大量Li+存在对Mg2+分析测定的影响研究   总被引：5，自引：1，他引：5       下载免费PDF全文

王士强  高洁  余学  张宝军  孙柏  邓天龙 《盐湖研究》2007,15(1):44-48

在含锂盐湖卤水体系中,大量Li+的存在,对络合滴定法测定Mg2+易产生较大的干扰,使分析结果偏高。根据盐湖卤水体系中锂盐的含量,通过调整正丁醇和无水乙醇混合液的加入量可很好地抑制Li+的干扰,从而保证Mg2+分析结果的相对误差不超过0.3%。  相似文献   

溴化锂的生产工艺综述          下载免费PDF全文

魏述彬  邓小川 《盐湖研究》2006,14(3):58-62

综述了国内外溴化锂生产方法,并指出了每种方法的优缺点,同时展望了今后溴化锂生产方法的发展方向。  相似文献   

库仑法和电化学阻抗法测量LiFePO4锂离子扩散系数   总被引：1，自引：0，他引：1       下载免费PDF全文

王连亮  马培华  张琨  高成花  阎春燕 《盐湖研究》2009,17(3):52-55

库仑法和电化学阻抗法是测量锂离子扩散系数有效的测量手段。以实验室自制的LiFePO4为实验电池正极材料,介绍如何用库仑法和阻抗法测试并计算电极材料的锂离子扩散系数。库仑法计算得到锂离子扩散系数由Li1-xFePO4(x=0)的9.6×10-9cm2.s-1变化为Li1-xFePO4(x=0.7)的1.1×10-11cm2.s-1。用阻抗法的两种模型,分别计算了Li1-xFePO4(x=0.65)的电池材料的锂离子扩散系数,结果分别是8.5×10-11cm2.s-1和3.1×10-12cm2.s-1。三种方法的计算结果接近。  相似文献   

Insights into Li and Li isotope cycling and sub-arc metasomatism from veined mantle xenoliths,Kamchatka   总被引：3，自引：2，他引：1  

Ralf Halama  Ivan P. Savov  Roberta L. Rudnick  William F. McDonough 《Contributions to Mineralogy and Petrology》2009,158(2):197-222

Harzburgitic xenoliths cut by pyroxenite veins from Avachinsky volcano, Kamchatka, are derived from the sub-arc mantle and record element transfer from the slab to the arc. Olivine and orthopyroxene in the harzburgites have Li isotopic compositions (δ⁷Li = +2.8 to +5.6) comparable to estimates of the upper mantle (δ⁷Li ~ +4 ± 2). The pyroxenite veins, which represent modal metasomatism and may therefore provide information about the metasomatic agent, have mantle-normalized trace element characteristics that suggest overprinting of their mantle source by an aqueous, slab-derived fluid. These include relative enrichments of Pb over Ce, U over Th and Sr over Nd. Li is enriched relative to the HREE, and ortho- and clinopyroxene from the veins are in Li elemental and isotopic equilibrium with each other and the surrounding harzburgite. Vein samples (δ⁷Li = +3.0 to +5.0) do not record a significant slab-derived δ⁷Li signature. These observations can be reconciled if slab Li diffusively re-equilibrates in the mantle wedge. Modeling demonstrates that Li equilibration of small (1–2 cm width) veins or melt conduits is achieved at mantle wedge temperatures within 10¹–10⁵ years. We conclude that strongly fractionated Li isotopic signatures cannot be sustained for long periods in the sub-arc mantle, at least at shallow (<70 km) depths. Electronic supplementary material  The online version of this article (doi:) contains supplementary material, which is available to authorized users.  相似文献   

Towards a Li barometer for bimineralic eclogites: experiments in CMAS     

Margaret Hanrahan  Gerhard Brey  Alan Woodland  Rainer Altherr  Hans-Micheal Seitz 《Contributions to Mineralogy and Petrology》2009,158(2):169-183

An eclogite barometer has profound importance in the study of upper mantle processes and potential application to diamond prospecting. Studies on the partitioning of Li between clinopyroxene (cpx) and garnet (grt) in natural samples have shown that this particular element is very sensitive to changes in pressure and could be calibrated as the barometer demanded for bimineralic eclogites. Experiments were performed from 4 to 13 GPa and 1,100–1,400°C in the CMAS (CaO, MgO, Al₂O₃, SiO₂) system with Li added as Li₃PO₄ to quantify this pressure dependence into a barometer expressed in the following equation: P = (0.00255T – ln K _d)/0.2351 where P is in GPa, T is in °C and K _d is defined as the partition coefficient of Li (in ppm) between clinopyroxene and garnet. The experimental pressures are reproduced to ±0.38 GPa (1σ) by this equation. This barometer is strictly applicable only to CMAS. Experiments at 1,300°C, 8–12 GPa showed that Henry’s Law is fulfilled for Li partitioning between cpx and grt in the concentration range of approximately 0.01–1 wt% Li. Direct application of the equation to experiments in natural systems performed at 1,300°C from 4 to 13 GPa consistently overestimates pressures by approximately 2 GPa. Electronic supplementary material  The online version of this article (doi:) contains supplementary material, which is available to authorized users.  相似文献   

Lithium isotopic disequilibrium of minerals in the spinel lherzolite xenoliths from Boeun,Korea     

Youngwoo Kil 《Journal of Geochemical Exploration》2010

Spinel lherzolite xenoliths found in Boeun, Korea, have protogranular to porphyroclastic textures and are enclosed in a Miocene alkali basalt. The lithium concentration and isotopic compositions of olivine, clinopyroxene, and orthopyroxene separates from the spinel lherzolite, and whole rocks of the spinel lherzolites and alkali basalt were determined by inductively coupled plasma mass spectrometry (ICP-MS) and multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). The lithium concentrations of the olivines and orthopyroxenes range from 2.2 to 5.0 ppm and from 2.1 to 6.4 ppm, respectively. In contrast, the clinopyroxenes have larger lithium concentrations, from 2.0 to 8.4 ppm, which reflect their preferential lithium enrichment. The lithium isotopic compositions (δ⁷Li) of olivines (-5.4 to + 3.5‰), orthopyroxenes (-11.4 to -0.1‰), and clinopyroxenes (-14.4 to -4.7‰) range far beyond the average mantle composition of + 4 ± 2‰. The lithium isotopic composition of the host rock, alkali basalt (3.4‰), is within the range of the intraplate and oceanic island basalts. The spinel lherzolites from Boeun exhibits strong elemental and isotopic disequilibria due to the different lithium and lithium isotope diffusion velocities in the olivine, orthopyroxene, and clinopyroxene minerals after eruption and magma cooling.  相似文献   

水盐体系中有干扰Li⁺离子存在下测定Mg²⁺浓度的掩蔽法研究   总被引：1，自引：0，他引：1       下载免费PDF全文

李红霞  姚燕  曾德文 《盐湖研究》2012,20(2):24-30

在水盐体系中,大量Li+的存在,对EDTA络合滴定法测镁有严重的干扰,使滴定结果偏高。采用体积比为1∶9的正丁醇与无水乙醇作掩蔽剂,探究其在不同Li+/Mg2+摩尔比、不同浓度、不同取样量下的适宜加入量,得出混合醇的加入量与Li+/Mg2+摩尔比有较大关系,与溶液浓度、取样量的多少均无明显关系;同时指出在同一Li+/Mg2+摩尔比下混合醇的加入量有个适宜的范围。该方法的相对误差不大于0.3%。对提高含Li+和Mg2+的水盐体系相化学实验研究的可靠性和精度具有重要意义。  相似文献   

柴达木盆地西部第三系油田卤水资源可利用性分析   总被引：5，自引：11，他引：5       下载免费PDF全文

付建龙  于升松  李世金  任海燕 《盐湖研究》2005,13(3):17-21

通过对柴达木盆地油气钻孔资料的整理分析发现,对第三系地层中进行油气勘探时,经常伴有自井中喷出矿化度较高的卤水———油田水。通过对柴达木盆地构造演化分析,早期残留的古湖水经干旱蒸发条件,发生浓缩,将导致有用物质组分的富集;在此基础上,2002年对柴达木盆地西部第三系地层分布区的油井新取了水样,证实该卤水中含有较高的钾硼锂碘组分。通过盐田蒸发试验,可以得到质量较好的钾石盐、硼钾混盐、含锂碘的母液。  相似文献   

21世纪的能源金属—锂的冶金现状及发展   总被引：16，自引：3，他引：16       下载免费PDF全文

张明杰  郭清富 《盐湖研究》2001,9(3):52-60

从锂的资源出发 ,全面阐述了金属锂的应用 ,特别是在锂电池、航天航空合金材料 ,核骤变反应及有机合成方面的应用。评述了熔盐电解法、碳热还原法、氢热还原法、硅热还原法和铝热还原法的技术现状。指出各种方法存在的问题和研究方向 ,最后得出结认 ,金属锂是 2 1世纪的能源金属 ,在最近几十年中将得到迅猛的发展  相似文献   

锂合金的电解制备及性能研究 Ⅰ.合金循环伏安曲线与库仑效率          下载免费PDF全文

申承民  康永峰 《盐湖研究》1993,(3)

本文研究了五种锂合金在非水LiClO_4溶液中的循环性能,在三种不同的Al基质上形成的Li—Al合金的循环伏安曲线显示,合金主要由β—LiAl和α—LiAl合金组成,在三种Al材料中,Li在Al_2基质上的循环效率最高,在Pb和In与Li形成的合金中,LiIn合金具有较高的循环效率和良好的可逆性,实验表明,在Al_2基质上形成的LiAl合金和LiIn合金是非常有希望应用于二次锂电池的阳极材料。  相似文献