巯基棉吸附富集—硫代米蚩酮光度法测定铁矿石中痕量金

试验了在１ｍｏｌ／ＬＨＣｌ介质中，巯基棉吸附富集Ａｕ，１０ｇ／Ｌ硫脲－０．５％ＨＣｌ溶液洗脱，硫代米蚩酮显色，分光光度法Ａｕ的方法，方法精密度，准确度均较好，已用于Ａｕ〈１０＾－６的铁矿原矿及选矿尾矿的测定。     

Gold Occurrence and Ore Genesis,Yata Micro—Disseminated Gold Deposit,Guizhou,Southwest China

The mode of occurrence of gold in the Yata micro-disseminated gold deposit is ap-proached through chemical phase studies coupled with ore-dressing monitoring and micro-beam analysis.The results showed that gold occurred for the most part as ultra-microscopic particles adsorbed on the surfaces or fracture planes of pyrite and other sulphides.The proportions of gold of different occurrences were estimated solutions containing nanometer-sized gold particles were prepared following the hydrolysis-reduction procedure and the adsorption of nanometer-sized gold on ordinary sulphides and rocks was experimentally determined.It is evident that sulphides are good adsorbents of gold and this is consistent with geological observations.     

Pressure Solution of Sulphides in Some Massive Sulphide Zinc—lead Deposits of Western Canada：Its Significance in Mobilization of Ore—forming Materials

Pressure solution is a common phenomenon in massive sulphide zinc-lead deposits of western Canada and may have been an important factor leading to the mobilization of ore-forming materials during diagenesis, deformation and metamorphism of sedimentary ores.The control of ductile shear zones over gold mineralization could be explained in view of pressure solution of gold-bearing miner-als under shearing stress and the tesultant mobilization of this metal.     

古风暴沉积的化石标志

本文根据广泛的野外观察对一些不同寻常的化石保存状态、化石的变形、不同化石群的混合以及化石个体的排列方式进行了研究,认为它们明显地受到过强度猛烈、产生突然、作用短暂的水动力作用。把这些现象与一般的波浪、底流、潮汐以至浊流作用的结果加以对照区别,认为他们可以与其它沉积学特征结合,共同作为识别古风暴沉积的标志。     

内蒙古维拉斯托锌铜矿床选矿试验研究

维拉斯托锌铜多金属矿床矿石中富含多种元素,其中铜、铅、锌、砷、银、钨、钴等元素具有综合利用价值,矿石类型属于比较难选多金属矿石.采用混合浮选铜铅（-0.076 mm为65%）-依次浮选锌、砷（钴）-再浮选钨-重选（摇床）选钨的选矿工艺流程,对选矿pH值、药剂种类及用量等系列选矿条件进行了实验研究,达到较为理想的选矿效果,为矿山生产提供了技术保证.     

五国化学会预警磷资源危机

<正>近日,中国、德国、日本、英国和美国五国化学会共同发布《化学给力全球可持续发展》报告,称当前全球磷肥产量已达峰值,并将在本世纪后期逐步下降,用于生产肥料的磷矿石资源有可能在未来的30～100年枯竭。因磷肥市场供不应求从而将进一步危及全球粮食产量。但报告同时指出化学家可以通过技术创新,开拓新的磷资源来源来应对这一挑战。