液力偶合器在惯性圆锥破碎机的应用研究

简述惯性圆锥破碎机的结构特点、运动分析及限矩型液力偶合器的结构传动原理，讨论了加装液力偶合器后所具有的功能。在此基础上，探讨其推广应用的可行性。     

木炭添加量对多孔莫来石陶瓷性能的影响

为了改善以木炭为造孔剂的多孔莫来石陶瓷的性能,以烧结莫来石(0.25~0.3 mm)、SiO2微粉、Al2O3微粉、滑石粉、球黏土、膨润土、甲基纤维素、木炭粉(≤0.044 mm)为原料,研究了不同量的木炭粉(外加质量分数分别为0、2%、4%、6%、8%、10%、12%)对多孔莫来石坯体的成型外观、烘干后的常温耐压强度及1 400℃保温3 h热处理后的显气孔率和常温耐压强度的影响,并对不同木炭添加量的多孔莫来石试样进行了显微结构分析。结果表明:外加质量分数≤8%的木炭,制成的多孔莫来石坯体可较好成型;外加质量分数2%~8%木炭的莫来石坯体与不添加木炭的相比,烘干后试样的常温耐压强度明显提高;多孔莫来石热处理后的显气孔率随着木炭添加量的增加而增加,常温耐压强度随之降低。综合考虑多孔莫来石陶瓷各项性能,木炭外加质量分数不宜超过8%。     

废旧锂离子电池正极活性材料的焙烧及其浸出

采用湿式破碎分选、钴酸锂与碳粉混合物预焙烧、钴酸锂预焙烧产物与硫酸钠和浓硫酸混合体系焙烧、热水浸出焙烧产物中的钴,研究了钴酸锂的焙烧及浸出过程。实验结果显示:锂离子电池经湿式破碎分选后铜箔的回收率大于97%,钴酸锂粉末回收率大于98%;钴酸锂与碳粉混合物经700℃预焙烧2 h后再与硫酸钠和浓硫酸在200℃下焙烧4 h,焙烧产物用70℃热水浸出30 min,钴的浸出率可达97%;XRD分析焙烧产物发现生成了Na2Co(SO4)2和Na6Co(SO4)4。     

铜精矿冻块破碎系统的设计与应用

为解决铜精矿冻块破碎难的问题，结合铜精矿冻块物理性质和现场实际，选用反击式破碎机对冻块破碎工艺进行了系统地改进设计，力求彻底改善冻块破碎效率低、产品粒度无法满足后续工序要求的生产现状。冻块破碎系统投入使用后，该公司的生产组织得以优化，生产效率大幅提高，生产成本逐步降低。     

Axial crushing of flattened expanded metal tubes

This paper presents an investigation on the structural behavior of flattened expanded metal tubes subjected to axial crushing. At first, the study is carried out experimentally to investigate the effect of the angle formed between the expanded metal cell and the applied load. Secondly, the results are compared with experimental results for standard expanded metal sheets. Thereafter, numerical analyses are conducted by means of nonlinear finite element models, to investigate the enhancement in the energy absorption characteristics due to flattening of the expanded metal. Both results, experimental and numerical show a significant increase in energy absorbing capacity and mean force for the flattened tubes.     

干法乙炔装置的改进

针对干法乙炔装置运行过程中出现的问题,对破碎、除铁、洗涤、除尘系统进行了优化,保证了装置的平稳运行。     

鑫汇公司350t/d选矿厂工艺优化改造

基于对低能耗及设备高效利用的要求,鑫汇公司350 t/d选矿厂原工艺流程已无法满足现场的生产需求,对其进行了工艺优化改造。通过调整破碎机安装位置、振动筛安装方向、药剂制度以及更换细碎设备、筛网尺寸等措施,达到了节能降耗的目的,不仅增加了选矿厂的生产能力,而且提高了金的回收率,由89.08%提高到92.58%,年增创收益达1 494.41万元,经济效益和社会效益显著。     

Axial crushing and optimal design of square tubes with graded thickness

Introducing thickness gradient in cross-section is a quite promising approach to increase the energy absorption efficiency and crashworthiness performance of thin-walled structures. This paper addresses the deformation mode and energy absorption of square tubes with graded thickness during axial loading. Experimental study is firstly carried out for square tubes with two types of thickness distributions and numerical analyses are then conducted to simulate the experiment. Both experimental and numerical results show that the introduction of graded thickness in cross-section can lead to up to 30–35% increase in energy absorption efficiency (specific energy absorption) without the increase of the initial peak force. In addition, structural optimization of the cross-section of a square tube with graded thickness is solved by response surface method and the optimization results validate that increasing the material in the corner regions can indeed increase the energy absorption efficiency of a square tube.     

Phase and Microstructural Characterization of Iron Ore Pellet and their Relation with Cold Crushing Strength Test

In the production of the pellets, phase identification for specific sintering condition is of prime importance in understanding the basis for the production and the required properties. The application of a methodology involving optical and scanning electron microscope equipped with an EBSD opened a broad possibility to establish a base for the relationship between heat-treated pellet microstructural features and cold crushing strength. The first results from the conjoined application of these techniques show that the cold crushing strength of the pellet increase with the decrease of porosity, the appearance of the fayalite, as well as the presence of magnetite-unoxidized.     

On the effect of geometrical designs and failure modes in composite axial crushing: A literature review

Composite materials have been known for its low density, ease in fabrication, high structural rigidity, and wide range applications, i.e. aeronautic applications and automotive industry. Due to this, extensive studies had been conducted to evaluate its axial crushing ability to replace metallic materials. In this paper, it reviewed the usage of fibre reinforced plastic composite (FRP) as an energy absorption application device. Failure modes and geometrical designs such as shapes, geometry and triggering effect have been studied where these factors affected on peak load and specific energy absorption significantly. Accordingly, numerical analysis for axial crushing of affected factors had been simulated to predict the failure mechanisms of FRP composites.