振动筛筛分效率的影响因素分析

从筛面结构参数、物料性质、振动筛振动特性参数、振动电机选择等4个方面分析了影响筛分效率的因素,提出了提高筛分效率和处理量的措施,对改善筛分性能具有较好的指导作用。     

某稀有稀土多金属矿的预先抛尾工艺研究

针对内蒙古某稀有稀土多金属矿开展了粗粒预先抛尾工艺研究。通过重液浮沉试验获得了原矿预先抛尾的理论指标,通过系统的条件试验,研发了原矿“重介质旋流器分选+摇床重选”的组合粗粒抛尾工艺。结果表明：原矿破碎至-1.25 mm后,通过重介质旋流器和摇床分选,可以在入磨前抛弃30.72%的尾矿,得到REO、ZrO₂、Nb₂O₅的回收率为94.03%、93.99%和91.04%的精矿。该工艺有助于节省磨矿成本,提升矿床开发经济效益。     

胸大肌肌皮瓣修复晚期舌根癌术后缺损的疗效

目的：探讨胸大肌肌皮瓣修复晚期舌根癌术后缺损的临床效果。方法回顾性分析2006年8月至2013年12月在南方医科大学附属南方医院口腔医院住院治疗的行带蒂胸大肌肌皮瓣修复20例舌根癌术后局部缺损患者的临床资料。观察20例患者术后6个月舌体外形、语音及口咽功能恢复情况，并对20例患者术前、术后6个月功能恢复进行评分（采用华盛顿大学生存质量问卷表评分）。结果20例患者中，19例术后肌皮瓣均成活，切口Ⅰ期愈合；1例切口二期愈合。20例供区切口均Ⅰ期愈合。行放疗后，患者皮瓣均未出现坏死。20例患者术后6个月舌体外形、语音及口咽功能恢复满意。16例语音清晰；4例语音不清晰，但不影响交流，经过语音功能训练后，均达到语音清晰。20例患者 术 后6个 月 活 力、咀嚼、味觉、唾液和肩功能得分与术前比较差异均无统计学意义（P ＞0．05），而疼痛、外貌、娱乐、吞咽、语言、情绪和焦虑得分均明显高于术前（均 P ＜0．05）。结论采用胸大肌皮瓣进行修复和重建晚期舌根癌术后缺损，可获得良好的功能和整体生存质量。     

The effect of silica nanoparticles on the dustiness of industrial powders

Industrial powders are prompt to be airborne during processing. High dustiness levels may cause process complications like cross-contamination, product loss and filter clogging while increasing the risk of inhalation, dust explosion and fire. Thus, dustiness is often associated with occupational exposure. Despite this, powder products are usually composed of multiple ingredients with silica nanoparticles (S-NP) systematically added to ease their handling. Surprisingly, the relationship between dustiness and product formulation has not been commonly studied. This work investigates the influence of S-NP, SIPERNAT D10 (SD10), on the dustiness of four industrial powders–Avicel PH102, wheat flour, joint filler, and glass beads–using two standard methods: the rotating drum (EN 15051–2) and the vortex shaker (EN 17199–5). Our results show that the dustiness of mixtures powder + SD10 are statistically higher than those of the powder alone and can reach the levels of SD10. TEM micrographs from airborne particles collected in the vortex shaker showed that SD10 detached from the surface of the powder during aerosolisation, emitting nanometric dust; adding SD10 increases the potential for inhalation exposure during industrial processing and handling. Surface energy analysis by inverse gas chromatography (IGC) leads us to conclude that stronger powder-to-SD10 interactions result in less dust emission.