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本文在野外观察取样的基础上建立实验模型并完成 6组铀、钼、硒的溶解和还原实验 ,取得了179个分析数据。实验结果表明 ,形成层间氧化带强氧化的溶液为酸性含氧溶液。铀沉淀的主要因素是溶液 pH值的改变、CH4 等气体还原及溶液中SO2 - 4与HCO- 3浓度比值的变化。硒与铀、钼不同 ,可在氧化亚带中沉淀。实验还证明 ,512矿床初始含铀溶液为富钠的酸性溶液 ,它在强氧化亚带内“驱赶钙 (及铀、钼、硒 ) ,保留硅、铁”作用明显。形成卷状矿体时 ,溶液由酸性变为中 弱碱性 ,硒、铀、钼依次沉淀形成分带性。
Based on field observation and sampling, this paper established an experimental model and completed six groups of uranium, molybdenum, selenium dissolution and reduction experiments, obtained 179 analytical data. The experimental results show that the solution that forms strong oxidation of interlayer oxidation zone is acidic oxygen solution. The main factors of uranium precipitation are the change of solution pH, the reduction of CH4 gas and the ratio of SO2 - 4 to HCO - 3 concentration in solution. Selenium and uranium, molybdenum is different, can precipitate in the oxidation zone. The experiment also proves that the initial uranium solution in the 512 deposit is an acidic solution rich in sodium, which has the obvious function of “driving out calcium (and uranium, molybdenum and selenium) and retaining silicon and iron” in the strong oxidation zone. The formation of a roll of ore body, the solution from weak to alkaline alkalinity, selenium, uranium, molybdenum followed by precipitation to form zonation.