Determination of the ash yield and the mineral matter content of brown coals by density measurements

A method of measuring the density of bed-moist brown coals based on their plastic properties is described and the feasibility of using the method for determination of the ash yield of the coal is evaluated.     

Calculating soil nutrient balances in Africa at different scales

Nutrient balances were calculated for the arable soils of 38 sub-Saharan African countries. FAO production figures and forecasts for 35 crops for the period 1982–1984 and for 2000 were used to define land use systems, further characterized by fertility input through fertilizers, manure, rain and dust, biological N-fixation, and sedimentation, and fertility output through harvest of crops and removal of residues, leaching, denitrification, and erosion. The summarized output of the study is the sum of inputs minus the sum of outputs of nitrogen, phosphorus and potassium in the root zone. The alarming annual average nutrient loss for sub-Saharan Africa was 22 kg N, 2.5 kg P, and 15 kg K in 1982–84, and will be 26 kg N, 3 kg P, and 19 kg K in 2000. As the soil nutrient pool has to offset the negative balances each year, there is gross nutrient mining in sub-Saharan Africa. The need for integrated systems of nutrient management is emphasized, manipulating all inputs and outputs in a judicious way. Future scenarios of continued mining and conservation of soil fertility are discussed.     

高碱硅酸盐水泥熟料的SEM研究

采用扫描电子显微镜（SEM）和能谱仪（EDS）,观察和分析了熟料中的矿物形貌和化学组成,探讨了碱在熟料中的存在形式.研究结果表明,在高碱熟料中可以观察到有明显的硫酸盐存在,如Na2SO4,K2SO4,CaSO4或CaSO4·K2SO4;高碱熟料中碱更易进入硅酸盐矿物和铝酸盐矿物中,分别形成KC23S12、NCBA3;熟料中的碱（R2O）有一部分固溶在硅酸盐矿物和铝酸盐矿物中.     

新疆矿产资源的开发与生态环境的关系

从矿产资源开发与生态环境的关系出发,探讨了新疆矿产资源的特点及开发利用状况和新疆的生态环境特点及矿产资源开发对其影响,并提出了处理两者关系的意见。     

矿产资源综合利用分析和发展研究

我国矿产资源消耗日益增多,提高矿产资源的综合利用率已经成为一个重要的研究课题。通过对我国矿产资源特点和综合利用潜力的分析,针对我国矿产资源法律法规不健全,矿产资源综合利用水平低,企业规模小、资源乱采滥挖及"三废"问题进行研究,从政府、科研、企业、循环经济生产模式等方面入手提出了一些可行性的建议,为我国矿产资源的可持续性发展提供重要依据。     

河北金厂峪金矿床的数字矿床三维模型构建与空间展布规律分析

金厂峪金矿床的围岩为斜长角闪片麻岩和角闪岩类岩石,其遭受动力变质后形成片岩带与矿体密切相关。以探矿者软件为工作平台,建立了该矿床的三维数字矿床模型。通过收集和整理研究区的地质图、地形图、勘探线地质剖面图、钻孔柱状图,建立地质数据库;在此基础上,系统分析区域地质背景,总结区域成矿规律和控矿要素,构建主要控矿地质体的三维实体模型。从模型中清晰可见矿体主要赋存在片岩带中,且严格受构造控制,呈脉状产出,从而证实了三维数字矿床模型的有效性。     

应用DSR评价沥青胶浆路用性能的研究

沥青胶浆是沥青混合料的重要组成部分,但是由于试验条件与手段的限制,我国对沥青胶浆的研究不多,针对这一问题,利用动态剪切流变仪（DSR）,研究沥青胶浆性能以及胶浆中矿粉和纤维对它的路用性能的影响,研究结果表明,矿粉与纤维可以显著提高沥青胶浆的高温性能,但是,不适当的增加矿粉与纤维用量将损伤沥青胶浆的疲劳性能。     

Influence of copper minerals on cyanide leaching of gold

Ｔｈｅｒｅａｒｅｓｏｍｅｒｅｐｏｒｔｓａｂｏｕｔｔｈｅｉｎｆｌｕｅｎｃｅｏｆｃｏｐｐｅｒｏｎｇｏｌｄｃｙａｎｉｄａｔｉｏｎ[1 2 ] .Ｉｔｉｓｇｅｎｅｒａｌｌｙｃｏｎｓｉｄｅｒｅｄｔｈａｔｃｏｐｐｅｒｍｉｎｅｒａｌｓｂｒｉｎｇａｂｏｕｔｎｅｇａ ｔｉｖｅｅｆｆｅｃｔｓｏｎｃｙａｎｉｄｅｌｅａｃｈｉｎｇｏｆｇｏｌｄ .Ｈｏｗｅｖｅｒ,ａｌｏｔｏｆｆｉｅｌｄｐｒａｃｔｉｃｅｓａｒｅｎｏｔｉｎｃｏｍｐｌｅｔｅａｇｒｅｅ ｍｅｎｔｗｉｔｈｓｕｃｈａｃｏｎｃｌｕｓｉｏｎ .Ｉｔｉｓｏｆｔｅｎｔｈｅｃａｓｅｆｏｒｓｏ…     

水胶比及矿物掺和料对净浆塑性收缩影响

采用自行设计测定塑性收缩的方法,对不同胶凝材料净浆在不同水胶比情况下的塑性收缩变化规律及矿物掺和料对塑性收缩的影响进行了研究。试验结果表明,净浆塑性收缩与水胶比有关;水胶比为0.28~0.35时,塑性收缩随水胶比的增加而减小,而在0.35~0.45范围内随水胶比的增加而增加;矿物掺和料的品种及掺量对净浆的塑性收缩也有很大的影响。     

The Corrosion Fatigue Properties of High Performance Concrete

With the loading test equipment of corrosion fatigue specially designed, the corrosion fatigue charncteristics of high performance concrete (HPC) withstanding the interaction of third poim fatigue loading and Na2 SO4 solution were investigated and analyzed. The experimental results indicate that water-binder ratio evidently influences the corrosion fatigue characteristics of HPC, and a moderate quantitative fine mineral admixture enhances the corrosion fatigue resistance of HPC. The effect is more significant when fly ash and silica fume are added.