盐湖化学的前沿     

高世扬 《盐湖研究》1993,1(2):47-52

盐湖化学(是盐湖资源化学的简称)是研究天然盐成盐元素的化学,包括成盐地球化学,盐水溶液化学,成盐元素化合物的固体化学,盐湖资源开发利用过程中盐类的分离和提取,盐产品的专用化和高值化化学。本文从成盐元素与生命科学,与能源和材料科学,盐溶液化学和盐湖资源化学等方面对盐湖化学的前沿进行了探讨。  相似文献   

吉兰泰盐湖沙害综合治理   总被引：3，自引：0，他引：3  

杨恒贵  张志广 《中国沙漠》1994,14(2):64-68

吉兰泰盐场１９８３年开始运用生物、工程等各项综合沙漠治理技术措施，在流沙危害严重地区建立防护林体系，总结出了适地适树，片状、带状配置，形成乔、灌、草有机结合的防护林带。并对人工林采取喷灌措施提高造林成活率和促进林木及林下植被生长；此外，还配合工程固沙措施修筑１×１ｍ￣２、１×２ｍ￣２网格状粘土沙障提高防风沙效果。  相似文献   

Business cycles and forecasts of industrial minerals use     

Mark C. Roberts 《Natural Resources Research》1994,3(4):315-324

The future markets for industrial minerals depend on the business cycles of the industries that use these minerals. In this study, I develop a method to establish the relationships between the cycles in major sectors of the economy and the markets for minerals. This method is demonstrated for the use of cement, gypsum, salt, and asbestos in the United States since World War II. Assuming that past relationships will continue, we can forecast consumption for these minerals based on predictions of future trends in the economy.  相似文献   

察尔汗盐湖霍布逊区段S3盐层晶间卤水分异特征及成因     

徐少康 《盐湖研究》1994,2(1):1-5

本区段Ｓ３盐层晶间卤水在铅直方向上的均一性，是用瓦里亚什科（М．Г．ВаЯШКО）的“重力垂直分异”观点解释本湖晶间卤水分异问题时，遇到的不可克服的困难之一．本文用统计分析和系统理论的方法，研究了本地段Ｓ３盐层晶间卤水分异特征及成因，结论表明：“阶段性淡化”说在本区段也是成立的．  相似文献   

盐湖形成过程中银的迁移形式及富集条件   总被引：1，自引：1，他引：1  

郑大中 《盐湖研究》1994,2(2):28-35

本文研究了盐湖形成过程中银的迁移形式及富集条件．在热液中银主要以Ａｇ（ＨＳ）￣－＿２·Ａｇ（ＮＨ３）·ＡｇＣｌ络合物形式迁移；在表生条件下银主要以Ａｇ（Ｓ２Ｏ３）络合物形式迁移．它们在盐湖中被演化为ＡｇＣｌ络合物，由于湖水大量蒸发、盐类大量结晶析出，导致盐湖卤水中银的富集．  相似文献   

再论察尔汗盐湖察尔汗二级补给系统S3盐层晶间卤水分异问题          下载免费PDF全文

徐少康 《盐湖研究》1994,2(4):1-8

本湖Ｓ_３盐层晶间卤水（简称晶卤）分异与钾盐矿床成因密切相关．察尔汗二级补给系统范围是晶卤分异最复杂的地区，为晶卤钾矿首采区，固、液态钾盐均有可观的储量，因此，深入研究本区晶卤分异问题，有助于进一步理解“阶段性淡化”说全部内容及本区钾盐资源充分利用研究．本文详细列示了晶卤总体、三级补给系统及垂直分异区在平、剖面上的分布，据此，可知其三维空间分布状况，准确预测任意切面、方向及位置晶卤的状态，并就许多问题进行了论述，有一定理论和经济意义．  相似文献   

Experimental frost and salt weathering of chalk—I     

L. C. Jerwood  D. A. Robinson  R. B. G. Williams 《地球表面变化过程与地形》1990,15(7):611-624

To try to resolve the conflicts surrounding the influence of salts on frost weathering, chalk cubes were immersed, separately, in solutions of sodium chloride, sodium sulphate, and magnesium sulphate at concentrations of 5·5 per cent and 12·5 per cent, in a mixed solution of sodium chloride and sodium sulphate, and in distilled water. The cubes were subjected to six freeze-thaw cycles with temperatures ranging from either +15 to — 10°C or + 15 to — 30°C. The results confirm that frost weathering can be enhanced by the presence of certain salts, but the degree of enhancement depends both on the concentration and type of salt and on the intensity of the freeze-thaw regime. Some, but not all, of the results can be explained by the phase changes that occur during the freezing of the salt solutions.  相似文献   

Salt fretting in the valley cliff of the Asama volcano region,Japan     

Y. Matsukura  H. Kanai 《地球表面变化过程与地形》1988,13(1):85-90

On the pumice flow deposits of the Asama volcano, Japan, many salts such as halite (NaCl), gypsum (CaSO₄·2H₂O), hexahydrite (MgSO₄·6H₂O) and mirabilite (Na₂SO₄·10H₂O) crystallize at the base of south-facing valley cliffs. The zone of salt efflorescence and of resulting polygonal rind correspond to the zones of notch formation and high water content. The main conditions for salt crystallization and polygonal rind formation are: (1) the existence of groundwater containing a high concentration of Cl^?, SO, Ca²⁺, Mg²⁺, and Na⁺; (2) a valley cliff material with a high capillary action and small tensile strength; and (3) low humidity and a high ground-surface temperature derived from the direct incidence of sunshine. Given the right conditions, salt weathering can occur not only in the arid regions but also in humid, temperate inland regions.  相似文献   

Contour scaling of a sandstone by salt weathering under simulated hot desert conditions     

B. J. Smith  J. P. McGreevy 《地球表面变化过程与地形》1988,13(8):697-705

A laboratory study has been used to investigate relationships between salts and contour scaling—a weathering feature commonly observed on rock surfaces in salt-rich environments. Surface disaggregation and essentially surface-parallel cracks were produced in sandstone blocks using 10 per cent solutions of sodium sulphate and magnesium sulphate applied daily to single exposed surfaces for sixty days. A control block soaked once in saturated magnesium sulphate and subsequently wetted daily with distilled water showed extensive surface disaggregation, but no cracking. Both surface disaggregation and subsurface cracking were associated with relative concentrations of microcrystalline salt. A tentative model of contour scaling is proposed, which involves linking together potential cracks by salt-induced fracturing of intervening, crack-stopping grains. Further control blocks treated respectively with 10 per cent and saturated sodium chloride showed no evidence of subsurface cracking and only limited surface disaggregation of the ‘saturated’ block.  相似文献   

Habitat value of a developing estuarine brackish marsh for fish and macrocrustaceans   总被引：1，自引：0，他引：1  

Hampel  H; Cattrijsse  A; Vincx  M 《ICES Journal of Marine Science》2003,60(2):278-289

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