| 298.15 K下KBr−CaBr2−SrBr2−H2O四元体系相平衡研究 |
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| 引用本文：杨秋叶,崔瑞芝,聂国亮,任红保,李 武.2024.298.15 K下KBr−CaBr2−SrBr2−H2O四元体系相平衡研究[J].地球学报,45(5):791-797. |
| DOI：10.3975/cagsb.2024.081801 |
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| 基金项目:青海省自然科学基金项目(编号: 2024-ZJ-901) |
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| 中文摘要:青海柴达木盆地深部地下卤水中富含大量钾、钙、锶、溴等元素, 是极具综合利用价值的液态矿产资源, 可作为钾盐潜在开发资源。本文根据该地下卤水的组成特点, 采用等温溶解平衡法对四元体系KBr?CaBr2?SrBr2?H2O在298.15 K时溶解度和相平衡规律进行详细的研究。测定该体系各盐在溶液中的溶解度和平衡固相组成, 根据实验结果绘制相应的稳定平衡相图和水含量图。该四元体系在298.15 K下没有复盐和固溶体生成, 其平衡相图中有一个共饱点, 三条单变量曲线, 和三个固相结晶区(KBr、CaBr2?6H2O、SrBr2?6H2O)。基于Pitzer模型, 对该四元体系在298.15 K下的溶解度进行模拟计算, 绘制出计算相图, 计算相图与实验相图基本吻合。 |
| 中文关键词:钾盐 相图 溴化物 卤水矿物体系 深部卤水 |
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| Brine Mineral Equilibrium Studies of a KBr−CaBr2−SrBr2−H2O System at 298.15 K |
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| Abstract:The deep underground brine of Qaidam Basin in Qinghai is rich in potassium, calcium, strontium, bromine and other elements, making it a liquid mineral resource with great comprehensive utilization value. Notably, its brine can be developed as a potential potassium salt resource. In this study, the solubility and phase equilibrium of the quaternary KBr?CaBr2?SrBr2?H2O system at 298.15 K were studied in detail using the isothermal dissolution equilibrium method, based on the compositional characteristics of the deep underground brine. The solubility and equilibrium solid-phase compositions of the relevant salts of this system were determined. Based on the experimental data, a diagram of the stable phase equilibrium and water content of the system at specific temperature conditions has been plotted. This phase diagram has no complex salt and solid solution generation at 298.15 K, has one invariant point, three univariant dissolution curves, and three solid-phase crystalline zones (KBr, CaBr2?6H2O, SrBr2?6H2O). Based on the Pitzer model, the solubility of this quaternary system at 298.15 K was predicted, and its calculated phase diagram agrees well with the experimental phase diagram. |
| keywords:potassium salts phase diagram bromides brine mineral systems deep brines |
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