关于砂金工艺矿物学研究规范化的建议

本文从样品的采集、加工、制备到砂金性状、矿砂物质组成;从分离、鉴定质量要求到选矿产品考察;从矿砂可洗性、可选性评价到矿砂工艺类型确定等项内容的系统化、标准化,阐述了砂金工艺矿物学的研究规范。     

Review of Operating Experience Of Ozone Systems In Municipal Plants In The United States

The treatment chemical ozone has now been successfully used in the United States in municipal water and wastewater plants for many years. To insure continuous, successful operations of these applications, operating obstacles had to be dealt with and overcome.

In this paper, examples of field operating problems and their solutions are described. The experiences at specific municipal water and wastewater installations are reviewed in detail. Discussed for each example are : the background and effects of the problem, the problem-solving process, and the eventual resolution of the problem. The examples include simple unit operations to entire processes.

By observing the ozone installation's operation several years after start-up, the design of future ozone systems can be improved and operating problems minimized.     

勘查砂金的最新技术KJ法

本文介绍了朝鲜民主主义人民共和国金策工业大学金致崇教授发明的根据磁场调查勘查砂金的最新技术(简称KJ法)。这项技术是不用钻探和井探,而只用仪器探出砂金的矿体形状、大小、埋深及品位。     

滩海敷管船用张紧器

管线张紧器是敷管船的关键配套设备,为了加快我国滩海油田的开发,我们研制成功了滩海敷管船用张紧器, １９９８年进行了现场试验,并于 １９９９年 ３月通过中国石油天然气集团公司组织的、以中国工程院院士顾心怿为首的专家鉴定。     

Where to for Brazil's Cities? Citizen Empowerment or Global Marketing?

An awakening interest in public space in Brazilian cities is emphasising the value of existing civic areas. Guilherme Wisnik , a critic, curator and professor at the Faculty of Architecture and Urbanism of the University of São Paulo, looks at the history and potential future of Brazil's urban spaces. He highlights how despite the introduction of innovative Modernist design in the mid-20th century, which forged ‘a new relationship between architecture, urbanism and landscape design’, more recently the country's cities have been subject to the vicissitudes of market and political forces.     

煤泥作还原剂对海滨钛磁铁矿直接还原焙烧磁选的影响

以印尼某海滨钛磁铁矿为原料, 煤泥作还原剂, 研究了煤泥种类及用量、添加剂用量和直接还原焙烧过程中的焙烧时间、焙烧温度等对铁产品TFe品位与回收率、TiO₂含量的影响。结果表明, 煤泥可代替煤粉作还原剂;通过煤泥与添加剂的共同作用, 能够达到降低最终直接还原铁中钛含量的目的。在煤泥TJ用量18%、添加剂YSE用量8%、YHG用量3%, 1 250 ℃下焙烧60 min时, 得到的焙烧产物经过两段磨矿两段磁选, 最终铁产品中全铁品位达92.72%, 回收率达91.93%, TiO₂含量降至0.72%。     

长江口水域砂矿资源及其合理开发利用

长江河口地区水下砂体发育形成了良好的砂矿资源,具有开发利用前景.分析砂矿资源的分布特点、沉积规律与物质组成,探讨合理利用的途径及其开发过程中须注意的环境地质问题.水域砂矿资源可为长江口岸带经济圈的基础建设与土地增殖提供重要物质来源.     

电感耦合等离子体质谱法测定砂金中稀土元素

建立了砂金中15种稀土元素的电感耦合等离子体质谱测定方法。考察了基体Au的谱线干扰及基体效应,采用In内标补偿基体对待测信号的抑制作用。仪器检测限为0.000 9～0.002 9μg/L,加入标准物质的回收率为98%～106.7%,分析结果的相对标准偏差（RSD）为0.33%～1.79%。该方法简单、快速、灵敏、准确。     

中国南方岩溶砂锡矿的分布

岩溶砂锡矿是中国南方第四纪沉积物中的一种重要矿床类型,具有矿层厚、品位高、工业价值大等特点。本文介绍了中国南方岩溶砂锡矿的分布规律、主要矿床类型,并指出了该区的找矿方向。     

尾矿库干滩长度在线测量的固定剖面推算法

通过分析当前干滩长度在线测量坡度推算法存在的问题,提出了固定剖面推算法,假定干滩坡面总是以一近乎固定曲面抬升,通过人工实测拟合出初始干滩面曲线,建立干滩面的库长-坝高坐标系,再结合坝顶外坡函数与库水位函数计算出尾矿库干滩长度与滩顶高程,并提出了实现流程软件。该方法较传统坡度推算法精度高、费用低,大大完善了干滩长度在线测量方法。