Upper Cretaceous–Cenozoic clay minerals of the Baikal region (eastern Siberia)

The Baikal region is located in a single climate zone and includes the Baikal foredeep on the eastern margin of the Siberian craton and the Baikal rift evolving at the western boundary of the Baikal orogenic area. Late Cretaceous–Cenozoic deposition in the two dissimilar tectonic units occurred in different environments, which is recorded in the architecture of sedimentary sequences and in the stratigraphic distribution of clay mineralogy.Clay minerals are mostly derived from weathered rocks of different ages. The geological ages of the source weathering mantles and their regular changes in different tectonic and climatic conditions can be inferred from the stratigraphic position in the Upper Cretaceous–Cenozoic sedimentary sequences that fill the Baikal foredeep. These inferences agree with data on fossil soils, flora, and fauna. Clay minerals show genetic relationships with stages of postdepositional alteration and processes of soil formation and hydrothermalism.In general, the Cenozoic history of erosion, deposition, and postdepositional changes of rocks in the Baikal region has been controlled by the interplay of climate and tectonic factors.     

Effects of applying sodium and sulphur fertilisers on the concentrations of elements in water leached from permanent pasture

The element composition of water leached from a perennial ryegrass pasture to which isonitrogenous quantities of sodium nitrate, ammonium nitrate or ammonium sulphate fertilisers had been applied in an experiment lasting 2 years is described. The experimental design also allowed a comparison of the immediate effects of sodium nitrate in the grazing season in which the fertiliser was applied with the residual effects of applying it in the previous year. Applying sodium fertiliser in either 1992 or 1993, but not both years, increased the concentrations of sodium, potassium, magnesium, calcium and cobalt and reduced those of phosphorus and molybdenum in leachate. The application of sulphur fertiliser reduced the concentrations of zinc, copper, iron and molybdenum in leachate. It also reduced the concentrations of sodium, potassium and magnesium, but only when sodium fertiliser was applied in 1992, and not when it was applied in 1993. It is concluded that sulphur fertiliser reduces the leaching of trace elements from the soil and that, in the long term, sodium fertiliser can amplify the effect of applying sulphur fertiliser. Sodium fertiliser in moderate quantities increased the leaching of the major divalent cations but reduced the phosphorus and molybdenum concentrations in leachate. © 2002 Society of Chemical Industry     

Improvement of the magnetic properties of iron-bearing minerals during radiation-thermal treatment

The changes in the magnetic properties of sulfide and iron-bearing minerals, such as siderite, chalcopyrite, and marmatite, are investigated. The specific magnetic moment of these minerals sharply varied during radiation-thermal treatment. The X-ray diffraction method confirms the fact that the magnetic properties of these minerals intensify due to formation of ferromagnetic phase of magnetite and maghemite.Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 89–97, July–August, 2004.The study was conducted with financial support from the Chinese State Fund of Natural Sciences, Project No. 59-87-4002.     

非金属矿物吸附剂在水处理方面的应用

粘土类非金属矿物具有良好的吸附和离子交换性能,在水处理方面有广阔的应用前景。各国研究者都对它们展开了大量的研究,以期取代价格昂贵的活性炭。本文介绍了几种常见矿物吸附剂的研究现状。     

硫化矿浮选电化学研究现状

介绍了硫化矿浮选电化学理论与技术的研究和应用现状，其中重点介绍了硫化矿物半导体性质、电化学研究发展现状。     

新资源的开发与新矿物加工技术的研究

本文分析了人类所面临的资源问题，用事实和数据说明我国矿物资源匮乏的危机，阐述了目前国际上的一些新的矿物加工技术，分析提出了矿业发展及矿物加工技术研究中应注意的问题。提出五大新矿物资源及开发顺序，并强调指出开发与利用再生资源应该得到重视。本文为矿物加工企业的发展、矿物加工技术的研究，提供了有价值的参考。     

粘土矿物在稀硫酸和碳酸钠浸出中的行为

研究了高岭石、伊利石、蒙脱石及其600—800℃脱水物在稀硫酸中的溶解性及酸耗。得出,高岭石酸溶性较小,蒙脱石较大,伊利石介于其间。经600—800℃焙烧后,高岭石脱水物酸溶性最大,蒙脱石脱水物的酸溶性急剧降低,伊利石亦介于其间。研究了粘土矿物在加压碳酸钠浸出中的碱耗,重点查明了高岭石与碳酸钠的反应产物。在低温(120℃以下)时反应产物以胶状多硅酸钠为主,高温(160℃以上)时反应产物以结晶羟方钠石为主。     

辽宁省的孔兹岩系

辽宁省的孔兹岩系主要分布于营口一草河口复向斜南北两翼，具有大致相同的岩石矿物组合、岩石化学及微量元素特征，经历了多期变形变质作用及混合岩化作用，具有同类的非金属矿产。     

云南普洱非金属矿产资源形势分析与研究

普洱市地处云南省西南部,是云南省唯一与三国接壤的地区,是我国通往东南亚陆上通道的重要门户之一,其非金属矿产资源丰富,开发潜力巨大,利用前景广阔,但地质勘查程度低,布局散乱,造成环境污染和资源浪费。因此,对普洱市非金属矿产资源形势分析与应策研究,对本省非金属矿工业发展具有一定的参考意义。     

转炉渣含铜矿物晶相优化工艺研究

研究了某转炉渣的化学组成与铜和铁的物相组成,查明了含铜矿物的赋存形式和嵌部特征。结果表明,炉渣冷却过程中其黏度会影响铜结晶的大小,氧化钙作为添加剂可以降低炉渣黏度,促进微细铜颗粒更好的结晶长大,实现晶相优化。