高湿度细粒散体的振动助滤  

Vibration Aiding Filtration for Fine Granules with High Water Content

作　　者：孙业志[1] 周健[1] 吴爱祥[2] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]中南大学资源与安全工程学院,长沙410083

出　　处：《有色金属》2004年第41期106-109,共4页Nonferrous Metals

基　　金：国家自然科学基金资助项目 (5 0 0 740 3 4) ;教育部博士点专项基金资助项目 (2 0 0 2 0 5 3 3 0 3 7) ;湖南省自然科学基金资助项目 (0 2JJY2 0 78)。

摘　　要：研究振动对高湿度细粒散体过滤的助滤作用并探讨振动助滤的机理。结果表明 ,对试验所用物料 ,施振对真空过滤和加压过滤都有明显助滤效果 ,对真空过滤平均含湿率可降低 6%～ 7% ,加压过滤降低 5 %～ 8% ,而散体浓度、振动频率和振动方式对过滤效果影响很小。相同条件下 ,加压比真空的过滤效果稍好一些。振动导致散体颗粒的移动和活化以及散体介质的分散 ,使滤饼内部固体颗粒将向滤饼表面移动 ,减弱紧缩活动 ,增大孔隙率 ,降低滤饼比阻 ,从而体现出助滤效果。The vibrating aiding effect on the filtration of granules with high water conten t is investigated, and the mechanism is discussed. The results show that the fi l tering efficiency is obviously increased by vibrating for both vacuum and pressu re filtration. The mean water content of granules is reduced by 6%～7% for vacu um filtration and 5%～8% for pressure filtration. However, the effects of gr anules concentration, vibrating frequency and vibrating measures on fitration a re very slight . In the same situation, the result of pressure filtration is a little better t h an that the vacuum filtration. Because of the movement, activation of the granu l es and the dispersion of the medium, the particle inside the cake migrate to the surface of the filter cake gradually, the squeezing action is weakened, and the porosity is increased, and the specific resistance of the filter cake is decrea sed. Therefore, the aided filtration is achieved.

关 键 词：细粒 助滤 加压过滤 散体介质 降低 物料 分散 真空过滤 滤饼 过滤效果 

分 类 号：TG17[金属学及工艺—金属表面处理] TQ170.7[金属学及工艺—金属学]