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目前,世界各石棉生产国普遍采用风选方法分选石棉,而该法对入选矿石的湿度又有一定要求。因此干燥作业是石棉选矿工艺的重要环节之一。石棉矿石的干燥既要排除其大部分水分,又要保护纤维的天然长度,以保证石棉纤维有较高的使用价值和经济价值。而目前国内外石棉选矿工艺中大量使用的立式干燥机和顺流式回转园筒干燥机,由于矿石在筒壁固定抄板的作用下,不断地被提升和抛落,粗矿粒对纤维的撞击和磨落作用严重,造成中长纤维
At present, the asbestos producing countries in the world generally adopt the wind selection method to classify asbestos, and the law has certain requirements on the selected ore moisture. Therefore, drying operation is an important part of asbestos beneficiation process. Asbestos ore drying should not only exclude most of its moisture, but also protect the natural length of fiber to ensure that asbestos fibers have high value and economic value. At present, the domestic and foreign asbestos beneficiation process used widely in the vertical dryer and the downstream rotary cylinder dryer, as the ore wall in the fixed copy board under the action of constantly being lifted and falling, coarse ore particles on the fiber Impact and grinding effect is serious, resulting in long fibers