摘要
水溶开采是目前井盐开采的主要手段,了解石盐的水溶性能对掌控盐矿开采效率和预测溶腔形态发 育至关重要.本研究对束鹿凹陷古近系沙河街组石盐样品进行了水溶性能研究,发现随着卤水浓度的增高,石 盐样品的侧溶溶蚀速率从7-8 mm/h降低到1-2 mm/h,侧溶角从9°增加到34°溶液中NaCl含量呈线性趋势 显著增加,从 50 g/L到 320 g /L,而CaSO4含量始终保持在基线附近.超过77%溶解残渣的粒径小于2mm,该部 分残渣沉降速率随着卤水浓度的增高逐渐降低,从 2.8cm/s到 2.0cm/s,但是整体沉降速率较小.根据上述实验 结果,我们认为在该盐矿开采初期,应向井筒内注入淡水,加快溶腔形成;在正常开采阶段和开采后期,可向井 筒内注入低浓度卤水,既可保证溶解速率,又可以使溶解残渣尽快排出,保证盐矿开采可持续进行.
Dissolution mining is the main production means for well salt. Understanding the solubility property of halite is of great importance to control mining efficiency and to predict the shape of salt cavern. We conducted dissolution experiment of the halite of Paloegene Shahejie Formation, Shulu Sag. The results show along with the rise of baume degrees of the brine, the lateral dissolution rates decline gradually, from 7-8 mm/h to 1-2 mm/h and the lateral dissolution angles increase gradually too, from 9° to 34°. The contents of NaCl of the brine increases linearly, from 50 g/L to 320 g/L, while the contents of the CaSO 4 of the brine stay around the base line. About 77-100% of the dissolution residues are smaller than 2 mm and the sinking rates of these fine residues are very slow, from 2.8 cm/s to 2.0 cm/s. These results indicate in the early stage of mining, we should inject fresh water to accelerate the forming of cavern and in the late stage of mining, we should inject brine of low concentration, which will maintain high dissolution rates and discharge residues timely. This will guarantee the long-term continuous production of the salt mine.
出处
《中国井矿盐》
CAS
2016年第5期17-19,23,共4页
China Well and Rock Salt
关键词
束鹿凹陷
古近系沙河街组
石盐水溶性能
Shulu sag, palaeogene shahejie formation, dissolution of halite
