改性碳酸氢铵的结构特征及其肥效增效机理研究

利用有机-无机(矿物)控释材料对碳酸氢铵进行改性，制成改性碳酸氢铵。盆栽试验结果显示，在等重条件下，改性碳酸氢铵较普通碳酸氢铵有较大幅度的增产。运用X射线衍射分析及红外光谱对改性碳酸氢铵的结构进行研究，发现其晶体结构发生较大的变化，差热分析结果也表明，改性碳酸氢铵的热分解温度比普通碳酸氢铵提高30℃。这种晶体结构的变化增加了改性碳酸氢氨的稳定性，从而延长了其肥效并提高了N的利用率。     

机械卡盘设计中的计算误差分析与应用

通过对普通机构二维力因素影响的分析，利用修正公式计算求值，以修正单因素影响最大值计算所产生的误差。利用这一计算方法，对CD—3型钻机卡盘进行了计算，得到了正确的设计结果，说明用修正公式对多因素影响采用单因素影响最大值计算进行修正是可行的。     

新疆盐渍土分散性研究

通过研究分析盐渍土及改变盐渍含量对分散性试验的影响,认为土块试验、针孔试验对受高钠离子影响的盐渍土分散性评价是较为有效的方法。新疆土料石膏发育,环境水中Ca2+离子丰富,分散性评价最好在工程实际情况下进行。     

改性铝土矿与其它混凝剂净水性能对比的研究

改性铝土矿做净水剂，与市售其它混凝剂比较，具有ＰＨ值适用范围宽，对水中阴阳离子，尤其是对ＳＯ＾２－４的吸附能力强等优点。去除水中的浊度，颜色，ＣＯＤ等同于市售其它混凝剂。     

铝对铬成矿地球化学的依存性和对抗性

基于岩浆铬矿床与超镁铁质岩石的关系，从元素亲合性和共生规律的角度揭示了铝对铬成矿制约的主导作用，分析了铝和铬亲石、亲氧的二重性及其晶体化学的依存关系。论证了超镁铁Ｓｉ－Ｏ体系中铝丰度过高或过低均不利于铬的成矿。揭示了制约元素分散富集的因素都是在一定条件下互为依存和转化的，是在动态中的矛盾的对立和统一。     

硅酸盐样品微波加热碱熔分解方法

本文研究了硅酸盐样品在常压下，用微波炉进行碱熔分解的熔样时间，试剂用量和滴加水量等情况对分解的影响，确定了最佳实验条件，将此法用于地球化学标准参考样品ＳｉＯ２的测定，取得了满意的结果。     

氢氧化钠预处理对提高泡塑富集金能力的探讨

用氢氧化钠处理的泡塑对金的回收率高，富集能力强，并根据金的分布情况对影响泡塑富集能力的原因进行了探讨，为泡塑分离富集金的分析提供了一种新的泡塑予处理方法。     

云南墨江金厂金矿床含铬层状硅酸盐矿物成分标型特征

含铬绢云母类矿物在云南墨江金厂金矿床中广泛出现于黄铁铬绢英岩、黄铁硅质岩、黄铁铬云母岩和石英脉中。含铬绿泥石类矿物主要出现在石英脉、硅质岩、黄铁铬绢英岩中。蒙脱石出现于蚀变围岩中，而高岭石出现于富金石英脉中。本文通过对72个上述矿物电子探针数据的分析，确定了与其成因产状对应的含铬绢云母、含铬伊利石、含铬绿泥石、含铬蒙脱石、高岭石矿物的系列成分标型。研究表明，具最高铬含量的上述矿物样品均位于近金厂岩体穿脉的最北端。在铬铝云母SiO2-Cr2O3关系图上可以看出，不同成矿背景的铬铝绢云母，其Cr、Si离子数有分区特点，而本矿床的铬铝云母成分标型反映其富硅富铬的特点，与金厂超基性岩体的变质热液有关。     

Precise/ Small Sample Size Determinations of Lithium Isotopic Compositions of Geological Reference Materials and Modern Seawater by MC-ICP-MS

The Li isotope ratios of four international rock reference materials, USGS BHVO-2, GSJ JB-2, JG-2, JA-1 and modern seawater (Mediterranean, Pacific and North Atlantic) were determined using multi-collector inductively coupled plasma-mass spectrometry (MC-ICP-MS). These reference materials of natural samples were chosen to span a considerable range in Li isotope ratios and cover several different matrices in order to provide a useful benchmark for future studies. Our new analytical technique achieves significantly higher precision and reproducibility (< ± O.3%o 2s) than previous methods, with the additional advantage of requiring very low sample masses of ca . 2 ng of Li.     

Improved Platinum-Group Element Extraction by NiS Fire Assay from Chromitite Ore Samples Using a Flux Containing Sodium Metaphosphate

Many chromite-rich rocks contain relatively high concentrations of the platinum-group elements (PGE). In many cases, the phases carrying PGE occur as either platinum-group minerals (PGM) or as base metal sulfides in solid solution in sulfides. In some cases, such as the UG-2 unit of the Bushveld Complex, the PGM are occluded inside chromite grains. Chromites are notably difficult to dissolve in most fluxes and if the chromite contains some PGM the possibility exists that not all the PGE will be recovered during fusion. In this work, shortcomings in published methods of analysis based on the nickel sulfide fire assay procedure were investigated and a new procedure developed based on the addition of sodium metaphosphate to the fusion mixture. Optimum composition of the fusion mixture was found to be 10 g sodium metaphosphate and 9 g silica to 10 g sample, 15 g sodium carbonate, 30 g lithium tetraborate, 7.5 g nickel and 4.5 g sulfur to achieve complete dissolution of chromite grains. The new flux mixture was evaluated by the analysis of reference material CHR-Pt+ (which is known to contain PGM inside chromite grains) and no undissolved chromite grains were found in the glassy slag. Analysis of the nickel sulfide beads from this fire assay using neutron activation analysis showed similar results for Rh and Ru when compared with published conventional true (or accepted) values, while Au, Ir, Os, Pd and Pt values determined here were 10 to 30% higher than the corresponding published conventional true values. It was concluded that the addition of sodium metaphosphate improved chromite dissolution in the flux and appears to improve PGE recovery.