| 柴西砂砾型卤水蒸发过程中钾的富集行为及提取技术研究 |
| 投稿时间：2024-10-23 修订日期：2025-01-08 |
| 关键词:gravel type, underground brine, potash, enrichment behavior, technology |
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| 摘要: |
| Studies on the enrichment behavior of potassium during evaporation of gravel brines in western Tsaidam and extraction technique |
| In recent years, gravel-type underground brines have been found in the western part of the Qaidam Basin, and the reserves of potassium-rich brine are huge. In this paper, the enrichment behavior and salt precipitation law of potassium during the evaporation of potassium-rich brine in Heibei Depression were investigated by means of salt field evaporation, and it was found that the evaporation process of brine basically followed the phase diagram of the four-member aqueous-salt system of Na+, K+, Mg2+//Cl--H2O, and potassium could be enriched from 0.2 to 1.8 % in the liquid phase, and the potassium minerals in the potassium salt precipitation section were mainly carnallite, which was of the normal carnallite type. Utilizing potash ore extracted from a test salt field as the primary material, research was conducted on potassium extraction technology using the cold decomposition-flotation method. Experiments were carried out on decomposition water volume, flotation processes, and expanded closed-circuit flotation. With a ratio of 2:5 between the mass of decomposition water and carnallite ore, and the use of capture agent ZMC at a dosage of (120+60)g/t, concentrate product of 50kg with KCl grade of 91.20% was obtained. This product met the requirements of the national superior grade index for agricultural use of potassium chloride. The study results indicate that the gravel-type underground brine in the western part of the Qaidam Basin holds promise to serve as a potential backup base for potassium salt resources in China. |
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