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Crystallization,Mechanical,Thermal and Rheological Properties of Polypropylene Composites Reinforced by Magnesium Oxysulfate Whisker

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Chinese Journal of Polymer Science 2017年第5期35卷 659-671页

作者： Li Dang Xue-ying Nai Xin Liu Dong-hai Zhu Ya-ping Dong 李武 Key Laboratory of salt Lake Resources Chemistry Qinghai Institute of Salt LakesChinese Academy of Sciences Key Laboratory of Comprehensive and Highly Efficient Utilization of salt Lake Resources Qinghai Institute of Salt Lakes Chinese Academy of Sciences University of Chinese Academy of Sciences

Polypropylene （PP） composites containing magnesium oxysulfate whisker （MOSw） or lauric acid （LA） modified MOSw （LAMOSw） were prepared via melt mixing in a torque rheometer. The heterogeneous nucleating effect of LAMOSw was clearly observed in polarized light microscopy （PLM） pictures with the presence of an abundance of small spherulites. MOSw exhibited no nucleation effect and formed a few spherulites with large size. Compared with PP/MOSw composites, PP/LAMOSw exhibited better impact strength, tensile strength and nominal strain at break, ascribing to three possible reasons：（i） more β-crystal PP formed, （ii） better dispersity of LAMOSw in PP matrix and （iii） the plasticizing effect of LA. The results of dynamic mechanical thermal analysis （DMTA） indicated that brittleness of the PP matrix at low temperature was improved by the addition of LAMOSw, while the interracial interactions between MOSw and PP matrix were actually weakened by LA, as evidenced by the higher tan8 values over the entire range of test temperatures. In terms of the rheological properties of the composites, both the η＊ and G＇ at low frequencies increase with the addition of MOSw or LAMOSw, indicating that the PP matrix was transformed from liquid-like to solid-like. However, a network of whiskers did not form because no plateau was found in the G＇ at low frequencies. With low filler content, LAMOSw produced a stronger solid-like behavior than MOSw mainly due to the better dispersion of the LAMOSw in PP matrix. However, for highly-filled composites, the η＊ of PP/LAMOSw at low frequencies was smaller than that of PP/MOSw composite, since the particle- particle contact effect played a major role.

关键词： PP/MOSw composites Crystallization Thermal properties Mechanical properties Rheological properties

Study on phase diagrams and properties of solutions in ternary systems Li+,K+(Mg2+)/SO42--H2O at 25℃

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Chinese Journal of Chemistry 1995年第2期13卷 112-117页

作者： LI,Bing LI, Jun FANG, Chun-Hui WANG, Qing-Zhong SONG, Peng-Shengqinghai institute of salt lakes, Chinese Academy of Sciences, Xining, qinghai 810008, China SU.EDU qinghai institute of salt lakes Chinese Academy of Sciences Xining Qinghai 810008 China

Solubilities of ternary systems Li+,K+/SO42--H2O (1) and Li+,Mg2+/SO42-H2O (2) were investigated by isothermal method at 25℃. Physico-chemical properties of solutions, such as density, refractive index, viscosity, conductivity and pH, were determined. Phase diagram of the system (1) consists of three solubility branches and three crystallization fields corresponding to K2SO4, Li2SO4.H2O and LiKSO4. LiKSO4 is an incongruent compound, and its transition point is estimated graphically to be 45.5-46.0℃. No solid solution of LiKSO4 with Li2SO4.H2O was found in the system. The system (2) is a simple eutonic type. Pitzer model of electrolyte solution was used to check the obtained solubilities. Data comparison gives good agreement. Two equations were used to correlate density, refractive index of the solution with its composition. Differences between measured and calculated values are less than 0.6% for density, 0.15% for the latter.

关键词： salt-water system solubility of Li salt phase diagram.

TEAR DROP PATTERN " POTASH DEPOSITS IN LACUSTRINE FACIES

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Chinese Journal of Oceanology and Limnology 1990年第1期8卷 50-65页

作者：孙大鹏 qinghai institute of salt lakes Academa Sinica Xining

It is well known that there are two patterns of potash deposition in lacustrine fades: " tear drop pattern " (the Dabsan saline lake is a typical example)and " bull’s eye pattern " . Potash-forming in tear drop pattern is still *** 2,678 m A . S. L . lake in the middle of the Qarhan playa in the Qaidam Basin covers an area of 210 km2 , and has an average depth of 0.39 m. Its MgCh type surface brine is 280-340 g/1 in salinity and mainly consists of Na, K, Mg and Cl. As a rule, the potash deposits occur as evaporite distributed in tear drop pattern at the northern and northeastern lakeshore zones. They mostly consist of carnallite and halite, occasionally *** deposition is very unstable and controlled principally by the varying supply of deposit materials from the Golmud River in the *** potash deposits were formed when concentration of the surface brine reached a certain degree in the main evaporating season. Their forming process followed some crystalization paths in the phase

关键词： lacustrine salinity mostly season sedimentary occasionally unstable continuing saline fresh

PRELIMINARY STUDY ON DEPOSITING RATE OF qinghai LAKE AND ITS EVOLUTION OF PALEOCLIMATE

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Chinese Science Bulletin 1989年第17期34卷 1457-1462页

作者：黄麒孙宁军 qinghai institute of salt lakes Academia Sinica Xining

The qinghai Lake is the biggest plateau brackish water lake in China. In 1981, the average water level is 3193.92 m, the maximum depth is 27 m, and the area is 4340 km^2. Several million years ago, the lake deposited continuously, which is profitable for the study of paleoclimate evolution since the Late Pleistocene. On the basis of previous studies,

关键词： depositing rate evolution of paleoclimate

A Multi–fluid Constrain for the Forming of Potash Deposits in the Savannakhet Basin: Geochemical Evidence from Halite

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Acta Geologica Sinica(English Edition) 2018年第2期92卷 755-768页

作者： REN Qianhui DU Yongsheng GAO Donglin LI Binkai ZHANG Xiying LIU Xiuting YUAN Xiaolong qinghai institute of salt lakes Chinese Academy of Sciences qinghai Provincial Key Laboratory for Geology and Environment of salt Lake University of Chinese Academy of Sciences

The Khorat Plateau on the Indochina Terrane is known to have formed during the closure of the Tethys Ocean, although the origin of its potash mineral deposits is a topic of current debate. Data from a borehole on Savannakhet Basin is used in this study to re-define the evaporation processes of the study area. Geochemical analyses of halite from various borehole-derived evaporite strata have elucidated the fluid sources from which these ores formed. Measured δ11 B indicated that ore deposits formed primarily due to evaporation of seawater, although non-marine fluids affected the later stages of the evaporation process. Fluctuations in B and Br concentrations in carnallite-and sylvite-rich strata indicate the influence of fresh water. Boron concentration in carnallite unit indicated the influence of hydrothermal fluids. From the relative timings of these various fluid influxes, the evolution of these evaporates can be divided into four stages:(1) an initial marine evaporation at the beginning of the deposit’s formation, where seawater(and minor fresh water) trapped on the uplifted Khorat Plateau produced sediments and salts with Br contents lower than those of normal marine-derived evaporites;(2) a transgression stage, where seawater recharged the basin;(3) a hydrothermal infiltration stage, which was coeval with the late Yanshan movement; and(4) a stage of fresh water supply, as recorded by fluctuations in B and Br contents, inferring intermittent fresh water influx into the basin. Thus, although evaporites on the Savannakhet Basin primarily formed via marine evaporation, they were also influenced to a significant degree by the addition of non–marine fresh water and hydrothermal fluids.

关键词： Savannakhet Basin potash deposit boron isotopes geochemistry

Fungal spore record of pastoralism on the NE qinghai-Tibetan Plateau since the middle Holocene

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Science China Earth Sciences 2021年第8期64卷 1318-1331页

作者： Haicheng WEI Chongyi E Ronglei DUAN Jing ZHANG Yongjuan SUN Guangliang HOU Jingyi GAO Key Laboratory of Comprehensive and Highly Efficient Utilization of salt Lake Resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China qinghai Provincial Key Laboratory of Geology and Environment of salt lakes Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China qinghai Provincial Key Laboratory of Physical Geography and Environmental Processes School of Geographic ScienceQinghai Normal UniversityXining 810008China Academy of Plateau Science and Sustainability Qinghai Normal UniversityXining 810008China

Pastoralism is considered a crucial factor in the eventual year-round occupation of high-altitude regions(>3000 m asl)of the qinghai-Tibetan Plateau,and the northeastern qinghai-Tibetan Plateau(NE-QTP)was an important corridor for early human *** analyzed fossil fungal spore records for the last 8500 years from a high resolution aeolian section at Langgeri(LGR)on the ***-two fungal spore types were identified in the LGR section,including seven coprophilous *** combined analysis of coprophilous fungal spores,Cyperaceae,Artemisia,and Hippophae pollen,and the charcoal>50µm fraction to explore the timing and controls of pastoralism on the NE-QTP since the middle *** commenced at LGR shortly before ca.5.5 ka and gradually increased between ca.5.5–3.5 ka,but markedly intensified after ca.2.2 ka,with three periods of growth at ca.2.1–1.9,1.4–1.2,and 0.6–0 ka,and a decline at ca.1.1–0.6 *** timing of changes in pastoral activity on the NE-QTP based on the coprophilous fungal spore record is supported by regional archeology and historical *** and political developments,rather than climate change,played key roles in the long-term fluctuations of regional pastoralism on the NE-QTP in the late Holocene.

关键词： Coprophilous fungal spores Pastoralism qinghai Lake basin Holocene qinghai-Tibetan Plateau

Selective recovery of lithium from simulated brine using different organic synergist

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Chinese Journal of Chemical Engineering 2019年第2期27卷 335-340页

作者： Huifang Li Lijuan Li Xiaowu Peng Lianmin Ji Wu Li Key Laboratory of Comprehensive and Highly Efficient Utilization of salt Lake Resources Qinghai Institute of Salt Lakes Chinese Academy of Sciences Key Laboratory of salt Lake Resources Chemistry of qinghai Province University of Chinese Academy of Sciences qinghai University

The organic synergists, including Octanol, ethyl acetate(EA), butyl acetate(BA), methyl isobutyl ketone(MIBK),diisobutyl ketone(DIBK), N,N-bis(2-ethylhexyl) acetamide(N523) and 8-hydroxylquiolate, were added to the TBP–FeCl_3 extraction system to extract lithium from brine. The effects of concentration of organic synergist and total organic extractant, molar ratio of Fe/Li, phase ratio, counter-current extraction and the acidity of stripping agent on lithium extraction were investigated to optimize the extraction conditions. Under the optimize conditions, the results of counter-current extraction showed the mixed extraction system was the preponderance on the lithium extraction. Especially the separation of lithium in organic phase and aqueous phase and the separation mass ratio of Mg/Li increased greatly. An extraction mechanism was proposed based on the analysis of FT-IR spectra and Raman spectra.

关键词： Organic synergist Lithium extraction Mixed extraction system Mechanism

Measured and Predicted Solubility Phase Diagrams of Quaternary Systems LiBr-NaBr-MgBr2-H2O and LiBr-KBr-MgBr2-H2O at 298.15 K

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Chemical Research in Chinese Universities 2020年第6期36卷 1234-1240页

作者： CUI Ruizhi LI Wu DONG Yaping LI Jun Key Laboratory of Comprehensive and Highly Ejficient Utilization of salt Lake Resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008P.R.China Key Laboratory of salt Lake Resources Chemistry of qinghai Province Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008P.R.China qinghai Engineering and Technology Research Center of Comprehensive Utilization of salt Lake Resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008P.R.China

The stable phase equilibria of quaternary systems LiBr-NaBr-MgBrz-H2O and LiBr-KBr-MeBr-HO at 298.15 K were studied by both experimental measurement(isothermal solution saturation method)and theoretica prediction(Pitzer model).The solubilities of the saturated solution have been determined experimentally and two sta ble phase diagrams and relevant water diagrams of the two quaternary systems were *** show that qua ternary system LiBr-NaBr-MgBrz-H2O is hydrateⅡtype as NaBr and NaBr-2H2O *** phase diagran consists of only one invariant point,four univariant curves,and five crystallization *** quaternary system LiBr-KBr-MgBr2-H2O is a complex type as the double salt KBr MgBrz-6H2O *** addition to this double salt the three single salts LiBr-2H2O,KBr and MgBr2:6H2O also *** this paper,the solubilities of phase equilibria in above quaternary systems were also calculated by the Pitzer's electrolyte solution *** the neededparameters can be obtained from the literature or be fitted by experimental *** the Basis of the experimental and alculated results,the phase diagram of the quaternary system was plotted for *** shows that the calculation results are consistent with the experimental ones.

关键词： Brine Solubility Phase diagram Bromide Pitzer's model

Geochemistry of Brines from salt Ore Deposits in Western Tarim Basin

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Chinese Journal Of Geochemistry 2004年第3期23卷 238-244页

作者：马万栋马海州谭红兵董亚萍张西营孙国芳 qinghai institute of salt lakes Chinese Academy of Sciences Xining 810008 China

In the geological evolution of the Tarim Basin, many transgressions and relictions happened. So there have been plentiful sources of salt. Moreover, because of uttermost drought, a lot of salt has been deposited. It is possible to find potash salt in this area. In our fieldwork, we have found salt and brine in western Tarim Basin. Based on a geological survey and the characteristics of sedimentary facies and paleogeography, this paper deals with the geochemical parameters and discusses the possibility of formation of potash salt in terms of the chemical analyses of samples collected from western Tarim Basin. Results of brine analysis lead to some conclusions: most of these salt brines have eluviated from very thick halite beds, mainly chloride-type salt and this kind of halite does not reach the stage of potash deposition in all aspects; WKSL (Wukeshalu) occupies a noticeable place, and we should attach importance to this district because there have been some indicators of the occurrence of potash deposits as viewed from the contents of Br and K. Finally, low Br contents are recognized in the Tarim Basin as a result of salt aggradation, and this point of view has been proved by the results of this experiment and the data available. It cannot depend upon the index of Br to judge the evolution stage of halite. We must look for other facies of potash except marine facies.

关键词：塔里木盆地西部地球化学碳酸钾盐湖