变质作用中氟的性状     

Aksy.  AM 白冶 《国外矿床地质》1995,(4):59-59

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GQ系列降氟器研制的几个关键问题     

曹继星  安振远 《河北地质学院学报》1995,18(2):199-201

防止电极极化，调整降氟反应的ｐＨ值，解决反应器的膜中毒，相关电路设计等是此仪器研制的关键。研究其产生机理，并采用相应对策解决这些问题。  相似文献   

俄罗斯滨海区两种类型的锂—氟烯有金属花岗岩     

Ｘ.  ЛＨ 朱佛宏 《地质地球化学》1994,(3):16-20

业已确定，兴凯岩体沃滋涅先期克构造的锂－氟花岗岩属于Ｓ型，而东锡霍特区季格林构造的花岗岩则属于Ａ型。证实了第一种类型花岗岩流变成因和第二种类型花岗岩形成于熔体的结晶作用。采用温压地球化学方法，测定了矿石－岩浆体系在不同构造中形成时深部流体成分的差别和该成分在时间上的变化特征。探讨了伴随沃滋涅先斯克和季格林构造花岗岩的形成过程金属矿化产生差异的原因。  相似文献   

元素分配与某些矿床分带关系及氯氟在元素迁移中的作用     

赵斌  赵劲松  陈松乔  柏天宝 《矿物岩石地球化学通报》1994,(1)

元素分配与某些矿床分带关系及氯氟在元素迁移中的作用赵斌，赵劲松（中国科学院广州地质新技术所，广州５１０６４０）陈松乔，柏天宝（中国科学院地球化学研究所，贵阳５５０００２）关键词分配系数，矿床分带，氟氯元素迁移我国南方大厂、东坡、个旧、香花岭、大吉山、...  相似文献   

Partitioning and Hydrolysis of Nb and Ta and Their Implications with Regard to Mineralization   总被引：4，自引：0，他引：4  

Yurong Wang  Fu Gu  Ziqiang Yuan 《中国地球化学学报》1993,12(1):84-91

K₂NbOF₅ · H₂O and K₂TaF₇ were prepared through melting Nb₂O₅ and Ta₂O₅ respectively with KHF₂ · 2H₂O, followed by recrystallizing. The hydrolysis properties of K₂NbOF₅ and K₂TaF₇ were determined again by using a rapidly quench vessel. As temperature (from 250 to 550 °C) and pressure (from 500 to 1500 bars) increase, the degree of hydrolysis of both K₂NbOF₅ and K₂TaF₇ will increase. Nb- and Ta-fluorine complex compounds are instable in supercritical aqueous fluids. The degree of hydrolysis of both K₂NbOF₅ and K₂TaF₇ decreases with increasing concentration of HF, independent of the concentration of NaF. The partition coefficients of Nb and Ta between granitic melt and fluid phase are less than 0.15, i.e., most of Nb and Ta are left in granitic melt. The partition coefficient of Ta is more dependent on the concentration of HF than that of Nb. The significance of hydrolysis in Nb- and Ta- mineralization is also discussed in the present paper.  相似文献   

REE Tetrad Effects in Rare—metal Granites   总被引：1，自引：1，他引：1  

赵振华  AKIMASAMASUDA 《中国地球化学学报》1993,12(3):206-219

Described in this paper are the characteristics of tetrad effects of REE in rare-metal granites.Based on the analytical data and experimental geochemical data available,it is pointed out that the tetrad effects of REE in the granites are produced in the metal-fluid system.Intense fractional crystallization of granitic melt(containing REE accessary minerals)and its interaction with volatile-rich(F,Cl)fluid are the major factors leading to the tetrad effects of REE.From this,this paper presents a composite genetic model for high-degree fractional crystallization-volatile-rich fluid metasomatism of rare-metal granites.With the model,quantitative calculations have been made.Meanwhile,it is pointed out that the tetrad effects of REE can be used as an important indicator to distinguish mineralized granites from barren ones.  相似文献   

煤中氟的研究进展   总被引：3，自引：0，他引：3  

徐立荣  雒昆利  王五一  冯福建  谭见安 《地球科学进展》2004,19(1):95-099

在全面综合国内外研究文献的基础上,分析了煤中氟的含量、分布规律、赋存状态以及燃烧释放规律等方面的研究进展和存在的问题。我国煤中氟的研究总体上说滞后于煤中其它某些微量元素（如砷、硒、汞等）的研究。进一步深入研究煤中氟+K313的分布规律、赋存状态、来源及迁移转化规律,是今后煤中氟研究的重点。  相似文献   

地下水中氟含量与温度、pH值、(Na⁺+K⁺)/Ca²⁺的关系——以河南省永城矿区为例   总被引：3，自引：0，他引：3  

张威  傅新锋  张甫仁 《地质与资源》2004,13(2):109-111,95

氟是人体必须的元素之一,人体氟的主要摄入来源是饮用水.永城矿区是饮用水型地氟病发病区.地下水中氟的含量与水温、pH值以及地下水的水化学成分有关.从定性和定量方面讨论了矿区地下水中氟从固相转入液相的过程,详细讨论了水温、pH值以及地下水的水化学成分对该过程的影响.  相似文献   

Origin of high fluoride contents in groundwater of the Santa Maria Formation, Guarany Aquifer System, southern Brazil     

Ari Roisenberg Maria Paula C. Marimon Antonio P. Viero 《中国地球化学学报》2006,25(B08):121-121

Fluoride anomalies （up to 11 mg/L） have been detected in the porous confined Santa Maria Aquifer （Guarany Aquifer System） in the central region of Rio Grande do Sul State, southern Brazil, leading to endemic fluorosis. Two hypotheses are investigated concerning the fluoride origin： contamination by long-term phosphate-fertilizer application due to extensive tobacco plantation or lithogeochemical affiliation from regional rocks. The results are discussed based on statistical and geochemical modeling and stable isotope data of water, nitrate and sulfate. Field monitoring of phreatic and confined aquifer during two years and laboratory leaching and retention experiments were performed. Regional statistical analysis （factorial and cluster analysis） on the basis of 350 wells discriminates four different hydrochemical groups in the confined aquifer, considering magnesium, calcium bicarbonate, sodium chlorinate and sodium bicarbonate as specific parameters. The last two groups reach higher fluoride contents and represent deeper aquifer levels where geochemical modeling shows carbonates （calcite and dolomite） are of super-saturation. The laboratory experiments confirmed that local soils with high CTC and aluminum contents （Udults） represent an efficient geochemical barrier, preserving the aquifer from fluoride contamination and supporting remediation strategies for fluoride removal. δ^18O and δD groundwater data and the local meteoric water line （LMWL） indicate that local precipitation is the main groundwater recharge source in the area.  相似文献   

吉林省西部地方性氟、砷中毒现状及治理     

王静  沈玉萍  赵洪满  苏艳伟 《吉林地质》2006,25(1):62-65

吉林省西部是地方病高发地区,尤其是地方性氟、砷中毒的情况比较严重,尽管防氟改水工作已经进行40多年,但目前仍有相当多村屯的村民饮用高氟水,严重威胁人民的身体健康并影响当地的经济发展。针对现状作者分析了产生的原因并提出具体治理建议。  相似文献