用离心法代替浮选提纯镜铁矿制备氧化铁红色素

This study used specularite, a high-gradient magnetic separation concentrate, as a raw material in reverse flotation. An iron concentrate with a grade of 65.1wt% and a recovery rate of 75.31% were obtained. A centrifugal concentrator served as the deep purification equipment for the preparation of iron oxide red pigments, and its optimal rotating drum speed, feed concentration, and other conditions were determined. Under optimal conditions, a high-purity iron oxide concentrate with a grade of 69.38wt% and a recovery rate of 80.89% were obtained and used as a raw material for preparing iron oxide red pigment. Calcining with sulfuric acid produced iron red pigments with different hues. Simultaneously, middlings with a grade of 60.20wt% and a recovery rate of 17.51% were obtained and could be used in blast furnace ironmaking. High-value utilization of specularite beneficiation products was thus achieved.     

传质填料反应器去除污水中有机物的试验研究

采用SCMT型自旋传质生物载体填料处理城市污水,结果表明,SCMT型自旋传质生物载体填料具有良好的传质性能,在停留时间为1.0 h,气水比为4∶1的情况下,反应器出水水质能够达到《城镇污水处理厂污染物排放标准》(GB18918-2002)中规定的二级标准。     

低压电力线载波远程抄表系统设计

介绍了一种利用现有的低压电力网和公共电话网作为数据采集与传输通道,并应用扩频技术的低压电力线载波远程抄表系统。本文从系统构成、实现原理、设计方案和实现方法等方面进行了详细的阐述。     

用圆规或袖珍机编绘赤平投影图

本文介绍了用圆规或袖珍机编绘赤平图的方法,系统介绍了原理和公式。实际上,利用袖珍机上的有关程序,基本上可以处理赤平投影法所能解决的计算和图示问题。     

利用编号计算点阵图形旋转后位置的新方法

定义了点阵图形的最小旋转点阵空间,根据点在最小旋转点阵空间中的位置,给点阵图形中的每个顶点一个编号。给出了一个算法,利用编号计算点阵图形的顶点在其最小旋转点阵空间中旋转特定角度后的位置。给出了算法的理论证明。该算法与常规的用旋转公式的方法相比,在时间效率没有降低的同时,不用存储点旋转后的位置坐标,从而节省了存储空间。     

ANALYSIS OF PENTACHLOROPHENOL IN WATER BY PURGE AND TRAP CONCENTRATOR COUPLED TO GAS CHROMATOGRAPHY

INTRODUCTIONDuring bleaching with chlorine in paper making, multifarious organic chlorides are produced by reaction of degradated products of lignin and chlorine. They can cause the pollution of water body if these organic chlorides are not treated and discharged directly, which is harmful to human health. So it is urgent to analyze organic chlorides precisely in waste water in order to establish appropriate treatment scheme.Pentachlorophenol (PCP) is the most dangerous substance among t…     

抛物积分微分方程的旋转Q1元的超逼近分析

主要讨论在正方形网格上抛物积分微分方程的旋转Q1非协调元的超逼近性,在不需要Ritz-Voherra投影及任何修正格式情况下．利用该单元的特殊性质,得到了相应的超逼近结果．     

３８ｋＷ 级碟式光热发电系统机架结构的承载性能

为实现太阳光能的高品位利用,设计了以抛物聚光器为聚光功能载体且配有双轴视日跟踪机构的碟式/斯特林热发电系统的机架结构.在机架承载和传力特性一致的基础上建立了机架的有限元模型,并基于数值风洞模拟的机架风载荷,计算得到了机架处于不同高度角时自重和风载作用的变形与应力分布,分析了机架承载的位移特性和薄弱位置的应力分布.结果表明,该机架在8级风载(17.1 m/s)作用时聚光器仍具有较好的几何"保型"能力,且在抗风运行以及12大风避险时结构均处于安全状态.