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用等温溶解平衡法研究了盐湖卤水体系Li+,Na+,K+,Mg2+/SO_4 ̄2-H2O25℃溶解度,获得了该五元体系25℃溶解度相图的十个无变量点和十个结晶区.十个结晶区分别对应于原始组份K2SO4、Li2SO4·H2O、MgSO4·7H2O、Na2SO4·10H2O、复盐3K2SO4·Na2SO4、Na2SO4·MgSO4·4H2O、Li2SO4·3Na2SO4·12H2O、2Li2SO4·Na2SO4·K2SO4·Li2SO4·K2SO4和K2SO4·MgSO4·6H2O,此外没有产生新的复盐或固溶体,用现代电解质溶液理论-Pitzer模型校验该体系的溶解度测定值,结果令人满意. 相似文献
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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
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
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盐湖卤水体系Li~+,Mg~(2+)/Cl~-,SO_4~(2-),borate 总被引:1,自引:0,他引:1
本文总结了作者对盐卤硼酸盐体系Li+,Mg2+/Cl-,SO42-,B4O7(2-)-H2O研究的结果,对该体系涉及的硼酸盐的合成、鉴定和性质进行了研究,并对这些盐在纯水及一些盐溶液中的存在形式进行了初步探索.完成了该体系所包含的一些次级体系的相平衡及溶液物化性质的研究.提出了一种镁硼酸盐Mg2B6O(11)·17H2O的新合成方法.首次发现三方硼镁石在水中的相转化是分两个阶段进行,从而证明了尼古拉耶夫在25℃MgO—B2O3-H2O体系研究中三方硼镁石与章氏硼镁石的共饱点,实际上是三方硼镁石向多水硼镁石发生相转化的一个动力学的平衡点,热力学的个稳点的观点. 相似文献
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本文研究了三元体系MgSO4—CH3CONHCONH2—H2O(Ⅰ)和Mg(NO3)2─CH3CONHCONH2—H2O(Ⅱ)在30℃的相平衡,测定了饱和溶液溶解度及其折光指数,绘制了相应的溶度图和折光指数─组成关系图。两个体系均为简单共饱型。溶度曲线及折光指数曲线均由两支组成,分别与MgSO4·7H2O(Ⅰ)或Mg(NO2)2·6H2O(Ⅱ)和CH2CONHCONH2相对应。共饱点的组成分别为(Ⅰ)中MgSo427.35%,CH3CONHCONH2 4.7%;(Ⅰ)中Mg(NO3)242.75%,CH3CONHCONH212.24%。这项工作对开发缓释肥料具有重要意义。 相似文献
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本文测定了三元系RECl3(RE=La,Pr,Sm)-HOAc-H2O(30℃)的平衡态的溶度数据并绘制了相应的溶度图.在三个体系中分别形成LaCl3·7H2O,PrCl3·6H2O,SmCl3·6H2O三种物质.HOAc对LsCl3·7H2O,PrCl3·6H2O,SmCl3·6H2O盐析作用程度的不同,表明了轻稀土元素的“一分组效应”,同时依据HOAc对LaCl3·7H2O,PrCl3·6H2O,SmCl3·6H2O有盐折作用这一结论,提出了一种制备LaCl3·7H2O,PrCl3·6H2O,SmCl3·6H2O的新方法. 相似文献
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通过对盐湖湖区土壤调查,在对区域水文地质资料进行分析的基础上,认为在大柴旦地区建造日晒池,利用太阳能进行日晒卤水,分离一般盐类是经济可行的.制取高含硼和锂盐的氯化镁饱和卤水,供盐酸酸化分离硼酸,最后提取锂盐. 相似文献
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大柴旦盐湖夏季组成卤水的天然蒸发(含硼海水型盐湖卤水的天然蒸发) 总被引:2,自引:2,他引:2
在进行大集里盐湖夏季组成卤水的天然蒸发实验中确定,该卤水的蒸发结晶路线不是按照Na+、K+、Mg(2+)//C1-、SO4(2-)──H2O体系25℃平衡溶解度相图,而是按照该体系的介稳相图预示的亚稳过程进行。从天然蒸发过程中盐卤的浓缩倍数与浓缩卤水中硼富集倍数的一致性认为,盐卤在天然蒸发浓缩业折过程中硼酸盐一般地并不以固体业形式析出,而是赋存于浓缩卤水中。 相似文献
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盐湖卤水是一种宝贵的无机盐资源,其中除富含钾、钠、镁、硼外,一些高价值的稀有元素锂、铷、铯、碘也有较大的储量,稀有元素的开发利用对于盐湖资源的综合利用和可持续发展具有重要意义。本文主要针对近年来盐湖资源中锂、铷、铯、碘等稀有元素吸附分离材料和相关技术的研究进行分析总结,资料以卤水中或以在卤水中的应用为目的的研究为主,对吸附材料制备、吸附机理及存在问题等情况进行归纳,以期为盐湖稀有元素分离提供参考,为盐湖资源的综合利用提供指导。 相似文献
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采用分子动力学模拟,研究了西藏拉果错盐湖卤水中阴、阳离子以及水分子间的相互作用行为。以盐湖卤水等温蒸发过程中粒子浓度变化的四个阶段为研究对象,分别计算了不同体系的扩散系数、配位数、均方位移和径向分布函数。计算结果表明,液相浓度越低时,H2O分子对各离子之间的相互作用有抑制作用,液相中离子浓度越高时,SO42-易与CO32-竞争Li+形成离子对,从而影响盐湖卤水中Li+的富集。本文研究结果对盐湖卤水中Li+的迁移行为作出了机理解释,为盐湖卤水提锂的发展奠定了理论基础。 相似文献
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Boron resources are abundant in Da Qaidam salt lake of Qaidamu Basin. It has been given great attention for the polyborate species present in brine. In this study, the Raman spectroscopy was applied to investigate the existing-form of boron in brine during evaporation. The prepared solutions of MgO·2B2O3-H2O, MgO·2B2O3-MgCl2 -H2O, and MgO·2B2O3-MgSO4-H2O was also evaporated and recorded to study the influence of boron concentration, pH, and electrolytes on the borate speciation in brine. The mononborates of B(OH)3 and B(OH)4- were found to be the only forms present in the original salt lake brine. Brine evaporation promotes the formation of polyborate anions B3O3(OH)4-, B5O6(OH)4-, and B6O7(OH)62- and also disappearance of the B(OH)4- ion in brine with boron concentration of more than 11 g/L in B2O3. The pentaborate ion of B5O6(OH)4- was sensitive to the solution pH and found to be appeared under the pH value of 8.0. While the hexaborate ion of B6O7(OH)62- was observed more dependent on the electrolyte of magnesium chloride due to its special properties, such as promoting boron accumulation, lowering solution pH, and also the strong af?nity for water molecules, which is beneficial to the polymerization of borate ions in brine. The interaction mechanisms among polyborate anions during evaporation had also been proposed. 相似文献
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采用分子动力学模拟,研究了西藏拉果错盐湖卤水中阴、阳离子以及水分子间的相互作用行为。以盐湖卤水等温蒸发过程中粒子浓度变化的四个阶段为研究对象,分别计算了不同体系的扩散系数、配位数、均方位移和径向分布函数。计算结果表明,液相浓度越低时,H2O分子对各离子之间的相互作用有抑制作用,液相中离子浓度越高时,SO42-易与CO32-竞争Li+形成离子对,从而影响盐湖卤水中Li+的富集。本文研究结果对盐湖卤水中Li+的迁移行为作出了机理解释,为盐湖卤水提锂的发展奠定了理论基础。 相似文献
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Boron resources are abundant in the Da Qaidam Salt Lake of the Qaidamu basin in China,which has generated significant attention due to the presence of polyborate species in brine from this lake. In this study,Raman spectroscopy was used to investigate the existing form of boron in brine during evaporation. MgO·2 B_2 O_3-H_2 O,MgO·2 B_2 O_3-MgCl_2-H_2 O,and MgO·2 B_2 O_3-MgSO_4~-H_2 O solutions were also studied to determine the influence of boron concentration,pH,and electrolytes on the borate speciation from brine. The mononborates B( OH)_3 and B( OH)_4~-were found to be the only forms present in natural salt lake brine. Brine evaporation promoted the formation of the polyborate anions B_3 O_3( OH)_4~-,B_5 O_6( OH)_4~-,and B_6 O_7( OH)_6~(2-)and also promoted the disappearance of the B( OH)_4~-ion from brine at boron concentrations of more than 11 g/L B_2 O_3. The pentaborate ion B_5 O_6( OH)_4~-was sensitive to the solution pH and appeared only at p H values less than 8. 0. Meanwhile,the hexaborate ion B_6 O_7( OH)_6~(2-)was observed to be more dependent on the electrolyte magnesium chloride due to its special properties,such as promoting boron accumulation,lowering solution pH,and also its strong affinity for water molecules,which were all beneficial for the polymerization of borate ions in brine. Interaction mechanisms between polyborate anions during evaporation are also proposed herein. ake; evaporation; polyborate species; interaction mechanism. 相似文献