铀钼共生矿加压碱法浸出试验

Pressure Alkali Leaching Test of Uranium-Molybdenum Symbiotic Ores

针对某低品位铀钼伴生矿复杂矿性的特点,开展了加压碱法浸出试验,分析了难处理铀钼伴生矿加压碱法浸出的主要反应原理及反应机理,查明了浸出的主要难点是硫化物包裹体中钼的有效浸出以及胶硫钼矿的有效破解溶解和氧化。试验结果表明,在矿石粒度-0.147 mm、总压0.7 MPa(氧分压0.5 MPa)、碱总用量16%(碳酸氢钠4%、碳酸钠12%)、反应温度110℃、浸出液固比1.5、反应时间3 h的条件下,尾渣中铀和钼的品位分别降至0.009%和0.125%以下,浸出率分别达到89.77%、84.62%以上。解决了包裹型难处理硫化钼的高效分解的难题,实现了铀、钼金属的高效回收,为该类型矿石处理提供了技术路线选择的依据。

Address to the complex characteristics of a low-grade uranium-molybdenum associated ore,the pressure alkali leaching experiment was conducted to analyze the main reaction principles and mechanisms of pressure alkali leaching of refractory uranium-molybdenum associated ore.The main difficulties in leaching were identified as the effective leaching of molybdenum in sulfide inclusions,as well as the effective dissolution and oxidation of colloidal sulfur molybdenum ore.The experimental results show that the grades of uranium and molybdenum in the tailings drop to 0.009%and 0.125%below respectively,and the leaching rate is 89.77%and 84.62%respectively,under the conditions of ore particle size of-0.147 mm,total pressure of 0.7 MPa(oxygen partial pressure of 0.5 MPa),total alkali dosage of 16%(sodium bicarbonate 4%,sodium carbonate 12%),ratio of liquid to solid of 1.5,reaction temperature of 110℃,and reaction time of 3 h.It solves the problem of high efficiency decomposition of refractory molybdenum sulfide,realizes the high efficiency recovery of uranium and molybdenum metals,and provides the basis for the selection of technical route for the treatment of this type of ore.