新型连续型离心选矿机回收钨细泥的工艺研究

江西某钨选矿厂所属钨细泥成分复杂,生产的钨精矿品位较低,无法直接利用。针对该钨细泥粒度微细,-0.038mm粒级WO3含量高达61.07%,粒度分布较宽,黑白钨共生的特点,研发了LL立式连续型离心选矿机,开发了"预先浮选脱硫—浮选预富集脱除粗粒脉石—立式连续型离心选矿机精选分离"浮选重选联合新工艺,并获得了WO3品位31.64%、回收率84.67%的钨精矿,实现了钨细泥的高效回收。自主研发的新型连续型离心选矿机对钨细泥具有良好的分选效果,可实现与浮选作业连续组网工作,有利于生产应用。     

某金矿快速浮选工艺与重—浮联合工艺对比试验研究

在对某金矿矿石性质研究的基础上,采用快速浮选工艺与重—浮联合工艺进行对比试验研究,探索两种工艺的最优流程与药剂制度。结果表明,原矿金含量为2.43 g/t,其他有价金属含量较少,当磨矿细度为-0.074 mm占70%时,裸露金含量占57.49%,其他主要为黄铁矿和毒砂包裹金。在-0.074 mm占70%的细度条件下,采用快速浮选工艺,可获得金品位54.20 g/t、回收率70.81%的金精矿1和金品位17.52 g/t、回收率19.76%的金精矿2,金综合回收率达到90.57%;采用重—浮联合工艺,可获得金品位177.2 g/t、回收率29.44%的重砂和金品位30.68 g/t、回收率59.52%的金精矿,金综合回收率为88.96%。两种工艺均贯行的是“能收早收”的原则,但选矿指标略有差异,快速浮选工艺有利于提高金的回收率,而重—浮联合工艺则有利于获得部分高品位精矿产品。可根据实际情况选择不同的工艺流程。     

海外矿山智能选厂建设实践

随着智能制造相关技术的不断发展和矿产资源高效开发利用的需求不断加强,各个矿业集团对智能选厂建设的意向越来越高。本文结合紫金集团某海外矿山智能选厂建设实践,提出了基础数据、专家控制、模型优化和智慧管控四层结构的智能选矿厂框架模型,阐述了生产数字化、操作智能化、分析模型化、管理信息化的智能选厂建设思路,总结了智能选厂建设的应用效果和经验,供选矿领域同行探讨与借鉴。     

Progress in beam-down solar concentrating systems

Concentrating solar technologies are promising renewable energy systems for exploiting incident beam solar irradiation with high exergy efficiency values. These systems provide the possibility for producing useful heat at high temperatures that can be utilized by highly efficient power cycles or producing directly solar fuels with receiver reactor technology. In the last years, the concept of beam-down concentrating solar technology gains more and more attention due to a series of advantages associated with this idea. This concept is based on the use of two-stage reflectors for concentrating solar irradiation close to the ground, something that leads to a more compact system with reduced height. Furthermore, the high-temperature heat production and the chemical processes take place on the ground and not at a great height, increasing the safety levels of the system. Moreover, this design leads to compact configurations with lower materials use, lower wind loads and without the need to move the receiver for tracking the sun.The objective of this review is to present the recent progress on beam-down solar concentrating technology and to highlight the need for giving attention to this direction. Critical advantages of this technology are demonstrated and the associated limitations are discussed. The emphasis is on the presentation of the different technologies that can be coupled with the beam-down technology. Thermodynamic power cycles (Brayton, Rankine and Stirling), photovoltaics, thermochemical processes, as well as other applications are included and discussed. Practically, power production and solar fuels are the major useful outputs that can be generated by beam-down solar concentrating configurations. The reviewed technologies are critically discussed and compared in terms of energy, economic and environmental aspects. Future steps in the field are suggested based on the existing literature.     

Experimental investigation of solar-powered food steamer based on parabolic dish concentrator for domestic applications

Steam cooking is beneficial over other cooking techniques like boiling since it preserves more vitamins lost during other methods. In this study, a novel solar food steamer (SFS) based on a parabolic dish concentrator (PDC) is designed and constructed for domestic food preparation. A straightforward fabrication process of a 2.626 m² PDC with design calculations is also presented. The system's instantaneous energy and exergy efficiency evaluation has been examined from different tests over three consecutive days. The system's high energetic and exergetic efficiency was achieved in the case of sweet potato, that is, 72.83% and 15.14%, respectively. In the case of dried chickpeas, the maximum steaming duration of 70 min was attained, along with an energy efficiency of 47.74% and an exergy efficiency of 10.07%. In addition, an economic analysis was performed to determine the payback time in terms of cost and utility. The payback time for the proposed method is 2.4 years. The SFS may save 43 kg/month of carbon dioxide from escaping into the atmosphere; it can be considered an environmentally valuable device.     

SL离心机从攀西选钛尾矿中分选微细钛铁矿的试验

针对攀西地区选钛尾矿中微细钛铁矿难以回收利用的问题,本文采用SLon-100周期式脉动高梯度磁选机和SL-400离心机开展微细钛铁矿分选试验研究。结果表明,对TiO₂品位4.77%的选钛尾矿,采用SLon强磁一粗一扫一精选预富集、钛精矿分级,可得到TiO₂品位为18.36%的-0.037mm微细钛粗精矿；该粒级钛粗精矿采用SL-400离心机一粗一扫—精选、精选尾矿和扫选精矿合并再选的工艺,可以获得作业产率42.39%、TiO₂品位30.95%、TiO₂作业回收率71.04%的钛精矿,为后续浮选精矿、生产合格钛精矿产品创造良好的条件。该研究结果说明了SL离心机用于分选攀西地区微细钛铁矿的可行性,对提升攀西地区钛铁矿资源的开发利用水平提供了一种新的技术思路。     

基于数据边缘计算的智能集中器设计与应用

集中器在智能抄表系统中有着重要的中继作用,为实现电能计量自动化向智能化的转变,如何结合新的通信技术和智能计算技术,开发新一代智能集中器迫在眉睫.主要讨论如何实现基于数据边缘计算的智能集中器设计与应用.首先分析了具有边缘计算功能的智能集中器设计可行性方案,然后重点讨论了基于边缘计算的数据采集算法,包括数据库构建、数据筛选、数据清洗方法,最后讨论了数据融合与决策管理,提出了一类智能运维方法.所提出的设计思路能实现电能计量大数据的分布式计算,降低云计算数据中心的计算压力,有效提高电能计量系统运维效率.     

A tubular solar still integrated with a heat pipe

The aim of this work is to explore the thermal performance of a tracked tubular solar still (TSS) with a parabolic trough concentrator in Baghdad (33.27° N, 44.37° E) in September 2022. The present tubular still is distinguished by its hexagonal glass cover. The effect of integrating the TSS with a heat pipe, the still tilt angle (10°, 15°), and the depth of saline water inside the still partitions on the productivity of freshwater are investigated. The results showed that using heat pipe enhances the freshwater productivity by 25%–40% and the efficiency by 25%. For the still integrated with heat pipe, as the water depth is increased from 5.5 to 6.5 cm the productivity of freshwater is increased by 16% and 20% for tilt angles 10° and 15°, respectively.     

利用X射线智能选矿机对半自磨顽石的抛废试验研究

云南某锡铜硫化矿新系统采用半自磨工艺取代传统的三段一闭路破碎工艺,由于半自磨机本身的工作特点,在磨矿过程中会产生一些难磨的临界离子,排出磨机后通过筛分产生所谓的顽石。采用新系统后半自磨筛上顽石粒度为-60+10 mm,这部分顽石近圆形、棱角少、具有品位低、硬度大、高抗压及抗磨损等特点,破碎这些顽石需要较高的能耗,不利于企业提质扩能和降本增效。采用X射线智能选矿机对这部分顽石进行预选抛废,半工业试验结果表明,当给矿锡品位为0.13%～0.224%、铜品位为0.168%～0.283%时,作业抛废率达到52.04%～59.26%,废石中锡品位降至0.045%～0.05%,铜品位降至0.048%～0.051%,抛废精矿中锡、铜金属富集比达到2倍左右,抛废精矿锡、铜回收率均超过80%。初步效益分析表明,采用X射线智能选矿机对顽石进行预选年创收约为271.72万元,经济效益显著,具有一定的借鉴及推广价值。