微细粒鲕状赤铁矿磁化絮凝行为与机理研究

为提高赤铁矿絮凝浮选指标，分别采用磁化水、磁化矿浆和磁化淀粉3种磁化方式对赤铁矿进行絮凝沉降，考察磁处理方式对絮凝效果的影响。结果表明，3种磁化方式均能提高鲕状赤铁矿絮凝沉降率。光学显微镜分析结果显示，经过磁化处理后的絮团较未磁化时表观粒径更大，结构更加紧密，同时观察到絮团周围分散着透明的石英颗粒，说明磁化处理能够显著促进微细粒赤铁矿选择性絮凝。在磁化水、磁化矿浆和磁化淀粉3种磁化方式作用下赤铁矿颗粒表面ζ电位均随着磁化时间的增加而降低，ζ电位的变化趋势与鲕状赤铁矿在不同磁化条件下沉降率的变化规律一致。3种磁化方式对微细粒赤铁矿的絮凝过程符合扩展的DLVO理论，其絮凝机理为：磁化处理能在不同程度上降低赤铁矿颗粒表面ζ电位，进而降低了微细粒赤铁矿颗粒间的双电层排斥力，降低了颗粒间的势能垒。     

A review on lithium iron phosphate cathode materials

目前全球高动力锂离子电池系统的发展主要集中在锂锰电池,锂钴镍锰电池以及锂铁电池,其中磷酸亚铁锂材料具有高电容量,高放电功率,极佳的长循环寿命以及良好的热稳定性与高温性能等优点,已成为动力锂离子电池首选的高安全性正极材料.然而,磷酸亚铁锂材料在工业化量产时,必须解决电池芯加工性差及材料一致性不佳等问题,作者曾结合多项新颖观念与技术于磷酸亚铁锂材料制做过程,在粉体表面涂布碳层,在晶体内部掺杂金属,分别改善材料电导率与锂离子扩散速度以及有效地控制碳含量,粉体比表面积,碳层均匀性,粒径大小与分布,制备出高质量磷酸亚铁锂产品.该文将回顾并探讨上述研发工作的一些重要结果.     

Extending Shelf-Life of Fresh Wet Red Hake and Salmon Using CO2-O2 Modified Atmosphere and Potassium Sorbate Ice at 1°C

The ability to safely extend the shelf-life of fish would open up the possibility of shipping fresh wet fish by boat. Red hake and salmon can be successfully held for almost 1 month and still be sensorally acceptable. A 60% carbon dioxide:20% oxygen:20% nitrogen-modified atmosphere with a 1% potassium sorbate ice was most satisfactory. CO₂ did not lower the pH of the fish. Low temperature (1°C) and presence of both oxygen and potassium sorbate served as protection against botulism development. The presence of oxygen, even with salmon, did not lead to rancidity (TBA) problems. The Torrymeter can be used to monitor red hake quality. Work incorporating potassium sorbate dips before modified atmosphere storage with or without potassium sorbate ice is needed.