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自然地理   2篇
  2019年   2篇
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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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为探究南翼山油田水中NH_4Cl对H_3BO_3低温介稳区性质的影响,采用浊度法测量了253.15 K~303.15 K温度范围不同浓度的NH_4Cl对CaCl_2溶液中硼酸的溶解度影响和介稳区宽度;依次根据Nyvlt自洽方程理论求得成核级数m、经典三维成核理论求得固—液界面能γ,实验结果表明,CaCl_2溶液中的NH_4Cl对H_3BO_3溶解度影响很小;CaCl_2溶液中H_3BO_3的介稳区宽度随着NH_4Cl浓度的增加先变小后变大,氯化铵质量分数在0.12%~1.13%之间存在着一个临界值,此时硼酸的介稳区宽度最小。  相似文献   
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