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铀石系与沥青铀矿密切共生的原生矿,广泛出现于印支期后较年轻的热液脉型和各种砂岩型铀矿床中。铀石的这种产出特点,虽然是由成因所决定的。为提高认识和深入找矿,对其形成机制实有探讨之必要。铀石系铀的硅酸盐,其形成机制离不开铀和硅酸的活度、迁移和沉淀的物化条件。石英和非晶质二氧化硅都能溶于水形成硅酸。在25℃、1个大气压的标准状态下,非晶质二氧化硅在水中的平均溶解度为120PPM,而石英为 6PPM。由于花岗岩和砂岩中的硅主要为石英,故只把石英在水中的溶解度作为硅酸的活度进行研究。据肯尼迪资料(1950),石英的溶解度与压力、温度和PH值有关。在水温>374.2℃
Uranium is closely related with the uranium pit coal mine, occurring extensively in later Indosinian hydrothermal veins and various sandstone-type uranium deposits. This output characteristic of uranium, though determined by causes. In order to raise awareness and deepen the prospecting, it is necessary to discuss its formation mechanism. Uranium uranium silicate, its formation mechanism can not be separated uranium and silicate activity, migration and precipitation of physical and chemical conditions. Both quartz and amorphous silica dissolve in water to form silicic acid. Amorphous silica has an average solubility of 120 ppm in water and 6 ppm of quartz at 25 ° C under 1 atmosphere of normal pressure. Since the silicon in granite and sandstone is mainly quartz, only the solubility of quartz in water is examined as the activity of silicic acid. According to Kennedy’s data (1950), the solubility of quartz is related to pressure, temperature and pH. At water temperature> 374.2 ℃