| 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 |
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| 关键词:gravel type underground brine potash enrichment behavior extraction technology |
| 基金项目:中国地质调查局地质调查项目“柴达木盆地北部大浪滩-黑北凹地深层卤水钾盐资源调查评价”(编号: DD20230755); “西部地区钾盐矿产远景调查评价”(编号: DD20160054) |
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| A Study on the Enrichment Behavior of Potassium during Evaporation of Gravel Brines in Western Tsaidam and the Extraction Technique |
| In recent years, gravel-type underground brines with large reserves of potassium-rich brine have been reported in the western part of the Qaidam Basin. In this study, the enrichment behavior and salt precipitation law of potassium during the evaporation of potassium-rich brine in the Heibei Depression were investigated using salt field evaporation. The evaporation process of brine followed the phase diagram of the four-member aqueous-salt system of Na+, K+, Mg2+//Cl– -H2O, and potassium was enriched from 0.2% to 1.8% in the liquid phase. The potassium minerals in the potassium salt precipitation section included primarily the normal carnallite type. Using 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. The decomposition water volume, flotation processes, and expanded closed-circuit flotation were analyzed experimentally. 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, a concentrated product of 50 kg with a KCl grade of 91.20% was obtained. This product met the requirements of the National Superior Grade Index for the agricultural use of potassium chloride. These results indicate that the gravel-type underground brine in the western part of the Qaidam Basin is a promising potential backup base for potassium salt resources in China. |
| WANG Yunsheng,NIE Zhen,BU Lingzhong,YU Jiangjiang,WU Qian,DING Tao.2025.A Study on the Enrichment Behavior of Potassium during Evaporation of Gravel Brines in Western Tsaidam and the Extraction Technique[J].Acta Geoscientica Sinica,46(4):869-874. |
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