锡石多金属硫化矿微波助磨试验研究

本文以广西某选矿厂锡石多金属硫化矿矿石为原料,研究了微波预处理对矿石磨矿产物粒度组成、磨矿动力学、破碎速率及磨机生产能力的影响。结果表明,微波预处理后,矿石在不同磨矿时间下的磨矿产物粒度均变细,-0.074mm粒级含量提高了4.41%~12.90%；微波预处理前后该矿石磨矿均符合一级磨矿动力学模型；微波预处理使矿石的破碎速率(S₁)值提高近57%,且磨机的生产能力得到了明显提升。因此,微波预处理可以降低矿石的强度,强化矿石的磨矿过程,是一种有效的降低磨矿能耗、提高磨矿效率的方法。     

X射线荧光光谱在铜矿石分析中的应用文献评介

作者收集了我国用X射线荧光光谱(XRF)分析技术进行铜矿石(含铜精矿)分析的文献共计51篇,其中野外现场分析文献21篇,实验室内分析文献30篇。实验室内方法文献包括熔融制样法12篇,粉末压片制样的15篇,其他方法3篇。文章用列表方式对文献要点进行了介绍,对其中的多元素分析方法文献进行了重点评介,也特别讨论了X射线荧光光谱分析的技术条件、制样方法选取、标准物质与标准方法等问题。文献表明:XRF已成为铜矿石主次痕量分析最强有力的技术方法之一,并随着社会对环境需求的增长,直接粉末压片制样的XRF方法必将具有更广阔的发展前景。全篇引文89篇。     

Property uniformity of thick nickel-based alloy plate for nuclear power steam-generator divider plate

This paper introduces a thick 690 nickel-based alloy plate produced by the former Baosteel Special Steel Co.,Ltd.used as the steam-generator divider plate in the pressurized water reactor nuclear power plant.According to the product characteristics and design requirements of the thick nickel-based alloy plate, multidimensional sampling and testing were conducted to investigate its microstructure and mechanical properties.The results show that all the property indexes of the thick hot-rolled nickel-based alloy plate meet the design requirements, and there is good uniformity in the microstructure and mechanical properties in different dimensions.These findings indicate that China has mastered the core manufacturing technology of thick nickel-based alloy plates for their use as divider plates in nuclear power steam generators.     

某矿山特大采空区下矿体回采方案研究

某矿在长期使用空场采矿法中形成了特大采空区，给矿山生产带来了安全隐患。针对这一难题，根据矿山实际的矿体赋存、开采技术经济条件以及空区特征,对空区下矿体回采方案进行了分析与研究，提出了空场嗣后充填采矿法和上向水平分层充填采矿法2种回采方案。考虑到矿山的实际情况，空场嗣后充填采矿法较优，但矿山空区情况已经不容乐观，应及时对空区进行充填处理。     

鑫达黄金矿业急倾斜薄矿体中深孔采矿方法的研究与优化

近年来，随着开采技术的发展，急倾斜薄矿脉采用中深孔采矿越来越多。为了降低生产成本，提高经济效益和安全系数。通过在矿房对扇形中深孔和平行中深孔进行现场试验，得到扇形中深孔比平行中深孔工程量少、千吨采切比小的结论。将扇形中深孔采矿方法在急倾斜薄矿脉中进行推广应用，取得了一定经济效益。     

Simultaneous extraction of gold and zinc from refractory carbonaceous gold ore by chlorination roasting process

A novel process based on chlorination roasting was proposed to simultaneously recover gold and zinc from refractory carbonaceous gold ore by using NaCl as chlorination agent. The effects of roasting temperature, roasting time and NaCl content on the volatilization rates of gold and zinc were investigated. The reaction mechanism and the phase transition process were also analyzed by means of SEM, EDS and XRD. The results demonstrated that under the optimal conditions of NaCl content of 10%, roasting temperature of 800 °C, roasting time of 4 h and gas flow rate of 1 L/min, the rates of gold and zinc were 92% and 92.56%, respectively. During low-temperature chlorination roasting stage, a certain content of sulfur was beneficial to the chlorination reactions of gold and zinc; and during high-temperature chlorination roasting stage, the crystal structure of vanadium-bearing mica was destroyed, and the vanadium-containing oxides were beneficial to the chlorinating volatilization of gold and zinc. Eventually, the chlorinated volatiles of gold and zinc could be recovered by alkaline solution.     

海洋平台厚板焊后热处理的豁免判据

对焊后热处理豁免的几种判断方法进行了介绍和比较,着重介绍了工程临界评估方法,以及如何将该方法用于焊后热处理必要性的评估工作。最后以某一海洋平台海上接桩焊后热处理工作为例,定量地分析了结构中允许存在缺陷尺寸、使用应力以及断裂韧性等因素对结构安全性的影响,为海洋平台厚板焊后热处理豁免提供了新的依据。     

非对称因素对热轧纯钛中厚板出口楔形的影响

针对纯钛中厚板热轧过程中可能出现的轧件断面楔形问题,结合四辊轧机设备和工艺的非对称特点,基于影响函数法建立双悬臂梁辊系弹性变形模型,研究对中误差、机架刚度差、坯料楔形、横向温差等非对称因素对轧件断面楔形的影响。结果表明对中误差、机架刚度差、横向温差对出口楔形的影响随着板宽和压下量的增大而增大,入口楔形对出口楔形的影响随着板宽增大和压下量的减小而增大。