螺栓之类的大块铁件被磁板吸住后,在矿浆冲击下反复撞击磁板表面,撞击点的磁畴结构被破坏,形成局部弱磁区。在平板磁选机前加装一道格栅或永磁除铁器,把大块铁件提前截住,能有效保护磁板。

日常维护中每季度用高斯计检测一次磁板表面磁场分布,发现某区域明显偏低时,若确认是退磁而非铁泥覆盖,只能更换该块磁板。山鲁重工在石英砂磁选设备领域服务多年,可根据现场工况推荐耐温等级更高的磁材。设备运行遇到问题,欢迎联系山鲁重工技术团队沟通交流:张经理 13583776655(同微信)。


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