浅析小型窑外分解窑后结圈的成因和处理方法

我公司采用Φ2.8/2.4/2.8×40 m小型窑外分解窑,有时会出现结圈现象,严重时窑尾出现漏料现象,系统操作困难,质量难以保证,煤耗、电耗相应提高。因此,必须认真分析结圈的原因,有效掌握防止结圈和处理结圈的方     

大西沟菱铁矿煤基回转窑结圈原因分析及改进

通过现场半工业试验,研究分析了大西沟矿业公司510 m3回转窑结圈的原因。指出焙烧温度过高是回转窑结圈的主要原因,而原料粒度不均匀及设备参数不合理是结圈的重要原因。改造后的生产实践表明,控制焙烧温度与原料粒度、优化工艺技术与设备参数可有效减少回转窑结圈现象发生,实现了大西沟矿业公司回转窑连续30 d以上的正常生产。     

煤粉性能及其燃烧控制对石灰回转窑结圈的影响

涟源钢铁公司田湖铁矿石灰石回转窑结圈问题,严重影响了回转窑的运转率、石灰的质量和产量。本文通过结圈物的矿相鉴定,从煤的质量、灰分性能、煤粉的燃烧过程及燃烧的控制等方面,阐述了这些因素对回转窑结圈的影响,并提出了相应改进措施。     

煤粉性能及其燃烧控制对石灰回转窑结圈的影响

涟源钢铁公司田湖铁矿石灰石回转窑结圈问题，严重影响了回转窑的运转率、石灰的质量和产量。本文通过结圈物的矿相鉴定，从煤的质量、灰分性能、煤粉的燃烧过程及燃烧的控制等方面，阐述了这些因素对回转窑结圈的影响，并提出了相应改进措施。     

15～5mm酒钢镜铁矿石回转窑焙烧结圈可能性研究

为了开发利用酒钢镜铁山-15 mm的粉状镜铁矿石,在完成对试样和还原煤化学成分、软熔性能分析的基础上,对回转窑磁化焙烧工艺窑壁结圈可能性进行了研究。结果表明:试验原料及各阶段产物的软化温度均在1 100℃以上,当回转窑内温度严格控制在镜铁矿适宜的还原温度850~900℃时,回转窑内物料不会发生软熔和液化;15~5 mm的小块矿采用直径为(0.45~0.65)m×9 m燃气变径回转窑处理,在哈密烟煤用量为2%、焙烧温度为850~900℃、窑内停留时间为2.5 h、填充率为10%、焙烧产物水淬冷却后磨矿细度为-0.074 mm占80%、弱磁选磁场强度为100 k A/m的情况下,可得到铁品位为55.00%、回收率为83.00%的铁精矿,且回转窑内壁360 h未见结圈现象;科学合理的窑型、稳定合理的热制度、适宜的入窑粒度,对减少酒钢镜铁山镜铁矿石回转窑磁化焙烧结圈现象的产生十分有效。     

涟钢石灰回转窑结圈形成的机理及防止措施

对涟钢田湖铁矿石灰回转窑的结圈问题进行了研究。通过试验及分析发现回转窑形成结圈的主要原因在于：原料的粉化性及易熔杂质成分的入窑、煤粉挥发分低而灰分偏高、煅烧温度过高等，然后在机理研究的基础上提出了一系列防止结圈的技术改进措施。     

不同断面直径"O"型胶圈毛坯厚度的确定

煤矿综采设备用“O”型圈的生产过程中 ,胶料毛坯厚度对“O”型圈的外观质量有重要影响 ,不同断面的“O”型圈所需要的胶料毛坯厚度也不同。介绍了不同断面“O”型圈所需胶料毛坯厚度的确定方法     

链篦机-回转窑氧化球团结圈结块原因及预防

通过对武钢程潮铁矿链篦机-回转窑球团生产线回转窑结圈结块原因的分析,从原料、温度、风流系统及工艺控制等方面对磁铁矿链篦机-回转窑氧化球团回转窑结圈结块提出预防措施。     

球团系统工艺设备优化改造与研究

峨口铁矿球团系统投产以来,工艺设备系统存在许多技术难题,导致生球质量差,系统产量低,结圈周期短,对生产造成较大的影响。针对生球辊式筛分、煤粉燃烧系统、除尘灰循环利用等关键环节,进行了工艺设备改造,提高了生球质量、球团产量和品质,有效减少了回转窑结圈次数和危害程度。     

水泥回转窑结圈问题的初步探讨

对水泥回转窑结圈情况及其危害、产生的原因、处理方法及预防措施进行了分析和讨论。     

露天矿高边坡的坡顶不稳定地基加固研究

论述了位于非稳定高边坡坡肩的某大型工厂地基的大变形历史及其土体加固措施。为消除厂房及基础大变形破坏, 对其地基进行包括现场灌注桩、地梁、旋喷桩及地层注浆等地基加固措施, 持续6 年以上的变形监测表明, 加固措施有效地控制了地基变形, 给出了加固结构的钢筋应力计测试结果, 介绍了该高边坡与地基变形监测和加固的经验。     

Smelter feed quality control

Final concentrates and furnace feeds from Anglo American Platinum are routinely monitored for quality. Merensky Reef, UG-2, and Platreef concentrates are sampled at the concentrators, as well as blended feed at the smelters, and the composition and mineralogy of these samples are determined at Anglo American Research.This information allows the smelting characteristics of the concentrates to be predicted. Parameters such as the matte fall, spinel formation, and smelting energy requirement can be calculated by modelling.The concentrates are characterised by chemical analyses for base metals, precious elements and trace elements. Various QEMSCAN techniques are used to determine the mineralogy of the samples and the abundance of gangue minerals and base metal sulphides (BMS), as well as the mineral association, are reported.     

普通石英砂与高纯石英砂的生产技术研究

详细讨论了利用石英砂岩、石英岩或脉石英生产石英砂的工艺流程。对以SiO₂ 含量达99 %以上的脉石英或石英岩为原料, 利用工业型铁质机械设备进行大批量生产高纯石英砂的可行性进行了探讨。对石英砂的主要碾磨和干燥设备进行了讨论, 并提出了改进意见。     

白云岩的开发与应用

白云岩是一种常见矿产,我国的储藏量十分丰富。本文指出,白云岩除可用作建筑材料外,在现代工业中,它被用来提取碱式碳酸镁、生产硫酸镁和氢氧化镁和提炼金属镁;用作炼钢助熔剂和耐火原材料;若经改性,尚可用来生产功能性填料;它在农业、环保、节能、医药以及卫生领域亦可获得应用,开发利用白云石并对其进行深加工,前景十分广阔。     

Theoretical Estimate for the Parameters of Ultrasonic Impulses Excited in Geomaterials by Laser Emission

Using the transfer function method as a base, the analytical relations are obtained, as well as the main parameters are calculated for the ultrasonic impulses of longitudinal, transverse, and the Rayleigh waves excited in geomaterials by laser emission.     

Particle collision modeling - A review

Over the past 100 years particle collision models for a range of particle inertias and carrier fluid flow conditions have been developed. Models for perikinetic and orthokinetic collisions for simple, laminar shear flows as well as collisions associated with differential sedimentation are well documented. Collision models developed for turbulent flow conditions are demarcated on the one side with the model of Saffman and Turner (1956) associated with particles exhibiting zero inertia and on the other side with the model of Abrahamson (1975) for particle velocities that are completely decorrelated from the carrier fluid velocities. Various attempts have been made to develop universal collision models that span the entire range of inertias in a turbulent flow field. It is a well-accepted fact that models based on a cylindrical as opposed to a spherical formulation are erroneous. Furthermore, the collision frequency of particles exhibiting identical inertias are not negligible. Particles exhibiting relaxation times close to the Kolmogorov time scale of the turbulent flow are subject to preferential concentration that could increase the collision frequency by up to two orders of magnitude. In recent years the direct numerical simulation (DNS) of colliding particles in a turbulent flow field have been preferred as a means to secure the collision data on which the collision models are based. The primary advantage of the numerical treatment is better control over flow and particle variables as well as more accurate collision statistics. However, a numerical treatment places a severe restriction on the magnitude of the turbulent flow Reynolds number. The future development of more comprehensive and accurate collision models will most likely keep pace with the growth in computational resources.     

内蒙某地浸铀矿山自动化现状与展望

本文对内蒙古某地浸铀矿山自动化架构、工艺优化管理以及数据管理等方面的应用建设情况进行详细的介绍;并对运行状况进行了系统性评价。结合现今趋势,对未来发展提出具体化建议。     

Editor's Page

Abstract

The various steps of mine planning and control in open pits are described in connection with the appropriate mathematical models. Modern hardware for control and communication 18 summarily described. The gains which are to be realized by the various degrees of truck dispatching are discussed as well as the potential for future developments.     

Benchmarking of process models for continuous screening based on discrete element simulations

For the design and the scale-up of screening processes and the optimization of operating parameters the particle-based discrete element method (DEM) as well as classic phenomenological screening models are available. Phenomenological screening process models are simple to use and require only sparse computational resources, hence providing the possibility to use them efficiently in industrial applications. In this context, a comparative benchmark of numerous kinetic and probabilistic screening models of various complexities has been performed for discontinuous screening, recently. Following the approach of this study, in the investigation here, DEM-simulations applying spherical and non-spherical particles are used to benchmark process models for continuous screening. In the DEM-simulations different particle characteristics such as size, shape and size distribution are taken into account. Screen characteristics such as aperture size, wire shape and inclination angles as well as operational parameters including vibration frequency, amplitude, stroke angle and mass flow rate are varied. Based on the data obtained from the simulations, the overall fraction retained on the screen as well as the selectivity in terms of overflow partition number, the transport velocity and the residence time all in dependence on particle size are investigated. Finally, phenomenological screening process models are adjusted to the outcome of the DEM-simulations in terms of the fraction retained on the screen and overflow separation curves, respectively. The resulting deviations are evaluated and thereby allowing the comparative benchmarking of available process models for continuous screening. Obtained DEM-results indicate a strong dependence of screening on operational parameters and particle shape. Screening process models vary intensively in their ability to represent DEM-results.     

工程勘察施工业与工程项目管理

回顾了地矿系统工程勘察施工业的形成和发展过程,介绍了项目管理的产生与发展以及地矿系统推行工程项目管理工作等方面的情况,并提出了对今后工作的几点思考。