超细物料烘干系统的自控设计及PLC的应用

本文简介了氧化铝系列超细物料烘干系统的工艺流程和控制方式,重点阐述了该系统自控设备的选型、自控系统的设计及PLC的应用。

超细物料筛分方法──气流筛分

介绍实验室型气流筛分试验装置，通过装置的原理介绍和主要参数分析，为选煤工业的超细物料筛分提供借鉴。

某超细粒物料的脱水实践

某选厂粒度为-320目90%的铁精矿采用KMLZ型斜板浓密机和10m2圆盘式真空过滤机进行浓缩与过滤,最终精矿产品水份<15%,脱水效果较好,可为其他细粒物料的脱水提供有益的参考。

三聚氰胺定量包装方式研究

针对新疆心连心能源化工有限公司高压法三聚氰胺生产系统包装定量不准问题,分析现有包装秤存在数值误差,以及劳动强度高、工作效率低的主要原因。通过对比导致有斗定量包装秤和无斗定量包装秤引起计量误差的因素,并验证了无斗式包装秤在超细粉物料包装上的精度优势。实际改造一台有斗包装秤为水平螺旋给料双工位毛重式包装秤,结果表明,无斗式包装秤显著提高了包装精度,其误差符合国标要求。同时,提高了自动化程度,降低了劳动强度,改善了作业环境。

一种管式压滤机

管式压滤机是基于固液分离理论设计制造的,是一种利用超高压力对物料进行压榨过滤的固液分离设备,采用同心圆柱体结构,结构简单,可以承受高达10 MPa的工作压力。与中低压过滤设备相比,管式压滤机在超细物料和难过滤物料脱水工艺中具有显著优势,采用该设备处理的滤饼含液率、密实性和滤液均能达到工艺要求,可省去后续工艺的晾晒、烘干等工序,具有显著的经济和社会效益。

高性能振动实验筛可替代进口

一种广泛使用于化工、医药等行业实验用的高性能振动实验筛近日在河北安平县中衡机械有限公司研制开发成功。化工、医药等行业实验必备的振动实验筛此前大多依靠进口。中衡机械有限公司在有关科研院校的协助下，开发出集粉粒分级、液体过滤为一体的新型高效振动实验筛，且效率高、精度高、噪音低，特别是对易产生静电反应及超细物料筛选有着其他实验筛无可比拟的效能，可望替代进口。

A novel method for making ultra-fine metal fibers and particles

A novel method based on plastic processing and equipment for preparing ultra-fine metal fibers and particles is reported.With this new method,metal fibers and particles can both be produced on the same equipment and the surfaces of the fibers and particles can be protected from oxidation by the polymers or solvents during the preparation process.Metal-alloy powders with lower melt point were filled into polymer by an extruder,followed by a die-drawing process at a temperature lower than the melt temperature of the metal alloy.Metal fibers or particles were obtained after the polymer matrix was washed away.Metal alloy fibers can be obtained when a polymer that strongly interacts with metal alloy,such as a special polyvinyl alcohol with a low alcoholysis degree,is used as the polymer matrix.Metal-alloy particles can be obtained when a polymer with weak interaction with metal alloy,such as polyethylene(PE),is used as the polymer matrix.Based on the principle of this new method,it is possible to produce finer or even nano-sized metal fibers and particles with higher melting points.