老卤蒸发—冷却结晶脱镁的研究          下载免费PDF全文

卢光磊  李海民 《盐湖研究》2010,18(2)

采用蒸发—冷却结晶方法,对青海大柴旦盐湖提钾后的老卤进行脱镁试验研究。试验结果表明,一次蒸发温度为125℃时,老卤的镁去除率达到了33%,蒸发冷却后卤水的流动性较好。一次蒸发温度在135℃时,老卤的镁去除率达到了74%以上,但蒸发冷却后的卤水流动性差,过滤性能不佳。二次蒸发采用125℃蒸发后的卤水为原料,没有达到预期效果。  相似文献   

油泉子钾矿床晶间卤水（KCl）自然蒸发试验研究          下载免费PDF全文

张兆广  祝云军 《盐湖研究》2009,17(4):27-31

油泉子矿床是一个以卤水钾镁盐矿为主的小型综合性盐类矿床,盐湖卤水水化学类型主要为氯化物型,从KCl等组分含量来看,属高钾高钠低镁的卤水。在柴达木盆地与油泉子条件相类似的盐类矿床中,氯化物型卤水钾的选矿工艺已十分成熟,但对于不同矿区不同组分含量的卤水,其结晶路线各不相同,为此,对油泉子矿床氯化物型卤水进行自然蒸发试验,确定盐类结晶析出顺序和钾矿物的最佳分离点,取得钾矿物的产率和钾石盐中KCl含量等基础数据,并对该类型卤水工业利用性能作出评价。  相似文献   

蒸发波导环境测量方法对比分析     

许晨  王心鹏  刘宁 《海洋技术学报》2019,38(1)

蒸发波导现象显著影响海上电磁波传播,快速获取大范围精确的修正折射率参数成为了蒸发波导研究热点。文中分析了现有的蒸发波导预测模型,对其中的经典模型进行了仿真,对比不同模型的仿真结果,总结了模型方法预测波导高度及修正折射率廓线的不足。然后从硬件角度出发对比现有蒸发波导测量系统原理、测量精度及适用条件,分析测量系统引入的误差源进而给出了不同测量系统的改进方向,总结出修正折射率廓线测量系统应具备的测量精度及数据条件。最后通过方法间对比及蒸发波导实测数据的应用过程分析,对不同方法未来的研究方向和发展趋势进行了展望。  相似文献   

托素湖湖水蒸发过程中析盐及其pH值的变化规律研究          下载免费PDF全文

张棣  马云麒  李兴意  杨剑  彭章旷  刘玉秀  马学海 《盐湖研究》2022,30(1):46-56

盐湖卤水蒸发是提取盐湖有益成分的主要途径之一,当前盐湖卤水的蒸发实验主要集中在矿化程度较高的盐湖和咸水湖中,蒸出矿物以硫酸盐和氯化物为主.为了获得湖水蒸发过程中从低矿化度到高矿化度全阶段的析盐和pH值变化规律,用托素湖微咸水在恒温室内开展28±2℃蒸发实验.托素湖为硫酸镁亚型微咸水湖(矿化度27.8 g/L),整个蒸发...  相似文献   

Recharge to the inter-dune lakes and Holocene climatic changes in the Badain Jaran Desert, western China   总被引：8，自引：0，他引：8  

Xiaoping Yang  Bingqi Zhu  Bing Xu  Zhibang Ma  Jiaqi Liu 《Quaternary Research》2010,73(1):10-116

We present new estimates on evaporation and groundwater recharge in the Badain Jaran Desert, western Inner Mongolia of northwestern China, based on a modified Penman Equation suitable for lakes in China. Geochemical data and water balance calculations suggest that local rainfall makes a significant contribution to groundwater recharge and that past lake-level variations in this desert environment should reflect palaeoclimatic changes. The chronology of lake-level change, established by radiocarbon and U-series disequilibrium dating methods, indicates high lake levels and a wetter climate beginning at ca. 10 ka and lasting until the late mid-Holocene in the Badain Jaran Desert. The greatest extension of lakes in the inter-dune depressions indicates that the water availability was greatest during the mid-Holocene. Relicts of Neolithic tools and pottery of Qijia Culture (2400-1900 BC) suggest relatively intensive human activity in the Badain Jaran Desert during the early and middle Holocene, supporting our interpretation of a less harsh environment. Wetter climates during the Holocene were likely triggered by an intensified East Asian summer monsoon associated with strong insolation.  相似文献   

察尔汗盐湖卤水蒸发速度影响因素的量化研究          下载免费PDF全文

李志伟  付振海  张志宏  李成宝  赵冬梅  马艳芳  张永明  王婧  苏彤  刘国建 《盐湖研究》2022,30(1):57-67

针对当前气象因素(辐照强度、风速、环境温度和相对湿度)与卤水因素(卤水温度和浓度)综合作用于卤水蒸发速度定量研究的数据缺乏等问题,采用室外蒸发装置及信号采集系统相结合的实验方法,开展了察尔汗盐湖卤水自然蒸发实验.借助多元线性回归分析方法对实验数据进行分析,建立了基于多因素共同作用下的卤水蒸发速度模型.实验结果表明,卤水...  相似文献   

黔东南气温变化对蒸发皿蒸发量的影响分析     

顾欣  康为民  龙先菊  张艳梅 《高原气象》2012,31(6):1761-1766

利用1980-2010年黔东南地区16个地面气象站逐月实测资料,采用灰色关联度方法分析了蒸发皿蒸发量对各气象要素的影响程度,通过经验正交函数分解方法(EOF)提取了第一特征向量场的时间系数并进行了Mann-Kendall突变检验和线性倾向估计分析,以及利用非线性回归方法建立数理模型确定气温变化对蒸发皿蒸发量的影响等。结果表明,黔东南地区的蒸发皿蒸发量与气温、湿度、降水量等因子有关系,并与气温的关系最为密切;同时,该地区气温出现了明显的升温趋势,即20世纪90年代中期是该地区年气温突变的关键时期,其气温倾向率为0.25℃.(10a)-1,通过了α=0.05显著性水平检验;在气温升高1℃的情况下,蒸发皿蒸发量增加了5.93%～8.04%,并自东向西逐渐递减,与海拔呈反相关关系。  相似文献   

Assesing the effect of an olive mill wastewater evaporation pond in Sousse, Tunisia     

Rakia S’habou  Moncef Zairi  Amjed Kallel  Abdelwaheb Aydi  Hamed Ben Dhia 《Environmental Geology》2009,58(3):679-686

Olive oil is a typical and valuable agro-industrial product in Mediterranean countries. In Tunisia, olive mill wastewaters (OMW) reach an amount of about 1,000,000 t year⁻¹ and constitute a serious organic pollution risk because of the high chemical oxygen demand values and the presence of phytotoxic and antibacterial polyphenols. OMW have been generally stored in pond sites to be eliminated by natural evaporation or valorised by spreading on cultivated soils or by composting. Many researches on the interactions of OMW with soils at laboratory scale (columns) have been reported, but less attention have been paid to the effect of OMW on soils at field scale. The aim of this work is to investigate an area used for >15 years as an uncontrolled OMW pond site. The transformations of soil properties and groundwater occurring during OMW storage were characterised by the pH, phenolic contents, electrical conductivity (EC), moisture content and organic contents. The soil samples were taken from two borings and compared to those of a control one located near the pond site. Groundwater samples were taken on the accessible and nearest water wells to the evaporation ponds. The permeable silty and sandy layers in the site support the infiltration of OMW near the evaporation ponds. This infiltration has reached a depth of 6 m at a distance of almost 50 m laterally. The results show that the OMW infiltration in the subsoil has affected the pH, EC, organic content, phenolic compounds and the moisture.  相似文献   

Monitoring Cenozoic climate evolution of northeastern Tibet: stable isotope constraints from the western Qaidam Basin,China     

Andrea B. Rieser  Ana-Voica Bojar  Franz Neubauer  Johann Genser  Yongjiang Liu  Xiao-Hong Ge  Gertrude Friedl 《International Journal of Earth Sciences》2009,98(5):1063-1075

Carbon and oxygen stable isotopic composition of Cenozoic lacustrine carbonates from the intramontane Qaidam Basin yields cycles of variable length and shows several distinct events driven by tectonics and climate changes. From Eocene to Oligocene, the over-all trend in the δ¹³C composition of lacustrine carbonates shows a shift toward higher values, possibly related to higher proportions of dissolved inorganic carbon transported to the lake or lower input of soil derived CO₂. At the same time, the δ¹⁸O composition of lacustrine carbonates is decreasing in accordance with the global cooling trend and northwards drifting of the whole region. During the Miocene, distinct isotopic events can be recognized, although their interpretation and linkage to a certain tectonic event remains difficult. These events may be related to uplift in the Himalayas, to the strongest phase of uplift in the Altyn Mountains, to pronounced subsidence of the Qaidam Basin or to the expansion of C4 plants on land. Generally cold, highly evaporative conditions can be deduced from enrichment of δ¹⁸O isotopic compositions during Pliocene and Quaternary times.  相似文献   

尕斯库勒盐湖卤水模拟自然蒸发试验研究   总被引：4，自引：3，他引：1       下载免费PDF全文

王丽娜  许建新  闵秀云  王亚静 《盐湖研究》2011,19(3):26-30

尕斯库勒湖是柴达木盆地众盐湖中较为典型的硫酸镁亚型盐湖。利用相图规律对该盐湖卤水自然蒸发的结晶路线进行了分析,并通过室内模拟自然蒸发试验进行了验证,最终获得了在自然条件下蒸发卤水分步结晶不同盐类的工艺路线,可为该盐湖资源综合利用提供依据。  相似文献