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这是一个沉积岩类型铀矿床。我们完成了四种不同岩性的单矿样的浸出行为的研究。这四种矿样是:(1)含有机质凝灰质砾岩;(2)凝灰质含砾砂岩;(3)泥质粉砂岩;(4)凝灰岩。利用电子探针及X射线衍射提供了一个有效的方法,研究了主要矿物组成及铀的赋存状 态。研究结果为浸出工艺提供参数。使用浸出条件是:液固比1:1,温度60℃,时间3小时,粒度—32目,NaClO_3加入量0.3%,浸出剂硫酸。一系列实验表明、前三种矿样在硫酸用量分别为12%、12%、8%时,铀的浸出率均接近90%;而凝灰岩在用酸量为6％时浸出率仅60%,细磨或用硝酸作浸出剂能提高铀的浸出率。如果提高浸出液中剩余酸浓度、前三种矿样渣含铀量会降低,而凝灰岩作用不大。实验证实,各岩性中耗酸矿物主要是碳酸盐矿的方解石、石云石等,凝灰岩含耗酸矿物少。
This is a sedimentary rock type uranium deposit. We have completed the study of the leaching behavior of four different lithologies of single ore samples. The four mineral samples are: (1) organic tuffaceous conglomerate; (2) tuffaceous pebbly sandstone; (3) argillaceous siltstone; (4) tuff. Using electron probe and X-ray diffraction provides an effective method to study the main mineral composition and uranium occurrence state. The results provide parameters for the leaching process. Leaching conditions are: liquid to solid ratio of 1: 1, temperature 60 ℃, time 3 hours, particle size -32 mesh, NaClO_3 added 0.3% leaching agent sulfuric acid. A series of experiments show that the leaching rates of uranium are close to 90% when the amount of sulfuric acid is 12%, 12% and 8%, respectively; while the leaching rate of the tuff is only 60% when the amount of acid is 6% Fine grinding or nitric acid as a leaching agent can increase the leaching rate of uranium. If you increase the leachate residual acid concentration, the first three ore samples containing uranium will reduce the amount of, and the role of tuff is not. Experiments confirmed that the acid-consuming minerals in various lithologies are mainly calcite, dolomite and other carbonate minerals, tufa containing less acid minerals.