难选微细粒松软锰矿自磨解洗理论的探讨

简述针对矿石结构特点,采用多种特殊洗矿措施.阐述了自磨解洗的重要性,并查明了主要因素对指标影响的规律性.推导出矿粒在简体内的角速度运动方程和洗矿功的表达式.     

焦性没食子酸对硫化矿物的抑制性能和作用机理

研究了焦性没食子酸对硫化矿物浮选行为的影响及其作用机理，结果表明焦性没食子酸对方铅矿、黄铁矿、黄铜矿、闪锌矿具有抑制作用，对毒砂没有抑制作用，通过量子化学计算、亲固能计算以及能带结构分析等方法探讨了焦性没食子酸以硫化物的抑制机理。     

Clay minerals in surface sediments of the Pearl River drainage basin and their contribution to the South China Sea

Clay minerals have played a significant role in the study of the East Asian monsoon evolution in the South China Sea by being able to track oceanic current variations and to reveal contemporaneous paleoclimaUc changes prevailing in continental source areas. As one of the most important rivers inputting terrigenous matters to the northern South China Sea, the Pearl River was not previously paid attention to from the viewpoint of clay mineralogy. This paper presents a detailed study on clay minerals in surface sediments collected from the Pearl River drainage basin （including all three main channels, various branches, and the Lingdingyang in the estuary） by using the X-ray diffraction （XRD） method. The results indicate that the clay mineral assemblage consists dominantly of kaolinite （35%-65%）, lesser abundance of chlorite （20%-35%） and illite （12%-42%）, and very scare smectite occurrences （generally 〈5%）. Their respective distribution does not present any obvious difference throughout the Pearl River drainage basin. However, downstream the Pearl River to the northern South China Sea, the clay mineral assemblage varies significantly： kaolinite decreases gradually, smecUte and illite increase gradually. Additionally, illite chemistry index steps down and illite crystallinity steps up. These variations indicate the contribution of major kaolinite, lesser illite and chlorite, and very scarce smecUte to the northern South China Sea from the Pearl River drainage basin. The maximum contribution of clay minerals from the Pearl River is 72% to the northern margin and only 15% to the northern slope of the South China Sea. In both glacials and interglacials, kaolinite indicates that the ability of mechanical erosion occurred in the Pearl River drainage basin.     

Authigenic sulfide minerals and their sulfur isotopes in sediments of the northern continental slope of the South China Sea and their implications for methane flux and gas hydrate formation

This is a report of the study of the authigenic sulfide minerals and their sulfur isotopes in a sediment core (NH-1) collected on the northern continental slope of the South China Sea, where other geo-physical and geochemical evidence seems to suggest gas hydrate formation in the sediments. The study has led to the findings: (1) the pyrite content in sediments was relatively high and its grain size relatively large compared with that in normal pelagic or hemipelagic sediments; (2) the shallowest depth of the acid volatile sulfide (AVS) content maximum was at 437.5 cm (>2 μmol/g), which was deeper than that of the authigenic pyrite content maximum (at 141.5-380.5 cm); (3) δ 34S of authigenic pyrite was positive (maximum: 15‰) at depth interval of 250-380 cm; (4) the positive δ 34S coincided with pyrite enrichment. Compared with the results obtained from the Black Sea sediments by Jorgen-sen and coworkers, these observations indicated that at the NH-1 site, the depth of the sulfate-methane interface (SMI) would be or once was at about 437.5-547.5 cm and the relatively shallow SMI depth suggested high upward methane fluxes. This was in good agreement with the results obtained from pore water sulfate gradients and core head-space methane concentrations in sediment cores collected in the area. All available evidence suggested that methane gas hydrate formation may exist or may have existed in the underlying sediments.     

Water in granulites: implications for the nature and evolution of the lower continental crust

The lower continental crust is one of the most important sphere-layers in the deep earth, and is the direct place where the crust-mantle interactions occur. Granulites are the dominated rocks in the lower crust, and have critical implications for the knowledge of the composition, nature and evolution of the deep crust; fluids are important mediums influencing many geochemical, geophysical and geodynamical characteristics of the lower crust, and may also play a fundamental role in the petrogenesis of granulites and the formation of the lower crusts. In this paper, we review recent advances involved with the deep continental crust, granulites and fluids, and some long-standing debates. Combined with the Fourier-transform infrared spectroscopy (FTIR) analysis performed on the mineral assemblages (cpx, opx, plag and grt) in lower crustal granulite xenoliths and terrains (exposed section) from east China, it is suggested that structural water, dominated by OH, in these nominally anhydrous phases may constitute the most important water reservoir in the deep crust. This structual water may help to understand many lower crustal geological processes and phenomena (e.g. seismic activities and electrical conductive anomalies), and influences from these water must be taken into consideration.     

野生葛仙米矿物元素富集探讨

用电感耦合等离子体原子发射光谱法(ICP-AES)测定野生葛仙米、葛仙米生长环境地土壤表层及灌溉用水中部分矿物化学元素,结果表明各种矿质元素在葛仙米(干品)中的质量分数由高至低顺序依次为Ca、Mg、Fe、Sr、Mn、Zn、Cu、Co,其中Ca为34 030μg/g,Mn为129.1μg/g,Co为3.1μg/g,Sr为517μg/g;葛仙米Ca与土壤中Ca有明显的正相关关系,土壤中的Ca很容易被葛仙米同化吸收.葛仙米中的Sr与土壤和水中Sr有极明显的正相关关系,Sr非常容易被葛仙米富集;河水水源未检测出Mn、Zn、Cu.     

广西大学建设矿物资源工程专业的意义和做法

从广西大学采矿工程专业的改造、广西矿业发展需要等多方面论述了广西大学建设矿物资源工程专业的必要性和重要意义，并阐述了矿物资源工程专业课程体系、教学内容等的建设方案．     

吉林省非金属矿产合理开发利用的研究

本文通过概述非金属矿产业的重要战略地位,运用系统科学思想对吉林省非金属矿产资源及其外部环境进行了系统评价;用耗散结构理论及现代经济理论分析了如何提高非金属矿产业的组织化水平、如何建立一个稳定有序的开发利用格局;探讨了其发展的机制、战略产业所必须具备的条件及由此应制定的一些主要宏观政策措施;并运用系统工程的技术和方法,提出了具体的开发利用的策略或战略.     

岩石、矿物和自然环境中天然放射性剂量研究

采用北京核仪器厂生产的FJ-428型便携式多用辐射仪测定不同矿物、岩石以及湖南岳麓山、望城县桥驿洪家水库休闲度假区、西藏勒布旅游区等不同地质环境的放射性,表明高温高压下形成的矿物和岩石以及高温高压作用下形成的变质岩放射性剂量高,而沉积岩类和沉积类矿物放射性剂量低.不同矿物、岩石的α射线放射性剂量极低,放射性污染最主要的是γ射线污染.对放射性剂量高的矿物、岩石如花岗岩、板岩在一般情况下不适宜作室内建筑或装饰用材.